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#161
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Bicycle Stopping Distances
In article ,
MagillaGorilla wrote: RicodJour wrote: On Nov 10, 10:32Â*am, " wrote: On Nov 9, 3:18Â*pm, MagillaGorilla wrote: RicodJour wrote: On Nov 7, 4:28Â*pm, " wrote: On Nov 7, 6:44Â*am, MagillaGorilla wrote: Correct, but when it's pulling away from the stays, the only thing keeping it there is the mounting bolt. Â* All the stress of the braking is transfered through the mounting bolt and nut. The bolt itself bends and is not inelastic. And the hold that the bolt goes through is not perfectly flush with the bolt. Â*But on the front brake, the entire brake caliper assembly is being forced into the frame which is for the most part immovable and thus gives better stability. I get a ****ing headache every time I read that. Â*I don't have my stupid-to-English translator engaged, so tell me this, Batbuoy, are you arguing that a loose brake bolt is what makes the difference? If not, and the braking force is the same, as it must be, and all braking force is transmitted to the frame, as it must be, where does this extra braking force come from? Â*The bolt, submitted to the same force in either mounting position, will deflect the same amount as the difference in geometry is negligible. Â*Much like your argument. No no no no. Â*The front brake transfers most of the force through the mating surface of the caliper to the FORK. Â*The front bolt transfers probably 30% of the force. Â*On the rear brake, the bolt transfers nearly 100% of the force. Â*It is true that all the force is ultimately absorbed by the frame. Â*But the design of the front bake via its placement on the front of the FORK makes it a more stable design under high loads and high speeds. Â*Ask any frame builder/engineer. Harry Havnoonian is a frame builder AND mechanical engineer (degree from Drexel). Â*He mounts the rear brake in front of the seat stays for this very reason and has been doing it for over 20 years. Â*Give him a call and he'll tell you why: http://www.hhracinggroup.com/page6.html Jesus Christballs. When a bike moves FORWARD the top of the rim is moving FORWARD and when you brake, the frictional force of the rim on the brake tries to pull the brake FORWARD. Â*You appear to be pedaling your monkey-bike BACKWARD. I think I have found the problem. Nim Chimpsky IS riding backwards. At least he's wearing his helmet. http://www.ape-o-naut.org/famous/fam...mages/ham1.jpg R = retard R = recycling fifth grade retorts. More fun than a barrel of monkeys, but you are scraping bottom. -- Michael Press |
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#162
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Bicycle Stopping Distances
In article ,
MagillaGorilla wrote: " wrote: On Nov 9, 3:18Â*pm, MagillaGorilla wrote: RicodJour wrote: On Nov 7, 4:28Â*pm, " wrote: On Nov 7, 6:44Â*am, MagillaGorilla wrote: Correct, but when it's pulling away from the stays, the only thing keeping it there is the mounting bolt. Â* All the stress of the braking is transfered through the mounting bolt and nut. The bolt itself bends and is not inelastic. And the hold that the bolt goes through is not perfectly flush with the bolt. Â*But on the front brake, the entire brake caliper assembly is being forced into the frame which is for the most part immovable and thus gives better stability. I get a ****ing headache every time I read that. Â*I don't have my stupid-to-English translator engaged, so tell me this, Batbuoy, are you arguing that a loose brake bolt is what makes the difference? If not, and the braking force is the same, as it must be, and all braking force is transmitted to the frame, as it must be, where does this extra braking force come from? Â*The bolt, submitted to the same force in either mounting position, will deflect the same amount as the difference in geometry is negligible. Â*Much like your argument. No no no no. Â*The front brake transfers most of the force through the mating surface of the caliper to the FORK. Â*The front bolt transfers probably 30% of the force. Â*On the rear brake, the bolt transfers nearly 100% of the force. Â*It is true that all the force is ultimately absorbed by the frame. Â*But the design of the front bake via its placement on the front of the FORK makes it a more stable design under high loads and high speeds. Â*Ask any frame builder/engineer. Harry Havnoonian is a frame builder AND mechanical engineer (degree from Drexel). Â*He mounts the rear brake in front of the seat stays for this very reason and has been doing it for over 20 years. Â*Give him a call and he'll tell you why: http://www.hhracinggroup.com/page6.html Jesus Christballs. When a bike moves FORWARD the top of the rim is moving FORWARD and when you brake, the frictional force of the rim on the brake tries to pull the brake FORWARD. You appear to be pedaling your monkey-bike BACKWARD. Are you a fixed gear hipster, or worse yet, a trackie? What do trackies know about brakes anyway? Listen up. The bolt acts as a fulcrum So when one end of the seesaw goes up the other must go down. It's a physics equation. You would not know a physics equation if it ran up and tore your face off. Which of the following are physics equations? H Psi = E Psi I_zx = int rho(x,y,z) dz dx v = (V + v')/(1 + V.v'/cc) d @L @L dq -- -- - -- = 0, v = -- . dt @v @q dt div E = 4.pi.rho Who loves you, Baby = Your Mama. -- Michael Press |
#163
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Bicycle Stopping Distances
On Nov 10, 11:28*pm, Michael Press wrote:
In article , *MagillaGorilla wrote: " wrote: On Nov 9, 3:18*pm, MagillaGorilla wrote: RicodJour wrote: On Nov 7, 4:28*pm, " wrote: On Nov 7, 6:44*am, MagillaGorilla wrote: Correct, but when it's pulling away from the stays, the only thing keeping it there is the mounting bolt. * All the stress of the braking is transfered through the mounting bolt and nut. The bolt itself bends and is not inelastic. And the hold that the bolt goes through is not perfectly flush with the bolt. *But on the front brake, the entire brake caliper assembly is being forced into the frame which is for the most part immovable and thus gives better stability. I get a ****ing headache every time I read that. *I don't have my stupid-to-English translator engaged, so tell me this, Batbuoy, are you arguing that a loose brake bolt is what makes the difference? If not, and the braking force is the same, as it must be, and all braking force is transmitted to the frame, as it must be, where does this extra braking force come from? *The bolt, submitted to the same force in either mounting position, will deflect the same amount as the difference in geometry is negligible. *Much like your argument. No no no no. *The front brake transfers most of the force through the mating surface of the caliper to the FORK. *The front bolt transfers probably 30% of the force. *On the rear brake, the bolt transfers nearly 100% of the force. *It is true that all the force is ultimately absorbed by the frame. *But the design of the front bake via its placement on the front of the FORK makes it a more stable design under high loads and high speeds.. *Ask any frame builder/engineer. Harry Havnoonian is a frame builder AND mechanical engineer (degree from Drexel). *He mounts the rear brake in front of the seat stays for this very reason and has been doing it for over 20 years. *Give him a call and he'll tell you why: http://www.hhracinggroup.com/page6.html Jesus Christballs. When a bike moves FORWARD the top of the rim is moving FORWARD and when you brake, the frictional force of the rim on the brake tries to pull the brake FORWARD. *You appear to be pedaling your monkey-bike BACKWARD. *Are you a fixed gear hipster, or worse yet, a trackie? *What do trackies know about brakes anyway? Listen up. *The bolt acts as a fulcrum *So when one end of the seesaw goes up the other must go down. *It's a physics equation. You would not know a physics equation if it ran up and tore your face off.. Which of the following are physics equations? H Psi = E Psi I_zx = int rho(x,y,z) dz dx v = (V + v')/(1 + V.v'/cc) * *d *@L * @L * * * * * *dq * * * * * *-- -- - -- *= 0, *v = -- . * *dt @v * @q * * * * * *dt div E = 4.pi.rho Who loves you, Baby = Your Mama. -- Michael Press e to the u, d u d x e to the x, d x cosine secant tangent sine 3.14159 integral of u d v slipstick, slide rule, MIT we're not rough and we're not tough but BOY are we smart How many other engineering schools have that same stupid cheer? One thing about engineers - they're not often the most creative lot, and they like to steal other people's work. This is how I know Nim isn't an engineer. He just makes up **** as he goes along. R |
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