The Geysers Panorama - 3/2010

The Geysers Panorama - 3/2010
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Power vs. Speed Studies

These tests recorded speed and required power at the rear wheel for each test run. The data at the following links were generated by successive test runs at different speeds on a nearly flat, straight, windless road. Combined with measured data such as frontal area, temperature, bike+rider mass, an approximation for coefficient of drag can be calculated. To get the best estimate for Cd I adjusted coefficient of rolling resistance for the minimum standard deviation of CdA.

Motor Efficiency Curves

All of these charts show Efficiency vs. Power In. Power Out was measured directly at the rear wheel using a PowerTap power-measuring hub.

These links are my short list of web sites for more information on electric bikes.



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