Unfortunately, to go at highway speeds for extended times requires good LIGHT batteries (which usually are expensive Li-Poly and require a battery management system) or to build large to fit larger batteries. Vogelbilt went large and built a cruiser that went highway speeds using 10 batts and Advanced DC Series wound 120V 78HP motor. For the electracruiser, it used a 5 speed and was able to reach higher rpms due to the amount of voltage. http://www.vogelbilt.com/spec.html http://www.austinev.org/evalbum/415 I am pretty sure that UJM's and Bandit's will not have that kind of room for your needs unless you seriously extend the frame which means you have to know what you are doing.
Most of the guys here are reporting ranges around 15-25 miles using non-lithium batteries. --- James Allgood wrote: I want to > build an electric commuter > bike based on a UJM frame, a Bandit 1200 or similar > large displacement naked > bike. My commute is over the Bay Bridge, so I need a > range of 40 miles with > 38 of those miles at 50-65 mph. > > I have everything pretty much worked out > theoretically, but I am having the > most trouble with the transmission. I don't think I > can get the efficiency > and range out of an electric motor without taller > gearing at highway speeds. > The big cruisers have a secondary drive but that > would take up a lot of > weight and size. Vectrix's planetary gear looks > promising, but where can I > source one? > > Maybe I am just spinning my wheels. Will a motor > spin fast enough to keep me > humming a freeway speeds with decent efficiency? > > Thanks for your help and if there is an archive > where I should look for > these answers let me know. > ____________________________________________________________________________________ Have a burning question? Go to www.Answers.yahoo.com and get answers from real people who know.
