AY Honors/Model Boats/Answer Key - Revision history

W126jep: - Category of AYHAB

2022-07-14T16:06:53Z

- Category of AYHAB

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2021-04-28T15:26:55Z

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W126jep at 15:26, 28 April 2021

2021-04-28T15:26:34Z

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2021-03-19T03:09:09Z

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Jomegat bot: Jomegat bot moved page Adventist Youth Honors Answer Book/Arts and Crafts/Model Boats to AY Honors/Model Boats/Answer Key: Bot: Moved page

2020-12-19T03:32:14Z

Jomegat bot moved page AY Honor Model Boats to AY Honor Model Boats Answer Key: Bot: Moved page

W126jep: Marked this version for translation

2015-01-07T19:02:57Z

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W126jep: + translate tags

2015-01-07T19:02:41Z

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JadeDragon: /* e. Mono hull */

2014-10-30T20:56:02Z

e. Mono hull

JadeDragon: /* b. Center of gravity */

2014-10-30T20:54:21Z

b. Center of gravity

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 # http://www.real-world-physics-problems.com/physics-of-sailing.html
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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.
+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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-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
+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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-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.
+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.
+[[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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-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.
+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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 |authority=General Conference
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-==1. Do two of the following: ==
+==1. Do two of the following: == <!--T:1-->
 ===a. Purchase and build one kit for a sailboat 10 to 15 inches (25.4 to 38.1 cm) long and about four to five inches wide and operate boat on the water for at least two minutes. ===
 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.
-===b. Build a model boat with an electric motor from your own plans or from a kit, size 10 to 18 inches, (25.4 to 45.7 cm) and operate the boat for three to five minutes. ===
+===b. Build a model boat with an electric motor from your own plans or from a kit, size 10 to 18 inches, (25.4 to 45.7 cm) and operate the boat for three to five minutes. === <!--T:3-->
 You will want to look for a RC or Radio Controlled boat.
-===c. Build a model boat 18 to 30 inches (45.7 to 76.2 cm) long from your own plans or from a kit. Install a small bore internal combustion engine .029 or .049 and operate for at least two successful runs of three to five minutes each. Record in writing the operating characteristics of the model and state what you did to improve its performance. ===
+===c. Build a model boat 18 to 30 inches (45.7 to 76.2 cm) long from your own plans or from a kit. Install a small bore internal combustion engine .029 or .049 and operate for at least two successful runs of three to five minutes each. Record in writing the operating characteristics of the model and state what you did to improve its performance. === <!--T:5-->
 For this you will likely need a model or plans to scratch build.
-==2. Identify and define these words: ==
+==2. Identify and define these words: == <!--T:7-->
 ===a. Displacement ===
 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.
-===b. Center of gravity===
+===b. Center of gravity=== <!--T:8-->
 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
-===c. Propeller pitch ===
+===c. Propeller pitch === <!--T:10-->
 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.
-===d. Thrust and lift ===
+===d. Thrust and lift === <!--T:11-->
 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.
-===e. Mono hull ===
+===e. Mono hull === <!--T:12-->
 [[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.
-===f. Hydro ===
+===f. Hydro === <!--T:13-->
 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.
 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’.
 [[File:EllstromManufacturingHydroplane.jpg‎|thumb|300px|left|Hydroplane]]
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-===g. Bow ===
+===g. Bow === <!--T:16-->
 The front of the boat.
-===h. Keel ===
+===h. Keel === <!--T:17-->
 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.
-===i. Transom ===
+===i. Transom === <!--T:19-->
 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.
-===j. Cavitation ===
+===j. Cavitation === <!--T:20-->
 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.
-===k. Heeling ===
+===k. Heeling === <!--T:21-->
 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.
 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.
-===l. Planing===
+===l. Planing=== <!--T:23-->
 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.
-===m. Drag ===
+===m. Drag === <!--T:25-->
 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;
-==References==
+==References== <!--T:27-->
 # https://en.wikipedia.org/wiki/Planing_(sailing)
 # https://en.wikipedia.org/wiki/Hydroplane_(boat)

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 # https://en.wikipedia.org/wiki/Hydroplane_(boat)
 # http://www.real-world-physics-problems.com/physics-of-sailing.html
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AY Honors/Model Boats/Answer Key - Revision history

W126jep: - Category of AYHAB

W126jep: Marked this version for translation

W126jep at 15:26, 28 April 2021

Jomegat bot: Bot: Automated import of articles *** existing text overwritten ***

Jomegat bot: Bot: Automated import of articles *** existing text overwritten ***

Jomegat bot: Jomegat bot moved page Adventist Youth Honors Answer Book/Arts and Crafts/Model Boats to AY Honors/Model Boats/Answer Key: Bot: Moved page

W126jep: Marked this version for translation

W126jep: + translate tags

JadeDragon: /* e. Mono hull */

JadeDragon: /* b. Center of gravity */

Jomegat bot: Bot: Automated import of articles * existing text overwritten *

Jomegat bot: Bot: Automated import of articles * existing text overwritten *