Upgrade to a Lehner... Which One?

[RC-Monster Mike]

Originally Posted by jhautz

So on 5s will I have a problem with heat with the 1950-7. Or am I better off playing it safe and going 1950-8. I just feel like the 8 will not get to 40 on 5s.

Either motor will easily reach 40-50 mph on 5s Lipo. Just a matter of gearing.

[jhautz]

So gearing up a 1950-8 will not cause excessive esc heat? The whole reason I want to upgrade is to avoid heat. I feel like Im constantly walking the line of to much heat in either the motor or esc.

On 5s (18.5v) the 1950-8 will only be spinning at around 30k rpm. The 1950-7 will be at about 35K rpm. Will I have a problem with the 1950-8 not hitting its sweetspot ''powerband'' at only 30K rpm?

Which of the 2 would be better for nice cool running and 40-45 mph but still have nice punch? Any sugested gearing for the 2 motors for 40-45 top end on 5s? I'm running a Gmaxx revo with an emaxx tranny and revo diffs and a Quark 125.

My calculations say that it would need to be arond 51/18-20 on the 1950-7, and 51/20-22 on the 1950-8 to reach 40-45mph on 5s. Does this sound reasonable?

[danverz]

Originally Posted by jhautz

My calculations say that it would need to be arond 51/18-20 on the 1950-7, and 51/20-22 on the 1950-8 to reach 40-45mph on 5s. Does this sound reasonable?

I can say yes, it is. I have a Emaxx with that 1950/8, UE diffs, gorilla single speed trasmission
and strobe with mod1 spur. I run 5S lipo. With a 18T pinion I stay under 54°C on the ESC and
the motor.
Its power is impressive, you can wheelie while running from over middle throttle without
problems. It's also very fast. Do not know exactly, but it seems to me to be able to reach
70, 80 km/h on bad terrain.

In my bashing yard, the 18T is perfect. But I think you can reach 100 km/h or something
like that with a 20T pinion without loosing in torque.

I love Lehner motor just because they do not get hot, and they also keep the esc
temperature more than reasonable. In my brushless experience, the thermalling problem
is at the top list of the iussue of this technology.

Ciao,
Daniele