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Old September 15th 19, 04:30 AM posted to rec.aviation.soaring
Roy Garden
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Posts: 17
Default Wing flex at higher speed DG-100

The 25 has an "interesting" "gearbox" for the control surfaces on the
wings from negative flap to flap 4 the trailing edge moves in a fairly
uniform way (all 3 trailing edge controls per wing)
so coming in, in full negative to do a "beat up" the wing bends up quite
impressively.
As you slow down and find yourself underbraking due to the pitiful
brakes and go to flap L
All bets are off on the trailing edges, the inboard "flaps" come down
almost vertically to act as brakes, the mid wing control surface comes
down a little to act as flap and the outboard ailerons get kicked up to act

like spoilerons (still work as ailerons but almost zero positive effect)

The RC guys use the same effect and call it "Crow" braking (as it mimics
a crow coming in to land hot)

An underbraked approach into a short field has a 25 going from wings
point up to wings point down, quite entertaining.

There is a dodge used by 25 pilots to stop a bounced landing of having
P2 ready on the flaps and as the main gear touches, go from flap 4
(recomended landing flap) to full negative flap.
It does stop a bounce, but can end up belting the tail off the deck quite
positively.
Alternate bounce prevention is to "fly it on" and have the wheelbrake
applied a bit, that pitches the nose forward as the wheel bites thus
"sticking" the glider (which has an effective enough pitch stability to
avoid touching the nose (usually, YMMV)
Alternatively, you can land it properly with a fully held off landing . .
rarely managed any of those . .

Complete sidetrack, aplogies, Miss the old 25 sometimes.
Not times that involve rigging, ground handling, flying fast or thermalling

. . but sometimes . .