[python] Re: AW: Re: Pythonjetrike
- From: George Durbridge <gdurbrid@xxxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 07 Oct 2011 03:33:06 +1100
The Hipparion site would have been a great loss, even if not much
happens there any more. Fortunately, it has just moved to a new URL
(most of it, anyway; not sure if all the English part of it is still
there). http://www.saunalahti.fi/~dvinci/fill.html
Only your feet and lower legs follow the front wheel the full distance:
your upper legs, which have most of the weight, hardly move sideways at
all. On a tadpole, your legs may point outwards, but that's not the
point: their weight doesn't move sideways relative to the ground contact
points.
You can lean into the turn, and leaning through 30 degrees makes a
surprisingly large difference to the stability of the trike, though I've
only experienced it on, and done the calculations for, a tadpole. But my
habit is only to lean hard when I know that I will be generating fairly
large cornering forces, and I don't think I would be doing that while
riding carefully over snow: you don't know when you are going to lose
it.
On Thu, 2011-10-06 at 21:57 +1000, Henry Thomas wrote:
> Gerald,
>
>
> I think these are all very good points. Esko Meriluoto described his
> Hipparion as a front wheel drive lean-steer trike, for the very
> reasons you point out. While the back was static, the considerable
> weight of the riders legs leaned as the trike steered. He has a
> different approach to trail than the Python though. I would have
> provided a link, but sadly his website appears to have been taken
> offline.
>
>
> -h
>
> Henry Thomas
>
>
> On 06/10/2011, at 7:55 PM, Gerald wrote:
>
> > Hi George,
> > considering the stability off a Python I think we also need to
> > consider two additional factors:
> > On a python trike the divers legs move together with the frontwheel.
> > This will counteract the CoG's movement to the outside off the
> > triangle off the wheels.
> > On a tadpole as well as on a short wheelbase delta, the drivers legs
> > point outside, which is a lot worse than on the python.
> > I think the divers legs will make up at least 30% off his total
> > weight.
> >
> > Also the frontwheel will tillt into the corner because off the pivot
> > angle.
> >
> > My trike is quite a bit more agile than the two wheel configuration
> > but even with the slim track (85cm) it is very hard even to lift a
> > rear wheel.
> >
> > Buy the way, you would still be able to lean your upper body to the
> > inside off the corner.
> >
> >
> > Gerald
> >
> >
> >
> >
> > -----Ursprüngliche Nachricht-----
> >
>
>
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