Having trouble getting my post accepted so have reduced the size of my
attachment. Any comments on the effectiveness of a pivot joint like this?
In particular is it possible to have just 50mm between rod ends? I need to
make the front section fold into the frame of the seat and so want the
pivot joint to be able to rotate on the front bar of the seat. Hope you ca
understand the idea.
On Mon, Jan 1, 2018 at 4:06 PM, FreeLists Mailing List Manager <
ecartis@xxxxxxxxxxxxx> wrote:
python Digest Sun, 31 Dec 2017 Volume: 15 Issue: 019
In This Issue:
[python] Re: python Digest V15 #17
[python] Re: python Digest V15 #17
----------------------------------------------------------------------
From: Howard Stevens <hstevens94@xxxxxxxxx>
Date: Sun, 31 Dec 2017 16:24:15 +1000
Subject: [python] Re: python Digest V15 #17
Hullo Pythonauts,
Happy New Year from Australia. I am making a new light weight travelling
trike and am interested in any comments/advice you can give me.
Because my trikes must fold, the pivot joint is a little in front of the
hip line which creates a bit more PSI I found a pivot joint angle of
around 55 degrees settled this with minimal flop. However if my new joint
is feasible I think I might be able to improve on this. My main concern is
how to make it strong enough and whether the rod end separation of about
50mm will work. Comments please! I posted more detailed drawings but
they must have been too big and my post didn't appear! Hope this one will!
Howard Stevens
On Wed, Dec 6, 2017 at 4:06 PM, FreeLists Mailing List Manager <
ecartis@xxxxxxxxxxxxx> wrote:
python Digest Tue, 05 Dec 2017 Volume: 15 Issue: 017.
In This Issue:
[python] Re: Velomobile development drawings: Part 4
----------------------------------------------------------------------
From: Kenneth Stewart <kenny.stewart@xxxxxxxxxx>
Subject: [python] Re: Velomobile development drawings: Part 4
Date: Tue, 5 Dec 2017 13:15:55 +0000
Hi Darin,
You are right the trike tilts as you turn, it's not designed as tilt
steer it's only a side effect.
The main point of a tilting trike is to try and keep narrow and light
wheels in line with forces.
A few years ago I looked building a motorised tilting trike, and the I
came across a guy in Australia who had built one, got it certified and
registered and couldn't keep it out of the ditches.
The control of steering and tilting together was too much in unplanned
road conditions. I went off the idea shortly afterwards.
Kenny
On 5 Dec 2017, at 05:05, Darin Wick wrote:
If I understand the renderings correctly, it's a tadpole trike where
the crank-seat-rearwheel assembly tilts, and the pivot is set up so
that tilting causes the front axle (sort of a cart axle that runs all
the way across with the wheels fixed to either end) to turn in the
direction of the lean. Or, conversely, the trike has to lean into the
corner as you turn.
I knew someone with a similar trike - a tadpole with the front cross
set up to pivot at an angle so it would lean as it turned. It was,
effectively, a tilt-steer trike. I don't have photos, but you can see
a couple pictures of something very similar here: http://tiltingvehicles
blogspot.com/2010/07/zepher-tilt-steer-tadpole.html
It was simple, elegant, and great fun to ride, but had two major
problems:
1) the ratio of tilt to steer was fixed by the pivot angle, so it only
worked well within a certain range of speeds
2) on crowned roads (or any other uneven surface) the rider had to
keep the seat perpendicular to the surface to go straight, which meant
leaning at an odd angle
He concluded that, if at all possible, you should keep the tilting and
steering mechanisms independent.
-Darin
---- On Mon, 04 Dec 2017 12:19:13 -0800 Kenneth Stewart <
kenny.stewart@xxxxxxxxxx
> wrote ----
Hi Jurgen,
I am aware of tilting trikes with lean steer, but my design does not
work like that.
The front axle is rigid, there is no Ackerman steering, the wheels do
not pivot. The axle pivots at 65 degrees to horizontal at the front of
the body.
The body, chassis, transmission, seat, and rear wheel are one unit
As the front axle is turned the body leans by means of the geometry
into the bend. There are no extra levers to control the lean.
Regards
Ken
On 4 Dec 2017, at 19:45, Jürgen Mages wrote:
Thanks Ken, this makes the steering principle more clearer to me. The
design reminds me of Greg Kolodziejzyk's lean steer trike (see similar
concept in the attached gif).
The steering pivot seems to be behind the rider and the rider plus the
whole front part is one single unit that tilts - correct?
If so I would consider it to be rearwheel steered (RWS) and not python-
ish ;-)
Regards,
Jürgen.
On 04.12.2017 19:40, Kenneth Stewart wrote:
> Hi Jurgen,
>
> I have just published the section concerning Python geometry on my
> website. Please have a look and see if it makes sense.
>
> Regards
>
> Ken Stewart
>
> http://kenstewartartist.com/
>
>
>
<4barslinkage.gif>
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Listmaster: Jurgen Mages jmages@xxxxxx
To unsubscribe send an empty mail to
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------------------------------
End of python Digest V15 #17
****************************
------------------------------
Subject: [python] Re: python Digest V15 #17
From: =?UTF-8?Q?J=c3=bcrgen_Mages?= <jmages@xxxxxx>
Date: Sun, 31 Dec 2017 11:39:35 +0100
Hi Howard - happy new year to you! Unfortunately, here we are still
stuck in 2017 ;-)
It is always a pleasure to hear from your new projects. A more detailled
answer will follow soon ...
If you agree, I will update your Python wiki project page:
http://en.openbike.org/wiki/Python_Trikes#Howard_Stevens_Mk3.2C_Australia
Best regards,
Jürgen.
On 31.12.2017 07:24, Howard Stevens wrote:
Hullo Pythonauts,me.
Happy New Year from Australia. I am making a new light weight
travelling trike and am interested in any comments/advice you can give
Because my trikes must fold, the pivot joint is a little in front of----------
the hip line which creates a bit more PSI I found a pivot joint angle
of around 55 degrees settled this with minimal flop. However if my new
joint is feasible I think I might be able to improve on this. My main
concern is how to make it strong enough and whether the rod end
separation of about 50mm will work. Comments please! I posted more
detailed drawings but they must have been too big and my post didn't
appear! Hope this one will!
Howard Stevens
On Wed, Dec 6, 2017 at 4:06 PM, FreeLists Mailing List Manager
<ecartis@xxxxxxxxxxxxx <mailto:ecartis@xxxxxxxxxxxxx>> wrote:
python Digest Tue, 05 Dec 2017 Volume: 15 Issue: 017
In This Issue:
[python] Re: Velomobile development drawings: Part 4
------------------------------------------------------------
I
From: Kenneth Stewart <kenny.stewart@xxxxxxxxxx
<mailto:kenny.stewart@xxxxxxxxxx>>
Subject: [python] Re: Velomobile development drawings: Part 4
Date: Tue, 5 Dec 2017 13:15:55 +0000
Hi Darin,
You are right the trike tilts as you turn, it's not designed as tilt
steer it's only a side effect.
The main point of a tilting trike is to try and keep narrow and light
wheels in line with forces.
A few years ago I looked building a motorised tilting trike, and the
came across a guy in Australia who had built one, got it certifiedand
registered and couldn't keep it out of the ditches.unplanned
The control of steering and tilting together was too much in
road conditions. I went off the idea shortly afterwards.the
Kenny
On 5 Dec 2017, at 05:05, Darin Wick wrote:
If I understand the renderings correctly, it's a tadpole trike where
the crank-seat-rearwheel assembly tilts, and the pivot is set up so
that tilting causes the front axle (sort of a cart axle that runs all
the way across with the wheels fixed to either end) to turn in the
direction of the lean. Or, conversely, the trike has to lean into
corner as you turn.see
I knew someone with a similar trike - a tadpole with the front cross
set up to pivot at an angle so it would lean as it turned. It was,
effectively, a tilt-steer trike. I don't have photos, but you can
a couple pictures of something very similar here:tilt-steer-tadpole.html
http://tiltingvehicles.blogspot.com/2010/07/zepher-
<http://tiltingvehicles.blogspot.com/2010/07/zepher-tilt-steer-tadpole.html>
only
It was simple, elegant, and great fun to ride, but had two major
problems:
1) the ratio of tilt to steer was fixed by the pivot angle, so it
worked well within a certain range of speedsmeant
2) on crowned roads (or any other uneven surface) the rider had to
keep the seat perpendicular to the surface to go straight, which
leaning at an odd angleand
He concluded that, if at all possible, you should keep the tilting
steering mechanisms independent.of
-Darin
---- On Mon, 04 Dec 2017 12:19:13 -0800 Kenneth Stewart
<kenny.stewart@xxxxxxxxxx <mailto:kenny.stewart@xxxxxxxxxx>
> wrote ----
Hi Jurgen,
I am aware of tilting trikes with lean steer, but my design does not
work like that.
The front axle is rigid, there is no Ackerman steering, the wheels do
not pivot. The axle pivots at 65 degrees to horizontal at the front
the body.similar
The body, chassis, transmission, seat, and rear wheel are one unit
As the front axle is turned the body leans by means of the geometry
into the bend. There are no extra levers to control the lean.
Regards
Ken
On 4 Dec 2017, at 19:45, Jürgen Mages wrote:
Thanks Ken, this makes the steering principle more clearer to me. The
design reminds me of Greg Kolodziejzyk's lean steer trike (see
concept in the attached gif).the
The steering pivot seems to be behind the rider and the rider plus
whole front part is one single unit that tilts - correct?python-
If so I would consider it to be rearwheel steered (RWS) and not
ish ;-)
Regards,
Jürgen.
On 04.12.2017 19:40, Kenneth Stewart wrote:
> Hi Jurgen,
>
> I have just published the section concerning Python geometry on my
> website. Please have a look and see if it makes sense.
>
> Regards
>
> Ken Stewart
>
> http://kenstewartartist.com/
>
>
>
<4barslinkage.gif>
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To unsubscribe send an empty mail to
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End of python Digest V15 #17
****************************
------------------------------
End of python Digest V15 #19
****************************
Attachment:
Proposed pivot joint at front of seat(resized).jpg
Description: JPEG image
