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Re: Tetrix DC Drive Motor W739083 dynamometer data
Thanks for the data Richard!
4"x1:1 versus 3"x1:2
(4"x1:1 is a 4" wheel with a 1:1 ratio, direct driven; 3"x1:2 is a 3" wheel with a 80T gear on the motor and a 40T gear on the wheel)
Since mass will affect every race, is the added mass to get a 1:2 gearing on a 3" wheel worth the complexity versus a direct drive 4" wheel? I don't think so. My charts show that a 3"x1:2 is only 0.1 seconds faster than a 4"x1:1 since adding gears adds weight (gear mounting, extra axle primarily). I'd suggest trying it with both and seeing what you gain from the flexibility in the design from 4"x1:1.
Edit -- Whoops -- the calculator didn't factor in another efficiency drop due to the extra gears -- so now 3"x2:1 is just on par with 4"x1:1.
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Last edited by JesseK : 14-01-2011 at 10:16.
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