I have made a balsa glider with following specification:
Aerofoil : Clark X
Dihedral Wing (2m)
Pusher Configuration .
Rudder and Elevator
I m facing a problem of thrust torque , As I increase throttle, bird goes leftwards . So to correct this i trimmed my rudder to rightwards . Now it goes straight in power but as i off the throttle , Bird turns to rightward .And the problem is i have to change its rudder trim according to the throttle level.Kindly suggest me how can i reduce the motor torque effect on my bird.
Regards
Viky
Replies
I think i can change the motor mounting angle to left or rightwards to make the thrust line straight with straight rudder.
Two solutions that will work.
1 Easy to do. Use a mixer to feed in rudder correction with throttle input. Only problem is that the torque is not linear with throttle stick position.
2 This is harder to do depending on how the motor is mounted. Shim the motor to make the thrust line push the plane to the right as power is applied. Start at about 2 to 3 degrees right thrust and try it without the rudder correction. Increase or decrease as necessary. It should work well over a range of throttle settings.
Let us know how it works.
Some reading:
http://www.wattflyer.com/forums/showthread.php?t=63900
http://www.aerospaceweb.org/question/dynamics/q0015a.shtml
http://www.southernskies.net/page_info/primary_propeller_forces.htm
http://www.rcgroups.com/forums/showthread.php?t=386707
http://curiad.hubpages.com/hub/Aviation-Facts-How-Torque-P-factor-a...