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-   -   FP S128 Voltage Limit (https://www.rcuniverse.com/forum/futaba-radios-direct-support-forum-125/9829477-fp-s128-voltage-limit.html)

RCPtero 06-27-2010 08:00 AM

FP S128 Voltage Limit
 
Hi! I'm assembling an Ultra Stick 40 ARF. I'm planing on using a switching BEC to supply the RX with 6.0v. I have an old Futaba FP S128 servo I was looking to use on the throttle. Can I drive the S128 at 6.0v? Or do I need to drop it down to 4.8v? I've looked on the web, but can't seem to find any specs that speak to the voltage requirements for this servo.


Tom

Krysta 06-28-2010 09:00 AM

RE: FP S128 Voltage Limit
 
The S128 servo will be fine at 6 volts as long as it's regulated.


Sincerely,
Krysta
Product Development & Support Specialist
Futaba Service Center USA
[email protected]

RCPtero 06-28-2010 06:01 PM

RE: FP S128 Voltage Limit
 
Thanks much!!

Creative RC 09-09-2021 05:00 AM

I know this is old, but I bought a plane that has 3 of these old FP-S128 servos and was wondering whether they could run on 6.0 volts. The fellow I bought it from had just recently installed a UBEC and set it at 6 volts. They seem to be working fine.

I found an instruction manual online for the Futaba FP-2GS transmitter which comes with two of these servos. See photo below.

The servo specs say the power requirements are 4.8V - 6V. Since it mentions current drain at 6.0V, I assume the torque of 48.7 oz-in and the speed of .24 sec/60 degrees are also at 6.0V, although it does not specifically state that.

https://cimg2.ibsrv.net/gimg/www.rcu...29e0505215.jpg

FUTABA-RC 09-09-2021 06:48 AM

That servo as stated above in this tread are fine on 6 volts as long as it is regulated voltage. The speed and torque shown are at 4.8 volts. Both will be faster/higher at 6 volts, but not hugely faster/higher.


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