[python] Re: New Speed Record
- From: Patrick van Gompel <patrick_van_gompel@xxxxxxxxxxx>
- To: <python@xxxxxxxxxxxxx>
- Date: Mon, 15 Aug 2011 12:01:46 +0200
Hello Vi,
I've been tinking about making a shell too, for a trike though.
Just checked your nice CAD shape and have a few things you might want to think
about:
-The shell is very narrow. If the Python turns for a corner it will become
quite a bit wider. Your feet/legs/pedals will come in contact with the shell
first. What maximum turning radius are you aiming for?
-What are the connection points of the shell to the bike? For a 'normal' Python
I figured the back side would be best, but since you have a double bending
Python the middle seems more obvious. Not sure how much room your rear wheel
needs when turning.
-Crosswind seems to be nasty on two-wheeled recumbents with a shell. For a
Python it's probably worse, since side forces affect steering directly (push
the bike sideways in the middle and it will turn towards you). Another thing is
that the sizes of the contact areas in front and behind the steering point(s)
will effect steering (like a windvane).
-What material for the shell are you planning to use? As an alternative to
fibreglass, this site might be usefull:
http://www.recumbents.com/mars/pages/proj/tetz/OFS/projtetzOFS.html Not sure
whether you are able to find recycled foam, but you can always ask companies
for leftovers. ;-)
Happy building and I hope you keep us updated with your inspiring ideas,
Patrick
Date: Sun, 14 Aug 2011 23:11:15 -0700
From: vi_vuong@xxxxxxxxx
Subject: [python] Re: New Speed Record
To: python@xxxxxxxxxxxxx
Hi Jürgen,
Can you ask Matthias from Kahla for some specs /
measurements, that are track specific, such as 650c/700c rims and gearing? Is
pacemake a veloshell, electric-assist motor, or some sort of go-fast device?
The word "fear" appears in Google translation a few times, so mental training
must be key to going fast.
I read somewhere that there is a cadence limit beyond which our mind cannot
keep up with the feet (pedal/steering interference), which can vary from person
to person. However, it seems that python is capable of going fast enough with
training, where drag becomes a limitation (20mph, 30km/h), and that a
velomobile shell may help. Here is my CAD work so far, but not sure how to
make it
out of recycled materials yet, but I am planning to use sticks or outrigger to
start / stop. http://www.youtube.com/watch?v=zvfVLi8m9po. A water / amphibian
version is coming...
Vi
From: Jürgen Mages <jmages@xxxxxx>
To: Python Mailinglist <python@xxxxxxxxxxxxx>
Sent: Sunday, August 14, 2011 1:41 PM
Subject: [python] New Speed Record
For those who understand German: There is an interesting thread going on
the german recumbent forum:
http://www.velomobilforum.de/forum/showthread.php?28186-Python-Lowracer
Matthias from Kahla states that he reached with his python 95 km/h
(about 60 mph) on a racing track with pacemaker. He also manages FAST downhills
by keeping pedaling while slightly rear braking.
Sadly there is no picture of his
bike.
Cheers,
Jürgen.
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