Thanks Jürgen,
With the current BMX gearing, I could go 10-12mph on the flat trails,
and just a little faster down hill with the old seat mounted to the
pivot, and could not feel any shimmy through my back. Perhaps with
the new handlebar, I can feel it through my hand. However, I am
hoping that having -60deg pivot ~ max seat rise and being close to
COG, the beautiful pendulum effect would dampen out any shimmy. Can't
promise any high speed testing though, until having a better set up
(faster/safer bike, crash gear, track,...)
In the mean time, the Dirtsurfer with similar wheel setup seem to do
OK at higher speed,
"The board is unique in that it incorporates a patented steering
geometry [2] <http://www.google.com/patents?vid=USPAT6398237> where
the front wheel pivots from a point in front of and below the axle of
the wheel, via the 'Swingarm'. The rider's weight automatically
centres and straightens the front wheel, creating stability and
control. Another feature of the Dirtsurfer which is not found on other
four-wheeled boards is that, much like a bicycle, the stability
actually increases with speed, thanks to the gyroscopic action of the
large wheels." http://en.wikipedia.org/wiki/Dirtsurfing
Looks like the pivot rise design is patented,
http://www.google.com/patents?vid=USPAT6398237
Vi
*From:* Jürgen Mages <jmages@xxxxxx>
*To:* python@xxxxxxxxxxxxx
*Sent:* Sunday, November 27, 2011 12:10 AM
*Subject:* [python] Re: Bipolar update
Simply amazing! The only thing I am wondering is if the rear part
is doing a shimmy when going fast?
Jürgen.
PS: Looking for a good side view picture of your bipoar for my
project page.
On 27.11.2011 05:56, Vi Vuong wrote:
> Hi Jürgen,
>
>
> Here is a bonus for you, RWS. Turning radius can be reduced quite a
> bit with more rear steering input, while the legs are still in
> command (subconscious?). http://www.youtube.com/watch?v=IZ0KiW1t0m8
>
>
> For your build, I would suggest starting out with a suitcase and
> build the bike to fit inside. Best of luck, especially with
> alignment...
>
> Vi
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