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Newcommer. Questions on fast unicycles
[image: http://img208.imageshack.us/img208/6...itled1ev1.gif] Hi everybody. I'm a disegner of fast bikes (for speed records) and this is one of my recent ideas (modyfied centaur (it had two wheels before)). It has drive from hands and legs. Very beta drawing, just idea. I wold love to hear from unicycle experts : 1. would it be ridable? 2. are there hubs with integrated planetary gear for unicycles? 3. would it be possible to turn? I like this bike bacause it's simple and has good aerodynamics = high speed. -- mozg ------------------------------------------------------------------------ mozg's Profile: http://www.unicyclist.com/profile/13058 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
Nice idea! How does the hand pedalling work? T. -- DarkTom '*_My_Gallery_*' (http://tinyurl.com/9bnux) FORGIVE TOM, HE'S A NUTTER. OH, AND HE'S SCOTTISH, AND HAS A BEARD, ALL OF WHICH IS PRETTY FORGIVABLE TAKEN ALONE, BUT TOGETHER ADDLES THE BRAIN. - LOOSEMOOSE DON'T TAKE ANY NOTICE OF THE DARK ONE,HE'S A PLANK!!! - PEBBLES ------------------------------------------------------------------------ DarkTom's Profile: http://www.unicyclist.com/profile/6515 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
you'd need very strong arms... -- nickvb123 'Latency' (http://www.youtube.com/watch?v=V9ceW...search=latency) - Freestyle Unicycling ------------------------------------------------------------------------ nickvb123's Profile: http://www.unicyclist.com/profile/5926 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
This is centaur (combi drive) [image: http://img139.imageshack.us/img139/4336/kentavr7xf.jpg] centaur in action: [image: http://img47.imageshack.us/img47/1306/img47381bo.jpg] In unicycle case hands drive do the same, but connected diractly (via) chain to legs drive. -- mozg ------------------------------------------------------------------------ mozg's Profile: http://www.unicyclist.com/profile/13058 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
hmmmm. -- DarkTom '*_My_Gallery_*' (http://tinyurl.com/9bnux) FORGIVE TOM, HE'S A NUTTER. OH, AND HE'S SCOTTISH, AND HAS A BEARD, ALL OF WHICH IS PRETTY FORGIVABLE TAKEN ALONE, BUT TOGETHER ADDLES THE BRAIN. - LOOSEMOOSE DON'T TAKE ANY NOTICE OF THE DARK ONE,HE'S A PLANK!!! - PEBBLES ------------------------------------------------------------------------ DarkTom's Profile: http://www.unicyclist.com/profile/6515 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
oh now i get it. before i thought that you were pedalling with only your hands That would be very fun to ride if you could make it -- nickvb123 'Latency' (http://www.youtube.com/watch?v=V9ceW...search=latency) - Freestyle Unicycling ------------------------------------------------------------------------ nickvb123's Profile: http://www.unicyclist.com/profile/5926 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
i think it would be more efficient to just to use your legs only or your hands only. you will would have to have your legs spinning at the same rpm as your hands. -- stuckinwheeliemode ------------------------------------------------------------------------ stuckinwheeliemode's Profile: http://www.unicyclist.com/profile/11984 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
Hi everybody. I'm a disegner of fast bikes (for speed records) and this is one of my recent ideas (modyfied centaur (it had two wheels before)). It has drive from hands and legs. Very beta drawing, just idea. Sounds cool - very cool. I wold love to hear from unicycle experts : I'm nowhere near an expert, but I'm going to stick my oar in anyway :-) 1. would it be ridable? One thing I've learnt on these forums is that almost anything is ridable :-) No matter how crazy an invention, there's always going to be someone who can handle it. I bet many people would be able to ride it sitting upright and not using the hand cranks. Transferring to hand cranking too would be interesting - you'd have to be going slow enough that you could grab hold of the cranks. Riding this would require decent balance - you wouldn't be able to flail your arms around ;-) I don't know how much hand cranking would disrupt one's balance... What wheelsize were you thinking of? 36" wheels seem to be popular for speed / distance riding, although geared 29ers have some merits too. Oh, and a little safety point: it'd be really nice if you could fall off the front of this without getting your feet tangled in any machinery ;-) Although given you're unlikely to be able to run out of a speed record attempt maybe that's not so important! 2. are there hubs with integrated planetary gear for unicycles? Yes, see http://schlumpfdrive.com and search the forum history for Harper's Blueshift and uni.5. The Schlumpf hub is shiftable on the fly, Harper's hubs offer a choice of two ratios you can change with a toolkit (by adjusting the torque arm if I remember correctly - which I may not do). Also, look for PurplePhaze which achieves much higher ratios using a jackshaft system. Again adjustable using a toolkit, but a bit more work. It also featured a "tuck" handlebar arrangement, vaguely like your proposal (without the hand drive). OuttaPhaze is a proposed production variant of this design. 3. would it be possible to turn? If it could be ridden, then it could be turned. I like this bike bacause it's simple and has good aerodynamics = high speed. -- mark williamson Dave: Just a question. What use is a unicyle with no seat? And no pedals! Mark: To answer a question with a question: What use is a skateboard? Dave: Skateboards have wheels. Mark: My wheel has a wheel! ------------------------------------------------------------------------ mark williamson's Profile: http://www.unicyclist.com/profile/11301 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
The deisgn illustrated would have no advantages for speed at all. On a bicycle, if you can increase the power input, you can ride a higher gear at a given cadence, and therefore go faster. Power is not the issue on a unicycle. Turning a 20 - 36 inch wheel is not difficult and does not require a lot of torque at all. The problem is simply one of coordination. How fast can you spin the wheel whilst maintaining control? You can improve this by selecting an appropriate length of cranks (short cranks = potentially faster, but at the expense of some control) and by practising! As I understand your diagram, the hands and feet are each contributing driving force to the wheel, and are connected by a chain. I assume a 1:1 ratio between hands and feet. Anything other than that would be very difficult to co-ordinate, allthough I guess 2:1 would not be impossible. So you are increasing the torque available, but not the rpm. In fact, because of the additional co-ordination problem of having hands as well as feet pumping away, you are probably losing rpm. So you need to gear up the hub. Lots of people have experimented with geared hubs. It is possible to gear up the rotation of the wheel to about 1.6 or 1.7 (approx.) times the rotation of the cranks. Even that is the equivalent of a very low gear on a bicycle. At best you have a very pretty picture of something that would be more difficult to ride, and much harder to steer than a conventiojnal unicycle; which would if anything be slower on the flat, and a fair bit more dangerous. The only advantage I can see - and that a theoretical one only - is that it might be good for hillclimbing, on smooth straight steep hills. -- Mikefule "The world is Hell, and men are on the one hand the tormented souls, and on the other the devils in it." Arthur "Cheery" Schopenhauer ------------------------------------------------------------------------ Mikefule's Profile: http://www.unicyclist.com/profile/879 View this thread: http://www.unicyclist.com/thread/52286 |
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Newcommer. Questions on fast unicycles
Thanks for link and replys At least 1:3 gear needed. Ok. I see. This is cool but probably not for speed record. -- mozg ------------------------------------------------------------------------ mozg's Profile: http://www.unicyclist.com/profile/13058 View this thread: http://www.unicyclist.com/thread/52286 |
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