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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
People like bicycle, do not like tricycle or quadracycle--4 wheels
bike, because on bicycle only two wheels touch the ground (minimum friction), also is easy and safe to be ridden. Ideally cyclist should like to ride a unicycle, because friction only existed between one wheel and the ground (cut friction in half compare with on a bicycle), but ride a unicycle need special skills and not safe. Based on a normal bicycle, this "Half Bicycle" modified some parts: Cyclist’s set is moved backward (also hand-bar is extended backward), to make sure centre of gravity of the bicycle is around on back wheel B. |
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#2
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
wrote: (clip) This means friction between wheels and the ground is cut in half. In other words this bicycle only needs half amount of human power to travel in same speed (or same distance) as a normal bicycle.(clip) ^^^^^^^^^^^^^^^^^^^ Air friction doesn't count? |
#3
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
wrote:
People like bicycle, do not like tricycle or quadracycle--4 wheels bike, because on bicycle only two wheels touch the ground (minimum friction), also is easy and safe to be ridden. Ideally cyclist should like to ride a unicycle, because friction only existed between one wheel and the ground (cut friction in half compare with on a bicycle), but ride a unicycle need special skills and not safe. Based on a normal bicycle, this "Half Bicycle" modified some parts: Cyclist’s set is moved backward (also hand-bar is extended backward), to make sure centre of gravity of the bicycle is around on back wheel B. Cyclist can ride this bicycle as a normal bicycle by moving centre of gravity toward front. If road condition is good, cyclist want to increase speed, he can move centre of gravity backward little bit and make sure the centre of gravity is on back wheel B. At the same time, front wheel A will be left from the ground, the bicycle becomes a unicycle, only wheel B touches the ground. This means friction between wheels and the ground is cut in half. In other words this bicycle only needs half amount of human power to travel in same speed (or same distance) as a normal bicycle. Oh, where to start? OK, to address your last statement first, you assume that the friction of tires on the ground are the only source of loss for a moving cyclist. If only it were so! None of us here would ever have to resort to the use of a motor vehicle. Second, you seem to assume that rolling resistance is proportional to the number of tires in contact with the ground. That is not correct. Gross rolling resistance varies more directly in proportion to the load being carried, almost irrespective of the number of tires carrying that load. A third thing you seem to have missed is that tire friction losses in trikes and quadricycles are mainly due to disagreements between wheels as to their orientation versus their direction of travel, especially in turns. My sidecar wears out its rear tires very quickly due to major tire scrub, because any time it is moving in a non-straight path, the two rear tires are traveling along substantially different radii while pointing in the same direction. There is no getting around this tendency with a vehicle that has directionally fixed wheels riding in separate tracks. http://datribean.com/chalo/images/chair1.jpg http://datribean.com/chalo/images/chair4.jpg In the case of this vehicle, making a tight turn with a load in the sidecar is tantamount to applying the brakes. Chalo |
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
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#5
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
On Oct 1, 2:10*pm, wrote:
People like bicycle, do not like tricycle or quadracycle--4 wheels bike, because on bicycle only two wheels touch the ground (minimum friction), also is easy and safe to be ridden. Ideally cyclist should like to ride a unicycle, because friction only existed between one wheel and the ground (cut friction in half compare with on a bicycle), but ride a unicycle need special skills and not safe. Based on a normal bicycle, this "Half Bicycle" modified some parts: Cyclist’s set is moved backward (also hand-bar is extended backward), to make sure centre of gravity of the bicycle is around on back wheel B. Cyclist can ride this bicycle as a normal bicycle by moving centre of gravity toward front. If road condition is good, cyclist want to increase speed, he can move centre of gravity backward little bit and make sure the centre of gravity is on back wheel B. At the same time, front wheel A will be left from the ground, the bicycle becomes a unicycle, only wheel B touches the ground. This means friction between wheels and the ground is cut in half. In other words this bicycle only needs half amount of human power to travel in same speed (or same distance) as a normal bicycle. More detail and pictures onwww.freelights.co.uk/bike.html This is absolute nonsense. When riding a wheelie, far more energy is expended maintaining balance than could possibly be lost to rolling resistance. |
#6
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
Chalo wrote:
wrote: snip absurd claims of halving power and your correct rebuttal A third thing you seem to have missed is that tire friction losses in trikes and quadricycles are mainly due to disagreements between wheels as to their orientation versus their direction of travel, especially in turns. My sidecar wears out its rear tires very quickly due to major tire scrub, because any time it is moving in a non-straight path, the two rear tires are traveling along substantially different radii while pointing in the same direction. There is no getting around this tendency with a vehicle that has directionally fixed wheels riding in separate tracks. http://datribean.com/chalo/images/chair1.jpg http://datribean.com/chalo/images/chair4.jpg In the case of this vehicle, making a tight turn with a load in the sidecar is tantamount to applying the brakes. Chalo With the sidecar wheel staggered forward from the rear wheel, there can never be a common center of radius for all three wheels, except in a straight line (infinite turn radius). But if the rear wheel and sidecar wheel were on the same line perpendicular to forward travel, you would not have this scrub problem. It may not be practical to do this and still keep the center of gravity safely well within the triangle of tire contact patches. Interesting vehicle. Dave Lehnen |
#7
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
someone wrote:
People like bicycle, do not like tricycle or quadracycle--4 wheels bike, because on bicycle only two wheels touch the ground (minimum friction), also is easy and safe to be ridden. Ideally cyclist should like to ride a unicycle, because friction only existed between one wheel and the ground (cut friction in half compare with on a bicycle), but ride a unicycle need special skills and not safe. Based on a normal bicycle, this "Half Bicycle" modified some parts: Cyclist’s set is moved backward (also hand-bar is extended backward), to make sure centre of gravity of the bicycle is around on back wheel B. I think you have your telecope on backward and are seeing spooks where they are not. Bicycling has two significant losses, that of wind drag and climbing hills. Rolling along on flat ground is close to effortless until speed aprochaes aeroynamic losses. Wheel bearings and road contact represent trivial and insignificant losses that only becom significant in competition where riders travel about three or more times as fast as transportation bicyclsts. Cyclist can ride this bicycle as a normal bicycle by moving centre of gravity toward front. If road condition is good, cyclist want to increase speed, he can move centre of gravity backward little bit and make sure the centre of gravity is on back wheel B. At the same time, front wheel A will be left from the ground, the bicycle becomes a unicycle, only wheel B touches the ground. This means friction between wheels and the ground is cut in half. In other words this bicycle only needs half amount of human power to travel in same speed (or same distance) as a normal bicycle. More detail and pictures on www.freelights.co.uk/bike.html Spare me the exercise. This whole idea is based on incorrect beliefs. Jobst Brandt |
#8
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A Bicycle Can Cut Friction in Half, called "Half Bicycle"
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