Questions recently about putting a motor on a bicycle reminded me of the phenomenon of home-brew bikes (and pretty much everything else) in communist Cuba. Since the imposing of the American trade blockade not long after the Castro revolution, Cubans have been forced to use, and re-use AND re-use vehicles. Photos of the streets show them full of late-fifties yank iron that has been refurbished 10 or more times to keep it running. Not surprisingly this same culture also applies to two wheeled devices; it even has a name. It's called riquimbili. You can read all aout it and see some amazing examples of the art here http://www.rikimbili.com/ Note the rocket-powered (?) device!!!