[python] Re: Stability Theory

  • From: Dirk Bonne <dirk_bonne@xxxxxxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Wed, 16 Feb 2005 16:47:13 +0100

Hi Jürgen,

May be the stability problems of the P3 at speeds higher then 50km/h, is simply because you are lying more flat, and may be it has nothing to do with CGs, angles, trails or whatever. The bike could "just" have another oscilation frequency, so it begins to shimmer at a lower speed.

Dirk


Jürgen Mages wrote:

Some input for our theory:

http://www.python.tieflieger.net/pics/gallery/Python_P1_side.jpg
http://www.python.tieflieger.net/pics/gallery/Python_P3_side.jpg

CoG P1: 63%
CoG P3: 63%

Measured with the seating position to be seen in the two
pictures. I wonder why CoG is the same, although the
seat angle is quite different.

Note that BB-FWA of P1 is 30 mm shorter than it was, when
I rode it. Had to shorten it for Eveline.

Cheers,
Jürgen.

PS: Just saw that Jukka updated his website
http://kotisivu.mtv3.fi/jviirret/python.htm

Too bad, that I cannot understand a word finnish:

12.2.2004 Rakensin irroitettavat ohjaustangot. Ohjaus muuttui hieman tarkemmaksi, pyörätiellä valittu ajolinja säilyy ja mutkat onnistuu tarkemmin. Painoa on ohjaustankojen ja lokasuojien kanssa kertynyt jo 17kg. Ei olisi kovinkaan vaikea tehdä 2-3kg kevyempää, kestävyyden silti kärsimättä. Ajelua 5km, lumi pölisee ja kastelee vaatteet.


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