[python] Re: Python/Hipparion Trike

Jürgen Mages wrote:

> Hi,
>
> after testing a tadpole trike last week, I know what people like
> trikes for. Great handling, still quite fast, you feel safe and
> comfortable even on slippery surfaces like snow. And you can ride
> slow without ballance problems.
>
> I startet to draw a first scetch of a Python-/hipparion-trike with
> 20-inch rearwheels and 16-inch frontwheel. It is qite narrow
> (track = 700mm) to keep the air-resistance small and it is low
> (200mm seat high)to keep cornering safe and fast. With budget and
> reliability in mind I would use sachs drum brakes (modified for
> stub axles) in the rear and sachs 3x7 in the front. Tubing is
> 40x40x1,5 for the main frame and fork-extension, 40x10x1,5 for the
> front fork and 22x1,5 for seat-stays and handlebars. For the
> steering-head-bearing I´d prefer timken-bearings
> (Kegelrollenlager) in a solid size. Front brake will be a standard
> V-brake. Crank is a 48 teeth MTB crank shortened to 150mm (I like
> short cranks). Whith 12-28 gears and sachs 3x7 there is a real
> speed range from 6 km/h up to 40 km/h. Tires will be Schwalbe Big
> Apple for comfort in combination whith a quite low rolling
> resistance. A steering dampener (VW Beetle, very cheap ;-) )
> should cure high-speed instability.
>
> I put a (really bad, sorry!) scan of my first drawing in the
> "Anhang". I think I will shorten the wheelbase from 1050mm to
> 1000mm.
> What do you think about this project? Some Changes needed? Thank
> you for any input!

Hi Christoph,

The rear wheel is positioned very much like a normal python. With so
little weight on the rear wheel (the half of  a normal python), is there
much sense to use brakes at all on the rear? My guess is the rear wheels
will slip the moment you pull the breaks. The hipparion neither comes
with rear breaks.

groetjes,
Dirk

>
> Cheers,
> Christoph
>
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