FUT S9156 and S9157 Servos
12-06-2009, 08:25 PM
#1
FUT S9156 and S9157 Servos
The info on the Futaba S9157 servo does not include any specs for 4.8 V .... only for 6 V. I will be using a regulator/powerbox which delivers 5.1 V. Does the S9157 need 6 V ? This servo is also labeled as 'New' on the Futaba website. Wondering if any problems with it have surfaced ? I was planning to just go with the S9156 ..... until I saw the S9157. Thanks. Bob
12-07-2009, 08:03 AM
#2
Senior Member
Join Date: Dec 2004
Location: Naersnes, NORWAY
Posts: 912
Likes: 0
Received 0 Likes
on
0 Posts
RE: FUT S9156 and S9157 Servos
Both have same "operating voltage", although there are no specs to be found for 4,8V on the 9157. I doubt it MUST have 6 Volt 
12-07-2009, 09:19 AM
#3
My Feedback: (309)
Join Date: Jan 2002
Location: Loveland,
CO
Posts: 1,682
Likes: 0
Received 0 Likes
on
0 Posts
RE: FUT S9156 and S9157 Servos
Higher voltage = higher torque and faster speed.
Why do you want a high torque servo, only to weaken it (and slow the speed) with lower voltage?
I suspect Futaba didn't give a 4.8v spec because they didn't expect anyone to use these servos at lower than 6v.
You should use 6v.
I don't know which regulator/powerbox you're talking about, but maybe you're confused. A powerbox usually regulates voltage to the rx to about 5v, but supplies high voltage to the servos.
Jim
Why do you want a high torque servo, only to weaken it (and slow the speed) with lower voltage?
I suspect Futaba didn't give a 4.8v spec because they didn't expect anyone to use these servos at lower than 6v.
You should use 6v.
I don't know which regulator/powerbox you're talking about, but maybe you're confused. A powerbox usually regulates voltage to the rx to about 5v, but supplies high voltage to the servos.
Jim
12-07-2009, 03:29 PM
#4
My Feedback: (3)
Join Date: Jun 2005
Location: ft lupton,
CO
Posts: 895
Likes: 0
Received 0 Likes
on
0 Posts
RE: FUT S9156 and S9157 Servos
I agree with Jim. No reason not to run them at higher voltages. I think Futaba servos are hard to beat. I'm running the 9156's on one plane and they're super smooth.
