Try out the .46 FX or AX with YS blend 20-20 fuel and use the tower muffler with the 11.5 x 4 APC prop and you will start to get decent hovering performance as long as the density altitude doesn't get too high. I was out yesterday flying in 50 degree weather and it rocked. The $15 tower muffler is worth a serious boost, and with 20 percent nitro, it performs like a stock .61 on 5 percent.