Being a noob around here, Any suggestions a where to put this new thread? seems to be some overlap & every one here is really pushing the limits as to what a bicycle is.... I have landed in the non hub section cause I can relate to the builds as a motocrosser & a lighter paltform of the bicycle seems a logical step in electrical transportation. Given the talent pool I am discovering reading back a year or so, I am a bit suprised that this hasn't been done alredy, I suspect it has & I haven't found it yet, that said I will answer some questions & attemp to steer this thread back on topic.
Miles, it would be no problem. An actuator would eliminate some of the parts I included (the detents for positioning the hub) given all the electronic prowess about, I speculate a load sensing auto shifting unit could be easily be designed & built.
etard,(love that name BTW) This is a plagerized version of a typicle constant mesh transmision lmited to 2 speeds. as far as noise from the chains, it will not be silent(which will be a goal on another build soon) I suspect the usual chain whine will be emited.As for more holes, I see no advantage over just an elongated hole LPF eluded to in his reply. (the female parts are 2mm over the dog dia. not clear in the photo's) any "more" or "bigger" is taking away from the integrity of the part. I used the C&S for costing considerations. They are way cheap compaired to an HTD belt system, easily modified & the #25 is the smallest I could buy surplus, as size was a major consideration on this build.
I am glad to see some interest in the transmision.....but I almost threw the idea of fabbing this thing out the window after watching & hearing Garry jamming gears on his direct drive S-A 3 speed (my e-bay unit just arived this week
) seems like a hub could be fabricated to accept the 3 speed mechanism & offer disc brakes & a dual freewheel. Easyer for some I suppose but well within the skill set lurking about.
My thoughts on a final design:
Use real gears (they would be way more compact,& gearbox design is very flexable)
As a K.I.S.S. devote' I would opt for a manual shift.(gives the operator a more conected feeling....specultive)
No such thing as a "universal" bike (was there ever?) so mounting is allways the bigest hurdle. I would think a bolt on design would require a thourough discovery of the bottom bracket. as this seems to be the most universal part between bikes these days. This should get some conversation going.
Apoligies for the mini novel, I await the replies.