[python] Re: PSI
- From: Gerald <bepb@xxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Tue, 17 Aug 2010 22:59:07 +0200
Hi Jürgen,
so this is the reason why I always have the problem that my python gets
unstable when I stop pedaling, specially at "high" speeds - I loose the
stabilising force from the front-wheel proposition?
But in this case, I think it should get even more unstable when using
the break. Which it does not, it is getting stable again, at least with
my python using a coaster break. (At least up to the point where the
front wheel slips on the road and the ride gets very unstable :-(.
Maybe if you put a lot of power to the pedals, you need to consider the
base bracket as the actual pivot of the frontweel? With your legs
becoming a part of the geometry of the bike? Giving the front wheel a
considerable positive trail?
If you press hard on the pedals, would you not take a significant part
of the load from the pivot and lose the better part of the
self-rightening effect? Should the Python not get unstable? But it does not!
Maybe I still need to learn a lot to understand the physics of riding
the python. On the other hand, in the past, whenever I tried to think
how riding the python should work it went terrible wrong. Maybe thinking
is not the key to python riding.
By the way, I have about 300km on my python now. Max. Speed is
GPS-measured 44,8 km/h now. Could have gone faster, just did not dare.
Best Regards
Gerald
Jürgen Mages wrote:
No problems with that. Clipless pedals are always a good choice on
MBB-recumbents. The two forces that counteract negative trail are the
front-wheel propulsion (no matter if pushing or pulling the pedals)
and gravity.
I use to ride normal pedals for cruising and relaxing, but prefer
clipless if more performance is needed.
On 17.08.2010 11:27, Matthias P. Nowak wrote:
Mike Channon wrote:
Howard
What about having the cranks arranged so that both feet push at the
same time?
There should be no PSI but of course power delivery would be not as
smooth.
Clipless pedals would allow for some pulling as well as pushing.
Hei,
I'm a bit skeptical on that solution. My understanding is that the
pedal force is required to
keep the python stable (counteracting negative trail). Under this
assumption, every time you pull
your legs you will have a very unstable bike. I think the python need
some pedal force all the time.
med vennlig hilsen Matthias
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