Second, the product of

is all there is to work with in design. You give the vehicle a smaller frontal area and/or you make it more aerodynamic

The second is rolling resistance.

where

is in Watts

V is velocity in meters per second

is the coefficient of rolling resistance which is a property of the tires used

g is gravitational constant, 9.81 m/s^2

m is the mass of the vehicle in kilograms

Here there are two variables that one can tweak, the coefficient of rolling resistance of the tires and the mass of the vehicle.

So that's the major variables in designing for low power requirement at reasonable speeds; aerodynamic shape of vehicle, frontal area of vehicle, mass of vehicle and tires used.

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