That sounds about right I think between 5-5.5 lbs is what it calls for. Here's my motor

http://www.headsuphobby.com/Emax-BL4...otor-B-120.htm

See with the 15x8 on a 5s it gives you way more thrust but brings the watts down from 1150 to 870. I don't understand watts. Is it ok to use the bigger prop for more thrust? Or should I go 6s 13x6.5 for more watts? Looks like the previous poster had about the same setup as me