Design > Stunt design

Another odd question - Forward sept wing trailing edge and flap hinge line

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doug coursey:
WHY NOT SWEEP THE ELE TRAILING EDGE ALSO

Chuck_Smith:
I can only speak from my own experience; my Bearcat has both a swept-forward TE and dihedral. It glides through the pattern pretty effortlessly. Now that said, it's a profile with a GIANT fuselage cross-section so the dihedral is likely having a very minimal Dutch roll effect. It also has a boat-load of tip weight.

In theory I don't think a swept fwd TE will have much affect good or bad other than moving the MAC around and moving the plane's CG point forward a little. It does however, complicate the heck out of linkages and add complexity to your build. I recon the reason we see straight TE hinge lines on the "99th percentile stunter" is that it makes it simple to rig the flaps.

From a retired aero-guy perspective, I tend to worry more about the taper ratio and aspect ratio than sweep. Controline airplanes are weird due to being tethered to the earth so you need a stiff drink before you start thinking about inertial reference frames and relative wind  <=


Without flaps? Swept fwd TE is everywhere in combat and the old Sneeker, Shoestring, Ringmaster and many more have a swept fwd TE and they fly (for what they are) pretty nice IMHO.

YMMV and that's cool, it's an interesting discussion.

Chuck

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