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| Re: Determining braking distance (581435) | |||
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Re: Determining braking distance |
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Posted by JournalSquare-K-Car on Wed Mar 5 22:57:58 2008, in response to Re: Determining braking distance, posted by Jeff H. on Wed Mar 5 20:28:57 2008. I had a feeling it wasn't linear at all. Especially when you are going 7 miles an hour, and the T/O (on older SMEES, 32-42s) yanks the handle, you hear the shoes bong against the wheels, a short screech, and stop- all under one second.7 mph/s decel rate? Maybe at those slow, less than eight miles, speeds. Train has a lot les kinetic energy, the wheels are moving slowly, and if the wheels do slip, it will only be for a fraction of a second, so no flats. Also, passengers are moving slowly, so they don't loose much of their balance. NYCTA Cars have no DECEL problems, it is Acceleration where the problem lies, and low top speed. Especially when a train approaches a standard 4 car marker at 30+ miles. BTW, PCC specs called for 9.0Mph/s maximum deceleration at 20 miles. |
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