[python] Re: python Digest V11 #55
- From: Howard Stevens <hstevens94@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 18 Sep 2013 20:23:09 +1000
Hullo Vi .......and congratulations on the number of models and experiments
you carry out!! My next trike will not have a roof but the suggestion is a
good one.
I agree that the PSI is more of a problem with the trikes and so a reduced
pivot angle seems necessary. This time I am fitting a damper a la Hipparon
which may help and avoids the unsightly wheel flop when at rest. My
building efforts seem to be rather slow this time, but I should be finished
in the next month. CHanging the pivot angle after construction affects the
whole geometry so that the mid section is either too high or too low, so I
am hoping that 55 degrees will be just right!! Thanks for your comments.
Thanks also Gerald for your comments on pivot angle. Anyone else??
Regards from "Down under"....... Howard
On Tue, Sep 17, 2013 at 3:07 PM, FreeLists Mailing List Manager <
ecartis@xxxxxxxxxxxxx> wrote:
> python Digest Mon, 16 Sep 2013 Volume: 11 Issue: 055
>
> In This Issue:
> [python] Re: python Digest V11 #53
>
> ----------------------------------------------------------------------
>
> Date: Sun, 15 Sep 2013 23:11:12 -0700 (PDT)
> From: Vi Vuong <vi_vuong@xxxxxxxxx>
> Subject: [python] Re: python Digest V11 #53
>
> I have tried as low as 45 deg on both trike and bike, near zero trail? I
> guess trike needs less self-centering from seat rise effect to control.
> Gerald, I notice more PSI on trike with same pivot angle. Do you? Maybe
> I am expecting more from a trike...
>
> Wheel flop is also unpleasant when walking bikes. For trike I tend to
> pull from the front, but somehow a python does not look well when it
> "flops" standing still, not to mention damaging chain ring. I have
> increased low pivot angle to ~60 understanding trade off.
>
>
> Howard, if your MK3 will have a roof also, I suggest attaching a bungee
> cord to the BB to keep both in place, see http://youtu.be/sB1V7Wb5HfQ.
> How about using rod-end pivot for angle adjustment?
>
>
> Vi
>
>
>
> >________________________________
> > From: bepb <bepb@xxxxxx>
> >To: python@xxxxxxxxxxxxx
> >Sent: Sunday, September 15, 2013 10:34 AM
> >Subject: [python] Re: python Digest V11 #53
> >
> >
> >
> >Hi,
> >my python trike too, has a pivot angle around 50 or 52 degree,
> while the bike has 63. Maybe it makes sense because on the bike
> there is some influence from the tilting.
> >Load of 20-30kg is no problem if the slope is not to steep and the
> road has grip. If not, I have problems with the front wheel
> slipping.
> >Obviously, sitting more upright or leaning forward helps but is
> very uncomfortable. Part of the problem is that my trike has a
> very short wheelbase and part of the luggage rack is behind the
> rear axle.
> >
> >Looking forward to see more pictures, both of your MK3 and Pauls
> trike!
> >
> >Cheers
> >Gerald
> >
> >Am 15.09.2013 10:03, schrieb Howard Stevens:
> >
> >Hi all,
> >>I am interested in all the python trike chat at present. I use an Avid
> B7 disc brake on the front wheel and agree that the braking from the front
> brake is so powerful that I see no need for another unless it is as a
> backup brake in case of failure. I have not experienced any tendency to
> jack-knife or lift the rear section. I am interested in what people have
> experienced with loading their trikes and the stability of the pivot joint
> in the recommended low 60's . I have found it necessary to reduce the
> angle to the low 50's I have tried 51 - 52 degrees and found the stability
> wonderful but the wheel flop prevents sharp turning. This time I will try
> 55 degrees. As I am building in f/g and carbon fibre it is not easy to
> make the angle adjustable and so I would really be interested in the
> experiences of others. Cheers Howard Stevens
> >>
> >>
> >>
> >>On Sun, Sep 15, 2013 at 3:08 PM, FreeLists Mailing List Manager <
> ecartis@xxxxxxxxxxxxx> wrote:
> >>
> >>python Digest Sat, 14 Sep 2013 Volume: 11 Issue: 053
> >>>
> >>>In This Issue:
> >>> [python] Re: Building a cargo style trike
> >>>
> >>>----------------------------------------------------------------------
> >>>
> >>>Date: Sat, 14 Sep 2013 07:47:29 +0100
> >>>From: Paul Needham <paul.2.needham@xxxxxxxxx>
> >>>Subject: [python] Re: Building a cargo style trike
> >>>
> >>>Hi all
> >>>
> >>>Sorry but I am new to this mailing list format and don't
> seem to know
> >>>how to add to my own post when I get the mail in digest
> format [ need to
> >>>look that up ].
> >>>
> >>>Thanks for all your replies , I think initially this will be
> a 2 x front
> >>>brake trike and have a shortish wheel base of 36"
> >>>
> >>>If there is insufficient cargo space I will look at making a
> different
> >>>rear end.
> >>>
> >>>The sliding idea did not work as I cannot find any tubing
> with a loose
> >>>enough fit to slide inside another piece far enough to make
> it work.
> >>>
> >>>I had another idea of a 3 bolt extending rear end , a bit
> more work but
> >>>better I though , however that won't work properly as I
> realised the
> >>>rear boom out to the axle slopes down to the pivot.
> >>>
> >>>This means any change in wheel base by moving the axle will
> cause the
> >>>pivot angle to change DOH !
> >>>
> >>>Progress can be followed here :-
> >>>
> >>>
> http://forum.atomiczombie.com/showthread.php/8210-Building-a-python-trike
> >>>
> >>>regards Paul
> >>>
> >>>------------------------------
> >>>
> >>>End of python Digest V11 #53
> >>>****************************
> >>>
> >>>
> >>
> >
> >
> >
>
> ------------------------------
>
> End of python Digest V11 #55
> ****************************
>
>
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