1: Electric bikes!
A really good overview of the various ways to power an electric bike. The author describes DC series motors (cheap, available, heavy) and the 3 phase AC motors (light, efficient, costly) as well as battery requirements. Obviously we would all like a bicycle that is light, efficient, and can be powered by muscle or electricity as required with no weight penalty: not gonna happen. Electric bikes are for efficient transportation to work, school, shopping. They will always be heavier and glonkier than traditional human powered bikes. but they may fill a niche for those of us who really depend on our bikes to get around.
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