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#11
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Chris OCallaghan wrote:
This is an interesting case. I haven't really thought this through since stalling is difficult in most properly balanced sailplanes at high angles of bank. A long wingspan adds yet another aggrevator. But your speed is higher in a steep turn, thus the vertical stabilizer is more efficient. And right off hand I can think of several outcomes that would look like spins, but are, in fact, something else. Think of a wing over, for example. If you shot the initial 90 degrees of turn after apex, it would look very much like a spin entry. Nonetheless, I haven't tried a stall from a coordinated steep turn, with controls crossed and the yaw string straight. And I won't have a chance for another month or so... Perhaps, for the time being, I need to ammend my position to say that a spin is unlikely in most sailplanes if the ailerons and rudder are neutralized. In the meantime, if you have a chance to repeat, see if the instructor will let the "spin" develop. I'm interested to see if it is really a spin (I think the chances are good, though, if the controls stay crossed). Try it again, but at entry, center the ailerons and rudder, but leave the stick back. That is, add no further aggrevation after the stall break and see what it does. By the way, how rapid was the autorotation at stall break? How much change in direction did you experience before rolling back to level? How much altitude did you lose, if you took notice? And was there anything unusual about this particular 25? There was nothing unusual about this 25, only about myself. It was my first flight in the ship, I had a very low experience at this time ( 100 hours) and had only flown ASK21 and ASK23. This happened twice in the day at a low bank angle. There was almost no autorotation or change in direction. It was rather the feeling that increasing outside stick could no more counter the overbanking tendancy, but rather increased it, that made me realize that the inner wing was stalled and the I had to quickly release back pressure to avoid some mess, so nothing wrong happened before immediate recovery. My propension to low speed flight came from my familiarity with the ASK23 whose wing loading is much lower, and from the fact that it was a weak day where low speed rather than high bank angles helps to remain close to the core of thermals, at least in the ASK23 I was usually flying. It was my first attempt to make a flight longer than 5 hours, I felt it was better to try it first with an instructor behind me and in a glider in which this may be achieved even in unfavorable weather. This last point turned out to be true, all other gliders were in the hangars when we landed at the end of the day and the duration was effectively over 5 hours. However I had to wait another season before getting my silver duration, but this is another story. BTW I cannot try what you suggest since this 25 is no more in my club, nor any other club 25 (but 2 private ones) and the instructor in such a repeat attempt would probably be myself as I got this rating during last September. |
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