Alex Perry wrote: > I've never noticed it, but that doesn't mean it doesn't happen. For > most throttle transients, the combination of prop momentum, throttle > pump and induction system effects will hide the blade stall > transition. Especially true if you have a controllable prop. > > Have you checked whether the blade profile implies that the whole > blade stalls and unstalls at the same time ? It may be gradual.
It is gradual. In fact, if you think about it, it has to be. A propeller that presented the same AoA at every point along the blade would have to change its degree of twist as the advance ratio changed. I didn't mean to imply that YASim is actually modelling the airflow around the propeller; it doesn't. What it does do is try to mimick an "idealized" propeller torque and efficiency curves (functions of the advance ratio). These have a "kink" at some point -- they don't continue to increase as the advance ratio drops to zero, because the blades reach an AoA of maximum lift. Andy -- Andrew J. Ross NextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com "Men go crazy in conflagrations. They only get better one by one." - Sting (misquoted) _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
