Size motors to use with MMP

[ta_man]

Originally Posted by asheck

If it is the standard size rotor, it is actually supposed to raise the kv slightly, if it is the 14mm rotor it is supposed to drop the kv substantially . This is assuming that the 4400 is going to respond the same as a 4.5. Which with 1/8 shaft was listed as 4800 kv. Then with the 5mm upgrade they changed it to 5000kv. Now they say with the 14mm rotor you can gear it up because of the lower kv and added torque.

That 4400 rotor was supposed to be horrible, your lucky it didn't blow. Mine was atleast the sintered 1/8th shaft.

If it was the 14mm rotor I wouldn't be scared to throw 5s at it. Novak did this to a stock 4.5 and broke 100mph in a street car, with their esc.

The 4.5 on 5S was run for what, one attempt (130 feet?) at a speed run?

The HV4400 is a 6.5 turn motor. From the original bonded rotor to the 12.3 (or so) sintered rotor takes the KV down to 3400. The 14MM rotor is supposed to drop the KV another 20%, taking the 6.5[HV4400] to 2720. That still seems high for 5S. I'd say go with a 7.5HV.

I've been running a 7.5HV on 3S in a CRT.5 (using a Havoc 3s) and it runs plenty fast.