Bill Daniels wrote:

"cernauta" wrote in message
...

"Bill Daniels" wrote:


Tape two yaw strings (which then become pitch strings) on each side of

the

canopy at the lowest and most forward part you can still see.

The string angle difference between minimum sink and stall is large so

the

bright red, wiggling strings angled up steeply are a good visual stall
warning.

That must be true only for unflapped gliders, or it's valid only for
one specific flap setting in a flapped glider. Or you have to make
different coloured markings for each and every flap setting.

Aldo Cernezzi


You're right about flaps making a difference in the calibration. I've only
tried this on two flapped gliders and one without flaps. However, It seemed
to work pretty well in all cases. I actually didn't see too much difference
in the string indications at different flap settings.

The flap issue is partly moot since the flap settings are related to
airspeed bands. Stall concerns would likely arise only with the flaps in
their most positive two settings, landing or slow thermalling. The
near-stall indication is very obvious.

Have you tried these in a shallow turning stall, when it is the wing tip
that stalls, not the root?

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Eric Greenwell
Washington State
USA