Super Tigre .51 with a 10X6 MA prop on mine and it doesnt need to dive to loop. Will loop at half throttle during level flight, do rolls, slow or fast, snap roll, and fly inverted with minimal down elevator while carrying, in addition to the normal full sized flight gear, a 10 cell AA nicad pack, a 6 cell AA nicad pack, 900mhz video tx and CCD camera, an experimental telemetry unit measureing 2X3X5", a pair of small switches, all the wiring for the previous equipment, AND the grip of lead I had to add to the inside of the cowl to balance it.
Not bad for an ARF TRAINER.
Maybe I am just missing the point of overpowering this particular plane...