Have some LMT questions... - RC-Monster Forums

jhautz · 02.16.2008, 04:45 AM

I find with the Lehners, geared properly, they are very happy running around 40K rpm. Pick a kv that will get you around there on the voltage you want to run.

The Hi-Amp versions have 3 wires coming out the back of the motor instead of the 3.5mm sockets that the standard motors have on the back. If you you have a choice get the Hi-Amp IMO. Much more robust setup.

The plus side of a standard (non Hi-Amp) Lehenr is that the can be switched back and forth between Delta and Wye configuration by changing some solder paths on the back of the motor to run 2 different KVs. Kinda cool, but I still think the Hi-Amp is a more robust design. I actually solder wires into the 3.5mm sockets on the back of the standard motor so I can get rid of the 3.5mm sockets and run 5mm connectors on the ends of the short wires. 3.5mm connectors have no place in a high power set up.

I would pass on the new cooling versions. Its designed for airplanes and helis. It would probably just suck a bunch of dirt into the motor in truck use. Besides... If you run a reasonable rpm and gear it properly they run plenty cool.

jordan... · 04:52 AM

hmm... good point on those cooling fans sucking all sorts of whatever into the motor jhautz. Also, what would be a good operating current to enter for the motor, i'm planning on running 30C lipos btw

Has anyone back to back tested a Neu and a Lehner before, any opinions on each of these?

jhautz · 02.16.2008, 04:59 AM

I have both and I think that both are excellent. you wont be disapointed with either one. If you are in the US go with the Neu just for service reasons in case you ever need it. Not to mention they are much easier to get here as well. Price is similar, but I think Neu is a few bucks cheaper too.

Only reason I would recomend the Lehner is if you want a slightly smaller diameter motor (lehner is 36mm and Neu is 40mm) or if you want to run it with a controller that doesnt like 4+ pole motors.

jordan... · 02.16.2008, 05:53 AM

Well im in Australia so i don't think location makes a huge difference

If the LMT motors are 36mm that means that they can be used with the RCM heatsink right? Is anyone using a LMT with a RCM heatsink? If so, what length sink do you use? (eg. XL, L etc.)

lastly, i entered:

22.2 volts, 60 amperes and 40,000 rpm, into the motor chooser and got a 1950/7

22.2 volts, 60 amperes and 50,000 rpm, into the motor chooser and got a 1940/7

22.2 volts, 60 amperes and 60,000 rpm, into the motor chooser and got a 1930/8

i'm not too sure what seems to be the best option

Do the rpm's make a big difference in performance, both acceleration and speed, and also efficiancy

thanks
jordan