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Atom 500 Compass Atom 500 Model Helicopter Discussion


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Old 05-27-2017, 04:47 AM   #1 (permalink)
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Default Maximum head speed?

In my notes I have 2800 for maximum head speed on my Atom, however I was wondering if anybody has gone higher than that?
Currently I have a 9t pinion running 2700, but I feel like there's more power there if I can get the head speed up some more.
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Old 05-27-2017, 02:50 PM   #2 (permalink)
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Default Maximum head speed?

Well over 3k. This video was of Tony Whiteside a couple of years ago. I think he might have run 8 cells.
Tony Whiteside Atom 500.... How much headspeed will it handle!? 2012 Heli Invasion (1 min 12 sec)
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Old 05-28-2017, 01:49 AM   #3 (permalink)
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2700 governed is plenty of power for the atom. I think you are not running the governor?

9T is insufficient for governor @2700. You will need a 10T pinion for sure.
10T governed at 2700 looks like the sweet spot for atom for me.

What lipo packs are you using? Are they good enough?
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Old 05-28-2017, 02:33 AM   #4 (permalink)
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Thanks! I was using the IKon gov.
While I was setting up the end points in the software I saw that I had an unloaded rpm max of 2770. I know that is not the true max based on the math but it make me aware that I should not run much over 2650 max for long (just a few moments in flight) so as not to stress the esc.
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Old 05-28-2017, 02:31 PM   #5 (permalink)
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Looks like your Atom got sold in a jiffy. What heli are you moving to next?
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Old 05-29-2017, 09:39 AM   #6 (permalink)
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Compass was quite conservative in offering the 9T pinion as standard for the 500 and the 8T as standard for the 5.5 upgrade.

I always used the 10T for the 500 size, and the 9T for the 5.5, both governed, with excellent results. But I think that even in ungoverned (throttle curves) operation, I'd keep this pinion setup. The standard setup given by Compass is just too tame.

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Old 05-31-2017, 01:15 PM   #7 (permalink)
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I run about 2700 RPM on the stock Atom.

I never tached the stretched one, but it was definitely lower (smaller pinion driving a larger disk).
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Old 05-31-2017, 01:17 PM   #8 (permalink)
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I once ran mine at 3k. It was a bit crazy.
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