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I hava a EF 100cc Yak and have found it requires considerable "right rudder" trim to sustain true vertical up lines. Interestingly, I have the "right" trim mixed out at low throttle for straight down lines. Also, I have a simular throttle/elevator trim; a small amount of "down elevator" at low throttle neutral in the middle range and a little more down elevator at full throttle. I have a DA100L on Grieves pipes with a Mej. 25/12 three blade prop. I'm not sure changing the engine thrust angle would work as well as the mixes. I also noticed there seems to be a much more pronounced tendency to pull to the left (requiring more right rudder) when transitioning into an up line at full throttle as opposed to feeding in throttle gradually during the transition. As the plane slows during a "Stall Turn" , it would immediatly start turning to the right until I mixed out the "right rudder trim" at low throttle. It seems complicated, but it works. |
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I have a flight mode set just for the hammerhead stall turn - all of the rudder to ail and rudder to elev mixes are both turned off. On the downline I usually flip the FM switch back to normal flying with the rud to ail * ele mixing on.
Bobby aka TDD