[python] Re: python Digest V11 #56
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Sun, 22 Sep 2013 11:28:36 -0700 (PDT)
Hi Howard,
I think your roof rounds out folding package nicely, besides providing shade.
Just did a test of our big roof in the rain. The body is covered pretty well,
but not the legs as the rain can fly in almost to the knee.
http://youtu.be/L2KVo5_DS1U
According the DirkB, the damper is also used in the Flevo to prevent flopping
at rest, but degrades steering somehow,
//www.freelists.org/post/python/PSI,2. A metal frame pivoting at the rear
has similar restriction but quite smooth on steering,
http://youtu.be/nrV-bAKlyac, perhaps due the difference in geometry and
materials...
Vi
----------------------------------------------------------------------
>>
>>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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>>
>>
>>
>>------------------------------
>>
>>End of python Digest V11 #56
>>****************************
>>
>>
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