Thread: Discussion diamond 2500 from art tech
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Old Dec 31, 2012, 08:45 PM
TooSLow2Care is offline
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Joined Aug 2006
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Tip stalls are caused solely by airspeed (or lack there of).
When we use the example of a left hand gliding turn:
The right wing accelerates or remains at a constant velocity; increasing or maintaining it's lift characteristics from straight and level flight.
The left wing decellerates to a point that all lift is lost on that wing. The longer the wings, the greater the difference in velocity. With our 2.5Meter wingspan this differential is very great vs. a smaller 1.2M glider. The tighter the turn, the more exacerbated this behavior presents it's self.

To prevent tip stalling in a turn, as you initiate you turns with rudder only, give a touch of down elevator to accelerate the sailplane slightly, thus keeping the inside wing at a constant velocity. The outside wing will accelerate by the down elevator input along with the difference in turning radius, so a small amount of right aileron can be input to coordinate your turnand keep the wings a bit more level. This will maintain your vertical lift and prevent a side-slip loss of altitude. This right aileron input (cross sticking) is spoiling the lift of the outer wing slightly deducing it's lift to match more closely the inner wing.

Cheers,
Brian
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