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3500 RPM per volt motor ?

Old 08-16-2006, 09:56 AM
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ghost123uk
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Default 3500 RPM per volt motor ?


I have noticed on a well known auction site an outrunner motor listed as being 8 - 20 amp and 3500 RPM per volt and suitable for use with a 3S LiPo

Does this really mean that this motor will spin over 38000 rpm with a 3S LiPo ?
Old 08-16-2006, 01:15 PM
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jooNorway
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Default RE: 3500 RPM per volt motor ?

Unloaded yes.
There are motors with even higher kV-numbers out there. Meant for either gearbokes or for Ducted Fans.
The AXI 1215/9 has kV 6370... for Alfa DF.
Old 08-16-2006, 03:21 PM
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superjim
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Default RE: 3500 RPM per volt motor ?

That's interesting. Would that go well on an F27 Stryker?

Ghost123 - could you post the link to that motor?

Cheers,
Jim
Old 08-17-2006, 03:26 AM
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ghost123uk
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Default RE: 3500 RPM per volt motor ?

ORIGINAL: superjim

That's interesting. Would that go well on an F27 Stryker?

Ghost123 - could you post the link to that motor?

Cheers,
Jim
eBay item number = 140017386790

In HK but I have dealt with this company a couple of times - all ok

I am trying to find out the pro's and cons of RPM per volt differences.

The motor I just bought for my electric converted 39" light wieght Herr Extra is 1100 RPM per volt at up to 20A with 30A ESC and a 2200mAh 12C 3S LiPo and for now I have fitted a smaller than recomended 8x6. Not yet flown but feels about right and pulls only 10A wfo.

Comments invited re rpm ratings and prop choice etc
Old 08-19-2006, 03:44 AM
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jooNorway
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Default RE: 3500 RPM per volt motor ?

kV-numbers:

For DF, pylon etc you need high numbers, like 3000 or more. These motors also works in gearboxes for ordinary use in planes.

For sport/acro/pattern a medium kV number is good. Here you want to spin a "small" diameter propell with high pitch to get the speed needed.

For 3D and large sailplanes turning a large diameter propell on low RPM a low kV-Number is suited. 300-700 typically.

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