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Old 03-17-2003, 08:42 PM
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Default servo: oz/in to pounds

Some other factors to consider are; factor of safety, dynamic loading, gear strength, and stiffness. A simple calculation based only on aerodynamic hinge moment will likely indicate you need undersized servos.

A simple relationship you might have been asking about is this: an 80 oz-in servo produces 80 ounces (5 lbs) of force in a pushrod. That's assuming the rod is attached 1 inch from the center. If it only 1/2 inch out, the force is 160 ounces. Put it two inches out and you get 40 oz.

You can easily generate high pushrod forces by putting the rod on an "inside" hole. Of course the rod won't move nearly as far.