3500 RPM per volt motor ?
 

I have noticed on a well known auction site :eek: 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 ?

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.

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

RE: 3500 RPM per volt motor ?
 

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

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.