[python] Re: FWD tadpole for velomobile

  • From: Gerald <bepb@xxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Wed, 24 Aug 2011 21:16:22 +0200

Hi Vi,
Very unusual, the for a four wheel configuration. But I think if the tadpod would stand on an uneven surface, you might face hanging in the air with the driven wheel.
For the three wheel configuration, I think, the issue is a suitable drivetrain. Thats why I dug out the Russian trike. If nothing else, the hubs of the frontwheels are about what you need.
But maybe a trike configuration python with a two part shell fairing would also be an option. 
Two part in a way that allows the fairing to bend with the trike.

Gerald







On 24.8.11 16:33 , Vi Vuong wrote:

Hi Dirk & Gerald
Here is a blend of several ideas from suggestions. It's a cross between a quad / outrigger / shopping cart / solar panel, and a pivot overload... http://www.youtube.com/watch?v=IK9ynAhUFUc 

Vi


    Hi Vi,
    a simple solution would probably be a non tilting, rigid front
    part with a central drive unit powering an axle that is connected
    to the drive wheels on either side. Since you cannot fall over
    that easily, you could probably lower the pivot angle to get more
    lean-steer effect (and seat rise for that matter) only on the back
    part on which you are seated. So the majority of the total mass
    would shift during a turn.
    Another idea i had some time ago was to have a similar setup, but
    not with a stiff axle through the center of the front wheel, but a
    stiff axle in front of those driven wheels. This axle would also
    act as a rotation center for a suspended front wheel on either
    side (putting a normal bikes rear wheel drive chain to that axle
    on either side). A "steeringhandle" would then be used to solely
    adjust the lean factor, but not the steering which is still
    controlled by your feet.
    I planned to have similar sprokets on the wheelaxle and the
    driving axle in front, to create not lag during suspension.
    Also, i wanted to use stiff ropes from paragliders connected to
    both front wheel centers and "hang" the frame onto them while
    connecting them with the lean-steer-handles. Leansteering would
    then pull the frame up on one side of the frame, while lowering it
    on the other...
    greetings,
    DirkS


    ------------------------------------------------------------------------
    *From:* Gerald <bepb@xxxxxx>
    *To:* python@xxxxxxxxxxxxx
    *Sent:* Sunday, August 21, 2011 8:55 PM
    *Subject:* [python] AW: FWD tadpole for velomobile

    Hi
    I think  there is or maybe was a front wheel driven tadpod from
    Russia, the S-327. On the page
    http://www.trike.ru/en/photos.php are some pictures off an three
    wheel drive tadpod trike, S-3 3x3 which could be an evolvement.
    But both are steered by handelbars.

    Gerald

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