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        Discussion Futaba FP-S25 Sail winch

#1 Usagi_Chan Jun 12, 2008 10:14 PM

Futaba FP-S25 Sail winch
I have an EC-12 which I just bought and it has this servo in it to control jib tweaking. On the servo are these markings:

Sail Servo

The wires are cut off and I suspect that it's burned out. I would like to replace it. I've searched many sites that have servo specs but this one is not listed in any of them. Does anyone have an idea what the specs for this are? Torque? Travel?


#2 Ed Morales Jun 12, 2008 10:49 PM

that must be a futaba s125, discontinued, replaced by the futaba s3802.

#3 Usagi_Chan Jun 13, 2008 02:45 AM


I did just find it in Futaba's discontinued list here:

They say the replacement is a 3801 but your suggestion does actually seem closer in torque values.


#4 Ed Morales Jun 13, 2008 03:00 AM

3801 is bigger in dimensions as well as torque output. the 3802 is the replacement for the s125. i have all three of these sail servos. the s125 has a square output shaft so you need square holed servo arms, while the 3802 has the splined ones.

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