The videos aren't helpful. JG prints out a graph and tapes it to his monitor? The one comment says the plan is to use the Model T differential.
I wonder what's the Cd of a fender-less highboy Model T roadster. I looked for specifications of a random golf cart.
Quote:
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The electric vehicle runs on 48-volt power, motor and electrical systems. It uses four-12 volt batteries, a motor shaft direct drive train and a limited slip differential transaxle. The gas cart has a four-cycle, 24.5 cubic inch engine, a single cylinder valve train, and a starter and generator electrical system. It uses one 12-volt battery, a continuously variable automatic drive train and a helical geared differential transaxle. Although the electric version only achieves 4.4 horsepower compared to the gas version's 13.5 horsepower, both max out at ground speeds of 19.5 mph.
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https://www.reference.com/vehicles/s...9edad66640eb87
Golf cart have a 'ground speed'?
20mph is not much but putting it on 15" wheels would help the gearing.