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Old 10-12-2002, 01:49 PM
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Pelle Gris
 
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Default 1:5 Scale Yakovlev Yak-3

Hi All...

I´m in the process of drawing up plans for a 1:5 scale Yak-3 and need some help on the wing design.
The airfoil used on the full size is a Clark YH series, and from looking at the airfoil it seems to me that it should perform quite OK on a model. It is quite similar to a normal Clark Y except that the T.E. curves slightly upwards.
From measuring the 3-view it looks to me like the root airfoil is about 14% and the tip about 8-10%.
The incidences/angles on the original is close to 0-0-0 (wing 0° - tailplane 0° - engine 0°).
I plan on introducing 2-3° wash-out in the wing.
My main concern is that given the 0° incidence at the root, combined with wash-out will make the wingtip give negative lift(downforce???)
Does this seem like an OK setup on a model?
Any other advice is most welcome...

Additional specs:
Wingspan: 72.5in
Wing Area: 961sq.in
Length: 67.5in
Weight: 15-17lb (hopefully)
Engine: 35cc Webra Bully on glow