Quote from: abhay1290 on January 04, 2011, 08:34:36 PM
Thanks a lot buddies...

But i think that only a fraction of force can be altered by horns balancing, and even a small torque is sufficient to turn rudder or elevator even during flight, but the thing is the CG should lie at the center of wing, and elevator and rudder should be there only to balance the direction. However, lesser the torque,longer the time to make the desired turn during flight.
Though my theory may not prove to be fruitful for stunt planes or 3D , but this can be considered while making a glider or a slow flier during lack of resources.

But i agree with the fact that torque should be double the overall weight for quick and effective response.

anand sir me too, 

At the center of wing means..
Let me specify,
I mean to say that at the centre of the main wing which carries the whole weight of the plane...
hope you understood.
this CG will act as a fulcrum,on which it is balanced like a conventional weighing pan. Thus the plane is ready to lift is nose up and simultaneously tail doun and vice versa, even at little air friction due to movement of elevator during flight.
same goes for rudder, though its not as effective as the elevator..

Quote from: abhay1290 on January 07, 2011, 01:27:54 AM
At the center of wing means..

The CG in most model planes lies at 30 - 35% of the mean chord. "Centre" would imply 50%, which would be very tail heavy. But yes, a rearward CG WOULD increase pitch sensitivity. If excessive then you would get instability and your first flight could well be the last!

And abhay, the movement of an aircraft (in any axis) is not due to air friction.

abhay read this

http://www.rcindia.org/beginners-zone/basic-aerodynamics-for-rc-flying/ and

http://www.rcindia.org/rc-general-topics/aerodynamics-is-this-possible/new/#new

understand, on ground the fuselage supports the wing, in air it is vice-versa, understand the force couples, see the illustrations, any query, ? gimme a holler