Originally Posted by

**khuon**
Hmm... let's do a little rough math here.

Bicycling magazine once published some figures for calorie burn rate. Let's assume rider weight of 170 lbs. and an average speed of 15MPH. The figure I have is 0.0561 Cal/lb-min. for flat terrain. So given that...

0.0561 Cal/lb-min x 170 lbs x 525,600 min/year * 5 years = 2,5063,236 Cals

Converted to joules that's 104,934,756,484.8 joules. Just to give you an idea of how much energy that is, a gallon of gasoline has about 1.3x10^8 joules worth of energy. Thus we're talking about 800 gals worth of gas here. In order to achieve this type of energy density, in a compact enough form to be placed on a bicycle, you need to start looking at miniature nuclear batteries. Have you been talking to Fleischmann and Ponds?