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All Forums >> RC Airplanes >> Beginners >> Wing shape
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Wing shape - 7/22/2008 8:36:53 PM   
zbird68


 

Posts: 33
Joined: 10/3/2007
From: Newton Falls, OH, USA
Status: offline 		If the curved top part of a planes wing gives it lift,How does a 3D plane get lift? when both the top and bottom have the same shape. Would they not cancel each other?
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RE: Wing shape - 7/22/2008 8:46:52 PM   
rwright142



Posts: 1745
Joined: 9/2/2004
From: Beech Grove, IN, USA
Status: offline 		The wing shape is only part of what gives a wing lift. Research Angle of Attack (AOA).

< Message edited by rwright142 -- 7/22/2008 8:48:54 PM >

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RE: Wing shape - 7/22/2008 8:53:12 PM   
capo915


 

Posts: 80
Joined: 10/6/2006
From: El Paso, TX, USA
Status: offline 		A 3d plane gets its lift from overpowering its weight(thrust to weight ratio). However a symmetrical wing can deliver lift when the elevator is applied. Think of this.................When you go full throttle on a trainer, the plane usually lifts off by itself. Very little elevator input is required for lift. However, in a lets say Extra 300(low wing ), if you go full throttle the plane will stay on the ground until elevator is mixed in. Its not always like this and there are more variables that play important roles (balancing, CG) but thats the jist of it.

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RE: Wing shape - 7/22/2008 9:16:48 PM   
Allfat


 

Posts: 155
Joined: 4/22/2008
From: Portland, OR, USA
Status: offline 		Even a flat plate can create lift if it has enough velocity and angle of attack. Do some research on your own and you should be able to find the answer by yourself.

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RE: Wing shape - 7/22/2008 11:03:49 PM   
zbird68


 

Posts: 33
Joined: 10/3/2007
From: Newton Falls, OH, USA
Status: offline 		Thanks for the information, did some research on AOA, now I understand.

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RE: Wing shape - 7/22/2008 11:17:08 PM   
Allfat


 

Posts: 155
Joined: 4/22/2008
From: Portland, OR, USA
Status: offline
quote:

ORIGINAL: capo915
in a lets say Extra 300(low wing )

Actually the wing placement has nothing to do with it, it is the wing profile that matters. You can have a high wing symmetrical airfoil and the same theory applies.

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RE: Wing shape - 7/23/2008 12:23:53 AM   
flyingJ


 

Posts: 101
Joined: 9/13/2005
From: Hartford, NY, USA
Status: offline 		Cut an 8 inch circle from 1/8" cardboard, throw it with aslight upward AOA. The disk will climb till it excedes it's optimum AOA, or till it's airspeed drops till it can no longer create enough lift and it "lands/crashes". Speed and power can over come gravity. That's why PIGS can fly in tornado alley.LOL

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RE: Wing shape - 7/23/2008 1:26:44 AM   
capo915


 

Posts: 80
Joined: 10/6/2006
From: El Paso, TX, USA
Status: offline 		Allfat, I was making a remark on shape of the plane. If hes asking about wing deflection then he probably doesnt know what an Extra 300 looks like.

< Message edited by capo915 -- 7/23/2008 1:28:31 AM >

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RE: Wing shape - 7/23/2008 8:52:16 PM   
JohnW



Posts: 1485
Joined: 3/22/2002
From: Lincoln, NE, USA
Status: offline 		Capo, balance and CG have nothing to do with lift generation. While in a TR, or similar maneuver, it is true that the propeller must generate lift (thrust) capable of holding the weight of the plane, but 3D planes need the lift generated from their wings for most other maneuvers. As was indicated in the first response, the key is AOA. -Cheers

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RE: Wing shape - 7/23/2008 9:16:21 PM   
bruce88123


 

Posts: 10424
Joined: 11/26/2004
From: Memphis, TN, USA
Status: online 		Actually, the Extra (and most other tail draggers) has a positive angle of attack while sitting at rest on the ground. Without changing it's attitude it WILL take off when the speed gets high enough. This is NOT the best way of doing it but it would work. (Best on pavement)

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