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Futaba and Hitec output shafts, same or not?

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Old 07-08-2005, 09:47 PM
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dloftis
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Default Futaba and Hitec output shafts, same or not?

I'm trying to find out if I can use servo arms made for a hitec servo on a futaba servo... anybody know?
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Old 07-08-2005, 10:20 PM
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carrellh
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Default RE: Futaba and Hitec output shafts, same or not?

You cannot interchange the arms. One has more splines than the other even though they look identical. I'd offer to count the splines but my eyes don't like looking at really tiny stuff.
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Old 07-08-2005, 10:59 PM
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dloftis
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Default RE: Futaba and Hitec output shafts, same or not?

Thanks, that's what I was afraid of... but thanks for the response!
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Old 07-09-2005, 07:33 AM
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Default RE: Futaba and Hitec output shafts, same or not?

They are close, and my look and feel like they fit, but they will slip splines in flight. Don't risk a few hundred dollar airplane for a few cent servo arm.
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Old 07-09-2005, 08:17 AM
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Default RE: Futaba and Hitec output shafts, same or not?

I can verify that splines will slip. Fortunately the slip was discovered during testing and before flight. A spline slip during flight would be very bad.

Fortunately Futaba horns are a different color. It is harder to distinguish the difference between JR and Hitec horns.

I found Hitec, Hobbico and Tower horns to measure .220” across the diameter of the hole in the horn and to have numbers on the horn. JR horns measure .233” to .235” and do not have numbers. Someone else might be able to verify my findings.

Bill
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Old 07-09-2005, 11:57 AM
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Rodney
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Default RE: Futaba and Hitec output shafts, same or not?

All my Hitec and all my Futaba horns are black. Yes they are different, Futaba has an odd number of splines (a nice advantage) and Hitec has an even number. With the odd numbered splines, you can get a finer resolution on changing arm positions, if you notice Futaba horns have numbered segments and if you turn them 180 degrees the horns will be a slightly different mechanical neautral than before. You can buy aftermarket horns though at most hobby shops, just be sure they are for the brand servo you are using. I believe DuBro makes them but am not sure.
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Old 07-11-2005, 04:48 PM
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BillS
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Default RE: Futaba and Hitec output shafts, same or not?

my Hitec and all my Futaba horns are black.
Rodney I don’t want to appear rude but are you sure your Hitec horns are black? I have looked at all my Hitec servos and the horns are white.

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Old 07-12-2005, 01:36 AM
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Default RE: Futaba and Hitec output shafts, same or not?

Depends on what Hitec servo. Mine come with a multicolored pack of white/black and red ones. Even the digitals that come with a blue aluminum one come with the multi-pack that are white/black and some red.
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Old 07-12-2005, 09:24 AM
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Rodney
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Default RE: Futaba and Hitec output shafts, same or not?

Bills, I apologize, you are correct, most of my Hitec servo arms are white, the black ones were some special order high strength ones. Sorry for my poor memory.
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Old 07-18-2005, 04:36 AM
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fiery
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Default RE: Futaba and Hitec output shafts, same or not?

I have found that current standard JR and Airtronics/Sanwa servo horns are compatible and therefore fully interchangeable. They have the same spline pattern and dimensions.

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Old 07-18-2005, 06:16 PM
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Default RE: Futaba and Hitec output shafts, same or not?

the DUBRO aftermarket HD servo horns are white for Hitec and Black for Futaba....
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Old 07-18-2005, 09:04 PM
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Default RE: Futaba and Hitec output shafts, same or not?

And grey for JR....Jim
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