Quote:
Originally Posted by jordan...
Patrick: I'm from Perth as well 
so would the 1940/7 be able to handle 6s pretty easily? |
I run the 1940/7 on 5s and it is very happy. This is in a big Savage as well. I think that motor on 6s would be a bit much. If I had the choice from the list you made below I would go for the 1950/7 on the 6s in a monster truk or truggy. It sounds like you will be running this in a truck of some sort. The slightly bigger 1950 will be happier in the heavier vehicle. For a buggy the 1940 would be a perfect choice but on 6s I would go for something more like a 1940/9. You really dont need to push these motors that hard to get them to make power. Another thing to keep in mind is that the Lehners give loaded kv values while almost all other manufactureres are giving unloaded kv values. so I tend to add +15 or 20% to the kv that Lehner lists when comparing the kv to other brand motors. And I also use the kv rating from
http://www.lehner-motoren.com/ms19.php?la=en rather than from the speed calulator. I know there used to be some discrepancy in the kv on the calculator, I'm not sure if thats fixed or not.
Like Patrick says, you can use the rcm heatsink, but you cant put the bar across the back so it doesnt act as a clamp, and in reality it doesnt neeed the heatsink. The lehners run cool enough without it.