[python] Re: Front suspension update
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Thu, 24 Nov 2011 23:19:16 -0800 (PST)
Hi Steffen,
Since I have been more occupied with the shock-leg interference than anything
else, I didn't think much of PDI (probably none / little). However, PDI may be
as bad as road disturbance for steering (PSI?). Now that the bike is more
comfortable, I can focus on steering over bumps to see if suspension is worth
it...
Regarding welding, I started out brazing with MAPP gas cans, then moved up to
flux core wire welder. Both methods allow me to work outside at home. The
flux core wire is much stronger, easier, and more forgiving, but I am pushing
it by not doing any surface cleaning at all (just hold my breath while welding
:). When I can access a facility with MIG/TIG, I would like to give stainless
steel a try like Patrick's beautiful work.
Cheers,
Vi
>________________________________
> From: Steffen Risse <big.skangster@xxxxxxxxxxxxxx>
>To: python@xxxxxxxxxxxxx
>Sent: Thursday, November 24, 2011 1:39 PM
>Subject: [python] Re: Front suspension update
>
>
>Hey Vi,
>
>the handle bars may help but it's still a big lever on a small point. But
>never mind. Dirk is right with his answer and also showed another good option.
>But I didn't found a nice way to bring the flevo design in the low profile
>python frame. With my 3 sketches I wanted to show the influence of damping on
>the bottom bracket and the other way round while pedaling (pdi = pedal damping
>influence). I had no time to write all my comments earlier as I made the
>sketch at work.
>
>Laszlos design is a simple solution, but has a big and very noticeable pdi.
>
>In the flevo design the bb rises up and moves down together with the seat
>(just like the normal python) and brings a suspension on top. But still there
>is the possibility of a noticeable pdi if the chain forces the suspension to
>move up when the center point isn't in line with the chain (like the first
>single pivot mountain bikes).
>
>If you use your design with 2 pivots (one on top and one at the wheel axle)
>like I drawed then the system gets much stiffer and stable. The movement of
>the bb depends on the dimensions of the links (it may can move up or down or
>stay still) and so also the pdi depends on this levers.
>
>The third design I drawed is a typical parallel linkage and I think it's a
>nice option for a python like design to have high stiffness, small pdi and a
>high weight saving potential. the pdi again depends a lot on the dimensions of
>the links. The frame may shortens a bit while damping. Had no time to try it
>yet as I'm allready working hard on a folding python trike. (Maybe I shoult
>integrate it?)
>
>regards,
>steffen
>
>
>
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