RE: KV Rating on Motors
Another concept which helps to understand the whole KV thing is to know that if you apply a certain (same) voltage to a motor it will spin the same rpm regardless of what prop you have on it (or no prop at all!). Keep in mind this does require that the amps can be delivered to the motor as the prop size increases. As prop increases your amp draw will go up but if you stay at same voltage rpm remains constant.