Should be plenty for 4 or 5 of them, unless you are using them in a bigger 3D heli or something. The Castle BEC just came out and it's pretty stout. I have one in my 3Dhobbyshop Aspera (4 HS-65's) and plan to use another one in my Hyperion Katana F3A and 24% Extra 300. The Extra will use 5 digital high torque standard's...