Hi Dirk
Last time we discussed muscle memory, I didn't have enough experience but I can
confirm now that it takes less than 5-10 minutes for the PSI to go away when
switching to a different python or not riding within 2 weeks. However I
usually ride between 10-15mph due to traffic, gravel, debris, wind, or limited
gearing so your PSI experience may be different at higher speed. Does it take
much longer?
I need to clarify that it is worth it for one short-term experiment to explore
the range of rideable angles around the sweet spots or just for curiosity. I
also agree that there is no need for pivot angle adjustment long term, unless
the bike is permanently experimental...
Vi
//www.freelists.org/post/python/Revisiting-RWD-recumbents,2
On Apr 16, 2015, at 3:26 AM, Dirk Bonne <dbonne@xxxxxxx> wrote:
Hi Johnny,
Changing pivot angles messes up the muscle memory needed for smooth riding
(this is from personal experience as with every python I make the angle
slightly different). A python bike is very personal in that way.
Beware that for a high pivot angle (e.g. 70degrees), you'll need high seat
angle too, as you'll otherwise have trouble turning at all at slow speed. At
a seat angle of 35degrees I had trouble with 70degrees and was forced to
lower the pivot angle to 60.
My personal favourite is 60degrees.
Gesendet: Donnerstag, 16. April 2015 um 05:33 Uhr
Von: "Vi Vuong" <dmarc-noreply@xxxxxxxxxxxxx>
An: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
Betreff: [python] Re: My Python Concept
Hi Johnny,
If you are not sure yet about pivot angle, I would suggest doing some angle
experiments with your current bike before building the next one. Here is my
experimental bike http://youtu.be/5JUg0zIHSuM
Assuming your current bike also has 1200mm wheelbase, you can vary pivot
angles from 10-15 degrees by changing wheel size. See table below. I find
50+ degrees more bearable than 70+ degrees. The sweet spot is around 60-65,
see http://en.openbike.org/wiki/Python_Projects_Survey
Have fun,
Vi
PS:
Nice touch stamping the word python on the frame.
| rear wheel | front wheel | pivot angle
| 16 | 16 | 60
| 16 | 18 | 58
| 16 | 20 | 55
| 16 | 22 | 53
| 16 | 24 | 50
| 16 | 26 | 48
| 16 | 28 | 46
| 18 | 16 | 62
| 18 | 18 | 60
| 18 | 20 | 58
| 18 | 22 | 55
| 18 | 24 | 53
| 18 | 26 | 50
| 18 | 28 | 48
| 20 | 16 | 65
| 20 | 18 | 62
| 20 | 20 | 60
| 20 | 22 | 58
| 20 | 24 | 55
| 20 | 26 | 53
| 20 | 28 | 50
| 22 | 16 | 67
| 22 | 18 | 65
| 22 | 20 | 62
| 22 | 22 | 60
| 22 | 24 | 58
| 22 | 26 | 55
| 22 | 28 | 53
| 24 | 16 | 70
| 24 | 18 | 67
| 24 | 20 | 65
| 24 | 22 | 62
| 24 | 24 | 60
| 24 | 26 | 58
| 24 | 28 | 55
| 26 | 16 | 72
| 26 | 18 | 70
| 26 | 20 | 67
| 26 | 22 | 65
| 26 | 24 | 62
| 26 | 26 | 60
| 26 | 28 | 58
| 28 | 16 | 74
| 28 | 18 | 72
| 28 | 20 | 70
| 28 | 22 | 67
| 28 | 24 | 65
| 28 | 26 | 62
| 28 | 28 | 60
============================================================ This is the
Python Mailinglist //www.freelists.org/list/python Listmaster: Jurgen
Mages jmages@xxxxxx To unsubscribe send an empty mail to
python-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field.
============================================================
