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Re: Designing a Planetary Gearbox to increase speed?
Engine efficiency is not (necessarily/generally) a function of incomplete fuel combustion. Engines do not provide 100% of the energy produced by burning fuel as useful mechanical energy. The balance of the energy is released as heat.
A modern gasoline engine has an efficiency typically in the range of 25-30%.
Engines operate most efficiently within a certain rpm range. This provides the connection between gear ratios and engine efficiency.
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