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  1. #16

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    Re: A question about the Peoplemover

    Quote Originally Posted by DLandFansAZ View Post
    So when they changed it over to the Rocket Rods what propulsion system did they use? I know it didn't stay the tires and that the entire track system changed. Didn't the Rocket Rods propell themselves and that was part of the proplem keeping them powered?
    I seem to recall that one of the problems with Rocekt Rods was that they went through tires once or twice a week per car so they did use tires for movement.
    It may have zippity to do with doo-dah

  2. #17

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    Re: A question about the Peoplemover

    Quote Originally Posted by DLandFansAZ View Post
    So when they changed it over to the Rocket Rods what propulsion system did they use? I know it didn't stay the tires and that the entire track system changed. Didn't the Rocket Rods propel themselves and that was part of the problem keeping them powered?
    I'll try to keep this simple - They changed the whole system and BOY was it a problem.

    Peoplemover running gear: Two steel I-beam tracks with polyurethane over steel wheels, and roller-coaster style guide/check tires to prevent derailments. Simple power tracks along the rail for car lighting and audio track power. Simple control system to control car spacing on the few speed-up and slow-down spots.

    Rocket Rods: Single round steel tubing track down the middle of the beam, with two flat concrete tracks for the rear wheels. Wheel tracks for propulsion, coated with very aggressive epoxy traction paint with sand in it as used on aircraft carrier decks (that chewed the tread off tires).

    Front end of car rides on Polyurethane tired steel wheels. Rear end rides on pneumatic truck tires and is guided by small coaster wheels off the guide track - but they used a solid axle and don't have the steering geometry of the guide wheels right (I think the problem is called thrust angle...) so there is tire scrub on every turn.

    Propulsion and braking are done with the truck tires - cars have on-board air compressors and tanks, and heavy truck style air brakes. Works fine when dry, but any wheel slip or skidding on braking in the wet flat-spots and chews up the tires. And there are sensors everywhere and any anomalous readings trigger Safe Mode till that car can be unloaded and pulled offline for repair.

    Car control is a very complex distributed system with a computer on each car and several Master Control "Wayside" computers conducting the orchestra in parallel - fail-safed so if they Wayside computers disagree about what to do next the whole system goes to Safe Mode. All cars start creeping at 2 MPH so they can get back to the station and unload everyone.

    Communications between cars and Wayside done over data pickups and rails, with a backup radio system - and if either one fails it's Safe Mode time.

    Notice that there are a lot of mentions of excessive wear and going into Safe Mode...

    --<< Bruce >>--
    There's No Place Like 127.0.0.1

  3. #18

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    Re: A question about the Peoplemover

    Wow that is some amazing information Bruce! How does one go about acquiring knowledge such as that?

  4. #19

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    Re: A question about the Peoplemover

    Quote Originally Posted by Dusty88 View Post
    Wow that is some amazing information Bruce! How does one go about acquiring knowledge such as that?
    Two Mark One eyeballs, one inquiring mind, some rather keen observation skills, many years of fixing stuff like that for a living - often with no blueprints or manuals, a decent memory for sometimes useless details that may later turn out to be vitally important... Oh, and no life.

    A lot of it is visible right out in the open if you know what to look for.

    Other things you can pick up through the other senses, like hearing the hiss and pop noises and knowing they are air brakes. Then you look under the fender at the station and see the little industrial electronic pressure regulator (ITV-2000 series by SMC, or eq.) being used as a brake control valve, as the digital output pressure readout rolls up from 0 to 40 as the brakes are applied. Nifty way to let the computer do it all by itself, with positive feedback that pressure has arrived.

    --<< Bruce >>--
    There's No Place Like 127.0.0.1

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