Popular applications for A40 motors:

Electric motors are rated by watts. 100 watts per pound is common for sport flying, 150 watts per pound is preferred for aggressive aerobatics. Propeller and battery sizes are listed in the EXAMPLES tab of the individual motors.

A40-10S V2 14 pole — 900 watts. Equivalent to glow .46. More aggressive than E-Flite 46.

A40-12L 14 pole — 1,000 + watts on 6S.  Equivalent to glow .60.