Quote:
Originally Posted by Tom F
...I hear what you're saying about the difference though...i like the sound of the 1920/7 - but i'm wary of running a motor with very few turns as i would like some reasonable degree of runtime, lol...
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For a given speed, the runtime between a low turn motor (high kv) geared low is VERY close to that of a higher turn motor (lower kv) geared up. The same amount of work is being done so power requirements are about the same.
If I were you, I would choose the motor kv to get around 35k rpm on 2s (4700kv) for the application you see yourself using the most. Then, gear it for the speed you want. For the times you want to "go crazy", you can still run 3s on that motor and still be well within the max rpm specs (52k).
So, if you plan to do more racing and have your 4700kv motor geared for 35mph (typical racing speed), hooking that same motor to 3s with the same gearing will get you right around 50mph give or take.