Difference between revisions of "AY Honors/Model Boats/Answer Key/es"

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< AY Honors‎ | Model BoatsAY Honors/Model Boats/Answer Key/es
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Many model boats are pre-built ready to display, while many kits are meant to sit on a shelf, not sail. None of these are useful for this Honor. Try a search for [https://www.google.ca/search?q=working+model+boat+kits&oq=working+model+boat+&aqs=chrome.2.57j0l3j62l2.15894j0&sourceid=chrome&ie=UTF-8 working model boat kits] and radio controlled model boats.
 
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You will want to look for a RC or Radio Controlled boat.
 
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For this you will likely need a model or plans to scratch build.
 
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Displacement is the volume of water a boat's hull moves out of the way when it floats. The displaced water is the same weight as the boat as long as the boat is floating. If the boat sinks then the amount of water being displaced is equal to the volume of the boat instead of the weight.
 
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The center of gravity is a geometric property of any object. The center of gravity is the average location of the weight of an object.http://www.grc.nasa.gov/WWW/k-12/airplane/cg.html
 
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Propeller pitch is the distance a propeller would move in one revolution if it were moving through a soft solid, like a screw through wood. For example, a 21-pitch propeller would move forward 21 inches in one revolution.
 
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Thrust is the force exerted by a propeller to move a boat through the water. As the boat moves forward, it may experience lift, which is a force that will raise the boat slightly.
 
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[[Image:Monohull.svg|200px|left]] A monohull is a type of boat having only one hull, unlike multihulled boats which can have two or more individual hulls connected to one another.
 
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A hydroplane (or hydro, or thunderboat) is a fast motorboat, where the hull shape is such that at speed, the weight of the boat is supported by planing forces, rather than simple buoyancy.
 
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A key aspect of hydroplanes is that they use the water they are on for lift rather than buoyancy, as well as for propulsion and steering: when travelling at high speed water is forced downwards by the bottom of the boat's hull. The water therefore exerts an equal and opposite force upwards, lifting the vast majority of the hull out of the water. This process, happening at the surface of the water, is known as ‘planing’.
 
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[[File:EllstromManufacturingHydroplane.jpg‎|thumb|300px|left|Hydroplane]]
 
 
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The front of the boat.
 
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has two distinct meanings related to two different types of boats: one a riverine cargo-capable working boat, and the other a classification for small- to mid-sized recreational sailing yachts.
 
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The wide, usually flat area at the very back of a boat. This is where an outboard motor is typically mounted. This is also where you usually find the name of the boat on larger vessels.
 
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Inefficient low-pressure pockets on propellers form bubbles that collapse against the blades resulting in premature wear. Cavitation causes vibration, noise and serious damage to a propeller.
 
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Heeling is normal, sideways tipping. Heeling is a result of the force of wind on the sails. Some heeling is inherent in sailing; as the force of the wind is transferred into forward motion, any excess is transferred into sideways motion, some of which is slippage and some of which is heeling. A boat that has too much sail set so that it heels over beyond a certain angle will sail less efficiently.
 
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When a boat is heeled, the center of effort changes. The center of effort is the pivot point of the sails and is related to the center of lateral resistance, which is below the waterline. One way to reduce heeling is to move the center of lateral resistance upwards by raising the centerboard or daggerboard. The boat will have less resistance below the waterline and consequently less heel.
 
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Planing is the mode of operation for a waterborne craft in which its weight is predominantly supported by hydro-dynamic lift, rather than hydro-static lift (buoyancy). See Hydro above. Some types of [https://en.wikipedia.org/wiki/Planing_(sailing)}| sailboats can plane] too.
 
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The force on the sails is broken down into two components: lift (which acts perpendicular to the wind direction) and drag (which acts parallel to the wind direction). Lift and drag are defined as acting in these two directions;
 
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# https://en.wikipedia.org/wiki/Planing_(sailing)
 
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# http://www.real-world-physics-problems.com/physics-of-sailing.html
 
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Latest revision as of 16:11, 14 July 2022

Other languages:
English • ‎español
Botemodelismo

Nivel de destreza

2

Año

1991

Version

29.11.2024

Autoridad de aprobación

Asociación General

Model Boats AY Honor.png
Botemodelismo
Artes y actividades manuales
Nivel de destreza
123
Autoridad de aprobación
Asociación General
Año de introducción
1991
Vea también
Maestría de Artesanía


1

Hacer dos de los siguientes:


1a

Comprar y construir un kit para un velero de 10 a 15 pulgadas (25 a 38 cm) de largo y unos 4 a 5 pulgadas (10 a 13 cm) de ancho y operar el barco en agua, por lo menos durante dos minutos.



1b

Construir un modelo de barco con un motor eléctrico de sus propios planos o de un modelo comprado tamaño 10 a 18 pulgadas (25 a 46 cm) y operar el barco durante tres a cinco minutos.



1c

Construir un modelo de barco de 18 a 30 pulgadas (46 a 76 cm) de largo de sus propios planos o de un modelo comprado. Instalar un peuqeño motor de combustión interna de .029 o .049 y operar durante un mínimo de dos exitosas series de tres a cinco minutos. Llevar un registro por escrito de las características de funcionamiento del modelo y especifica lo que se hizo para mejorar su rendimiento.




2

Identificar y definir estas palabras:


2a



2b

Centro de gravedad



2c

Hélice



2d

Empuje y ascenso



2e

Mono casco



2f

Hidro



2g

Proa / Bulbo de Proa



2h

Quilla



2i

Espejo



2j

Cavitación



2k

Escora



2l

Planeación



2m

Arrastre





Referencias

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