Drive
So I need 2000 to 2200 rpm from my propeller My battery is 44. Volts The motor is rated at 180kv which means it will do 180rpm per volt 180 X 44.4 = 7992rpm I will also assume that the motor will not reach this rpm under load so I will say the motor will do 6500rpm at nominal voltage under load. (All assumptions but this is all I know) Mechanical drive ratio needed to deliver prop speed: 7000 / 2200 = 3.5 So my Reduction ratio will be 3.5 : 1
I have thought about ways to deliver this ratio like, gears, belt and pulleys but have decided to use chain and sprocket drive. I will use 8mm standard chain and sprockets used on midimotos, pitbikes and small quads. These are readily available in all different sizes and cheap. I have found sprockets on ebay 54 tooth and 17 tooth to give me the ratio. This should give me some thing near.

