[python] Re: python Digest V11 #56
- From: Howard Stevens <hstevens94@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sat, 21 Sep 2013 22:00:13 +1000
Hi Patrick,
By stability I was referring to the amount of PSI I was experiencing. I am
sure you are right that if the pivot was in line with the hips I would have
less problems but then I want a folding trike and have only been able to
achieve this by folding at the rear of the pivot and in front of the seat.
The other factor has been mentioned by Dirk Bonne, and that is that with
many trikes the rear section weight adversely affects the amount of
PSI.When I am riding again I will be able to continue this discussion.
Cheers Howard
On Thu, Sep 19, 2013 at 3:07 PM, FreeLists Mailing List Manager <
ecartis@xxxxxxxxxxxxx> wrote:
> python Digest Wed, 18 Sep 2013 Volume: 11 Issue: 056
>
> In This Issue:
> [python] Re: python Digest V11 #55
> [python] Re: python Digest V11 #55
> [python] Re: python Digest V11 #55
> [python] minimalseat
> [python] Re: minimalseat
>
> ----------------------------------------------------------------------
>
> Date: Wed, 18 Sep 2013 20:23:09 +1000
> Subject: [python] Re: python Digest V11 #55
> From: Howard Stevens <hstevens94@xxxxxxxxx>
>
> 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
> > ****************************
> >
> >
>
>
>
> ------------------------------
>
> From: Patrick van Gompel <patrick_van_gompel@xxxxxxxxxxx>
> Subject: [python] Re: python Digest V11 #55
> Date: Wed, 18 Sep 2013 16:50:34 +0200
>
> Hi Howard,
> I have just done some measuring on my trike (for a pic see:
> http://cycle.free-creativity.com although nowadays I use ropes and no
> second steering handle), but I am not sure how useful it will be for you
> since I have a tilting trike. At the moment the angle is 67 degrees. It has
> been lower in the beginning I think, when I didn't use ropes and had the
> rod ends at neutral. The reason I adjusted the rod ends for a bigger angle
> wasn't because for steering issues but to get more clearance between the
> mudguard and my seat. Didn't notice much difference for the steering after
> that adjustment.
> Stability has always been great (except when slipping the front wheel). As
> a matter of fact, using the Jetrike tilting system was a bit too stable for
> my taste: at higher speeds it was hard to corner (lean enough). So I
> adjusted some arm lengths to lessen the seat rize effect for better high
> speed cornering. It's still not 100% the way I would like it, but the trike
> does it's job and is now more than 2 years old with many miles on it. I use
> it as a SUV (or should we call it SUC: Sports Utility Cycle?) for pulling a
> big trailer (part of my job as a garderner) and sometimes for speed
> (together with a friend's Strada).
>
> Not sure what you exactely mean by : "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."
> Can you describe 'stability' a bit more? What went wrong/undesirable while
> cycling? At low speed/high speed?
> What I suspect is that the CoG has a lot to do with it. As with the
> Python: when you steer to the left, the CoG will move to the right. With a
> Python you can adjust this by leaning to the left, but your trike can't. I
> think what happens is that when you steer your tike to the left the CoG
> will move to the right and generates a force for more steering input. (not
> really sure but just a theory). Think about it: you want to move to the
> left, but your CoG goes to the right. That is counterintuitive in my eyes.
> My question: does the trike have a tendency to flip when cornering at
> speed?
> Lowering the pivot angle might help since your legs (and therefore the
> CoG) leans more into the corner, but as you say you run into other problems
> like wheel flop.
>
> "I agree that the PSI is more of a problem with the trikes and so a
> reduced pivot angle seems necessary.
> I don't agree. Why would it be more of a problem? Why reduce the pivot
> angle? I think to keep PSI as low as possible you would better stick to the
> Python theory: having the pivot line going through your hips. If you can't
> manage that with an 60-65 degree angle then you should shift your pivot.
>
> Kind greetings,
> Patrick
>
> Date: Wed, 18 Sep 2013 20:23:09 +1000
> Subject: [python] Re: python Digest V11 #55
> From: hstevens94@xxxxxxxxx
> To: python@xxxxxxxxxxxxx
>
> 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
>
> ****************************
>
>
>
>
>
>
> ------------------------------
>
> Date: Wed, 18 Sep 2013 21:07:01 +0200
> From: bepb <bepb@xxxxxx>
> Subject: [python] Re: python Digest V11 #55
>
> Hi Patrick,
> I agree, trike or bike, the pivot axle should got through the hips. I
> don't have any serious issues with PSI. I guess having the pivot a bit
> more to the rear is better for stability than a bit more forward.
> Vi actually I am not sure there is much difference in the PSI between my
> bike and trike. But actually, I never tried the 63 degree pivot angle on
> the trike.
> Also, the trike has a significant shorter wheelbase which I think should
> make the PSI more noticeable.
>
> Concerning wheel flop, all my pythons, two bikes and the trike, show
> significant wheel flop. During the ride it seems no issue. Pushing one
> off the bike is cumbersome. I pick it up and carry it if I can't avoid
> it. With the trike, I just take one pedal and pull it behind me if
> required. Actually it rarely is necessary.
> My bike parks standing on its wheels and one of the pedals. This
> actually saves the kickstand :-).
>
>
> Best regards
> Gerald
>
>
>
> Am 18.09.2013 16:50, schrieb Patrick van Gompel:
> > Hi Howard,
> >
> > I have just done some measuring on my trike (for a pic see:
> > http://cycle.free-creativity.com although nowadays I use ropes and no
> > second steering handle), but I am not sure how useful it will be for
> > you since I have a tilting trike. At the moment the angle is 67
> > degrees. It has been lower in the beginning I think, when I didn't use
> > ropes and had the rod ends at neutral. The reason I adjusted the rod
> > ends for a bigger angle wasn't because for steering issues but to get
> > more clearance between the mudguard and my seat. Didn't notice much
> > difference for the steering after that adjustment.
> > Stability has always been great (except when slipping the front
> > wheel). As a matter of fact, using the Jetrike tilting system was a
> > bit too stable for my taste: at higher speeds it was hard to corner
> > (lean enough). So I adjusted some arm lengths to lessen the seat rize
> > effect for better high speed cornering. It's still not 100% the way I
> > would like it, but the trike does it's job and is now more than 2
> > years old with many miles on it. I use it as a SUV (or should we call
> > it SUC: Sports Utility Cycle?) for pulling a big trailer (part of my
> > job as a garderner) and sometimes for speed (together with a friend's
> > Strada).
> >
> > Not sure what you exactely mean by : "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."
> > Can you describe 'stability' a bit more? What went wrong/undesirable
> > while cycling? At low speed/high speed?
> > What I suspect is that the CoG has a lot to do with it. As with the
> > Python: when you steer to the left, the CoG will move to the right.
> > With a Python you can adjust this by leaning to the left, but your
> > trike can't. I think what happens is that when you steer your tike to
> > the left the CoG will move to the right and generates a force for more
> > steering input. (not really sure but just a theory). Think about it:
> > you want to move to the left, but your CoG goes to the right. That is
> > counterintuitive in my eyes.
> > My question: does the trike have a tendency to flip when cornering at
> > speed?
> > Lowering the pivot angle might help since your legs (and therefore the
> > CoG) leans more into the corner, but as you say you run into other
> > problems like wheel flop.
> >
> > "I agree that the PSI is more of a problem with the trikes and so a
> > reduced pivot angle seems necessary.
> > I don't agree. Why would it be more of a problem? Why reduce the pivot
> > angle? I think to keep PSI as low as possible you would better stick
> > to the Python theory: having the pivot line going through your hips.
> > If you can't manage that with an 60-65 degree angle then you should
> > shift your pivot.
> >
> > Kind greetings,
> > Patrick
> >
> > ------------------------------------------------------------------------
> > Date: Wed, 18 Sep 2013 20:23:09 +1000
> > Subject: [python] Re: python Digest V11 #55
> > From: hstevens94@xxxxxxxxx
> > To: python@xxxxxxxxxxxxx
> >
> > 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 <mailto: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 <mailto: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 <mailto:bepb@xxxxxx>>
> > >To: python@xxxxxxxxxxxxx <mailto: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 <mailto: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
> > <mailto: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
> > ****************************
> >
> >
>
>
>
>
> ------------------------------
>
> Date: Thu, 19 Sep 2013 00:21:49 +0200
> From: christiananders@xxxxxxx
> Subject: [python] minimalseat
>
> Hi guys
>
> The bulkiest part of a python and many other recumbents is the seat.
> Pythons like Olafs Monty (16") and the Tihas bigger 20"
> http://myrecumbent.blogspot.ro/2013/05/python-turned-peregrine.html
> are nice, because split apart they are pretty small. But the seat keeps
> being bulky.
>
> I could not find any seats like the one I think about. But when doing my
> research I found this wooden seat http://hebike.borec.cz/DSCN9094s.jpg.
> Removing those round sticks from the seat would come close to my idea.
> So basically there are two anatomically formed tubes that just are
> linked together on the ends. Those two tubes are on both sides of your
> spine and are covered with some elastic material to get some comfort. If
> that fits your back very well I would think that comfort is ok and the
> bike is getting much smaller for transport without the need to seperate
> the seat from the rest of the bike.
>
> Do you have some (alternate) ideas for that (a) nonbulky seat?
>
>
> regards,
>
> christian
>
> ------------------------------
>
> Date: Wed, 18 Sep 2013 19:48:54 -0400
> Subject: [python] Re: minimalseat
> From: chris williams <chriswilliams67@xxxxxxxxx>
>
> Hi Christian,
> I've brought up my preferred seat construction method here before, but am
> happy to pass it on again.
> I use a type of flexible plywood sometimes called snake ply or wiggle wood
> that I've had no problem finding in local lumber yards. I simply make a
> female form out of regular plywood, lay a piece of flexible ply in it,
> slather indoor/outdoor wood glue on it, lay a second piece on top then
> weigh it all down with sand bags. When the glue dries the two flexible
> layers of ply can no longer flex and voila, you've got a light and cheap
> seat :-) Good luck.
> Chris Williams
> On 2013-09-18 6:22 PM, <christiananders@xxxxxxx> wrote:
> > Hi guys
> >
> > The bulkiest part of a python and many other recumbents is the seat.
> > Pythons like Olafs Monty (16") and the Tihas bigger 20"
> > http://myrecumbent.blogspot.ro/2013/05/python-turned-peregrine.html
> > are nice, because split apart they are pretty small. But the seat keeps
> > being bulky.
> >
> > I could not find any seats like the one I think about. But when doing my
> > research I found this wooden seat http://hebike.borec.cz/DSCN9094s.jpg.
> > Removing those round sticks from the seat would come close to my idea.
> > So basically there are two anatomically formed tubes that just are
> > linked together on the ends. Those two tubes are on both sides of your
> > spine and are covered with some elastic material to get some comfort. If
> > that fits your back very well I would think that comfort is ok and the
> > bike is getting much smaller for transport without the need to seperate
> > the seat from the rest of the bike.
> >
> > Do you have some (alternate) ideas for that (a) nonbulky seat?
> >
> >
> > regards,
> >
> > christian
> > ============================================================
> >
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> >
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> >
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> >
> >
>
>
>
> ------------------------------
>
> End of python Digest V11 #56
> ****************************
>
>
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