Difference between revisions of "AY Honors/Hot Air Balloons/Answer Key"

From Pathfinder Wiki
< AY Honors‎ | Hot Air BalloonsAY Honors/Hot Air Balloons/Answer Key
 
m
 
(471 intermediate revisions by more than 100 users not shown)
Line 1: Line 1:
−
[[Image:Jacques Étienne Montgolfier.jpg|thumb|250px|Jacques Étienne Montgolfier]]
+
{{HonorSubpage}}
 +
<section begin="Body" />
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=1}}
 +
<noinclude><translate><!--T:47-->
 +
</noinclude>
 +
<!-- 1. State the role each of the following played in the development of flying balloons. -->
 +
<noinclude></translate></noinclude>
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=1a}}
 +
<noinclude><translate><!--T:48-->
 +
</noinclude>
 +
<gallery>
 +
Image:Josephmontgolfier.jpg|Joseph Michel Montgolfier
 +
Image:Jacques Étienne Montgolfier.jpg|Jacques-Etienne Montgolfier
 +
</gallery>
  
−
{{otheruses}}
+
<!--T:3-->
−
The brothers, '''Joseph Michel Montgolfier''' ([[26 August]] [[1740]] – [[26 June]] [[1810]]) and '''Jacques Étienne Montgolfier'''  ([[6 January]] [[1745]] – [[2 August]] [[1799]]), [[inventor|invented]] the '''''montgolfière''''', or [[hot air balloon]]. Their invention was the first aircraft to carry humans into the sky.
+
Joseph-Michel Montgolfier (26 August 1740 – 26 June 1810) and Jacques-Étienne Montgolfier (6 January 1745 – 2 August 1799) were the inventors of the montgolfière, or airship. The brothers succeeded in launching the first manned ascent, carrying a young physician and an audacious army officer into the sky.
  
 +
<!--T:4-->
 +
Of the two brothers, it was Joseph who first contemplated building "machines". Joseph observed laundry drying over a fire incidentally form pockets that billowed upwards. Joseph set about building a box-like chamber {{units|1 by 1 by 1.3 meters|3 by 3 by 4 ft}} out of very thin wood and covering the sides and top with lightweight taffeta cloth. Under the bottom of the box he crumpled and lit some paper. The contraption quickly lifted off its stand and collided with the ceiling. Joseph then recruited his brother to balloon building.
  
 +
<!--T:5-->
 +
The two brothers then set about building a contraption 3 times larger in scale (27 times larger in volume). The lifting force was so great that they lost control of their craft on its very first test flight on 14 December 1782. The device floated nearly 2 kilometres (about 1.2 mi). It was destroyed after landing by the "indiscretion" of passersby.
  
−
call me somtime babe..
+
<!--T:49-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 1a -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=1b}} <!--T:6-->
 +
<noinclude><translate><!--T:50-->
 +
</noinclude>
 +
[[image:Early flight 02562u (4).jpg|thumb|200px|The first untethered balloon flight, by Rozier and the Marquis d'Arlandes on 21 November 1783.]]
 +
Jean-François Pilâtre de Rozier (30 March 1754 – 15 June 1785) was a French chemistry and physics teacher, and one of the first pioneers of aviation. His balloon crashed near Wimereux in the Pas-de-Calais during an attempt to fly across the English Channel, and he and his companion, Pierre Romain, became the first known victims of an air crash.
  
−
==Initial experiments==
+
<!--T:7-->
−
Of the two brothers, it was Joseph who first contemplated building flying machines.
+
In June 1783, he witnessed the first balloon flight of the Montgolfier brothers. On 19 September, he assisted with the untethered flight of a sheep, a cockerel and a duck from the front courtyard of the Palace of Versailles. After a variety of tests in October, he made the first manned free flight in history on 21 November 1783, accompanied by the ambitious Marquis d'Arlandes. During the 25-minute flight using a Montgolfier hot air balloon, they traveled 12 kilometres from the Château de la Muette to the Butte-aux-Cailles, then in the outskirts of Paris, attaining an altitude of 3,000 feet.
 +
{{clear}}
  
−
There is no definitive account of when Joseph first started contemplating lighter-than-air flight. Some accounts put it as early as 1777 when Joseph observed laundry drying over a fire incidentally form pockets that billowed upwards.
+
<!--T:51-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 1b -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=1c}} <!--T:8-->
 +
<noinclude><translate><!--T:52-->
 +
</noinclude>
 +
In December of 1783, these two flew the first gas balloon, filled with hydrogen. This flight lasted for at least 2 hours, starting from the Tuileries gardens in Paris, and landing outside Paris where it was destroyed by terrified peasants.  
  
−
Joseph made his first definitive experiments in November of 1782 while living in [[Avignon]]. He reported, some years later, that he was watching a fire one evening while contemplating one
+
<!--T:9-->
−
of the great military issues of the day -- an assault on the fortress of [[Gibraltar]], which had proved impregnable by both sea and land.  Joseph mused on the possibility of an air assault
+
Charles went on to discover [[w:Charles's_Law| Charles' Law]] which describes the relationship between the density of a gas and its temperature.
−
using troops lifted by the same force that was lifting the embers from the fire. He believed that contained within the smoke was a special gas, called 'Montgolfier Gas', with a special property he called 'levity'.  
 
  
−
As a result of these musings, Joseph set about building a box-like chamber 1 m by 1 m by 1.3 m (3 ft by 3 ft by 4 ft) out of very thin wood and covering the sides and top with lightweight [[taffeta]] cloth. Under the bottom of the box he crumpled and lit some paper.  The contraption quickly lifted off its stand and colided with the ceiling.
+
<!--T:53-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 1c -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=1d}} <!--T:10-->
 +
<noinclude><translate><!--T:54-->
 +
</noinclude>
 +
From 11 August to 17 August, 1978, these three completed the first transatlantic balloon flight in the [[w:Double_Eagle_II|Double Eagle II]]. They began their flight from Presque Isle, Maine and ended their flight at Miserey, France.  
  
−
Joseph then recruited his brother to balloon building by writing the prophetic words: "Get in a supply of taffeta and of cordage, quickly, and you will see one of the most astonishing sights
+
<!--T:11-->
−
in the world."  From that point forward, the brothers worked as a team.
+
Ben Abruzzo and Larry Newman were also pilots on the [[w:Double_Eagle_V|Double Eagle V]] which in 1981 was the first balloon to cross the Pacific Ocean.
  
−
Early in next month, December 1782, Joseph repeated his experiment out of doors in a garden near the family homestead with his entire family as witness.  On this occasion, the box-like balloon lifted to some 20 meters (70 ft) in the air and remained aloft for a full minute.
+
<!--T:55-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 1d -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=1e}} <!--T:12-->
 +
<noinclude><translate><!--T:56-->
 +
</noinclude>
 +
On March 1, 1999, Bertrand Piccard and Brian Jones began the first balloon flight to circumnavigate the earth. Their flight was a success and ended on March 20, 1999. The flight took 19 days and 21 hours. The flight started in Switzerland and ended in Egypt.
  
−
The two brothers then set about building a contraption 3 times larger in scale (27 times larger in volume). The lifting force was so great that they lost control of their craft on its very first test flight on [[14 December]] [[1782]]. The device floated nearly 2 kilometres (about 1.2 mi). It was destroyed after landing by what Etienne later called the "indiscretion" of passersby.
+
<!--T:57-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 1e -->
 +
{{CloseReq}} <!-- 1 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=2}}
 +
<noinclude><translate><!--T:58-->
 +
</noinclude>
 +
<!-- 2. Cite the principle of Archimedes, and briefly describe how it applies to each of the following: -->
 +
::Archimedes' Principle states: ''any body fully or partially submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced.''
 +
<noinclude></translate></noinclude>
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=2a}}
 +
<noinclude><translate><!--T:59-->
 +
</noinclude>
 +
Cork is less dense than water, and weighs less than the volume of water displaced, causing the cork to float.
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 2a -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=2b}}
 +
<noinclude><translate><!--T:60-->
 +
</noinclude>
 +
Ships, though made of dense materials, are shaped so that much of the interior is air. Because the weight of the ship and its cargo is less than the volume of water displaced, the ship will float.
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 2b -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=2c}}
 +
<noinclude><translate><!--T:61-->
 +
</noinclude>
 +
As long as a balloon plus the gas it contains weighs less than the atmospheric air which it displaces, the balloon will float in the air.
  
−
==Public demonstrations==
+
<!--T:62-->
−
Given these initial successes, the brothers decided to make a public demonstration of a balloon in order to establish their claim to its invention.  
+
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 2c -->
 +
{{CloseReq}} <!-- 2 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=3}}
 +
<noinclude><translate><!--T:63-->
 +
</noinclude>
 +
<!-- 3. Using a textbook of Chemistry, or a reference book of scientific tables, draw up a simple table showing the composition of air by weight and by volume. -->
 +
{|border=1 cellspacing=1 cellpadding=5 align="center"
 +
|-
 +
! Gas || Air Percentage || Weight of pure gas
 +
|-
 +
|Nitrogen || 78%|| 1.25 g/liter
 +
|-
 +
|Oxygen ||21%|| 1.43 g/liter
 +
|-
 +
|Argon ||.93%|| 1.78 g/liter
 +
|-
 +
|Carbon Dioxide ||.03%||1.96 g/liter
 +
|-
 +
|Other (including Neon, Helium, <br>Hydrogen, Xenon, & Radon)|| .04%||
 +
|}
  
−
They constructed a globe-shaped balloon (there are no reports as to whether the balloon was plain or decorated) of sackcloth with three thin layers of paper inside. The envelope could contain nearly 790 m<sup>3</sup> (28,000 cubic feet) of air and weighed 225 kg (500 lb).  It was constructed of four pieces (the dome and three lateral bands), and held together by some 1,800 buttons.  A reinforcing "fish net" of cord covered the outside of the envelope.
+
<!--T:15-->
 +
The average weight of air in a balloon can be worked out using rough percentages 80% Nitrogen and 20% oxygen as the make up of air. Atomic weight of Nitrogen is 14. Atomic weight of Oxygen is 16. Nitrogen and Oxygen gases are formed using two atoms. So for a balloon containing one mole (22.4 liters) of air, we can compute its weight:
  
−
[[image:Montgolfier Balloon.JPG|thumb|right|250px|A model of the Montgolfier brothers balloon at the [[London Science Museum]]]]
+
<!--T:16-->
 +
80% x 28 + 30% x 32 = 0.8 x 28 + 0.2 x 32 = 22.4 + 6.4 = 28.8
  
−
On [[4 June]] [[1783]] (many sources incorrectly fix the date as [[5 June]]), they flew this craft as their first public demonstration at Annonay in front of a group of dignitaries from the ''Etats particulars''. Its flight covered 2 km (1.2 mi), lasted 10 minutes, and had an estimated altitude of 1,600 - 2,000 m (5,200 - 6,600 ft).
+
<!--T:17-->
 +
So a balloon with 22.4 liters of air weighs 28.8 grams plus the weight of the balloon.  
  
−
Word of their success quickly reached Paris.  Etienne went to the capital to make further demonstrations and to solidify the brothers' claim to the invention of flight.  Etienne had studied in Paris and was much more at home with the dress and habits of the city. Joseph, given his unkempt appearance and shyness, remained with the family.
+
<!--T:18-->
 +
<!-- See talk page for discussion of this section
  
−
There was an intense competition between the brothers and [[Jacques Alexandre César Charles]] who had already made a public demonstration of a balloon using hydrogen as its lifting gas.
+
<!--T:19-->
 +
To calculate weights of gases. One mole of the gas has a volume of 22.4 liters.
  
−
In collaboration with the successful wallpaper manufacturer, Jean Baptiste Réveillon, Etienne constructed a 37,500 cubic foot envelope of taffeta coated with varnish. The balloon was covered in bright colours and flourishes to distinguish it from the rather plain design of the Charles balloons. The bold design was no doubt the influence of Réveillon, the wallpaper maker.
+
<!--T:20-->
 +
Helium has an atomic weight of 4 g per mole so the weight of 22.4 l = 4 grams. Oxygen as a gas has two Oxygen atoms so the weight is twice the atomic weight.
 +
-->
  
−
There was some concern about the effects of flight into the upper
+
<!--T:64-->
−
atmosphere on living creatures. Some reports say King [[Louis XVI of France]] forbade human flight until the effects on animals had been determined.  However, there is no written evidence of this edict.  Rather it is most likely that the inventors themselves decided to send animals aloft first.  
+
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 3 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=4}}
 +
<noinclude><translate><!--T:65-->
 +
</noinclude>
 +
<!-- 4. Draw up a simple table showing a comparison of the atomic number, atomic weight, and density of hydrogen, helium, nitrogen, and oxygen. -->
  
−
On [[19 September]] [[1783]] the ''Aerostat Réveillon'' (as Etienne referred to it) was flown with the first living beings in a basket attached to the balloon: a sheep, a duck and a rooster. This demonstration was performed before a huge crowd at the royal palace in [[Versailles]], before King [[Louis XVI of France]] and Queen [[Marie Antoinette]].
 
  
−
The flight lasted approximately 8 minutes, covered 2 miles, and obtained an altitude of about 1500 feet. The flight would have been longer but the craft was unstable. It tipped wildly just after launch which allowed a considerable amount of hot air to spill from the mouth. The animals survived the trip unharmed.
+
<!--T:22-->
 +
{|border=1 cellpadding=5 align="center"
 +
|-
 +
!
 +
![[w:Atomic_number|Atomic Number]]
 +
![[w:Atomic_weight|Atomic Weight]]
 +
![[w:Density|Density]] (g/cm³)
 +
|-
 +
![[w:Hydrogen|Hydrogen]]
 +
!1
 +
!1.008
 +
!align="left"|0.00008988
 +
|-
 +
![[w:Helium|Helium]]
 +
!2
 +
!4.003
 +
!align="left"|0.0001785
 +
|-
 +
![[w:Nitrogen|Nitrogen]]
 +
!7
 +
!14.01
 +
!align="left"|0.0012506
 +
|-
 +
![[w:Oxygen|Oxygen]]
 +
!8
 +
!16.00
 +
!align="left"|0.001429
 +
|}
  
−
One of the first people at the site of the landing was
+
<!--T:66-->
−
[[Pilâtre de Rozier]] who had already volunteered to be one
+
<noinclude></translate></noinclude>
−
of the first humans aloft when the time came. (Pierre Montgolfier, father of the inventive brothers, had given his permission for his sons to work on balloons rather than the family papermaking business only on the condition that neither of the brothers ever go aloft in a balloon themselves.)
+
{{CloseReq}} <!-- 4 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=5}}
 +
<noinclude><translate><!--T:67-->
 +
</noinclude>
 +
<!-- 5. Name two gases that are used in flying gas filled balloons. -->
 +
Hydrogen & Helium are both less dense than air and may be used when flying a balloon. Warm air is also used for flying balloons, since it is less dense than cold air.
  
−
==Human flight==
+
<!--T:24-->
−
With the successful demonstration at Versailles, and again in collaboration with Réveillon, Etienne started construction of a 60,000 cubic foot balloon for the purpose of making flights with humans. (Etienne's excursion, albeit tethered was the cause of much paternal consternation as he had promised his father that he would not ride in a balloon himself.) The craft was once again decorated with flourishes and was 75 feet tall and 46 feet in diameter.
+
*Note: Hydrogen burns violently when ignited. After the destruction of the Hindenburg, hydrogen was largely abandoned for the flying of manned balloons.
  
−
The balloon was tested in tethered flights later in [[1783]] on [[15 October|15]], [[17 October|17]] and [[19 October]]. At different times, Etienne and [[Pilâtre de Rozier]] on board.  On occasion, these tethered flights reached the limits of the 324 foot long retaining ropes.
+
<!--T:68-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 5 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=6}}
 +
<noinclude><translate><!--T:69-->
 +
</noinclude>
 +
<!-- 6. Explain how heat/temperature affect the density of air, and how this applies to flying hot air balloons. -->
 +
As described by [[w:Charles's_Law|Charles' Law]], heat applied to a gas will cause its molecules to move farther apart, reducing it's density. When the air in a balloon is heated above the temperature of the surrounding air, the air in the balloon becomes less dense than the air outside the balloon. Because the balloon is less dense, it will float or rise. The greater the difference in temperature between the air in the balloon and the surrounding air, the greater the difference in density between the air inside and outside the balloon, which increases the lift that the balloon will generate. This explains why balloons are mostly launched in cooler weather.
  
−
On [[21 November]] [[1783]], the first free flight by humans was made by [[Pilâtre de Rozier]] and the [[marquis d'Arlandes]], who flew aloft for 25 minutes about 100 metres above [[Paris]] for a distance of nine kilometres.  The flight began in the courtyard of the [[Château de la Muette]] in the western outskirts of Paris and landed between the windmills on the [[Butte-aux-Cailles]]. Enough fuel remained on board at the end of the flight to have allowed the balloon to fly four to five times as far.  However, burning embers from the fire were scorching the balloon fabric and had to be daubed out with sponges.  Thus the pilots decided to land as soon as they were over open countryside.
+
<!--T:70-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 6 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=7}}
 +
<noinclude><translate><!--T:71-->
 +
</noinclude>
 +
<!-- 7. Explain the role of each of the following in the structure and flying of a hot air balloon. -->
 +
; a. Envelope: The outer skin of the balloon, forming the container that holds the gas.
 +
; b. Support structure: The framework of larger balloons.
 +
; c. Throat: The lower opening through which the hot flame is applied to heat the air.
 +
; d. Fuel source: The fuel used to heat the air to make the balloon less dense than the surrounding air.
  
−
The ascensions made a sensation. Numerous engravings commemorated the events. Chairs were designed with balloon backs, and mantel clocks were produced in enamel and gilt-bronze replicas set with a dial in the balloon.
+
<!--T:72-->
−
Less affluent Frenchmen could buy crockery decorated with naive pictures of balloons.
+
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 7 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=8}}
 +
<noinclude><translate><!--T:73-->
 +
</noinclude>
 +
<!-- 8. Name two materials that may be used for the envelope of a hot air balloon, and compare the advantages each accords because of its properties. -->
 +
;Paper: Paper may be used for model hot air balloons because of ease of acquisition and low price.
 +
;Plastic: Plastic may be used for model hot air balloons because it is water resistant, easy to work with, and easy to acquire.
 +
;Fabric: Fabric is usually used for larger, manned balloons. The fabric is specially treated.
  
−
==Following years==
+
<!--T:74-->
−
Only one of the brothers (which one is unknown) ever flew in a balloon himself, and only once.
+
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 8 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=9}}
 +
<noinclude><translate><!--T:75-->
 +
</noinclude>
 +
<!-- 9. Describe how flying balloons have served a useful function in -->
 +
<noinclude></translate></noinclude>
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=9a}}
 +
<noinclude><translate><!--T:76-->
 +
</noinclude>
 +
Military uses include: “eyes in the sky”, observation of enemy troops and positions, delivery of explosives to enemy positions, and defensive use of entangling incoming enemy flying craft.
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 9a -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=9b}}
 +
<noinclude><translate><!--T:77-->
 +
</noinclude>
 +
Scientific uses include instrument transport for data collecting, atmospheric studies, and aerial photography.
  
−
In 1766, the British scientist [[Henry Cavendish]] had discovered hydrogen gas, by adding sulphuric acid to iron, tin, or zinc shavings. The development of [[gas balloon]]s proceeded almost in parallel with the work of the Montgolfiers.  This work was led by Messr. Charles. Work on each type of balloon was spurred on by the knowledge that there was a competing group and alternative technology.
+
<!--T:78-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 9b -->
 +
{{CloseReq}} <!-- 9 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=10}}
 +
<noinclude><translate><!--T:79-->
 +
</noinclude>
 +
<!-- 10. At what time of the day do most sport balloon flights take place? Why? -->
 +
Early morning is best because the air has cooled over night making the difference of temperature inside & outside greater, thus increasing buoyancy.
  
−
For a variety of reasons, including the fact that the French government chose to put a proponent of hydrogen in charge of balloon development, [[hot air balloon]]s were superseded by [[hydrogen]] gas balloons.
+
<!--T:80-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 10 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=11}}
 +
<noinclude><translate><!--T:81-->
 +
</noinclude>
 +
<!-- 11. Describe how a pilot controls the vertical movement of -->
 +
<noinclude></translate></noinclude>
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=11a}}
 +
<noinclude><translate><!--T:82-->
 +
</noinclude>
 +
The pilot controls the vertical movement of a hot air balloon by burning more fuel to make the air in the balloon hotter, causes the air in the balloon to become less dense, making it rise. Conversely, turning off the flame and allowing the air in the balloon to cool renders the air in the balloon more dense with respect to the surrounding atmosphere, causing the balloon to descend. More rapid increases in altitude can be achieved by lessening the weight of the balloon usually by dropping ballast, however this is limited by the amount of ballast available.
  
−
Hydrogen balloons became the predominant technology for the next 180 years.  They were used for all major ballooning accomplishments such as the crossing of the English Channel on [[7 January]] [[1785]], by [[Jean-Pierre Blanchard]] and John Jeffries.
+
<!--T:83-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 11a -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=11b}} <!--T:31-->
 +
<noinclude><translate><!--T:84-->
 +
</noinclude>
 +
Adding more of the lighter than air gas to ascend, and spilling some of the gas in order to descend varies the altitude of a helium or hydrogen filled balloon.
  
−
==Revival of the hot air balloon==
+
<!--T:85-->
−
Balloons using heated air rather than lighter-than-air gasses did not return until the [[1960s]], when [[Ed Yost]] improved the safety of the classic Montgolfier design by using [[ripstop nylon]] for the envelope and [[propane]] gas as the burner fuel.
+
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 11b -->
 +
{{CloseReq}} <!-- 11 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=12}}
 +
<noinclude><translate><!--T:86-->
 +
</noinclude>
 +
<!-- 12. Describe how a pilot controls the lateral or horizontal movement of a flying balloon. -->
 +
Horizontal movement of a gas filled flying balloon is entirely at the mercy of air currents. The pilot can only vary the altitude so as to get into the path of air currents, such as the jet stream. This involves careful study of charts of air currents, close attention to weather data, and a certain element of trial and error. Older airships, like the Hindenburg, had a rudder and propellers to move it so that it did not have to depend on air currents.
  
−
==See also==
+
<!--T:87-->
−
[[Les Neuf Sœurs]]
+
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 12 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=13}}
 +
<noinclude><translate></noinclude>
 +
<!-- 13. Build to completion one model hot air balloon ( or two if working in pairs ). -->
 +
===Materials=== <!--T:88-->
 +
* Tissue paper
 +
* Scissors
 +
* Glue Stick(s)
 +
* Sewing pins (optional)
 +
* Thin wire (22 gauge is suggested)
 +
* Needle-nose pliers & wire cutters
 +
* 1 50"x20" piece of Linoleum (for making balloon panel form)
 +
* A spool of string
  
−
==External links==
+
===Directions for balloon panel form=== <!--T:34-->
−
*[http://www.chm.bris.ac.uk/webprojects2003/hetherington/final/montgolfier_bros.html "Lighter than air: the Montgolfier brothers"]
+
[[image:AYHAB-Model-Hot-Air-Balloons-draw2.png|thumb|400px|Illustration of distance from center]]
−
*[http://www.start-flying.com/Montgolfier.htm "Balloons and the Montgolfier brothers"]
 
  
−
[[Category:Balloonists]]
+
<!--T:35-->
−
[[Category:French people]]
+
Use a rigid or semi-rigid material such as poster board or a piece of linoleum flooring. I would suggest a piece of linoleum flooring,as it is more rigid and can be used more times. Cut out a piece that is 50 inches long and 20 inches wide. For every other measurement, you will have to measure from the center of the form you are creating. You will need to mark each measurement on the outside edge (furthest from the center of the form).
−
[[Category:Sibling duos]]
 
−
[[Category:People of the Industrial Revolution|Montgolfier Brothers]]
 
−
[[Category:Aviation pioneers|Montgolfier Brothers]]
 
−
[[Category:1740 births]]
 
−
[[Category:1745 births]]
 
−
[[Category:1799 deaths]]
 
−
[[Category:1810 deaths]]
 
  
−
[[cs:Joseph-Michel Montgolfier]]
+
<!--T:36-->
−
[[de:Montgolfier]]
+
* The first measurement is the very bottom of the form (and all others will be going from bottom to top) and is 3 1/2 inches each direction from the center.<br>
−
[[es:Hermanos Montgolfier]]
+
* Seven inches from the bottom is another measurement of 3 1/2 inches from center.<br>
−
[[fr:Frères Montgolfier]]
+
* Four inches up the center line is a measurement of 4 7/8 inches from center.<br>
−
[[io:Montgolfier fratuli]]
+
* Four more inches up the center line is a measurement of 6 3/4 inches from center.<br>
−
[[he:האחים מונגולפייה]]
+
* Six inches up the center line is a measurement of 8 5/8 inches from center.<br>
−
[[hr:Braća Montgolfier]]
+
* Six more inches up the center line is a measurement of 9 5/8 inches from center (this is the widest measurement).<br>
−
[[nl:Gebroeders Montgolfier]]
+
* Six inches beyond the widest measurement is a smaller measurement of 9 1/8 inches from center.<br>
−
[[ja:モンゴルフィエ兄弟]]
+
* Three inches up the line is a measurement of 7 1/2 inches from center.<br>
−
[[no:Brødrene Montgolfier]]
+
* Three inches further is a measurement of 6 1/2 inches from center.<br>
−
[[pl:Bracia Montgolfier]]
+
* Three inches further is a measurement of 4 3/4 inches from center.<br>
−
[[pt:Etiene e Joseph Montgolfier]]
+
* Three inches further is a measurement of 3 inches from center.<br>
−
[[ru:Монгольфье]]
+
* Finally, 2 3/4 to 3 inches further is your top measurement. The top measurement is 1 5/8 inches from center.
−
[[sr:Браћа Монголфје]]
+
 
−
[[fi:Montgolfierin veljekset]]
+
<!--T:37-->
−
[[sv:Montgolfier]]
+
Take the pen you are using to mark the measurements with and draw a line, starting from the bottom measurement, all the way around the outside of the measurement. It will look like a light bulb.
−
[[zh:孟格菲兄弟]]
+
 
 +
<!--T:38-->
 +
Cut along the line that you just drew to remove the extra material around the "light bulb" shape. That should give you the form needed to create the proper shape for the panels of your balloon.
 +
 
 +
===Directions for making balloon=== <!--T:39-->
 +
# Take 2 pieces of tissue paper and glue them end to end (vertically). Continue doing this with each set of tissue paper until you have 6 panels (a panel is 2 pieces of tissue paper glued end to end (vertically). You should only glue about a thumb's width or one straight line with the glue stick.
 +
# Once you have 6 panels, lay them one on top of another, making sure that one end of the stack has an even edge at the bottom of the panels.
 +
# Take the Panel Form and lay it on top of your 6 panels. Line up the bottom of the form with the straight edge of the 6 panels.
 +
# Trace, with a marker, along the edge of the form (making sure not to move the form or the panels). The form will not reach the other end your your panel stack. This is alright. Just keep tracing beyond the form in a diagonal line until you reach the top of your panel stack. Then remove the form from the stack of panels.
 +
# Take scissors and cut on the outside of the lines made earlier with the marker when you traced the panel form. When you are done, you should have two sets of scrap, one on each side of your panels. DO NOT THROW THESE AWAY! You may need to patch some panels that develop holes as well as use some of it to create a top for your balloon.
 +
# Remove two panels from your pile and set the other four aside. Place the two panels one-on-top-of-the-other, and then pull the top panel about one inch to the side of the bottom panel. With scissors, cut flaps along the exposed, curvy edge of the bottom panel, making the cuts two or three inches apart, and about a half inch deep. Do this all the way along one side of the bottom of the two panels. The flaps make it much easier to attach panels together.
 +
# Take a glue stick and apply glue to the top panels, right next to the tabs you just cut on the bottom panel. When applying the glue, you will only need one glue stick width of glue along the edge. Because the glue dries quickly, you may want to apply, at most, enough glue for 2 or 3 flaps at a time. Then you will fold over the flaps on the bottom panel onto the edge of the top panel where the glue was applied. Continue doing this until you have fully attached 2 of the panels together.
 +
# Take a third panel and lay it on top of the two panels that you just glued together. Lay it so that the edge of the top panel, of the 2 attached panels, that has not been glued is exposed about an inch.
 +
# Once again, cut flaps on the inch of exposed panel that are about a half inch deep. The glue and fold over the flaps to attach the third panel to the second panel. Now you should have 3 panels attached together. Continue repeating steps 8 & 9 until all of your panels have been attached. '''Remember to alternate which side you are cutting the flaps on so that you do not tamper with any of the joints of the other panels.'''
 +
# Once you have attached all 6 of your panels together, flip them over. Raise the top panel and fold the inner panels back. Do not crease the inner panels. Then replace the top panel.
 +
# Cut the bottom panel just as you have every panel before. Remember to make the cuts only about 1/2 inch deep. Then pull the top panel towards the edge of the bottom panel until you have the same width of the bottom panel as you would have for previous panels.
 +
# Apply glue to the top panel just as you have for every panel before. Remember that it may be easier to apply glue for only 2 or 3 panels at a time and then fold the flaps over before continuing to apply the glue.
 +
# Now. Open up your balloon. You will notice that it does not have a top yet. From the scraps that you saved, when you cut out your panels, pick as large a piece as possible. From this piece, cut as large a circle as you can. (You may fold the piece of paper over once or twice to make cutting out the circle easier.)
 +
# Apply glue to the circle you just cut out (around the outside edges by one or two glue stick widths). Then attach the circle to the top of your balloon to cover the hole.
 +
# Take some wire and cut roughly a 2 foot section off of the spool.
 +
# Take some needle-nose pliers and shape the wire into a rigid circle. (I suggest making a little loop in one end. Turning it slightly. Threading other end of the wire through the loop a little ways and the twisting the threaded wire around the looped end. This keeps the wire circle from expanding or contracting in size.)
 +
# Put the open end of the balloon through the wire circle. Then fold the balloon over the wire and glue the folded over end back to the balloon. (You may cut flaps in the open end of the balloon to make it easier to glue.) There will be more balloon surface than wire. You may have to fold the end of a panel or two over a little to decrease the amount of panel that you have to deal with while gluing the balloon over the wire.
 +
# At this point your balloon is finished. You will want to go over the entire surface of the balloon to make sure there are no holes in the panels, no unglued panel joints, no unglued balloon cap spots, or rips at the bottom where the wire is. If there are any of these issues, take some of your left over scraps (Aren't you glad you saved them?) and patch the balloon by gluing pieces from your scraps over any holes.
 +
 
 +
<!--T:89-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 13 -->
 +
{{ansreq|page={{#titleparts:{{PAGENAME}}|2|1}}|num=14}}
 +
<noinclude><translate><!--T:90-->
 +
</noinclude>
 +
<!-- 14. Successfully launch, fly, and recover the model hot air balloon(s) which you have built. -->
 +
 
 +
<!--T:41-->
 +
[[Image:launching balloon at night.jpg|thumb|300px|left|launching balloon at night]]
 +
 
 +
<!--T:42-->
 +
Take a single burner camp stove and use it to heat the air underneath your balloon. Be careful not to get the balloon too close to the flame as it will ignite and burn up.
 +
 
 +
<!--T:43-->
 +
A more efficient way of getting hot air into your balloon is to take some rigid dryer vent, cut notches that can be slid over the pot stabilizers on your camp stove, and then slide the vent pipe onto the stove. This causes the heated air to be channeled up the vent pipe into the balloon. However, this does not eliminate the possibility of your balloon igniting and burning up. You will have to keep the balloon from touching the vent pipe and also watch the balloon to make sure it doesn't start turning brown nearest the vent pipe.
 +
 
 +
<!--T:44-->
 +
You will need two (2) people to launch the balloon. One to hold the top end of the balloon up (until enough hot air is within the balloon), and the other to hold the balloon mouth over the stove. Before holding the balloon over the stove, tie a spool of string to the wire that keeps the form of the balloons mouth. Hold the balloon over the stove so that hot air may enter the balloon. Keep the balloon over the stove until it looks/feels as though it is ready to take off (usually anywhere from 30-45 seconds will do). When enough hot air has entered the balloon, release the balloon and let it fly up and away. Let the balloon fly for about twenty (20) seconds. When the balloon has successfully been flown pull on the string that you attached to the balloon to recover the balloon. The string keeps the balloon from being blown away as well as keeping it from flying into trees or other objects.
 +
 
 +
<!--T:45-->
 +
Please keep safe by using heat resistant gloves such as oven mitts or welders gloves. The metal duct does get hot. The balloon is not over the duct pipe long enough to catch fire. We had to have both gas burners going to get sufficient heat up the pipe. Happy flying. There is a good DVD called ''Night Crossing'' about a family who escaped over the Berlin border. They built two balloons and had two attempts to freedom.
 +
 
 +
<!--T:91-->
 +
<noinclude></translate></noinclude>
 +
{{CloseReq}} <!-- 14 -->
 +
<noinclude><translate></noinclude>
 +
==References== <!--T:46-->
 +
<noinclude></translate></noinclude>
 +
 
 +
[[Category:Adventist Youth Honors Answer Book/Do at home{{GetLangSuffix}}]]
 +
{{CloseHonorPage}}

Latest revision as of 02:14, 4 January 2023

Other languages:
English • ‎español
Hot Air Balloons

Skill Level

1

Year

2008

Version

02.06.2024

Approval authority

General Conference

Hot Air Ballooning AY Honor.png
Hot Air Balloons
Arts, Crafts and Hobbies
Skill Level
123
Approval authority
General Conference
Year of Introduction
2008
See also
Artisan Master Award


1

State the role each of the following played in the development of flying balloons.


1a

Joseph Michel Montgolfier and Jacques-Etienne Montgolfier


  • Joseph Michel Montgolfier

  • Jacques-Etienne Montgolfier

Joseph-Michel Montgolfier (26 August 1740 – 26 June 1810) and Jacques-Étienne Montgolfier (6 January 1745 – 2 August 1799) were the inventors of the montgolfière, or airship. The brothers succeeded in launching the first manned ascent, carrying a young physician and an audacious army officer into the sky.

Of the two brothers, it was Joseph who first contemplated building "machines". Joseph observed laundry drying over a fire incidentally form pockets that billowed upwards. Joseph set about building a box-like chamber 1 by 1 by 1.3 meters3 by 3 by 4 ft out of very thin wood and covering the sides and top with lightweight taffeta cloth. Under the bottom of the box he crumpled and lit some paper. The contraption quickly lifted off its stand and collided with the ceiling. Joseph then recruited his brother to balloon building.

The two brothers then set about building a contraption 3 times larger in scale (27 times larger in volume). The lifting force was so great that they lost control of their craft on its very first test flight on 14 December 1782. The device floated nearly 2 kilometres (about 1.2 mi). It was destroyed after landing by the "indiscretion" of passersby.


1b

Jean Francois Pilatre de Rozier and Francois Laurent Marquis d'Arlandes.


The first untethered balloon flight, by Rozier and the Marquis d'Arlandes on 21 November 1783.

Jean-François Pilâtre de Rozier (30 March 1754 – 15 June 1785) was a French chemistry and physics teacher, and one of the first pioneers of aviation. His balloon crashed near Wimereux in the Pas-de-Calais during an attempt to fly across the English Channel, and he and his companion, Pierre Romain, became the first known victims of an air crash.

In June 1783, he witnessed the first balloon flight of the Montgolfier brothers. On 19 September, he assisted with the untethered flight of a sheep, a cockerel and a duck from the front courtyard of the Palace of Versailles. After a variety of tests in October, he made the first manned free flight in history on 21 November 1783, accompanied by the ambitious Marquis d'Arlandes. During the 25-minute flight using a Montgolfier hot air balloon, they traveled 12 kilometres from the Château de la Muette to the Butte-aux-Cailles, then in the outskirts of Paris, attaining an altitude of 3,000 feet.


1c

Jacques Alexandre Cesar Charles and Nicolas Louis Robert.


In December of 1783, these two flew the first gas balloon, filled with hydrogen. This flight lasted for at least 2 hours, starting from the Tuileries gardens in Paris, and landing outside Paris where it was destroyed by terrified peasants.

Charles went on to discover Charles' Law which describes the relationship between the density of a gas and its temperature.


1d

Ben L. Abruzzo, Maxie L. Anderson, and Larry Newman


From 11 August to 17 August, 1978, these three completed the first transatlantic balloon flight in the Double Eagle II. They began their flight from Presque Isle, Maine and ended their flight at Miserey, France.

Ben Abruzzo and Larry Newman were also pilots on the Double Eagle V which in 1981 was the first balloon to cross the Pacific Ocean.


1e

Bertrand Piccard and Brian Jones


On March 1, 1999, Bertrand Piccard and Brian Jones began the first balloon flight to circumnavigate the earth. Their flight was a success and ended on March 20, 1999. The flight took 19 days and 21 hours. The flight started in Switzerland and ended in Egypt.



2

Cite the principle of Archimedes, and briefly describe how it applies to each of the following:


Archimedes' Principle states: any body fully or partially submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced.

2a

A piece of cork floating in a bowl of water


Cork is less dense than water, and weighs less than the volume of water displaced, causing the cork to float.


2b

A ship floating in the ocean


Ships, though made of dense materials, are shaped so that much of the interior is air. Because the weight of the ship and its cargo is less than the volume of water displaced, the ship will float.


2c

A hot air balloon floating in the atmosphere


As long as a balloon plus the gas it contains weighs less than the atmospheric air which it displaces, the balloon will float in the air.



3

Using a textbook of Chemistry, or a reference book of scientific tables, draw up a simple table showing the composition of air by weight and by volume.


Gas Air Percentage Weight of pure gas
Nitrogen 78% 1.25 g/liter
Oxygen 21% 1.43 g/liter
Argon .93% 1.78 g/liter
Carbon Dioxide .03% 1.96 g/liter
Other (including Neon, Helium,
Hydrogen, Xenon, & Radon)		 .04%

The average weight of air in a balloon can be worked out using rough percentages 80% Nitrogen and 20% oxygen as the make up of air. Atomic weight of Nitrogen is 14. Atomic weight of Oxygen is 16. Nitrogen and Oxygen gases are formed using two atoms. So for a balloon containing one mole (22.4 liters) of air, we can compute its weight:

80% x 28 + 30% x 32 = 0.8 x 28 + 0.2 x 32 = 22.4 + 6.4 = 28.8

So a balloon with 22.4 liters of air weighs 28.8 grams plus the weight of the balloon.



4

Draw up a simple table showing a comparison of the atomic number, atomic weight, and density of hydrogen, helium, nitrogen, and oxygen.



Atomic Number Atomic Weight Density (g/cm³)
Hydrogen 1 1.008 0.00008988
Helium 2 4.003 0.0001785
Nitrogen 7 14.01 0.0012506
Oxygen 8 16.00 0.001429


5

Name two gases that are used in flying gas filled balloons.


Hydrogen & Helium are both less dense than air and may be used when flying a balloon. Warm air is also used for flying balloons, since it is less dense than cold air.

  • Note: Hydrogen burns violently when ignited. After the destruction of the Hindenburg, hydrogen was largely abandoned for the flying of manned balloons.


6

Explain how heat/temperature affect the density of air, and how this applies to flying hot air balloons.


As described by Charles' Law, heat applied to a gas will cause its molecules to move farther apart, reducing it's density. When the air in a balloon is heated above the temperature of the surrounding air, the air in the balloon becomes less dense than the air outside the balloon. Because the balloon is less dense, it will float or rise. The greater the difference in temperature between the air in the balloon and the surrounding air, the greater the difference in density between the air inside and outside the balloon, which increases the lift that the balloon will generate. This explains why balloons are mostly launched in cooler weather.


7

Explain the role of each of the following in the structure and flying of a hot air balloon:


a. Envelope
The outer skin of the balloon, forming the container that holds the gas.
b. Support structure
The framework of larger balloons.
c. Throat
The lower opening through which the hot flame is applied to heat the air.
d. Fuel source
The fuel used to heat the air to make the balloon less dense than the surrounding air.


8

Name two materials that may be used for the envelope of a hot air balloon, and compare the advantages each accords because of its properties.


Paper
Paper may be used for model hot air balloons because of ease of acquisition and low price.
Plastic
Plastic may be used for model hot air balloons because it is water resistant, easy to work with, and easy to acquire.
Fabric
Fabric is usually used for larger, manned balloons. The fabric is specially treated.


9

Describe how flying balloons have served a useful function in


9a

Military campaigns


Military uses include: “eyes in the sky”, observation of enemy troops and positions, delivery of explosives to enemy positions, and defensive use of entangling incoming enemy flying craft.


9b

Scientific research


Scientific uses include instrument transport for data collecting, atmospheric studies, and aerial photography.



10

At what time of the day do most sport balloon flights take place? Why?


Early morning is best because the air has cooled over night making the difference of temperature inside & outside greater, thus increasing buoyancy.


11

Describe how a pilot controls the vertical movement of


11a

A hot air balloon


The pilot controls the vertical movement of a hot air balloon by burning more fuel to make the air in the balloon hotter, causes the air in the balloon to become less dense, making it rise. Conversely, turning off the flame and allowing the air in the balloon to cool renders the air in the balloon more dense with respect to the surrounding atmosphere, causing the balloon to descend. More rapid increases in altitude can be achieved by lessening the weight of the balloon usually by dropping ballast, however this is limited by the amount of ballast available.


11b

A gas filled balloon


Adding more of the lighter than air gas to ascend, and spilling some of the gas in order to descend varies the altitude of a helium or hydrogen filled balloon.



12

Describe how a pilot controls the lateral or horizontal movement of a flying balloon.


Horizontal movement of a gas filled flying balloon is entirely at the mercy of air currents. The pilot can only vary the altitude so as to get into the path of air currents, such as the jet stream. This involves careful study of charts of air currents, close attention to weather data, and a certain element of trial and error. Older airships, like the Hindenburg, had a rudder and propellers to move it so that it did not have to depend on air currents.


13

Build to completion one model hot air balloon (or two if working in pairs).


Materials

  • Tissue paper
  • Scissors
  • Glue Stick(s)
  • Sewing pins (optional)
  • Thin wire (22 gauge is suggested)
  • Needle-nose pliers & wire cutters
  • 1 50"x20" piece of Linoleum (for making balloon panel form)
  • A spool of string

Directions for balloon panel form

Illustration of distance from center

Use a rigid or semi-rigid material such as poster board or a piece of linoleum flooring. I would suggest a piece of linoleum flooring,as it is more rigid and can be used more times. Cut out a piece that is 50 inches long and 20 inches wide. For every other measurement, you will have to measure from the center of the form you are creating. You will need to mark each measurement on the outside edge (furthest from the center of the form).

  • The first measurement is the very bottom of the form (and all others will be going from bottom to top) and is 3 1/2 inches each direction from the center.
  • Seven inches from the bottom is another measurement of 3 1/2 inches from center.
  • Four inches up the center line is a measurement of 4 7/8 inches from center.
  • Four more inches up the center line is a measurement of 6 3/4 inches from center.
  • Six inches up the center line is a measurement of 8 5/8 inches from center.
  • Six more inches up the center line is a measurement of 9 5/8 inches from center (this is the widest measurement).
  • Six inches beyond the widest measurement is a smaller measurement of 9 1/8 inches from center.
  • Three inches up the line is a measurement of 7 1/2 inches from center.
  • Three inches further is a measurement of 6 1/2 inches from center.
  • Three inches further is a measurement of 4 3/4 inches from center.
  • Three inches further is a measurement of 3 inches from center.
  • Finally, 2 3/4 to 3 inches further is your top measurement. The top measurement is 1 5/8 inches from center.

Take the pen you are using to mark the measurements with and draw a line, starting from the bottom measurement, all the way around the outside of the measurement. It will look like a light bulb.

Cut along the line that you just drew to remove the extra material around the "light bulb" shape. That should give you the form needed to create the proper shape for the panels of your balloon.

Directions for making balloon

  1. Take 2 pieces of tissue paper and glue them end to end (vertically). Continue doing this with each set of tissue paper until you have 6 panels (a panel is 2 pieces of tissue paper glued end to end (vertically). You should only glue about a thumb's width or one straight line with the glue stick.
  2. Once you have 6 panels, lay them one on top of another, making sure that one end of the stack has an even edge at the bottom of the panels.
  3. Take the Panel Form and lay it on top of your 6 panels. Line up the bottom of the form with the straight edge of the 6 panels.
  4. Trace, with a marker, along the edge of the form (making sure not to move the form or the panels). The form will not reach the other end your your panel stack. This is alright. Just keep tracing beyond the form in a diagonal line until you reach the top of your panel stack. Then remove the form from the stack of panels.
  5. Take scissors and cut on the outside of the lines made earlier with the marker when you traced the panel form. When you are done, you should have two sets of scrap, one on each side of your panels. DO NOT THROW THESE AWAY! You may need to patch some panels that develop holes as well as use some of it to create a top for your balloon.
  6. Remove two panels from your pile and set the other four aside. Place the two panels one-on-top-of-the-other, and then pull the top panel about one inch to the side of the bottom panel. With scissors, cut flaps along the exposed, curvy edge of the bottom panel, making the cuts two or three inches apart, and about a half inch deep. Do this all the way along one side of the bottom of the two panels. The flaps make it much easier to attach panels together.
  7. Take a glue stick and apply glue to the top panels, right next to the tabs you just cut on the bottom panel. When applying the glue, you will only need one glue stick width of glue along the edge. Because the glue dries quickly, you may want to apply, at most, enough glue for 2 or 3 flaps at a time. Then you will fold over the flaps on the bottom panel onto the edge of the top panel where the glue was applied. Continue doing this until you have fully attached 2 of the panels together.
  8. Take a third panel and lay it on top of the two panels that you just glued together. Lay it so that the edge of the top panel, of the 2 attached panels, that has not been glued is exposed about an inch.
  9. Once again, cut flaps on the inch of exposed panel that are about a half inch deep. The glue and fold over the flaps to attach the third panel to the second panel. Now you should have 3 panels attached together. Continue repeating steps 8 & 9 until all of your panels have been attached. Remember to alternate which side you are cutting the flaps on so that you do not tamper with any of the joints of the other panels.
  10. Once you have attached all 6 of your panels together, flip them over. Raise the top panel and fold the inner panels back. Do not crease the inner panels. Then replace the top panel.
  11. Cut the bottom panel just as you have every panel before. Remember to make the cuts only about 1/2 inch deep. Then pull the top panel towards the edge of the bottom panel until you have the same width of the bottom panel as you would have for previous panels.
  12. Apply glue to the top panel just as you have for every panel before. Remember that it may be easier to apply glue for only 2 or 3 panels at a time and then fold the flaps over before continuing to apply the glue.
  13. Now. Open up your balloon. You will notice that it does not have a top yet. From the scraps that you saved, when you cut out your panels, pick as large a piece as possible. From this piece, cut as large a circle as you can. (You may fold the piece of paper over once or twice to make cutting out the circle easier.)
  14. Apply glue to the circle you just cut out (around the outside edges by one or two glue stick widths). Then attach the circle to the top of your balloon to cover the hole.
  15. Take some wire and cut roughly a 2 foot section off of the spool.
  16. Take some needle-nose pliers and shape the wire into a rigid circle. (I suggest making a little loop in one end. Turning it slightly. Threading other end of the wire through the loop a little ways and the twisting the threaded wire around the looped end. This keeps the wire circle from expanding or contracting in size.)
  17. Put the open end of the balloon through the wire circle. Then fold the balloon over the wire and glue the folded over end back to the balloon. (You may cut flaps in the open end of the balloon to make it easier to glue.) There will be more balloon surface than wire. You may have to fold the end of a panel or two over a little to decrease the amount of panel that you have to deal with while gluing the balloon over the wire.
  18. At this point your balloon is finished. You will want to go over the entire surface of the balloon to make sure there are no holes in the panels, no unglued panel joints, no unglued balloon cap spots, or rips at the bottom where the wire is. If there are any of these issues, take some of your left over scraps (Aren't you glad you saved them?) and patch the balloon by gluing pieces from your scraps over any holes.


14

Successfully launch, fly, and recover the model hot air balloon(s) which you have built.


launching balloon at night

Take a single burner camp stove and use it to heat the air underneath your balloon. Be careful not to get the balloon too close to the flame as it will ignite and burn up.

A more efficient way of getting hot air into your balloon is to take some rigid dryer vent, cut notches that can be slid over the pot stabilizers on your camp stove, and then slide the vent pipe onto the stove. This causes the heated air to be channeled up the vent pipe into the balloon. However, this does not eliminate the possibility of your balloon igniting and burning up. You will have to keep the balloon from touching the vent pipe and also watch the balloon to make sure it doesn't start turning brown nearest the vent pipe.

You will need two (2) people to launch the balloon. One to hold the top end of the balloon up (until enough hot air is within the balloon), and the other to hold the balloon mouth over the stove. Before holding the balloon over the stove, tie a spool of string to the wire that keeps the form of the balloons mouth. Hold the balloon over the stove so that hot air may enter the balloon. Keep the balloon over the stove until it looks/feels as though it is ready to take off (usually anywhere from 30-45 seconds will do). When enough hot air has entered the balloon, release the balloon and let it fly up and away. Let the balloon fly for about twenty (20) seconds. When the balloon has successfully been flown pull on the string that you attached to the balloon to recover the balloon. The string keeps the balloon from being blown away as well as keeping it from flying into trees or other objects.

Please keep safe by using heat resistant gloves such as oven mitts or welders gloves. The metal duct does get hot. The balloon is not over the duct pipe long enough to catch fire. We had to have both gas burners going to get sufficient heat up the pipe. Happy flying. There is a good DVD called Night Crossing about a family who escaped over the Berlin border. They built two balloons and had two attempts to freedom.



References

Retrieved from "https://wiki.pathfindersonline.org/index.php?title=AY_Honors/Hot_Air_Balloons/Answer_Key&oldid=591563"