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Re: Another geared unicycle...

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rec.sport.unicycling
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20 May 2005
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25 May 2005
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harper
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  1. Cool design and beautiful package, George. So, 22mph and counting; how
    many miles and counting? Does the frame flex with the split axle or does
    the wheel axle keep it rigid?

    --
    harper - TANKED at GASWORKS

    -Greg Harper

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  2. Cool!
    What's the effective wheel diameter?
    How does it ride compared to a standard uni where the cranks are at the
    center of the wheel?

    --
    john_childs - Guinness Mojo

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  3. Man George, that's excellent!

    I must have watched the video clip 10 times.
    Even the cow, in the background, looks stunned...

    --
    roadkill - Crash Test Dummy

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  4. harper - Thanks. Maybe 30 miles... I've been waiting for nicer weather.
    No detectable flex... anywhere. No backlash either.

    JC - 2:1 on a 26" Hookworm, so around 54". It's a coker and a half!
    Unlike planetary hubs, I can change gear ratios pretty easily. For now
    this is plenty fast!

    re: offset cranks - It's a bit goofy on the first go. After 3 practice
    runs it's just like normal.

    roadkill - I think the cow was just cold 🙂 It was about 20F for the
    test ride.

    --
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  5. edit: deleted!

    --
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  6. I have seen this idea a few years ago. The build it on a 28 inch. I
    don't know where. I just find it by searching on google.

    It is a cool idea.

    But i think that you can't jump. Because your axe is not 1 piece. So you
    will probably breake your axes.

    Maybe I'am going to build that on my 28 inch.

    Than you will go quite fast.

    --
    eenwieler - level 5 unicyclist

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  7. That's fantastic! So simple and solid looking.

    Andrew

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  8. Please manufacture one, George!

  9. Wow, really cool George!

    You look so comfortable on it and in control.

    --
    U-Turn - As long as my feet keep movin'...

    Weep in the dojo... laugh on the battlefield.
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  10. Out of curiousity, have you thought about making it a low rider
    (mounting the cranks below the hub)? Realistically, you won't be doing
    much offroading, wouldn't lower your center help some? How would
    changing the pivot at the center of the wheel effect the ride?

    --
    Dirtsurfer - One wheeled

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  11. George,

    It's about time you showed this to the rest of the world.

    The video rocks!

    Mojoe

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  12. Nice looking ride, George.

    Dirtsurfer said:

    *have you thought about making it a low rider (mounting the cranks
    below the hub)? Realistically, you won't be doing much offroading,
    wouldn't lower your center help some? *


    I was thinking the same when I watched the video. That wheel is probably
    too small for flipping the drivetrain, but it might work nice with a
    bigger wheel, maybe even a 29".

    Of course the "budget" way to make one of these is to put the crank axle
    just above the tire, so you can use normal giraffe parts. Tom Miller
    used to make geared-up 20" unis like that, which he called Travelers.
    Like George's, you can change out the sprockets for different gearing
    (in the shop, not on the road).

    With a Traveler design, you could also do what Walter Nilsson did on his
    cross-country ride in 1933. His giraffe had a different-sized bottom
    sprocket on each size, so he could change effective gearing by taking
    off the wheel and turning it around.

    Quoted message said:

    *How would changing the pivot at the center of the wheel effect the
    ride? *


    It's a giraffe. As you bring the pedals closer to the wheel axle it
    acts less giraffe-like, but that should be about it. Then with a
    geared-up wheel, you should get a little bit stronger gyroscopic effect,
    though this is offset by the unicycles' natural tendency to wobble.

    I've never tried a unicycle with the pedals below the wheel axle. That
    would be different.

    --
    johnfoss - The wilder Wilder

    John Foss, the Uni-Cyclone
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  13. Nice design.

    All these geared unis... Must ask....
    At what speed does a person have to tuck and roll out of a uni crash?
    How fast can a person run AND how fast can a person's feet go from
    pedaling to running at full sprint?

    What new safety innovations will have to be developed for personal
    protective gear? How about a personal air bag? Fly off the seat and
    you turn into the Michelin Man and bounce to a safe stop. There is a
    test that would make a great video!

    I'm not sure my body is ready to recover from a crash at 20+ mph. Are
    these geared unis going to be just for those who are willing to risk a
    high speed crash and related injuries?

    I guess having a geared uni would be a benefit to people as myself, who
    don't want to risk a "high speed" crash, in that a common wheel size
    would allow more tire options. I love my coker, but tire options are
    quite limited.

    Geared unis are trick and cool, but will they ever replace the big
    wheel?

    Good work, George. My comments aren't meant to be negative. Just
    thinking out future needs and concerns. Hope it gets to production and
    you can make a few bucks making it.

    Bill

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  14. billham said:

    *

    All these geared unis... Must ask....
    At what speed does a person have to tuck and roll out of a uni crash?
    How fast can a person run AND how fast can a person's feet go from
    pedaling to running at full sprint?

    *

    I have tucked and rolled from a 20mph dismount with knee pads and a
    helmet. I was lucky and went down foot, knee, hip, shoulder, hydration
    pack, helmet, backward somersault. This ended up injury free.

    --
    harper - TANKED at GASWORKS

    -Greg Harper

    B L U E S H I F T

    "My world view has come crashing down like a drunk clown on a giraffe,
    riding through a cactus patch..." -evil-nick on "Entry of the
    Gladiators"
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  15. billham said:

    *All these geared unis... Must ask....
    At what speed does a person have to tuck and roll out of a uni crash?
    How fast can a person run AND how fast can a person's feet go from
    pedaling to running at full sprint?
    *

    14 to 15 mph is the max that I can expect to be able to likely run out a
    UPD and stay on my feet. I've run out a UPD at about that speed and
    stayed on my feet.

    I experienced a Coker UPD at about 17.5 mph and ended up sliding on the
    ground in a superman position. I had inline skating kneepads and full
    finger leather cycling gloves on. I was sliding on the gloves and
    kneepads. No injury to me other than a minor scrape on my forearm from
    the pavement. I don't have very good instincts to go for a tuck and
    roll. That's why I ended up in the superman position sliding on the
    ground. The protective gear did its job.

    At 17.5 mph I was able to get one foot on the ground and then the second
    foot on the ground in an attempt to run it out. But I can't move my
    legs that fast and the attempt at a run out was futile. One foot, two
    foot, superman dive (or a tuck and roll if you have the instinct).

    One potential problem with the geared unicycles on smaller wheels is
    that your feet are closer to the ground than with a Coker. With your
    feet closer to the ground you're not going to have as much time to get
    your feet into a running position during the first part of the UPD. It
    will probably be more difficult to run out a UPD on a smaller wheel
    where your feet are closer to the ground. George's geared uni looks
    like the pedals are actually a little bit higher than a Coker.

    --
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  16. Dirtsurfer said:

    *Out of curiousity, have you thought about making it a low rider
    (mounting the cranks below the hub)? *

    If I look at the frame photo I see four problems with that idea.

    1.) It appears that the crank axis to axle axis distance is about 6" or
    a crank length. For a moderate sized wheel the design would exclude
    people who don't have that extra 6" of inseam. George has it and
    wouldn't care, though.

    2.) The crank axis would be close to the ground and with a small enough
    wheel some serious pavement strikes could be made on the pavement with
    the pedals during a turn.

    3.) Hanging the cranks off the bottom elimiates the additional top
    support strut (the crown) in the frame so it would be more likely to
    flex.

    4.) The chain tensioning mechanisms would suddenly become much more
    complex.

    These problems exist but it doesn't mean that they can't be overcome or
    some compromises can't be made. You should build one.

    --
    harper - TANKED at GASWORKS

    -Greg Harper

    B L U E S H I F T

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    riding through a cactus patch..." -evil-nick on "Entry of the
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  17. Dirtsurfer said:

    *Out of curiousity, have you thought about making it a low rider
    (mounting the cranks below the hub)? *

    If I look at the frame photo I see four problems with that idea.

    1.) It appears that the crank axis to axle axis distance is about 6" or
    a crank length. For a moderate sized wheel the design would exclude
    people who don't have that extra 6" of inseam. Actually, 12" of extra
    inseam going from one design to the other would be required. George has
    it and wouldn't care, though.

    2.) The crank axis would be close to the ground and with a small enough
    wheel some serious pavement strikes could be made on the pavement with
    the pedals during a turn.

    3.) Hanging the cranks off the bottom eliminates the additional top
    support strut (the crown) in the frame so it would be more likely to
    flex.

    4.) The chain tensioning mechanisms would suddenly become much more
    complex.

    These problems exist but it doesn't mean that they can't be overcome or
    some compromises can't be made. You should build one.

    --
    harper - TANKED at GASWORKS

    -Greg Harper

    B L U E S H I F T

    "My world view has come crashing down like a drunk clown on a giraffe,
    riding through a cactus patch..." -evil-nick on "Entry of the
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  18. john_childs said:

    * I experienced a Coker UPD at about 17.5 mph and ended up sliding on
    the ground in a superman position. *

    After all the quotes and stories about the great JC and unicycles, I
    would expect that you would literally fly away Superman style. My
    uni-hero may be mortal.... Oh No! Sorry JC, but you don't get many
    style points for flying that low to the ground.

    The stories from you and Harper are making me think that I might go for
    another speed attempt on my coker. I've hit 16+ a couple of time but it
    would be fun to bump that up a little. It will definitely be a full
    gear attempt if done. Maybe a fall or two won't stop me from going to
    work the next day.

    Bill

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  19. Dirtsurfer said:

    *Out of curiousity, have you thought about making it a low rider
    (mounting the cranks below the hub)? Realistically, you won't be
    doing much offroading, wouldn't lower your center help some? How
    would changing the pivot at the center of the wheel effect the ride? *


    Wow, that would be a very odd feeling wouldn't it? When you lean (or
    loose your balance) forwards, your feet would be sent backwards...very

    odd.harper said:

    *3.) Hanging the cranks off the bottom eliminates the additional top
    support strut (the crown) in the frame so it would be more likely to
    flex.*


    Couldn't you stick something between (and connected to) the two chain
    rings to reduce flex?

    Andrew

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  20. andrew_carter said:

    *Couldn't you stick something between (and connected to) the two chain
    rings to reduce flex?

    *

    Through the spokes, or around the wheel?

    --
    harper - TANKED at GASWORKS

    -Greg Harper

    B L U E S H I F T

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