[python] Re: New Drawing: Drive system
- From: "Paul Bell" <paulb@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 18 Jun 2004 11:37:34 -0400 (EDT)
Hi all and Scott,
<snip>
Paul,
Are you familiar with the highwheel bikes of the 1800's? There were a few
bikes with this design back then. The main drawback, from what I've read,
is the chain tension, and shifting. I assume you would be using a fixed
gear ratio, unable to shift? Have you thought about an internally geared
hub? I too, am short and have a craze for the python design. I would
love to see something like this work. I had been doing drawings like
your's for awhile before I settled on a smaller front wheel.
Scott
<end snip>
I would still have gears with conventional triple crank (or double if
width is an issue).
There would be a fixed gear from the small cogs on each pedal crank going
forward to a fixed cog on the front triple(double) crank . That front
crank would then drive the rear wheels.
I hope this makes sense !
Also was thinking of adding electric assist hub motor. I think it would
have to be on the front wheel as if it was on the rear wheel I think the
bike would tend to "fold" as power was applied to the rear wheel.
Any comments on this.
I will keep all posted as the project develops. No production planned
until end of July tho as I stated. If I build I will make sure to take
detailed construction photos :)
Cheers to all,
Paul Bell
-----Original Message-----
From: python-bounce@xxxxxxxxxxxxx [mailto:python-bounce@xxxxxxxxxxxxx] On
Behalf Of Paul Bell
Sent: Friday, June 18, 2004 7:47 AM
To: python@xxxxxxxxxxxxx
Subject: [python] New Drawing: Drive system
Hi all,
and welcome to Ralf.
I am pretty busy until after my wedding day on July 10th. I have been
working on a design until I can start building in at the end of July.
One of my problems is my short 5'4" frame and legs. I have been trying to
figure out how I can fit 26 inch wheels(559's I think in metric)
I drew up a design for the pedal system which has half a crank on each
beam of the front frame, ahead of the front axle. I'll not try explain
further but give you the link to my drawing. The drawing is not to any
real scale as I just use Illustrator to do the sketch, and not a CAD
program.
http://www3.sympatico.ca/jebelisle/pythonpedals.gif
Any comments on this design concept???
I think this might help stability as power transmission from the legs will
be closer to the front wheel axle, but its just a guess.
Cheers,
Paul Bell
p.s. Have one other drawing on my basic web page...
http://www3.sympatico.ca/jebelisle/
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