medusa 70mm 2000kv wooooott!!! - RC-Monster Forums

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.

e-mike · 03.20.2009, 08:57 PM

next time i will try to gear up....so its the first time that ive seen a motor that ive proble to set-up correctly....

littlegiant · 03.26.2009, 05:09 AM

Quote:

Originally Posted by e-mike

next time i will try to gear up....so its the first time that ive seen a motor that ive proble to set-up correctly....

I see that you used the lowest timing for the medusa. As far as I know 4 pole motors aren't efficient at that kind of timing and they heat up quite a bit. Try increasing the timing. Head over to e-savage.com and look out for Kostaktinos_mt. He is very knowledgeable when it comes to motor efficiency.

Your motor was probably spinning too fast. There is a range of rpms which the motor will operate at its max efficiency. Check with medusa and gear it accordingly.

I am very interested in getting a 70mm medusa too. Do drop me a note on how the motor performs when u get your motor back. :D