On 5/19/2018 11:02 AM, Jeff Liebermann wrote:
On Sat, 19 May 2018 07:40:08 -0500, AMuzi wrote:
On 5/19/2018 2:34 AM, Jeff Liebermann wrote:
On Fri, 18 May 2018 20:02:04 -0500, AMuzi wrote:
Go though the linked brochure images. It's amateurish IMHO.
I didn't see a link to a brochure.
Maybe this is what you're thinking of:
https://books.google.com/books?id=4bSABo8Akh4C&pg=PA105&lpg=PA105#v=onepage &q&f=false
It sure doesn't look like it were made from any form of known plastic.
Oh, now I see why:
"Although this prototype had many steel parts, final
model is scheduled to have plastic frame, forks, handlebars,
gears, chain, hubs, and derailleur. Rim and cranks will
be alloy."
I wanna see the plastic gears in action. In other words, what you see
in the "prototype" photo is nothing even close to what is described,
planned, or expected.
Try this catalog link:
http://www.velo-pages.com/main.php?g2_itemId=27603
notably:
http://www.velo-pages.com/main.php?g2_itemId=27633
http://www.velo-pages.com/main.php?g2_itemId=27633&g2_imageViewsIndex=1
In 1973, we didn't have Photoshop, so the pictures look like they
might have been colorized in a darkroom onto film or paper using color
filters. The sharp edges on the various parts suggest that the parts
were not painted, which would have more rounded edges. The crankset
shows threaded hardware, without metal inserts, which is unlikely to
be the way a plastic crankset would be built. There's also no
indication of any tooth wear, which is what I would expect with a
plastic gear and a steel chain. The parts shown look exactly like the
metal equivalents, which is too much of a coincidence to be
believable. Plastic is much weaker than metal and therefore requires
thicker parts, reinforcing ribs, and metal inserts. The resulting
plastic bicycle would look very different, especially if the frame was
molded or vacuum formed. For example:
https://bikerumor.com/2015/12/28/the-placha-plastic-concept-bike/
https://inhabitat.com/colorful-frii-concept-bike-is-built-from-injection-molded-recycled-plastic/
http://www.yankodesign.com/2014/12/03/print-on-demand-bicycle/
http://www.yankodesign.com/2009/03/27/foldable-bicycles-how-real-today/
http://www.yankodesign.com/2008/10/20/a-new-way-to-bike/
http://www.yankodesign.com/2008/03/21/one-seriously-tight-light-bike/
http://www.yankodesign.com/2010/09/24/15-amazing-bicycles-for-the-future-of-seoul/
etc. Soon, everyone will be riding on mass produced plastic bicycles.
And in your link the Weinmann DiaCompe #144 lever (inset #1)
is distinctive and recognizable, unmodified except for
color. Chain (insert #2) is not polymer. The Cyclo chainring
set below that is a standard part shown colored (paint?
image manipulation?) as is the Atom-Regina freewheel.
I always assumed the top left whatchacallits were non-bike
subterfuges or distractions, one of which sits posed on a
bicycle sprocket as misdirection. I could be wrong.
I agree that polymer materials, forming techniques
(injection or positive layering) and impregnation/inclusion
(Fiberglas, Spectra/Aramid, carbon strands, metal inserts
and so on) are dramatically different from 1973:
https://aviationbenefits.org/case-st...87-dreamliner/
and even:
https://www.youtube.com/watch?v=DoPVe7MiY1w
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971