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characteristics of this wing

Old 10-10-2009, 03:41 AM
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Keith C
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Default characteristics of this wing

How will this wing fly?
A/R is less than 2-1, 8.4 thickness, flat bottom,leading edge is carbon tube about 3/16 dia. Plane AUW is 16.5.
Thanks, Keith C.
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Old 10-10-2009, 09:15 AM
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Keith C
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sorry guys, the total area is about 528.
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Old 10-10-2009, 09:34 AM
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slipstick
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Some units might be useful ? 8.4, 3/16, 16.5, 528 what ?

I'm guessing 3/16 is probably inches but not so sure about the others.

Steve
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Old 10-10-2009, 12:14 PM
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Sky Sharkster
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Default Low Aspect Ratio Wing?

Hello Keith,
To answer your question, not very well, I'm afraid.
An aspect ratio of 2:1 (or less) wing will have a very low L/D (lift to drag) ratio, far below a normal A/R of 5:1 to 8:1. Also the tip vortices and tip losses will be high. About the only thing a short, stubby wing has going for it is a faster roll rate, and possibly greater strength span-wise. http://www.lems.brown.edu/vision/peo.../Ch6_wing.html
Here's a graph showing how the maximum lift coefficient increases with increased aspect ratio + vice versa;
http://worldofaerospace.googlepages....t-RC-plane.htm
So, I believe a higher A/R would be a better aerodynamic choice.
Ron
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Old 10-11-2009, 06:42 AM
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JetPlaneFlyer
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As Ron indicated, on low aspect ratio (AR) wings there is a lot of drag (specifically induced drag) and the angle of attack required to produce a set amount of lift is higher than a 'normal' AR wing (this is what the graph was showing, the 'lift slope' of the low AR wing is shallower)

This mainly effects the model when it's being flown at a high coefficient of lift, i.e. slowly or pulling tight turns. When being flown quite fast and straight hence at low lift coefficient then low aspect ratio wings work ok.

Stall behavior of low aspect ratio wings also to be gentle and as Ron said they are usually strong.

Providing you have planty of power and dont expect a good glide then your low AR wing could work ok.. But something with a moderate AR would be much more efficient.
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