RC BASICS: What is KV?

When using electric motors to power RC model aircraft you’ll often hear the term KV - so what is it? In this video, I explain what KV is and how it can be used to calculate the RPMs of a motor when powered from a battery of a known voltage. I also demonstrate how to measure the KV of a motor when it is unknown -- although you can buy a KV meter which will do the job much more simply if you want. I’m sorry that this video is a bit long -- I may re-edit it later and shorten it up a bit.