stunthanger.com
Design => Stunt design => Topic started by: TroyMartin on April 26, 2017, 08:58:03 PM
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I have noticed that some stunt planes have a shorter (half a bay or so) outer wing panel and was curious why????? Thanks!
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To carry the weight of the LINES !
If a plane ' comes in ' on equal panels , they tend to ' roll up the lines ' ,
whereas a longer inner will lift the inner ( upright or inverted ' and tends to fly the lines TIGHT , of its own accord .
Though thats outside the design criteria of ' pro ' :-\ F2B / P. A. , where 1/2 assymetry seems to be preferred ,
being theyre Supposed to stay out there full time . Thus they carry more tip weight . S?P
H^^
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lots of technical explenations are appropriate but the simplest answer is that as the plane flies, the inboard wing covers less distance and slower so it is longer to create a semblance of symmetrical lift to the outboard which is moving faster but farther
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Thanks !
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I have noticed that some stunt planes have a shorter (half a bay or so) outer wing panel and was curious why????? Thanks!
Since the airplane flies in a circle, the outboard wing travels a little bit faster than the inboard. To get the lateral (left-right) center of pressure in the middle, the inboard wing has to be slightly longer.
It's not extremely critical. The right difference for typical 40-60 sized stunt planes is about 3/4", but an inch or so is OK, and zero is also workable. If you make it the same length on each side, the CP will be shifted over about 1/4-3/8" to the right, and you have to add a bunch of tip weight to shift the CG over that far, too.
Brett