I just finished converting over to brushless.My setup is:
Mamba with fan
Novak HV 4.5
True rc 4s 8000mah
I made the conversion myself [battery tray,esc mount,motor mount]
On a 45 degree day after 15 min of running motor temps were 80 degrees and the esc was at 145, this is before I put the fan on.
Yep, my LHS ordered it from great planes, so Tower hobbies should have it available. It went together nicely, and the shaft has a flat area grond on it all the way to the bearing. Nicely made just like all of novak's motors.
The rotor is small in diameter, but long so I think it will make a nice 3s motor fot the crt.5. Not sure if it will be better than the plett, but the 1/8" shaft on the plett was bothering me, as there is no slipper on the crt.5. I may put the plett in an emaxx on 4s, and see how it does!