Hi all It would seem that now is the time to post the python I built a couple of years back. I named it pythonui as I live in NZ and the New Zealand indigenous language is Maori and the word for big or large is nui. It went through a number of versions, the first three had 'normal' back ends of different lengths. It was built around Jurgen's instructions on python-lowracer.de The first was built tough to withstand being crashed every thirty seconds, and they got more refined until this final version. I used 12mm tie rod ends for the pivot, and while I started with a 65 degree pivot, I altered it in this version to 63.5 degrees to increase the centering effect of the pendulum. The figures: wheelbase: 2040mm, total length: 3000mm, trail: -260mm, BB height: 490mm, seat height: 380mm, ground clearance: 170mm, weight: 25Kg (yes it is heavy!), rear tray: 800x400mm. Being so long, it turns like a supertanker, taking a full road width to turn around. Having the trailer on the back allowed me to carry 2 children, it makes it really heavy, but they sure love it! They learned *very* quickly that if they wobbled me it would come close to a crash! So they sat still and enjoyed it. I would recommend that you have the child seated lower than I did as it will affect the handling less. The benefit of the trailer on the back is that it had the tendency to stretch the python, making it more stable. Having said that it prefer riding it without the trailer as that adds a lot of weight. The length reduced the natural twitchyness of the python a lot. When I made it I just made a whole new back end and bolted my existing front end on. On Sun, Jan 5, 2014 at 9:21 AM, Vi Vuong <vi_vuong@xxxxxxxxx> wrote: > Happy New Year, All, > > > http://en.openbike.org/wiki/Python_Projects_Survey > has a little more data (see attached plot) > Popular wheelbase is around 115cm. Cargo bike starts around 160cm with > the Pythoon > > This bouncy futon bike had wheelbase longer than 240cm > https://www.youtube.com/watch?v=8VQlk09qdDU > Unanticipated sudden cargo movement can affect steering adversely, at > 2:00, but recovery is quite feasible at medium/low speed. A forward-facing > passenger can actually help steer / stabilize the bike as backseat driver > :) In current form as a leaning trike, wheelbase is only 140cm, long > enough for a passenger or quite a bit of cargo, gaining 25cm width, > https://www.youtube.com/watch?v=rxlT1XSvWoU > > Handling is more like a wagon / minivan (long & low :) not too bad when > empty, but more attention should be paid to the precious cargo regardless > of the vehicle... Carrying a small child / pet in front like Dirk > demonstrated seems like a safer solution > https://www.youtube.com/watch?v=pMyq4LnJBic, otherwise like commercial > bikes/trikes, a box with seat & belt should be a safe bet. > > Cheers, > > Vi > > > > > ------------------------------ > *From:* bepb <bepb@xxxxxx> > *To:* python@xxxxxxxxxxxxx > *Sent:* Saturday, January 4, 2014 10:05 AM > *Subject:* [python] Re: Long wheelbase and handling > > Hi Erik, > pytons with wheelbases with around or more than 1,5m are not unusual. > http://www.python-lowracer.de/projects.html shows a table with the > measurements of some pythons. > > Better make sure you daugher can't get any limps into moving parts! > > Best regards > Gerald > > > > > Am 04.01.2014 15:37, schrieb Erik Wassermann: > > Hi everyone! I'm currently thinking to build a new rear part for my > python with extra long wheelbase to have a big storage compartment and\or > an additional seat for my daughter. > > I was inspired by "pythoon" from the project list. Searching the archive > for a final statement if that configuration was ridable in everyday > commuting was futile. > The only hint I found was that the "pythoon" was handling like a truck. > > Thus my question, if anyone has any experience with extra long pythons > (above 1,5m wheelbase). > > My python has 2x26 wheels with Schwalbe Baloon tires (559x60). > > Thanks, > Erik > > > > >
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