Subject:
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Re: Building a three-foot bridge
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Newsgroups:
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lugnet.trains, lugnet.znap
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Date:
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Fri, 24 Jan 2003 03:15:05 GMT
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Viewed:
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3416 times
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In lugnet.trains, Brian Kendig writes:
> I want to build a bridge to cross a one-meter gap between two train
> platforms. The bridge must hold two straight lengths of track, spaced
> with one trackwidth between them (the distance there would be if you
> snapped two cross-intersection track pieces together).
>
> The platforms themselves are a meter off the ground, so putting a
> support in the middle of the span isn't feasible.
>
> Two years ago I grabbed one of every Znap set from a TRU clearance.
> I've been using that to try to build a beam bridge. I've gotten the
> beam reasonably rigid, but my problem right now is that it twists very
> easily, and I can't figure out how to support against that.
>
> Any tips on how to build a sturdy one-meter-long bridge out of Znap
> and/or Technic while being somewhat miserly with the pieces, so I don't
> run out? And any tips on how to reinforce against twisting would be
> greatly appreciated, thanks!
Well, Brian, I can say one of my 60 inch long ZNAP bridge twisted and
collapse at a train show, with the GFLTC (no pics). Two trains fell 30+
inches to the ground out side in the dirt! The best bet for a ZNAP bridge is
to support the track on both side with walls or three support walls with two
tracks. The bridge that collapse only had side walls, no wall in the center.
Here are some examples:
Two ZNAP bridges at GATS Orlando (30in long):
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62456
Twin track ZNAP bridge at GATS Tampa (30in long):
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=127169
Twin track ZNAP bridge at FLBG Largo (41in long) upper left:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=282855
Working draw bridge NMRA NTS Ft. Lauderdale (30in long):
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=216610
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=216611
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=216612
Hope this helps,
Robin W
GFLTC - www.gfltc.org
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Message is in Reply To:
 | | Building a three-foot bridge
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| I want to build a bridge to cross a one-meter gap between two train platforms. The bridge must hold two straight lengths of track, spaced with one trackwidth between them (the distance there would be if you snapped two cross-intersection track (...) (21 years ago, 23-Jan-03, to lugnet.trains, lugnet.znap)
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