Genius! It's inventions like this that make me think we're not just on
the fringes of the cycling world, but on the cusp of bigger things to
come :-)
On Wed, May 22, 2013 at 7:21 AM, Tihamer Juhasz <balamber@xxxxxxxxx
<mailto:balamber@xxxxxxxxx>> wrote:
Hi Gerald,
Thank you for the reply and the information.
I spent some more time with my Python and this is what it turned
into:
http://myrecumbent.blogspot.ro/2013/05/python-turned-peregrine.html
Regards, Tiha
On Tue, May 21, 2013 at 1:58 PM, Gerald <bepb@xxxxxx
<mailto:bepb@xxxxxx>> wrote:
Hi Tiha,
my congratulations to you new python, nice work.
I ride both, a python with 405 (20") wheels and one with 622
(28") wheels.
Both ride nice but also quite differently.
Beside the obvious better maneuverability due to the shorter
wheelbase, the 20" wheel passes more or less under by legs
while cornering. This makes it even more easy to take tight
corners.
With my 28" Python, the front wheel is actually between my
legs, and together with the seat, this limits the
maneuverability significantly. But for speed on flat, open
roads, the 28" python is the fastest (human powered) bike I
have ridden yet.
When you pick a big wheel, you should consider the required in
seam length of you legs!
Check http://en.openbike.org/wiki/Wheel_Sizes.
Actually, for a first python you made a clever choice :-).
As for moving the pivot behind the seat - one point certainly
is if the seat is mounted to the rear or the front part. If
the seat is mounted to the front part, the overall steering
will change dramatically because you can't steer with you legs
anymore. Don't know if you could consider it a python at all.
Best regards
Gerald
On 13.5.13 17:56 , Tihamer Juhasz wrote:
Thanks Philip. I made up a drawing for the front section, the
wheel cage, in a 3D design sw to calculate the distances and
the bend angles. Otherwise there was no precise plan before
starting to build it. Just made some calculations on paper
and did the rest of design on the fly while building it. The
basic idea to run everything horizontal as much as possible
was made prior to drawing or fabrication. Just two wheels and
a straight line inbetween. Turned out really simple indeed.
Tiha
On Mon, May 13, 2013 at 5:14 PM, Philip Hahn
<everphilski@xxxxxxxxx <mailto:everphilski@xxxxxxxxx>> wrote:
Tiha,
I love how clean your bike looks. Did you make up
drawing prior to fabrication or did you go by trial and
error?
Beautiful Python!
philip
On Mon, May 13, 2013 at 6:42 AM, Tihamer Juhasz
<balamber@xxxxxxxxx <mailto:balamber@xxxxxxxxx>> wrote:
Hi all,
Made some more decent pictures and shared them in a
Picasa album again:
https://plus.google.com/photos/115292543199069523585/albums/5877419428757741505?authkey=CK7Kp9yb07HK4QE
I hope the pictures explain how the pivot works. It
actually works well, but it seems not strong enough
to last long. Will see.
I presently ride the bike like an agitated orchestra
conductor, waving around randomly with my arms, but
its a lot of fun. Its really refreshing to learn
something this basic at this age. I make steady
progress each time I take out the bike, so its
reassuring too. Any tips on riding are welcome. I did
not mount a handlebar yet, so I learn hands free.
A few questions: how much does the trail and wheel
size influence the riding behaviour of the bike? Are
bigger wheels better for riding stability? Has
anybody tried to have the pivot behind the seat? I
would imagine that pedal induced steering would be
even less if the pivot was right behind the seat
support point, so almost at the center of gravity and
behind the rider hip joints. And one more: how about
having a reversed python? That is, move the pivot
back to the hind wheel and have it mirrored (at 115
degr (180-65) or having it at 65 degr. This would be
a rear steered bike I know, but there are a few which
work.
Thanks,
Tiha
