Eracer_21, your OS 32 should have enough power to climb easily. I think it's not the kind of engine you use that's limiting the power. I think you should check some things before you change : didn't you set it too rich?, if you use a fuel filter, is it clean ? Is your power curve set right ?, is your fuel supply OK?, if you assembled it yourself, are the main and tail rotor running smootly?. I use an OS 32 in my Sceadu and even with heavy 570 mm FRP blades, it has enough power to climb reasonably fast. I use 13 % nitro but it will go with 10 % too.You can loose a lot of power when there is some friction in the main and tail rotor !