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Glider Thrust Torque Problem

Posted by Vikram on June 13, 2012 at 11:46pm

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

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Replies

Vikram June 15, 2012 at 2:31am

Thanks for info , i will be very glad to you , kindly send me that measuring procedure . It may help me a lot .
Vikram June 14, 2012 at 1:33am

Is there anyway to check the thrust line of my bird, Can i hang my Bird on CG and check the thrust line by applying throttle, so in the direction nose is turning that may be my thrust line . Or is there any other way to check this factor .
I think i can change the motor mounting angle to left or rightwards to make the thrust line straight with straight rudder.
gadgetfan2 June 14, 2012 at 1:02am

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.
Moderator

Michael Pursifull June 13, 2012 at 11:59pm

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...