futaba servo question
02-07-2006, 06:57 PM
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futaba servo question
I have this servo wich was given to me can some one help with the torque and speed of this servo?
the servo is the FP-S128 inderect drive what does the inderect drive????do??? is this a strong servo or is it just like the 3003.
the servo is the FP-S128 inderect drive what does the inderect drive????do??? is this a strong servo or is it just like the 3003.
02-07-2006, 07:24 PM
#2
RE: futaba servo question
S128 torque is 48.7 oz, replaced by the S148 with 41.7 oz torque, replaced by the S3003 with 44.4 oz torque. The S128 was a bit taller than the S148 and S3003. All are indirect drive, meaning the motor drives a gear train to the output.
George
George
02-07-2006, 08:08 PM
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RE: futaba servo question
Actually, I think indirect drive refers to the potentiometer. Doesn't it? Maybe I'm wrong.
I thought that was the big difference between the 148 and 3003. 148 is indirect and 3003 is direct. This is why 3003 and 3004's are not suitable for helicopter use. The indirect drive of the 148 is better in that case.
I may be off... but that is what I have gathered from other threads.
Personally I have only taken apart the newer 3003's and the pot is definitely hard mounted to the end of the output shaft.
I thought that was the big difference between the 148 and 3003. 148 is indirect and 3003 is direct. This is why 3003 and 3004's are not suitable for helicopter use. The indirect drive of the 148 is better in that case.
I may be off... but that is what I have gathered from other threads.
Personally I have only taken apart the newer 3003's and the pot is definitely hard mounted to the end of the output shaft.
02-07-2006, 08:44 PM
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RE: futaba servo question
Edge 540,
When I think of indirect or direct drive, it means how the motor is driving the output (to me) but you could be correct as I have never seen any explanation by servo manufactures. As I recall, the 148 and 128 both had a small piece of plastic that was keyed to the output gear and attached to the pot. That would make the pot indirect drive, I guess, although I would still consider it direct drive from the output gear since it is directly below the output gear and follows the output gear in motion. Makes no difference to me as I don't fly helicopters anymore so I can use either type.
George
When I think of indirect or direct drive, it means how the motor is driving the output (to me) but you could be correct as I have never seen any explanation by servo manufactures. As I recall, the 148 and 128 both had a small piece of plastic that was keyed to the output gear and attached to the pot. That would make the pot indirect drive, I guess, although I would still consider it direct drive from the output gear since it is directly below the output gear and follows the output gear in motion. Makes no difference to me as I don't fly helicopters anymore so I can use either type.
George
05-27-2008, 11:02 PM
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RE: futaba servo question
ok so the futaba fp-s128 and fp-s148 are better suited for a heli then the fp-3003? this is what i am gathering from above info?
05-28-2008, 09:17 AM
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RE: futaba servo question
All servos have the motor drive a series of gears with the output shaft on the final gear. "Indirect" or "direct" drive, when used by Futaba, means that the servo potentiometer is either indirectly or directly connected to the final output gear. The direct drive servos would have the final output gear actually fixed to the shaft of the pot. The reference has nothing to do with the motor and gear train.
