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0.530" diam arms in Rotor setups?


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#1 Paul C-S

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Posted 24 September 2023 - 03:51 PM

A number of 0.530 diam S16D's arms have come into my possesion. Do I shim a rotor setup or just run with a large air gap?

I have noted here that 16D arms like a bit of breathing space, but how much is too much?

Thanks in advance, PC-S


Paul Charlton-Smith




#2 Bill Seitz

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Posted 25 September 2023 - 05:09 PM

Standard diameter for 16D arms is .520. Some of the 16D setups with .150 thick magnets have enough room for at least a .540 arm and in some cases a .560. Personally, I don't like running a .520 arm in these setups, and opt for replacing the magnets to drop the "hole" down to .540. S16D's especially seem to like that. Otherwise, I run a larger diameter arm. So, if you have setups with .150 magnets and the larger "hole", running a .530 arm shouldn't be a problem. You'll get a little more torque and brakes.



#3 Danny Zona

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Posted 25 September 2023 - 05:56 PM

A number of 0.530 diam S16D's arms have come into my possesion. Do I shim a rotor setup or just run with a large air gap?
I have noted here that 16D arms like a bit of breathing space, but how much is too much?
Thanks in advance, PC-S

You can run them that way.

Back in the day I would use .518 arms with a .585 air gap.
  • Bucky likes this
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#4 Bill from NH

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Posted 25 September 2023 - 06:30 PM

And get gobs of RPMs Danny?


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#5 Danny Zona

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Posted 25 September 2023 - 07:38 PM

And get gobs of RPMs Danny?

Probably but I can't say for sure except the the lap times were faster.

I'll add most racers used higher timed arms from 45 to 50 degrees and I preferred 38 degree arms.

Also the big air gap motors with small arms used a smaller pinion.
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#6 Paul C-S

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Posted 29 September 2023 - 04:45 PM

Many thanks for your helpful comments. I measured the airgap in a new PS S16D motor at 32thou, so there you go. These motors should all run cooler if correctly geared I think.

My experience with newer motors is growing thanks to you guys and this forum.

PC-S


Paul Charlton-Smith





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