Hey all. I'm going to do what i think is an upgrade in my align 600 esp heli. Starting with the motor..This align 600xl motor runs very very hot ( its geting old with many flights) . And since its going into a scale bird soon. I'm looking at the align 600mx 1220 kv rated motor....Here comes my question :: from what i gather this 600xl motor is rated at 1700kv. no wher is this written on my motor. I'm just assuming from googling the motor that this was the only kv value given for this motor. ..I only get about 4.30 min flight time with this motor...With the same set up I'm running now only with the upgraded align 600mx 1220 kv motor will my flight time be increased ?? ....I realize this can be a very boring post..Will take someone special to answer I'm sure..Heres hopeing.

If you continue to use the same gear ratio and blades on the 1220Kv motor as you did on the 1700Kv motor... yes, your amp draw will drop dramatically and your flight-time will increase... but you'll have to hope your heli will still fly at lower rpm and lower power! To get the same blade rpm and power from the 1220Kv motor you'd need to raise the gear ratio by ~40% (pinion with 40% more teeth)... then you'd have same power = same amp draw at same voltage... so same flight time as before!

Thanks for the answer Dr. K...