wash in and wash out
12-07-2009, 11:36 AM
#2
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RE: wash in and wash out
If you are measuring the 2 degrees positive at the wing root relative to the wing tip (0 degrees) that would be wash-out, just what you want. That means that the angle of incidence of the wing root is 2 degrees more than the tip of the wing. This causes the inboard section of the wing to stall before the wing tip, keeping the ailerons more effective. 1 - 2 degrees is reasonable. Leave the tip at 0 degrees. The change from +2 degrees to 0 degrees should occur gradually along the span of each 1/2 of the wing. Since you didn't say what kind of plane this is for, I would assume it is a general sport plane. According to Duncan Hutson, a prominent British scale modeler, "1-1/2 degrees is a good all round compromise on an aerobatic type scale model".
12-07-2009, 11:56 AM
#3
RE: wash in and wash out
the plane is a c a p dauntless and i was measuring at the wing tip , the wing also calls for 2 degrees tip back upon installation on the saddle.although i have read that the full size was back 3 degrees . the wing tip blocks havent been sanded yet , this is just a hypothetical question. the center section is at 0 deg . because of the large wingtips this is going to be hard to measure anyway.
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