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BrianG · 03.20.2009, 08:33 PM

IMO, 42k rpm isn't really that high on a quality motor. The good motors are rated up to 50-60k rpm. Of course we shouldn't run them near that high, but 42k is only 70% of the 60k max, so it should be just fine. And true, the efficiency of an unloaded (or very lightly loaded motor) isn't great, but in a vehicle geared for anything over 14mph, it should be more than enough load. Besides, that 42k rpm is probably using the unloaded kv, so it will drop the more current you pull.

It's one thing if you were doing speed runs only hitting WOT all the time because it was geared so low, but on a track, the throttle is mostly somewhere in between slow and WOT.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	03.20.2009, 08:33 PM IMO, 42k rpm isn't really that high on a quality motor. The good motors are rated up to 50-60k rpm. Of course we shouldn't run them near that high, but 42k is only 70% of the 60k max, so it should be just fine. And true, the efficiency of an unloaded (or very lightly loaded motor) isn't great, but in a vehicle geared for anything over 14mph, it should be more than enough load. Besides, that 42k rpm is probably using the unloaded kv, so it will drop the more current you pull. It's one thing if you were doing speed runs only hitting WOT all the time because it was geared so low, but on a track, the throttle is mostly somewhere in between slow and WOT.