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Shifting on the fly PING Harper
Leo- I have discussed this before way back when. I have made small diameter slip clutches (3"-4") and found that it takes a lot of axial force to keep them from slipping. It also has to engage on two sides so the transfer mechanism must be bidirectional. The tab never rotates freely, it is either connected to the hub with a bolt or to the frame with a bolt. Devices like this are generally real-estate hungry. In theory it's a good idea except for the "gradual" part. There is no gear ratio transition, you're in one or the other so rapid disconnect-reconnect would be essential. -- harper - Old dog, no tricks -Greg Harper B L U E S H I F T "Are you OK???" - Just about anyone I've ever ridden with ------------------------------------------------------------------------ harper's Profile: http://www.unicyclist.com/profile/426 View this thread: http://www.unicyclist.com/thread/27316 |
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#2
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Shifting on the fly PING Harper
Has anyone ever felt what it's like to change gears on a unicycle? -- gerblefranklin ------------------------------------------------------------------------ gerblefranklin's Profile: http://www.unicyclist.com/profile/4295 View this thread: http://www.unicyclist.com/thread/27316 |
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Shifting on the fly PING Harper
First, let me freely admit that I know nothing about this unicycle except what I have seen and read from these postings. However this is the web, so I won't let that deter me.... I am *guessing* that when the tab is disconnected entirely and you pedal, the hub whirls around in the opposite direction and the unicycle doesn't go anywhere. So this is actually a three speed uni: fast, slow, neutral! Harper let me know if I am way off on this. I have been mulling over this shift on the fly problem, with gears and chains you always have one of two problems: 1. freewheeling, unable to provide torque while the chain is moving (typical bike scenario) 2. locked, both sets of gears are momentarily connected and the shaft won't turn. It seems like of these, number 2 would be more tolerable: that you would stop at the top of a hill, shift, then head back down. A very interesting problem. Phil (reverse engineer) -- schroder - Occaisional Unicycler ------------------------------------------------------------------------ schroder's Profile: http://www.unicyclist.com/profile/4234 View this thread: http://www.unicyclist.com/thread/27316 |
#4
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Shifting on the fly PING Harper
gerblefranklin wrote: *Has anyone ever felt what it's like to change gears on a unicycle? * Yes. As Mikefule pointed out, it is similar to shifting while riding a b*ke on one wheel. However, the balance point is way different, and a shifting error would never be a minor incident. A missed gear will cause an instant face plant. I haven’t experienced this yet, but it would be no different than a seized wheel, which I have experienced. You find yourself bouncing along the ground wondering what happened. Additionally, a large gearing change such as that on Blue Shift would be very difficult to compensate for on the fly. My gears are spaced very closely, and shifting is still a very delicate procedure due to the change in the balance envelope and the knowledge that my teeth are only a millisecond away from the pavement. -- unibiker - What is that thing anyway? Jeff Baker ______________________________ Favorite comment (from a child) 'You can't do that. That's impossible.' 'Unibike Pics Here' (http://www.unicyclist.com/gallery/albun01) ------------------------------------------------------------------------ unibiker's Profile: http://www.unicyclist.com/profile/473 View this thread: http://www.unicyclist.com/thread/27316 |
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