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"Brad Hamilton" <bhamilto1@home.com> wrote in message
news:G7spqq.H3E@lugnet.com...
> That's really nice. I've made attempts at train bridges before, but never
> been very successful.
Thanks.
> Out of curiosity, did you copy a real bridge design, or did you design it
> yourself? I'm especially interested in the double-spiral on the one side • of
> the bridge.
I'll admit, I did use some reference from a book titled "The Way Things
Work"(I honestly don't know if it's still being published, c1967) or I'd
advise going to a good bookstore or library and check out the architecture
or engineering sections for anything.
That spiral within spiral layout took a while to get right. You'll have to
pull out the graphic calculator for this part but I thought of basing the
ramp plan on
p ( rho) = (b) + (a)(cosine theta) , a > b, AKA Limacion of Pascal (forgive
my French). OK, so I had to "warp it" to make it work but as long as it
does, I'm happy. I try to take more shots for another site to provide more
detailed instruction to those wanting to try and build one.
Adrian
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