Design > Stunt design

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

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Bill Schluckbier:
Hi -

I just noticed you reply, a few months late.  Thank you for the information and my apologies for the lateness.

Dave_Trible:
In scanning over Scientifictions stuff from above a light went on (dimly) in my head.   He was talking about the airplane flying in an outward skew and that then making the swept trailing edge outboard nearly parallel with the lines,   tangent to the flight path and then the inboard side more seriously raked forward,  which would present that wing flap ahead of the outboard side and turned to accumulate more of the waining boundary layer to work with.  On my Neptune and other classics from that era that used swept edges,  very little to NO tip weight is/was used.   Perhaps the differences in lift side to side more or less negated to need for tip weight......hm....that would also be true to a much smaller extent with the straight TE.  It may also be a source of confoundment in the trimming process-attempting to use tip weight as standard fare when it might not be needed...

Dave

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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