Futaba S9650 Servo

I was looking at various servos online for a sail servo for my Footy, and found the Futaba S9650 Digital Mini Servo

Weight: 0.9oz (26g) 
        SPEED: .14 sec/60deg @ 4.8V                  .11 sec/60deg @ 6.0V           

TORQUE:50 oz-in @ 4.8V, 62.5 oz-in @ 6.0V

It also says NOT to use it with an AM radio, but I have no idea why, except for RF interference?

Myth or fact: digital servos get really warm or hot, so you need a heatsink and can’t use them in an enclosed area (boat)

The digital servos are more expensive than the standard ones. The have more torque (sometimes) but also use more energy from the battery. The most popular reason for using digital is their presision in re-centering themselves, but you need to be using a good FM or Spektrum computer radio. That is good for airplanes, but not important in the sailboat winch use.

Look at the Hitec HS225bb as an alternative. ball bearing, .27g weight, 54 oz/in torque at 4.8v. AND it is only about $20!!

That looks like a good servo for a Footy sailwinch, but why not use a standard servo, like you’r supposed to? At least a standard-size servo for looks, in case somebody want to see what’s in there, but you could get a higher-torque servo for personal use.


Hi Tomo,

A quick reminder so nobody gets mislead…servos are not regulated by the Footy rules, so any type of servo can be used in competition.

Bill H

I think that we mostly agreed to stick with the standard servos that you get in your basic AM r/c system, so people won’t get too intimidated with that. The same as with the batteries used to power the radio.

I’m planing on having one of each; a high-torque servo for personal use, and a standard servo as a stady or for if & when it’s needed.

There is some difficulty finding a high-torque servo of the same size as a standard, that’s not a whole lot more expensive.

What would you consider to be “high-torque?” YThe standard servo is about 45 oz-in, so high torque would be about 90 or 95+ oz-in?