Choosing your motor & Understanding KV

 Kv is interpreted as how many times a motor spins per volt it recieves so a 1000kv motor with a 12v battery will spin at 12000 rpm with no load on it. However that only tells you about rpm it doesn't tell you how much force is behind that rpm for that you need to consider how many watts the motor puts out, you can usually find this in the motors specs.  
There are many factors in choosing a motor but using the information below should give you a good starting point

Watch the video about Kv ratings then use the information below to help you choose a motor thats right for you

Heres a rough guide to what props to use with what kv motors, if you need to know more about prop sizes click here  

2200kv with a 6 x 4 prop = (makes a lot of noise but creates a lot of speed more for sport flying and general hooning around, put it on your bixler and it will fly vertical!) 

1500kv with a 8 x 4 prop = (quieter motor with a more scale looking prop size has a balance between torque and power better for more civilised scale appearance  flying)

1000kv with a 10 x 4 prop = ( much more torque, ideal for multirotors or 3D flying) 

Now you have an idea of what kv rating is right for you, have a look at your chosen motor specs to see what the output is in watts. Then weigh the plane you're going to put it in and use the guidelines below

Less than 22 watts / kg - very lightweight / low wing loading slow flyer.

22 to 36 watts / kg - powered gliders, basic park flyers and trainers.

36 to 54 watts / kg - sport flying and basic/intermediate aerobatics, scale flying

54 to 81 watts / kg - more serious aerobatics, 3D and scale EDF jets

81 to 90+ watts / kg - faster jets and anything that requires a lot of power