What are you determining speed with? 30mph at 4600rpm with a 20 pitch prop
seems slow. (lots of slippage. If you know your final drive ratio you can
calculate your max speed at any rpm with your prop. Just remember a 20 pitch
prop moves forward 20" in every revolution. With a 1.6 ratio (I don't know
yours this is just an example) final drive your max speed would be about 55
at 4600rpm. Even at an inefficient 80 per cent you still should be doing
over 40.


GPS -- so I'm pretty sure it's accurate -- I don't know what my final ratio is.




---
Remove x's to send.