[python] Re: Arm-assist pedalling

  • From: Steffen R <big.skangster@xxxxxxxxx>
  • To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
  • Date: Tue, 14 Jan 2014 09:56:10 +0100

With a geared Hub an extra chainring on the crankset could solve the
problem of needing a tandem crankset. Shouldn't the crankset for the arms
be out of phase automatically, as the hand have to be on it's lowest point,
when the leg is stretched. That's like 90° out of phase.

Cheers


2014/1/12 Vi Vuong <vi_vuong@xxxxxxxxx>

> I also tried moving my arms together in pedalling motion, and got a
> strange feeling that the bike is slowing down and speeding up with the
> upper body motion, like rowing?  The article mentioned that pedalling out
> of phase (180 deg) is most efficient, perhaps on a stationary bike, not
> sure if there is side effect on python...
>
> Vi
>
>
>   ------------------------------
>  *From:* bepb <bepb@xxxxxx>
> *To:* python@xxxxxxxxxxxxx
> *Sent:* Saturday, January 11, 2014 3:22 PM
>
> *Subject:* [python] Re: Arm-assist pedalling
>
> Hi Marek,
> guess I was coming from my python which uses a geared hub. Adding a
> second sprocket should be possible and you could still build like this.
> But you are right, considering a dérailleur configuration, two separate
> chains toward the hub are not possible without losing the gearing.
> The tandem-drive would solve this.
>
> Gerald
>
> Am 11.01.2014 15:36, schrieb bnmm@xxxxxxx:
> > ...so a new tube would be needed, see tandem-drive2.png-
> > Marek
> >
> > On 11.01.2014 15:14, bnmm@xxxxxxx wrote:
> >> Hi Gerald,
> >>
> >>
> >>> Besides the option off pressing on your thighs, obviously you cold
> >>> add an additional crank set for the hands like this:
> >>> Python_with_add_hand_drive
> >> Wouldn't that require two synchronized gears? How about
> >> tandem-drive.png? The additional gear train (green) would be a direct
> >> transmission on the left side, so a tandem drive chain would be needed.
> >>
> >>
> >> Best regards,
> >> Marek
> >>
> >
> > ---
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