## [python] Re: Jetstream

*From*: Thomas P Jahn <tpj@xxxxxx>
*To*: python@xxxxxxxxxxxxx
*Date*: Wed, 28 Feb 2007 16:01:17 +0100

There is a borderline where the self centering force compensates the
"weight of front part + leg-feet weight (i.e. that what causes wheel
flop)".That is where the balance is.

`I am still confused about the "compensation" or
``balance. What exactly has to be compensated?
`Jürgen writes on his homepage:
"So 63° is the best pivot angle?

`Not really, but it is close: The optimal pivot
``angle is exactly the one where the weight of the
``whole front part (including the riders legs) is
``in equilibrium with the rest of the bike
``(including the rest of the rider). This is
``different with every bike and rider. To be more
``exact: It is the angle where the wheel flop
``effect is nullified by the seat rising effect.
`

`The heavier the rear part is in relation to the
``front, the closer the pivot angle may approach
``the desired maximum seat rising angle. "
`

`So, here it sounds as if the compensation is to
``increase rear weight versus front weight.
``And how would it in theory relate to the pivot
``angle?: The heavier the rear part compared to the
``front, the more shallow the angle may be???
``But you Dirk say something about pivot angle
``versus front weight. And that is probably
``something that cannot be put in numbers. like
``degree angle / kg weight???
`
To increase the confusion:

`In the other thread "81 inseam" you just said
``that you did not experience any difference with
``the luggage. So, weight plays no role??
`

`Then again its sounds as if you on your
``babypython must be close to wheel fleep. But
``still it never happened. That sounds really good.
``And your pivot angle is 60° as I can see from the
``survey. What about the weight (rear versus
``front?) Or does it matter at all in your case???
``It seems not!?
`
cheers
Thomas

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