On 24.11.2011 05:17, Vi Vuong wrote:
Thanks
Steffen and Patrick for concerns and ideas. I have
added two tubes (handle bars) as Patrick suggested,
which also strengthens the shock joint. I promise not
to do any jumping unless in controlled testing (safe).
The original goal is to see how much front
suspension can reduce road disturbance to steering,
which perhaps can compensate for smaller wheels /
tires...
Steffen's
idea is similar to this full suspension python built in
2008,
Hi Vi
The rotationpoint should be located either ininfinit (which is the
case in your solution) or in the line of force (somewhat above the
line made by seat -> front BB ). The solution of László does not do that. I
would expect it to hop when pedalling.
Another simple solution is the solution of "flevobike":
http://flevofanclub.ligfiets.net/ch1/bike.jpg
http://flevofanclub.ligfiets.net/ch1/ptttrike.jpg
Dirk
I saw
before building mine. This design seems stronger /
lighter / more compact. Any thoughts?
Vi
From:
Steffen Risse
<big.skangster@xxxxxxxxxxxxxx>
To:
python@xxxxxxxxxxxxx
Sent:
Wednesday, November 23, 2011 7:43 AM
Subject:
[python] Re: Front suspension update
Hello Vi,
the idea is nice and brings some ideas for me
too, but Patrick is absolute right when he says
that the system doesn't looks very stable. I'm
working with welding every day, and when I saw
the point where the frame broke, I didn't
wondered about the crack. The frame is relative
slim at that point and your weld seems are for
sure no beauties. I like all your projects, as
they include so many clever ideas, and I don't
wanna hear something like "his frame broke in
heavy traffic and ...". So there are to ways. 1:
built the frame geometries that they meet the
load conditions better (long lever = high
profile) 2. get better knowledge of welding and
clean the parts better before welding (no chrom,
no paint). Sorry for the harangue but some
of that what I saw scares me.
Here 2 ideas from me to your suspension project.
Maybe they are better (maybe not)
regards,
Steffen
From: Patrick
van Gompel
<patrick_van_gompel@xxxxxxxxxxx>
To: python@xxxxxxxxxxxxx
Sent: Wednesday,
November 23, 2011 5:24 AM
Subject: [python]
Re: Front suspension update
Hey
Vi,
Front wheel suspension: wow, nice build.
Except for the 'front part - pivot'
attachment the 'suspension fork to frame
tube' seems a little weak too. Why not weld
two extra tubes left and right of the front
wheel to make a triangle (as in the attached
picture). Just an idea to make your ride
safer...
Happy cycling,
Patrick
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