[mathking]

We tested the CIM coolers last year and found that while they had a small (but consistent and statistically significant) effect in keeping the motor from heating up too much (on the order of 5%), they aided quite a bit in cool down time. Particularly if a fan was included. I wish our design had been better and we had included them on the final drive train. I have a friend who design motors for a living who explained that while most of the heat is dissipated through the shaft for a motor like this, the case obviously heats up so it is dissipating non-trivial amounts heat through the case. And that if you are operating the motor in a way that causes it to heat up excessively, you should try to redesign. But if that isn't possible even small amounts of increases heat dissipation can have a positive impact on motor performance and longevity.