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Design => Stunt design => Topic started by: Dennis Toth on September 16, 2014, 08:44:43 AM
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Guys,
I'm working on a new ship and wanted to have a straight trailing edge and flap look (normal sweep to the leading edge) . This would have the flaps as a constant cord. I was wondering if anyone has used constant cord flaps and is there any negative impact on the control stability with the tips having effectively more flap area then the wing center?
Best, DennisT
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I don't think you mean "control stability", but it shouldn't hurt the airplane stability, and it might be beneficial for hinge moment. You'll have more flap than you need at the tips, particularly the inside tip, and less than you oughta have at the root, but I doubt if that's a big deal. If I wanted that look, I'd mask a straight line on the flaps and paint the back black.
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Dennis,
I'm putting a model together with a constant cord wing and straight flaps also.
The aircraft I'm modeling doesn't call for flaps.
I was and probably will, have a 1" to 1.25" flap cord when I'm done.
The thinner the width of the flap, probably the more movement necessary? I'm guessing with that.
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The thinner the width of the flap, probably the more movement necessary? I'm guessing with that.
I was guessing with that this past weekend, especially after reading the piece on Gurney flaps. If the flow is separated, maybe you could have a really small chord flap and move it =/- 90 degrees.
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Dennis,
I'm putting a model together with a constant cord wing and straight flaps also.
Charles, Dennis has a tapered wing - as in "(normal sweep to the leading edge). "
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Charles, Dennis has a tapered wing - as in "(normal sweep to the leading edge). "
Chris,
Thanks, I see that now.
I wonder if it's his twin boom?
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I was guessing with that this past weekend, especially after reading the piece on Gurney flaps. If the flow is separated, maybe you could have a really small chord flap and move it =/- 90 degrees.
Spoiler flaps. LL~
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I was guessing with that this past weekend, especially after reading the piece on Gurney flaps. If the flow is separated, maybe you could have a really small chord flap and move it =/- 90 degrees.
Flap width = 0
Deflection = 90º
Works for me!
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That's a degenerate case, and I'm a degenerate. It all fits together.
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I don't think you mean "control stability", but it shouldn't hurt the airplane stability, and it might be beneficial for hinge moment. You'll have more flap than you need at the tips, particularly the inside tip, and less than you oughta have at the root, but I doubt if that's a big deal.
Compared to all the Nobler clones, the newest planes often seem to have very little taper in their flaps -- I'm particularly thinking of the Impact, but I've seen the same thing on other planes. I'm assuming that this was not done for aesthetics alone.
When faced with the whole "I want straight flaps" question, I just made the flaps run out about 3/4 of the way out, matched by a TE. I know that's supposed to cause problems, but I wasn't a good enough flyer for it to make a difference!