Thread: Perfect Drive?
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Unread 10-05-2011, 22:57
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Re: Perfect Drive?

Quote:
Originally Posted by MattC9 View Post
I'm running my numbers on 6in wheels. I am at 13fps
13 feet/sec vehicle speed, 8.6:1 gear ratio from CIM rpm to wheel rpm, 6" diameter wheels, 90% gear plus sprocket efficiency:

Code:
13		feet/sec vehicle speed
8.6		gear ratio from motor to wheel
6		inch diameter wheels
90%		power efficiency of gearbox and sprocket
		
18.85		vehicle inches per wheel rev
156.00		in/sec vehicle speed
8.28		wheel rev/sec
496.56		wheel rpm
4270.45		motor rpm
67.30		oz-in CIM motor torque @ 4270 motor rpm
520.90		oz-in wheel torque
173.63		oz wheel force
10.85		lbs wheel force
43.41		lbs for 4 wheels
43 pounds force just to keep the vehicle moving at 13 fps on a flat surface?

Does that sound right?