[python] Re: Bipolar update
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Sun, 27 Nov 2011 19:02:12 -0800 (PST)
Hi Gerald,
Yes, the Dirtsurfer has pivot in front of the wheel, positive trail, and
negative pivot angle like the Bipolar's rear wheel.
Vi
>________________________________
> From: Gerald <bepb@xxxxxx>
>To: python@xxxxxxxxxxxxx
>Sent: Sunday, November 27, 2011 2:23 PM
>Subject: [python] Re: Bipolar update
>
>
>
>Hi,
>from the picture on Wikipedia, it does not look like there is a
pivot behind the frontwheel.
>Am I right that the pivot is actually in front of the front wheel?
No negative trail?
>
>BR
>Gerald
>
>
>On 27.11.11 20:26 , Vi Vuong wrote:
>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] 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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>
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