Subject:
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Re: APT tilts thru curves in Real-Build ABS form
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Newsgroups:
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lugnet.trains
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Date:
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Tue, 26 Jun 2001 21:55:46 GMT
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Viewed:
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2347 times
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In lugnet.trains, Christopher Masi writes:
> James Mathis wrote:
> >
> > My attempt to model the British Rail Advanced Passenger Train set is
> > progressing. The "real-build" ABS consist is:
> > 1. cab unit (driver trailer second)
> > 2. passenger car (trailer second)
> > 3. passenger car (trailer brake first)
> > 4. motor unit (non driving motor)
> > 5. passenger car (trailer brake first)
> > 6. cab unit (driver trailer second)
> >
> > The names in parenthesis are the British Rail nomenclature.
> >
> > 1) The train cars do indeed tilt through curves. The pendular axis of
> > rotation is just below the roof-line; thus, the car bodies swing "out"
> > rather than tip "in". I'm not sure that is the best way to describe this
> > motion???
> >
> > 2) There is no pancake gap between the wheels/trucks/bogies and the main
> > frame of the cars.
> >
> > 3) The height of the train is equivalent to a standard official LEGO
> > passenger train.
> >
> > 4) Typical gaps do exist between the ends of the wheels/trucks/bogies and
> > the ends of the inverse undercarriage.
> >
> > 5) 9v train motors are located on the "non-driving motor" unit, as is
> > prototypical.
> >
> > See this APT in ABS at:
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?f=5195
> >
> > Still need to order bunches of blue train windows.
> > Still need to order some blue train doors.
> > Black 2x2 tiles...
> >
> > I found it a little difficult to photograph the tilt. I hope some of the
> > pictures convey that it really is tilting!
> >
> > I hope to be able to make another "non-driving motor" and another "trailer
> > second", or perhaps the "restaurant/buffet first" car. I think an 8 unit
> > real-build LEGO version of the APT might be near the limit of this
> > simultaneous push-pull configuration with the 9v motors in the middle of the
> > set.
> >
> > I think the APT-P (pre-production prototype) is the unit that saw
> > revenue-paying service: 250 km/h 2+12 high-powered version (Three prototype
> > trains were built). You can see very cool drawings of the proposed APT sets
> > at The Railway Age, a home for the Preservation of the APT train set.
> > http://www.therailwayage.co.uk/apt/APTConfigurations.htm
> > You can click on some of the drawings to see floor plans of the interiors.
> >
> > You may notice that the real-life APT set does not have a blue-window livery.
> > From the photos it looks more slate blue, dark gray, ????? Also, the roof
> > is more white than gray. It's tough for me to tell. White would be a
> > reasonable LEGO color for the roof. Alas, I've chosen gray for the time
> > being....
> >
> > Thanks for reading and looking.
> >
> > later,
> > James Mathis
>
> You are a genius. Here I am spending my weekend building Mini's[1] while you are
> building an APT. It looks great, and the pendular mechanism is simply the result
> of the centripetal force, right? Very nicely done.
The pendular mechanism has a lever-arm-wedge that pushes "out" and "up" on
the undercarriage. The tilt could be the result of the centripetal force
through a curve, but weight of the car and the "zero" gap above the bogie
plate between the undercarriage prevents the "swing" out of the wagon body.
Thus, I had to configure some kind of lever to push the lower part of the
body "out" while allowing the body to also lift up. It puts quite a stress
on the wheels against the rails of the track as it is very much the case
that the rotation of the wheel/bogie through a curve is the force to make
the wagons tilt.
> 1. I mention the Mini only because it originated in England too.
Ah, I have fond memories of riding around Lincolnshire in a Mini in 1981! :-)
The driver was a huge man over 6 feet tall! Either he was a pretzel or that
Mini was Dr. Who's Tardis ;-)
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Message has 1 Reply:
Message is in Reply To:
 | | Re: APT tilts thru curves in Real-Build ABS form
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| (...) You are a genius. Here I am spending my weekend building Mini's[1] while you are building an APT. It looks great, and the pendular mechanism is simply the result of the centripetal force, right? Very nicely done. Chris 1. I mention the Mini (...) (25 years ago, 26-Jun-01, to lugnet.trains)
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