Steve,

i tried it with both my Great Planes 35amp ESC and my Phoenix 45ampESC................i tried different props and even went to the trouble to mount it in the Bipe to compare.
i sent it back today.
there is just something that is a bit off about it.

one thing i was impressed with in regards to these Rimfires though was that with the same prop, and fully charged battery, they both produce the exact same high rpm figures.
the one i sent back just had this wierd harmonic resonance at a certain RPM.

i also went ahead and placed an order for a 3rd motor, so when i get the replacement i will have 3 to compare with. if this resonance is in any of the 2 upcoming motors then i will know for sure it's just a normal thing. kinda expensive way to find out, but i can always use a spare right?