[python] Re: Twist (Was: Re: airbike - programm results)

Hello list,
> Hello Hanno,
>
> welcome to the list.
>
> For those who do not know him: Hanno Hirsch has designed
> a 2x16" flevo style folding recumbent called "Twist".
>
> The Twist won last years foldable bike contest at the
> recumbent fair in Germersheim, as far as I know.
> Congratulation!

> Approx. data, taken from the picture:
>
> Pivot angle: 47 deg
> Trail: -10 cm
> Seat height: 40 cm
> Wheelbase: 97 cm
> Clearance: 19 cm

Seat hight is actually much lower, assuming 30 cm,

have no measurements taken so far.


> Although the Twist is flevobike like design, it has a negative
> trail.

I tried to copy the Flevobike geometry.

> Also notice the 3-gear hub with coaster brake.

and it is the only brake, therefore I could omit the handlebar.

like this, it saves weight and it is much easier to fold.

> @Hanno: Any bad experiences with the negative trail so far?

no, due to poor gearing it is hard to go over 40 km/h, on descents no
problems with stability so far.


> Was it by chance that you build the Twist with NT or did
> you intend a certain purpose with it?

it was an accident, i treid to copy the Flevo geometry and this was the
outcome. But it rides better and more stable as the original Flevo, much
lower speeds are possible, maybe because of the low seat height.

I am working now on the Twist Mk II, even more leightweight (Twist Mk I:
11kg) and better foldable.

the original center pivot measures around 1 kg alone, I try to replace it
with Iglidur (R) bushings.

    Hanno

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