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