Electric is Watts per pound. For performance, figure 150 watts per pound of plane and you will be good. For a trainer 75-120 watts is sufficient.   Also most electric motors are labeled in their glow 2 stroke equivalent.  A Power 32 is roughly the same as a .32 2s, and Power 60 a .60 2S.  The Kv is revolutions per volt, so an 870Kv @ 11 volts spins at 9570 RPM's.  <div>
</div><div>I converted a Power 25 to glow so had to reverse engineer the power requirements to find the right motor. </div>