I'll chime in..
I tried handlebars in a "normal" recumbent position (over the knees)
and found the bars completely impossible to use. I welded low bars just in front of the pivot
and was able to ride in ~15 minutes. Not only does the rider have to overcome the self centering effect, but also the leg steer; if he uses legs at all you can't use hands to steer easily. Until I learned I always had to consciously choose leg or hand steer - the muscles of the torso need to pull on opposite sides. Trying to do both puts the muscls' control in contention.
At 04:29 AM 3/22/2010, you wrote:
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Straight riding should be no problem ---Jürgen Maier already made such
a bike with rowing input (both using arms and legs).
But the trouble is that turning corners at lower speed requires a lot of
force input to overcome the self centering effect. This is easy using
legs (good leverage), but the force required to turn using arms only,
combined with the small leverage of handlebars is just too high. I have
handlebars on my python and they are only as an aid - for the fine
points as it were - the main steering force comes from the legs.
Like answered in other postings, I too would go for a modified rowing
bike.Your brother would be able to use his torso as an aid in riding .
The advantage would be two-fold: he'd be faster as the really strong
muscles are found in the torso, and he get good excercise in abdomen and
back (<- why I'd like a rowing bike for myself ;-) ).
On 3/20/2010 8:52 AM, Peter Davis wrote:
> I have a brother who is has limited use of his legs, So why am i
> posting? I am bouncing around the idea of building a hand cranked
> version of the python. as there is no need to steer per se. the crank
> arm could be used as a kind of a tiller. as i have not as of yet built
> or even riden a python I am tossing out the idea to you all in an
> attempt to gauge the feasibility. first off i was thinking
> synchronized cranks so as to avoid "wobble" while pedaling, more of a
> rowing motion than a pedaling. anyways what do you all think? is it do
> able? will it be ride able?
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