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#12
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If you really got a good idea, just go to a machine shop, they are
fully able to fabricate all the parts for your average bicycle. A prototype would be expensive, but after the initial tooling, the price drops alot. Don't sell your idea to someone else, they will convince you they are doing you a big favor and make you pay them, then make a fortune off your idea. Pay the metal fabricator to make your parts for you, and use a mix of your special, unique parts with available, mass produced parts, that would be the way to go. I know what you're saying about how just about everything to be thought of has already been thought of, but it just seems like they could make a bike with greater mechanical advantage that what they go, you know. The power of your pedal, which is a lever, and the diameter of the sprocket determine your mechanical advantage, but if you increases the length of the pedal lever, you increase the leverage. It just seems like , with all these new super strong materials, there would be no limit to the mechanical advantage you could employ, using leverage in longer pedals, that don't make whole circles, but rather winch style propulsion, pedals a foot or two long, quadrupling mechanical advantage, or larger diameter sprockets, up higher between the legs so they don't hit the ground. Seems to me so many simple, basic ways to increase mechanical advantage, but I think people don't do it because of aesthetics and simplicity. If you could quadruple the mechanical advantage though, by increased leverage in the pedal and sprocket diameter, you're talking about the ability to bike on a touring bike, an average of 50-60 mph, you're talking about an effective human powered replacement for the automobile, that or a 30 mph average and the ability to haul materials through human powered machinery. |
#13
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Rush Cocoo writes:
I know what you're saying about how just about everything to be thought of has already been thought of, but it just seems like they could make a bike with greater mechanical advantage that what they go, you know. The power of your pedal, which is a lever, and the diameter of the sprocket determine your mechanical advantage, but if you increases the length of the pedal lever, you increase the leverage. The way you use the terms makes clear you do not understand the real limitations of bicycle performance. You mix mechanical advantage and power as though they were the same. The gears of current bicycles offer a range of mechanical advantage greater than what a human can use effectively. What the rider does not have is more POWER and it is power that limits performance. If you could quadruple the mechanical advantage though, by increased leverage in the pedal and sprocket diameter, you're talking about the ability to bike on a touring bike, an average of 50-60 mph, you're talking about an effective human powered replacement for the automobile, that or a 30 mph average and the ability to haul materials through human powered machinery. We are able to quadruple the ME of the drive mechanism with current gearing. Many bicycles have 1:1 to 4:1 ratios in 36t to 36t up to 52t to 11t or 4.7:1 ratio. What more do you wish to do. These gears exceed what any bicycle road racer can and does use. You'll find that professional racers use a far smaller gear range because a greater one would lie beyond their power. Please study the concepts before trying to argue that bicycle gearing is inadequate. Jobst Brandt |
#14
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no, the pedal lever, asshole, leverage increases power. the longer
the lever, the greater the power. I"m talking about increasing the length of the pedal lever. The thought of telling an asshole like you a great idea makes me sick however. |
#15
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#16
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On 3 Oct 2004 12:32:47 -0700,
(BringYouToLife) wrote in message : which exerts more force on the load of a lever, a 4 foot lever or a 1 foot lever? The pedal lever on most bikes is under a foot long. If you increase the length of the lever,the power or force increases. Jobst is right: you don't understand. Lengthening the cranks increases torque but the power input is still limited by what the rider can put in. Power is torque x angular velocity. How fast can you spin a 300mm crank? Guy -- May contain traces of irony. Contents liable to settle after posting. http://www.chapmancentral.co.uk 88% of helmet statistics are made up, 65% of them at Washington University |
#17
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The pedal lever is the part that extends from the main torque axle, to
the actual pedal. On your average bike it's about 7 inches from the pedal to the axle. That's a 7 inch lever. Not even making any changes to the frame of my bike, if you put the main torque axle on the front wheel, your feet would be in the same position, and you would have a nearly 35 inch lever, this would be 5 times more power through mechanical advantage. The motion would be that of a ratchet wrench, pushing down, then it would slide back up, you could pull the pedal back up stirrups or locking biking shoes. with 5 times more power, you could use a much larger diameter gear on the front. This means you could go 5 times faster, or also, carry 5 times as much stuff with the same effort. So if you weigh 200lbs, you could then transport 1000 lbs with the same effort. 5 people peddling a truck could transport 5,000 lb loads. Human powered flight could become a reality as well. |
#18
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#19
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the US patent office has a data base of all images and patents issues,
and yes, even all patents APPLIED for, for God's sakes, the internet is awesome. I did a search for all patents issued from 1790 to present for 'bicycle' and got 15,839 results. http://patft.uspto.gov/netacgi/nph-P...FIELD2=&d=ptxt http://patft.uspto.gov/netahtml/search-bool.html just go to above link and type 'bicycle' |
#20
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(BringYouToLife) wrote:
increasing the length of the pedal lever to four times the length of your current pedal lever will increase your power 4 times. Look up 'levers' on the internet before you open your silly mouth. Probably should have tried to continue this obvious troll with something a LITTLE less obvious... you woulda hooked more that way. Mark Hickey Habanero Cycles http://www.habcycles.com Home of the $695 ti frame |
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