I don't know about your Pythons, but when I was learning to ride
my 2 wheeled Python, I did feel the CoG going to the opposite
side of the corner. Which meant: I turned to the left and I felt
my bike wanting to lean to the right, so I had to lean my body a
bit more to the left to correct this. Once I knew that more
leaning into the corner was needed (compared to my recumbent),
it is not really a matter of leaning the body anymore, but
before you take the corner you let the bike lean a bit more. I
think this is done by opposite steering: steering a very short
time to the right if you want to go to the left (like somebody
mentioned on the list too). That I think, is one of the main
reasons why some people have great difficulty learning to ride a
Python. They have to switch from a more 'leaning the body' way
of steering to a 'turning the opposite direction' way of
steering. Since I was already driving a recumbent with a low
angled seat, I was quite used to the latter and didn't have that
much trouble with a Python. Though, the Python seems more
sensitive to opposite steering for leaning.
Imo, leaning of the body is hardly done when riding a Python.
That way of leaning is more a thing of trikes and upright
bicycles. I carefully checked leaning of my body when I was
riding my recumbent: none that I could notice. But opposite
steering: yes!
Yes, the legs going to the inside of the corner do help I guess,
but adding things in total, I have the expirience with my Python
that the CoG does go to the ouside of the corner. Try it: make a
very tight turn with your Python and let somebody check how much
you lean. Then, take a mountainbike or whatever and make the
same turn with the same speed. I bet you need to lean quite a
bit more riding your Python.
> Subject: [python] Re: AW: Re: Pythonjetrike
> From:
gdurbrid@xxxxxxxxxxxxxx
> To:
python@xxxxxxxxxxxxx
> Date: Fri, 7 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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