Sport cub s not turning properly
09-20-2018, 04:10 PM
#1
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Join Date: Jun 2011
Location: Manchester, CT
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Sport cub s not turning properly
Hello,
My sport cub s is not turning properly. When I turn the safe system off (expert mode) and I turn its as if the rudder is turning in the opposite direction (I am not using any rudder) and fighting my turn so much that it seems to turn the opposite direction sometimes. I checked all the control surfaces and they are going the correct direction. I'm fairly sure it's not a trim issue because it does it in both directions.and it's flown fine previously. I think as3x is messed up or something. It flies fine in beginner mode though.
Some preface: I have flown this plane a lot before and it flew fine so its not me. The last time I flew it was with my wife and we used two controllers (buddy box) however she ended up crashing nose first into the ground. The only damage was the engine mount which I re-glued and all was good to go. This was my first flight since and it was just me.
Any ideas? I have flown other planes with no issues (umx Trojan, apprentice mini, Cherokee) so it isn't just me. It really seems like the rudder is going the opposite direction (there is no mixing and it doesn't do anything strange on the ground)
Thanks!
My sport cub s is not turning properly. When I turn the safe system off (expert mode) and I turn its as if the rudder is turning in the opposite direction (I am not using any rudder) and fighting my turn so much that it seems to turn the opposite direction sometimes. I checked all the control surfaces and they are going the correct direction. I'm fairly sure it's not a trim issue because it does it in both directions.and it's flown fine previously. I think as3x is messed up or something. It flies fine in beginner mode though.
Some preface: I have flown this plane a lot before and it flew fine so its not me. The last time I flew it was with my wife and we used two controllers (buddy box) however she ended up crashing nose first into the ground. The only damage was the engine mount which I re-glued and all was good to go. This was my first flight since and it was just me.
Any ideas? I have flown other planes with no issues (umx Trojan, apprentice mini, Cherokee) so it isn't just me. It really seems like the rudder is going the opposite direction (there is no mixing and it doesn't do anything strange on the ground)
Thanks!
Last edited by brendon7358; 09-20-2018 at 04:14 PM.
09-20-2018, 06:42 PM
#2
It sounds like it either has no aileron differential or maybe even reverse differential. Without differential the aileron moving downward creates more drag then the aileron moving upward. The result is a yaw opposite direction of applied aileron. The Safe system was automatically putting in a rudder command to counteract this.
09-21-2018, 06:02 AM
#3
Yes, it is adverse yaw. You need to use rudder along with aileron with a Cub. I believe it was Garry Yarrish inModel Airplane News who did an excellent article on this a few years ago. He explained why this happens with planes like a Piper Cub
