diozxlive

iTrader: (3)

can i run the 6900 mamba on 3S lipos, limiting the RPM by adjusting the Throttle End Points on my transmitter? thanks...

geeunit1014

iTrader: (14)

I would not try it(although possible), there is still a great chance for failure. I would stick with the 5700 on 3s, its still wicked fast

Xtant3150c

iTrader: (10)

I would think it would be possible if you set your epa low enough?

Or if you are just going to run it for like 5 seconds or less at a time

Trips

iTrader: (16)

I'm not sure of the exact reason, but heli guys who fly brushless motors have found that limiting RPM by running less than around 80% throttle or so at the transmitter tends to get the speed control into thermal issues.

I believe it's something to do with the effiency going down at partial throttle settings, but I'm not certain of the exact reason. I do know that heli flyers tend to spool up to RPM and maintain it for the whole flight, while we're on and off the throttle constantly, so maybe it wouldn't even be an issue for us... I'd ask someone at Castle to be sure.

diozxlive

iTrader: (3)

thanks guys the car will be just for speedruns. i already have the Max and the 6900 and shipping thing in is quite hard these days for an additional 5700 motor.

Xtant3150c

iTrader: (10)

Another thing that you could do is put a fan (or two) on the esc.

geeunit1014

iTrader: (14)

Limiting the endpoint does cause a loss of effecincy, but it shouldnt be too much of a problem on the mamba max. The real issue he will run into with the 6900 and 3s is damaging the rotor from turning so many rpm's. If he was going to do it, id start with the timing all the way down and a small pinion/big spur to try to keep everything in check. another reason not to lower the endpoint is that it makes the throttle choppier and not as smooth.

rcracingzone

iTrader: (3)

www.nitrokillers.com - there are guy has run it but, you need to lower your pinion.