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| tom osselton:
Could you make a expandable pulley to vary the ratio? that way you would not need a transmision. |
| S. Heslop:
--- Quote from: tom osselton on June 01, 2014, 09:06:34 PM ---Could you make a expandable pulley to vary the ratio? that way you would not need a transmision. --- End quote --- They're too expensive but it's just made me wonder why I don't just replace the sprocket on the rear wheel with a huge pulley so I won't have to bother with gears. |
| vtsteam:
Belts waste a lot of power, and there isn't a lot to spare. Chain and sprocket would be better. |
| vtsteam:
But if clutching is a necessity, I also think that the friction drive against tire or hub has got to be the simplest of all, with a really good reduction ratio -- probably a 2" dia drive would get you in the ballpark, but easily changed-- maybe from a boat rubber trailer roller. And this has been done on bicycles a lot -- I think I remember them in France. Aftermarket adaptations of standard bicycles I believe. |
| S. Heslop:
I also remembered why I gave up on pulleys earlier. I don't have the space between the wheel and frame! Or anywhere good to mount the motor. Found this from googling a bit. I didn't think about using a motor on each side but that seems expensive. Although maybe not much more than spending a fortune on metal... Can't find any videos of the thing actually pulling a person though. |
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