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Old 08-09-2009 | 08:41 PM
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bigal126
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From: Strongsville, OH
Default Incidence question

I am building a kit. It is a goldberg extra 300. Fully symetrical wing. 68" wingspan. The plane will weigh about 9 lbs AUW when done.

The plan shows 0 incidence for both the wing and the horizontal stab off of the datum line. I am about to glue in the wing bolting platform. As it stands, the wing shows a -1 degree incidence when the horizontal stab is set at zero. In other words the wing and stab have a 1 degree difference between them. The trailing edge of the wing is higher than the leading edge. I think that means it has a negative incidence.

My question is whether I should try to correct the difference or is -1 degree no big deal? It'll be a little extra work to get the wing set at zero, but if it isn't going to make any difference in how the plane flies, then I won't do it.

Another question would be: Would it be better if the wing incidence was a little positive, or a little negative? I'm not sure if I can get it dead on, but I'll err on the better side if there is such a thing.

Thanks!