Light Plane Philosopher
- Dec 16, 2007
- Port Townsend WA
What about accelerations in yaw? The balance weight below the hinge line will see more effect from a cyclical yaw from nose wheel shimmy or something.Static balancing is done to have an opposing torque at the hinge line when the hinge is accelerated. That can be accomplished with the weight not in the plane of the hinge and the aileron C.G.
Consider a free body diagram, with a pivot point, a point mass behind it, and a point mass forward at a distance that produces a torque on the hinge equal to the torque from the aileron mass. That condition is statically balanced.
Now accelerate the hinge upward at, for example, 2g. The aileron point mass will generate an inertial force that will try to rotate the aileron to deflect down, (mass X 2g X arm = torque). The balance weight will also be accelerated upward at 2g, and it’s inertial force will produce a torque equal to the aileron’s, but in the opposite direction.