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Power and Speed
Power, Given Speed calculates power at some given speed. Speed, Given Power calculates speed at some given power. If a rider has less weight going up a hill, how much faster will the rider be? Air density can make as much as a 10% difference in speed. These calculations are made assuming forces are in equilibrium and a rider has reached steady-state conditions.

Measure rotational inertia. It's easy. Which wheel would be best for a climb? Which for a sprint?

Forces not in Equilibrium
More often than not, forces on a rider are not in equilibrium. This happens at the start of a time trial or short track event such as a 500 m TT or a Kilo. Under these conditions speeds change as time progresses. Plots of speed, distance, and acceleration show how these parameters change with time.

Power Profiles
In sprints a rider's power output peaks rapidly and drops off. This is commonly measured with a Wingate Test. One can create a equivalent sprint Power Profile and use it in subsequent calculations.

Pedaling Model
A model of pedaling a bike is presented. In concept, the Model Small Pedal Model Iconlets one make assumptions regarding strength of the thigh and shin muscle groups and converts these assumptions into power at the pedals. The Model can be used to investigate optimal seat height, optimal crank length, effect of "keeping the heel down," or improving muscle strength. Plots of forces at the pedals and of strength of muscle groups are presented.

©1998 Tom Compton