h a l f b a k e r yI didn't say you were on to something, I said you were on something.
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It's both for adjustable resistance, and to avoid having a long and potentially dangerous chain going the length of the bicycle. |
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Also, as a result of dirt and weather, a chain and sproket's mechanical efficiency can be as low as 80%, while a hydraulic system will have about 95% efficiency in all conditions. |
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As for weight... if the bicycle could be designed so that the hydraulic pipes double as structural elements, it wouldn't necessarily be heavier than a chain driven bicycle. |
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I love it. Weight be damned, hydraulics are among the most complex and least practical ways that a Halfbakery idea can be achieved, and I'm all for them for that reason. |
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Still working on a hydraulic cellphone. |
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Not bad, but a tandem recumbent would be very long.
If you don't like chains and want independent tandem drive, use drive shafts and a differential at the back ('inside-out' relative to a car - input through the two sides and output from the 'body'). Each rider can pedal as they please, and both supply power. |
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I think the most appealing thing about a hydraulic bicycle (for me, anyway) is the possibility of front wheel drive. |
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neutrinos_shadow, how do you propose that the power from the front pair of pedals (which are above and in front of the front wheel) go around / under / over the front passenger?
lurch, Why front wheel drive? Surely all wheel drive would be more useful? |
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Nope, I disagree with all-wheel drive. More complicated, heavier, less efficient, and for what? So you won't get stuck? Unlike a car, you can get off and pick it up. I like front wheel drive because there would be no tendency to "wheelie" going up a hill; because it can pull your front end around a corner with more authority, rather than pushing out and sliding; and because you can turn up to and past the perpendicular position of the front wheel while still riding. |
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//I think the most appealing thing about a hydraulic
bicycle (for me, anyway) is the possibility of front wheel
drive.// |
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There have been many examples of 2wd dirt bikes, it's
easy to get enough power from a motorcycle engine and
there's definitely more weight budget than a bicycle, yet
they're not popular. I think it's because you don't gain
anything. You can't really get better off road performance
than a well-ridden dirt bike. It might actually be an
example of solving problems with simplicity/removing
things rather than adding. |
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Take a car, drive it off road, get stuck, have a look at the
problem. "Ah, see, all the weight is on these wheels and
they're not driven... let's drive all the wheels". |
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"Well, that's much better, but I'm still getting stuck... how
about 6 driven wheels" |
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"I get stuck infrequently, but we can do better... tracks!" |
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Instead a dirt bike removes complexity. Problems with
open differentials spinning one wheel? Remove the wheel
& differential. Car weight over non-driven wheels? Only 2
wheels means weight is always on the driven wheel. Add a
rider who can move around and the problem largely
disappears. The only problem with the concept arrives
when the rider becomes a small fraction of the mass.
Making the Cargo Dirt Bike a non-starter. |
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