Motors Motor choosing?

[PeachFuzz]

Help!
So what is the numbers on the motor like 2115-900kv?
Dynam Motor ESC Combo BM2815A-KV1100+30A ESC for RC Planes will that work with the rc-help trainer
And what size prop should I get with this?

 

[RandyDSok]

There is actually no standard on the numbers but they typically mean either the outside diameter and length of the motor can... or the size of the stator on the inside.

The KV number is the number of revolutions x 1000 at one volt that the motor spins. This is also not exact but pretty close... sometimes they are rounded a bit.