RCU Forums - View Single Post - TuffFlight Panther "Tuck Under" Flight Problem
Old 10-25-2004 | 12:22 PM
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Montague
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From: Laurel, MD,
Default RE: TuffFlight Panther "Tuck Under" Flight Problem

Yeah, though I'm not so sure it's the side-to-side forces that cause that so much as the effectiveness of various surfaces changing at different rates as AOA increases. So at high speed, a little thrustline or rudder trim is not an issue, or cancelled out by the ailerons, but at high AOA, the rudder seems to matter more. I'll also say that my scale planes, with the smaller vertical stab area seem to be more prone to this than the open ships with lots of vertical fin. On some planes, I've gone so far as to stick some music wire in the fin horzontally to allow me to bend in some rudder trim and have it stay there. A little right trim seems to really help.

If you can increase your vertical area, or add some sub-fin, that might also help.

You really know you have the problem if your plane likes to slew to the left on launch. That plus the tuck in the turn is my signal to apply some right rudder trim.