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Old 2008-02-09, 07:33 PM   #61
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Quote:
Originally Posted by UNIdentified
has anyone thought about using hydraulics? it wouldnt work quite like suspension. but you could just drop the frame so it's right on your tire when you park it. actually you probably use something like the set up in an office chair. you just wouldnt be able to raise it while you were rollin. I know a guy in edmonton here who builds billet wheels and he figures he could build something to work with a uni hub. then just do a lil gold flake chameleon paint job on there. big pimpin ladies. big pimpin
Your talking about a tire with hydraulic pistons in it? well, if you are, tjpse sytems dont work unless your able to mount a piston in one area, and not have it move, which would sorta defeat and abilites, if your talking in the frame, its not actuall suspension
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Old 2008-02-09, 07:45 PM   #62
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I'm talkin about having the "pistons" in the frame. So that it would raise the frame to a comfortable length for cruising but u could lower it just for fun. Obviously I'm not talking about using it for its suspension qualities. Id love to just roll up to the store on my uni and lower the hell out of it, then you ride it real nice and slow. That would be badass. As for the rim. I was just sayin that cause if you could get a one off billet wheel for your flaked out slammmed down street uni. Well that would be a beautiful thing to me.

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Old 2008-02-09, 07:48 PM   #63
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sounds cool. Draw up some plans man lol. instead of the frame, why dont you jsut do seatpost? because the frame would end up sitting on the tire lol. A seatpost with a deskchair hydraulic in it would be pretty cool
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Old 2008-02-09, 08:03 PM   #64
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the seat post would be easier. this is true. but im thinkin of it more from a "car guy" sorta view. and the idea with that is to have the frame sitting on the tire for show when its parked. with as little clearance between the frame and the tiree as possible. but its just a loosely concieved idea. a vision.
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Old 2008-02-09, 08:05 PM   #65
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its still a great idea though. Im looking forward to see a hydraulic unicycle lol..
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Old 2008-02-09, 08:24 PM   #66
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Hopefully this pic will load. I tried to come up with a simple way to do it. maybe use an elastomer instead of springs. This is just an idea, not a worked out design.
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Old 2008-02-09, 08:27 PM   #67
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My bad..
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Old 2008-02-09, 08:29 PM   #68
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that actually seems really cool pete. very awesome at first glance its a little big, if it can be slimmed down the the width of a crank... and not pull out of its socket, it'd be pretty awesome
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Old 2008-02-10, 01:03 AM   #69
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Thank you. I'm thinking that to make it stable and give the split part of the crank more support it could have plates on either side which would also give the part that the pedal is attached to lateral stability. The pedal lever pivot could be attached to the plates making the internal portion of the split crank really simple. Maybe the springs could be clutch springs or dual rate springs. the nice thing is that the main unit would be slim and would be out of the way even though it would look big and dorky.
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Old 2008-02-10, 07:32 AM   #70
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This looks kind of extreme. You can get about 3 inches of compression from a MUni tire when it bottoms. This spring has less travel than that. A trials tire will give you about 2 inches and this is slightly more. Your feet would move closer together, too, which might feel weird. I would like to find out what the elastic limit is for a spring steel like 1095 and what the likely deformation is. Maybe a coil spring around the axle is necessary. That makes things complicated and ugly.
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Old 2008-02-10, 03:01 PM   #71
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I actually like that a lot. If it actually has the same elasticity as your sketch, it'd end up hurting your ankles i think. If you landed off of a big drop you'd end up loosing your footing and twisting, if not breaking an ankle. i still think its a really cool idea. If it was too elastic-like it could cause bad damage lol..
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Old 2008-02-10, 09:53 PM   #72
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Quote:
Originally Posted by harper
This looks kind of extreme. You can get about 3 inches of compression from a MUni tire when it bottoms. This spring has less travel than that. A trials tire will give you about 2 inches and this is slightly more. Your feet would move closer together, too, which might feel weird. I would like to find out what the elastic limit is for a spring steel like 1095 and what the likely deformation is. Maybe a coil spring around the axle is necessary. That makes things complicated and ugly.
60 degrees of torque would be a rather fat person or a very serious drop with a metal that is strong enough to be able to actually ride on when not hopping. Is that autocad that you drew those up on?
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Old 2008-02-10, 11:48 PM   #73
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Perhaps I am missing something, but would "sprung" or spring-equipped cranks not foster horrendously inefficient use of pedalling energy?
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Old 2008-02-11, 12:18 AM   #74
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Quote:
Originally Posted by sutton629
60 degrees of torque would be a rather fat person or a very serious drop with a metal that is strong enough to be able to actually ride on when not hopping. Is that autocad that you drew those up on?
That is in AutoCAD.

A four foot drop with 2 inches of compression for a 160 pound rider constitutes an impulse force of about 2000 pounds. This estimate assumes AISI 1095 steel, 0.5cm thick, 2cm wide, 7.5cm long from clamp to clamp, and with linear restoring force over the entire 60 degrees. The same 160 pound rider when standing with all of his weight on one pedal can of course only exert 160 pounds. That would deflect the pedal about 0.16 inches. Pedaling may or may not see this full weight of the rider on each half stroke. The entire problem is non-linear because that compression also causes the pedal to rotate about the wheel axle. At 60 degrees the spring steel would probably be permanently deformed. In the limit, 90 degrees of rotation, the pedal is stopped at the bottom and compression ceases entirely. I think it might be more interesting to see if pedals like these could be used as a springboard to increase hopping height.
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Old 2008-02-11, 12:18 AM   #75
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Quote:
Originally Posted by unisteve
Perhaps I am missing something, but would "sprung" or spring-equipped cranks not foster horrendously inefficient use of pedalling energy?
Yeah, I'd imagine riding up or down a steep slope would feel pretty horrible.
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