Servo winch question

[The Doc]

I'm trying to figure out what oz servo to use on a 6 to 10 lb rig. I have a 130oz and my friend says thats good enough, is it. I would think a bigger oz would be better and don't ask me why, thats just what I think. I see people talking about the 645 but I have not had good luck with that one, and its about 130.

[666]

Get a Hitec 5955, 7955, 7950, or 7980. No such thing as overkill!

[benoj]

of course more oz is better as it will pull the weight easier. ive used one with only 80oz and it would out pull a 3r winch. if the servo is cheap try it and see if it will do the job. currently on one scaler that had lots of room up front i put a 1/4 scale servo with 340oz at 6v for a winch in it but its running off 3s lipo and will brea hd winch line before it breaks a sweat

[The Doc]

Thanks guys, I thought go bigger. What the hell doe's my friend know I have only ran 1 servo winch in all the rigs I have had.

Thanks.

[meatmonkey]

The torque requirements of the servo depends on your desired pull speed.

The diameter of your winch spool makes a big difference in line speed and the servo's leverage. A small spool will allow a weaker servo to do the job, although with a much slower line speed. If you need more line speed you want a larger drum, which requires a stronger servo.

I'd consider a 645 the bare minimun with about a 1/2" spool. Lighter rigs can get away with a 9/16" spool.