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Design => Stunt design => Topic started by: TroyMartin on April 26, 2017, 08:58:03 PM

Title: Shorter outboard wing panel
Post by: TroyMartin on April 26, 2017, 08:58:03 PM
I have noticed that some stunt planes have a shorter (half a bay or so) outer wing panel and was curious why?????  Thanks!
Title: Re: Shorter outboard wing panel
Post by: Air Ministry . on April 26, 2017, 09:09:13 PM
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^^

Title: Re: Shorter outboard wing panel
Post by: Mark Scarborough on April 26, 2017, 09:24:34 PM
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
Title: Re: Shorter outboard wing panel
Post by: TroyMartin on April 26, 2017, 09:26:46 PM
Thanks !
Title: Re: Shorter outboard wing panel
Post by: Brett Buck on April 26, 2017, 09:43:56 PM
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