[python] Re: px5 stability


Le 29-mars-05, à 19:02, Dirk Bonne a écrit :



Olaf Johansson wrote:

The impact from pedalling upon steering has been no problem for me on my flevo bike.

Entirely agreed! Its a technique thing.
Yes, but not only. I think there is 2 iportent mesures influe on the pedaling impact on steering:
- the angle between the pivo and forces of the legs; more sharp, better it is , it's flevo solution
-the position of the pivo : more far off BB better it is ; it's python solution
- TT bike or my bikes have a part of each of these solutions... well ... flevo too, but it's too much and at high speed i think steering is havy , too reactive

Laurent



In the beginning I could see that the bicycle was slightly shaking its head over my pedalling.

But after a while the legs (somehow) learned to compensate pedalling disturbances. This I experienced both on the flevo, and now on the python.

Dirk

On Mar 29, 2005, at 18:04, ebooth@xxxxxxxx wrote:

What if, instead of rigidly fixing the seat bottom to the front steering
assembly, one attached it to the rear assembly on a swivelling mount, with the
seat back separately and firmly connected to that aft part of the frame? Perhaps
this would accomplish what Frank has in mind.

Eric

Quoting Olaf Johansson <noll@xxxxxxxxx>:


In the original set up with the seat attached to rear part you use a
mixture of leaning the legs and swivelling the hip in order to steer.
If you sit on the front part of the frame – the part that is to be
steered – it will be impossible to manoeuvre the bike unless your
shoulders were tightly strapped to the back rest. Even then steering
would be a real stunt ;o)

Olaf



On Mar 28, 2005, at 21:18, Frank Parmir wrote:

Hi Jurgen, I've been reading the list for several monts. A while back
you reported the px2 was not as stable at high speeds as the p1 and
p3. Is the px5, which has the pivot moved to the rear any more or less
stable? I hope to begin building the first python in Columbus, Ohio
(USA) very soon and am anxious to hear. Also, I am thinking of
attaching the butt bucket part of the seat to the front half to
eliminate pedaling perturbance. I will still attach the back support
with arm rests for shifters and brakes to the back half. That means
steering by swiveling the hips, not just the legs. Do you have any
predictions about how sucessful that might be.
Also, I'm a little woried. You haven't posted since your speed record.
Are you OK? 


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