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**Denver Dude**I think it's a given that it takes twice the horsepower to double the track speed (not counting rolling resistance, acceleration, curves, etc.). Also, to maintain the same speed when encountering a grade increase I understand that horsepower must be doubled for each one percent increase.

Does anyone know if that would also be true of a car, truck, bike, etc. I know the friction coefficients are different, but it would seem that the principles are the same.

Any thoughts? Thanks.

Does anyone know if that would also be true of a car, truck, bike, etc. I know the friction coefficients are different, but it would seem that the principles are the same.

Any thoughts? Thanks.