40 Sized Outrunner
This motor was a great buy and has gobs of power but it gets a "3" for two reasons. One was that the collet type prop mount supplied was unusable. The blade tip tracking on a 12 inch prop was off by over 1/2 inch. I replaced the prop mount and the problem was solved. The second concern I noted was a strange metal to metal like howl at a certain low RPM. Once that particular RPM was passed the motor sounded normal.
I give this product 3 stars. Review by VanCleave, Guy