[python] Re: Pushable requirement and different turing left and right
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sun, 20 Mar 2011 09:24:12 -0700 (PDT)
Hi Gerald,
There should be some contribution from the two factors you pointed out, because
the modules were made independently, and mostly eye-balled. However, my left
hand also can control handlebars better than right, and now the whole body on
the python, so I have some suspicion that the brain has something to do with
it,
good or bad. I will keep this on a watch with newer bikes...
Vi
________________________________
From: Gerald Kuettner <bepb@xxxxxx>
To: python@xxxxxxxxxxxxx
Sent: Fri, March 18, 2011 7:18:12 AM
Subject: [python] Pushable requirement and different turing left and right
Hi Vi,
Please let suggest to verify two points?
*Check if front and rear wheel are aliged.
*Check if the pilot is tilted left or right.
Both issues would create quote different turing behavior left and right.
Gerald
-----Ursprüngliche Nachricht-----
Von: Vi Vuong <vi_vuong@xxxxxxxxx>
>An: python@xxxxxxxxxxxxx
>Gesendet: Fr., 18. Mär 2011, 06:33:20 GMT+00:00
>Betreff: [python] Re: Cool handlebar for 48deg 20in
>
>
>Hi Gerald,
>
>
>Some weight on the seat / pivot is reasonable, but the push method seems to be
>more objective than riding, which heavily depended on individual coordination
>/
>experience. My left turn seems to be much smoother than my right turn, brain
>issue?
>
>
>Vi
>
>
>
________________________________
From: Gerald <bepb@xxxxxx>
>To: python@xxxxxxxxxxxxx
>Sent: Thu, March 17, 2011 10:24:07 PM
>Subject: [python] Re: Cool handlebar for 48deg 20in
>
>Hi Vi, Hi Jürgen,
>I am not sure about the pushable requirement. Maybe a python beeing
>pushable
>is an indication that the pivot angle is right, but it seems, just that a
>python is rideable does not ensure it is also pushable.
>I do own two such specimens. Both of them ride quite nice and I do so in
>public traffic.
>
>For a python to be pushable, I think, beside having the pivot angle right
>you need to be able to put sufficient weight on the pivot while pushing.
>If
>the back of the seat is to far back, you may not be able to.
>
>
>Gerald
>
>
>On 17.3.11 5:14 , Vi Vuong wrote:
>Hi Jürgen,
>>
>>
>>OK, we should advertise the pushable requirement, perhaps in the
>>pivot
>>angle page. I tested pushing the bike on concrete surface today,
>>and
>>it's not very easy to maintain a straight line for long.
>>
>>
>>Yes, DirkB's website recently came back online, so I was able to
>>download the program to play with. It must be a newer
>>versionbecause it is now written in C# and compiled for Windows
>>(exe). Luckily, I can compile and run in Linux MonoDevelop. It
>>would be nice to do some dynamics simulation of stable and
>>unstable
>>settings/conditions. Experimental measurements would be good
>>also,
>>say gyroscope and accelerometer (iPhone).
>>
>>
>>Regarding wheel flop, my BB is very close to the hub so the impact
>>of
>>long wheel base seems not as much as pivot angle. I was eager to
>>learn some more today. I can turn left / right with just a touch
>>of
>>my glove on the ground for assurance, and learned to push harder on
>>the pedal to get back in line.
>>
>>
>>Went over road bumps and speed bumps also, so 20in wheel seems OK.
>> Will do off-road test this weekend. Good seat contact seems
>> crucial
>>for controlling the bike, the arms also. Funny how the training
>>wheels now give me less control than free arms, so it can be
>>retired.
>> Maybe there is an invisible handlebar somewhere (quantum?). The
>>gloves however are very useful, not sure when they can come off.
>>
>>
>>Thanks for the advice and safety concerns. In general, I am afraid
>>to
>>be in traffic on any bike, not to mention this one, so I will stick
>>to
>>empty streets, curbs, and trails...
>>
>>
>>Vi
>>
>>
>>
>>
>>
________________________________
From: Jürgen Mages <jmages@xxxxxx>
>>To: python@xxxxxxxxxxxxx
>>Sent: Wed, March 16, 2011 1:49:52 AM
>>Subject: [python] Re: Cool handlebar for 48deg 20in
>>
>>Great!
>>
>>The last seconds of your video shows something essential: If the
>>python is pushable it also is rideable.
>>
>>Also great to see that you have used Dirk Bonnés calculation
>>program, which funnily enough is written in the programming
>>language
>>python:
>>
>>http://en.openbike.org/wiki/File:GuineaPigPivotAngle.png
>>
>>But also keep in mind, that the combination of pivot angle and
>>weight distribution is crucial for rideability. A heavy front
>>part
>>needs bigger pivot angles for wheel flop compensation.
>>
>>And lastly keep in mind that it takes several hundred kilometers
>>of
>>practice to feel save in traffic ;-)
>>
>>Cheers,
>>Jürgen.
>>
>>
>>
>>On 16.03.2011 03:10, Vi Vuong wrote:
>>> Magic, I can ride it on first trial :) Ground clearance also
>>>improved, but seat angle became a little too upright ~40 deg
>>>to
>>>stop me from sliding off forward. I can also push it forward
>>>by
>>>the headrest. Perhaps this is a good objective test for
>>>ride-ability, independent of hip coordination...
>>>http://www.youtube.com/watch?v=6yBjSGL_pd8
>>>
>>> Vi
>>
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