Quote:
Originally Posted by MichaelBick
We chose 550s over the 775s because we didn't want to deal with the case shorting problem.
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IIRC, the 775 (when run at the same voltage as the 550) has more or less the same characteristics in terms of power, free speed, stall torque, etc. as a 550. However, since it is a larger motor, it performs much better thermally when stalled and when run over a long period of time. If you're worried about overheating, consider trying out 775s. I really like them as motors.
I can't really speak to the case short issue, as I've never seen a 775 case short, only a AM PG-71. However, I've heard through the grapevine (was this you, Adam?) that since 775s are a less common can size, China has more trouble manufacturing them correctly. Perhaps now they have a bit more experience, they're manufacturing them with fewer case shorts.