OK. Now I want one!
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________________________________
From: python-bounce@xxxxxxxxxxxxx <python-bounce@xxxxxxxxxxxxx> on behalf of
drcorle <dmarc-noreply@xxxxxxxxxxxxx>
Sent: Sunday, August 26, 2018 5:49:34 PM
To: python@xxxxxxxxxxxxx
Subject: [python] Re: Would my design work?
The front wheel drive you are dreaming of does exist!
It’s inventor is in Norway and the name of the bike is the KerVelo. Invented’s
name is Marc Le Borgne.
Hope this helped.
—. Daryl
Sent from my iPhone
On Aug 26, 2018, at 10:03 AM, chris williams
<chriswilliams67@xxxxxxxxx<mailto:chriswilliams67@xxxxxxxxx>> wrote:
I've often thought that if a powered steering system could be developed for
bikes that could open a few design possibilities. Perhaps like this one.
Chris Williams
Toronto, Ontario, Canada
On Sun, Aug 26, 2018, 11:47 AM Karl McCracken
<karl.mccracken@xxxxxxxxxxx<mailto:karl.mccracken@xxxxxxxxxxx>> wrote:
Hi -
I'm not sure this would work.
The main problem is that hub gear - I don't know of one that'll work with
cranks like that instead of a single drive sprocket. So you've no way to get
power from your left leg and into the hub.:0/
The next issue is the steering torque required. With the "standard" Python
layout, your legs have a nice long lever to act on, and crucially this is well
beyond the wheel's contact point. Your setup doesn't have this, and I'm not
convinced that the handlebars will help.
It is an intriguing design though, so don't give up on it yet!
Karl.
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________________________________
From: python-bounce@xxxxxxxxxxxxx<mailto:python-bounce@xxxxxxxxxxxxx>
<python-bounce@xxxxxxxxxxxxx<mailto:python-bounce@xxxxxxxxxxxxx>> on behalf of
Vincent Bashandy
<vincent.bashandy@xxxxxxxxxxx<mailto:vincent.bashandy@xxxxxxxxxxx>>
Sent: Sunday, August 26, 2018 3:32:20 PM
To: python@xxxxxxxxxxxxx<mailto:python@xxxxxxxxxxxxx>
Subject: [python] Would my design work?
Dear everyone and Jürgen,
Lately I got an idea in my head for a recumbent bike but I stumbled over some
problems regarding the steering system. Then I came across the website about
the Python Lowracer which convinced me that a bicycle with a steering pivot far
behind the center of the wheel was actually possible, so I began modelling my
idea. Now the first version is finished and I consider building it, but first I
need to know if this design would be stable/ridable. Is it worth building it?
The design is different in all other python’s in that it has pedals directly on
the front wheel, using a hub gear to get gear ratio’s. I also added a steer for
stability aiding purposes and as a place to put your hands on. This version is
intended as a racer, as you can see in the first image
The dimensions can be seen in the second image.
The front wheel 28 inch, the rear wheel 20 inch. Crank length is 150mm, seat
angle is 20 degrees.
Now, the main question is, would this work?
My main concern is that the legs could strike the steering column when you have
to steer hard, but there are solutions to this. Also according to the Open Bike
wiki, the Pedal-Steer interference would be bad because the steering pivot is
not under the hip of the driver. This could be solved by moving the pivot to
the seat - and this would also solve the steering column striking problem – but
this would give a trail more than twice as big as it already is now. This would
make it completely unridable, right?
I would like to hear your opinion on this :D.
Greets,
Vincent Bashandy, Netherlands
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