I used the 46FX out of my Nexstar for another plane a long time ago so I tossed an LA 46 (and a bunch of lead) in the front of it and let some friends try to fly it for practice (They fly C/L). It flew OK, like about 3/4 the power of the FX. We got to playing around with it and I flattened the wings, mixed in some rudder to elevator and put flaps on a 2-position switch. It actually flies better than ever and was fun to fly. In strong wind it gets to be a handful to turn and power is down for sure. I am thinking of putting a bigger engine in it to have more power and was thinking about an ST 51 or OS 55 or something along those lines. You guys have always given me the best advice so what would be a good value, plenty of power and reliable so I can use it in something else when I kill the Nexstar?