hiya, i need some help for a project im working on, basicly i have a compressor pump that runs at 500rpm and @ 12 hp. now the problem is (this is a theoretical problem) i have to power it using a 3480rpm ac motor which has to be less than 10 hp (cost reasons). rough calculations show that a 20cm pulley on the compressor pump and a 3cm pulley on the motor will give me the correct speed reduction, but what do i do about power?. will the speed reduction increase torque giving me the power i need? if this is the case what is the minium sized motor i could use? what if i used gears, id be looking at a ratio of 1:0.15? hope thats clear, any websites or calculations that can help me with this would be amazing as im really baffled. thanks alot.