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Mini servos replacing standard.

Old 11-26-2005, 04:56 PM
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Edge 540
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Default Mini servos replacing standard.

I am currently using standard servos on some control surfaces. They are rated at ~43 oz of torque on 4.8v and are working fine. I would like to save some weight and go with mini servos such as the futaba s3101. They will be operating on 6 volts so I should get about the same torque as the others. What do you think about this switch? I am getting the same rated torque, just with less weight. Are mini servos with high torque a good replacement for standard servos?
I have plugged numbers into some of the on-line servo torque calculators and I am getting results that are about right. How much of a buffer would you give your servos? That is, how much more torque would you use if it said you needed X oz. 10% 20% more?
This is going to be used in a stol type of aircraft with mass balanced control surfaces.
Old 11-26-2005, 06:34 PM
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krayzc-RCU
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Default RE: Mini servos replacing standard.

i have quite a few people do it on planes that don't have flutter issues.... i myselft only use them on throttle. just becasue i have so few of them...
Old 11-27-2005, 12:39 AM
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smokingcrater
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Default RE: Mini servos replacing standard.

I have LOTS of micro servos in various planes... yes the rated torque might be high enough, but the geartrains of micro servos is very fragile when compared to a standard sized servo. think about it, you have the same torque going through gears with MUCH smaller teeth, something is going to break.
Old 11-27-2005, 04:02 PM
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Edge 540
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Default RE: Mini servos replacing standard.

Thats what I thought.
What about a mid size servo such as the hitec 225?
Old 11-27-2005, 08:38 PM
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krayzc-RCU
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Default RE: Mini servos replacing standard.

i use a few of those mg 225 on my throttle talk about fast. i have seen them used on a DP ultimate ailerons/

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