where can i find a servo that responds to velocity input, rather than position? i'm going to use it in a gimbal that wont be used for piloting the aircraft, so i don't need/want the camera to return to center every time i let go of the stick. would a sailboat winch servo work?

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A 360 servo popular with the RC aerial photography community is http://lynxmotion.com/Product.aspx?productID=429&CategoryID= The more you move the stick, the faster it goes, center is stop. Usually coupled with http://www.lynxmotion.com/Product.aspx?productID=332&CategoryID=75 with belts and larger pulleys from http://www.sdp-si.com/

Some use different gear ratios with gears from http://servocity.com/html/gears___sprockets.html

Troy
beautiful. just what i was looking for thanks!
i want ti knew how to fonction a a sevro gimbal (applications in flight space)
You may as well take a look at modifications you may do to a regular servo for 360 degree rotation:
one possible link.
Another link.
A last link.

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