Understanding ESC PWM and Timing settings

[hillsmaverick]

I hope someone can demystify the motor ratings for me. As I understand it the kv rating in thousand rpm/volt. In other words the same motor would have 2x rpm on a 6 s than a 3s. But I see no power ratings ie HP watts or amps. how do I know what motor to get.

[npomeroy]

Originally Posted by hillsmaverick

I hope someone can demystify the motor ratings for me. As I understand it the kv rating in thousand rpm/volt. In other words the same motor would have 2x rpm on a 6 s than a 3s. But I see no power ratings ie HP watts or amps. how do I know what motor to get.

Motor kv is motor revs per volt, so 6S (23v) on a 1150 kv motor gives 23 x 1150 = 26,450 rpm at 100% power. Take your pinion teeth divided by main gear teeth (e.g. 16/170 (typical for TREx550) = 0.094) to give the reduction in rpm between motor and head speed (26,450 x 0.094 = about 2500 rpm HS).

So find out from the kit instructions or from forums what is a suitable rpm for your model. The other thing is the power rating. See http://media.hyperion.hk/dn/hs/hs-spec.pdf especially page 2 for guidance on motor selection according to model.
Note that Watts = amps x volts.

Note that for scale models the HS can be much less than 3D versions and motor and gearing are often modified accordingly.