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Old 12-04-2011, 02:28 PM
Join Date: Nov 2005
Location: Auckland, NEW ZEALAND
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Default RE: servo arm length vs torque rating

Rodney is right, you will loose no torque whatever length arm you use, but Torque is a product of a Force times a Distance. (T=FxD).
So for your 200 oz.in servo, that is 200 oz of force at a distance of 1 inch from the axis, will be a force of 100 oz at 2", 50 oz at 4" etc. Or 400 oz at 1/2 inch. etc. This is the force delivered then to the controlled surface horn. As to how you arrange the arm/horn length to get the surface movement you want that is entirely up to the operator, but using 100% of the servo movement is always preferable, modern computer radios have not removed the need to set up the mechanical part of the system with the usual care.
Evan, WB #12.