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Originally Posted by BrianG
10mm shorter in length and smaller shaft (3.175mm vs 4mm on the 1950) according to the LMT website...
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The shaft on a 1940 is 4mm. Other than that its a little shorter than the 1950. The 1940 is PLENTY of motor for a maxx. I really love mine in my maxx. Its actually my favorite maxx motor right now. If you can swing it go for the Lehner 1940. Totally worth it IMO.
The BK controllers have a great braking/reverse setup. But the quark is the smoothest. Not a huge difference though. I have not tryed a MGM... (still on the to do list someday) so Im not sure how that compares
The 9920 will handle 20 cell or 6s Lipo. The Quark is rated for 6s, but doesnt really do well with it IMO. 17cells or 5s is about its limit. It starts to get weird cogging issues at 6s. Not an issue if you are looking at 16cells or 5s max.
The MGMs with the newest software are supposed to be great. They runn the 4 poll Neus just like Quark from what I hear. They also had that weird braking blip fixxed.