Sorry the mail I spoke about was to big for the server. Google showed it to me like it was sent. Here are the pictures I spoke about. 2011/11/24 Steffen Risse <big.skangster@xxxxxxxxxxxxxx> > 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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