[python] AW: Re: Thanks Chris! Any everyone else.
- From: Gerald<bepb@xxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 5 Apr 2013 18:03:37 +0200
Hi Chris,
or you just put a few waschers in the rear suspension to increase the pivot
angel :-).
Gerald
-----Ursprüngliche Nachricht-----
Von: chris williams <chriswilliams67@xxxxxxxxx>
An: python@xxxxxxxxxxxxx
Gesendet: Freitag, 05. April 2013 13:07:51 GMT+00:00
Betreff: [python] Re: Thanks Chris! Any everyone else.
Has anyone tried just having very long vertical rear dropouts? By moving
the rear wheel up or down in the drop outs you would effectively change the
pivot angle :-)
Chris.
On Thu, Apr 4, 2013 at 9:12 PM, John Lewis <john.lewis@xxxxxxxxxxxxxxxx>wrote:
> G'day Ivan and the list,
>
> Been following with interest. I've built a heap of bikes but yet to get a
> Python done. I'm looking at a trike version I think.
> Regards the seat ply. I found that 6mm 5 ply bends one direction but not
> the other. I cut two strips with the main lot of grains across so it bends
> and used exterior white glue to put it together in a simple jig. It made a
> beautiful seat. I made a home brew version of a Ventisit pad for it.
>
> BTW My XYL just returned from a trip round NZ on the Dawn Princess. She
> loved it.
> Might catch up on air.
>
> John.
>
> VK6JL
>
>
>
> Ivan van Hoof wrote:
>
>> Hi Kelvin
>>
>> Haven't see you for years! Not since you guys move to the north island.
>> Rung your lovely wife last night and I will talk to you over the weekend by
>> twisted pair. Lots of questions re bikes and a catch up too. Very small
>> world.
>>
>> Ivan van Hoof
>>
>> Sent from my iPad
>>
>> On 3/04/2013, at 10:51 PM, Kelvin Arthur <kelvin.arthur@xxxxxxxxx<mailto:
>> kelvin.arthur@gmail.**com <kelvin.arthur@xxxxxxxxx>>> wrote:
>>
>> Hi Ivan
>>>
>>> Nice to have another Kiwi keen to do the python thing. I have built one
>>> here down under, it started out as something of a mongrel and was
>>> progressively modified over about a year to the final version for now.
>>> My thoughts, having read a lot on the web, built, and riden. Don't
>>> worry about suspension, if you're really concerned about a soft ride, build
>>> a textile seat (some sort of sling arrangement), this softens the ride no
>>> end without sacrificing too much in the power department. It is also easy
>>> to make and adjust. I built a curved wooden seat for a Bachetta clone,
>>> rear wheel drive recumbent recently, while a great seat, MUCH more work
>>> than the sling and it makes the position of it much more critical.
>>> As for pivots, I tried steering ball ends, complete disaster, I then
>>> went to a cup and cone bb, less of a disaster, still not very good. I then
>>> got 2, 12mm male tie rod ends and never looked back, easier to construct
>>> for, gives you about 2 degrees of angle adjustment each way and plenty
>>> strong enough. The final version of pythonui has an adjustable bb at the
>>> front for leg length, a sling seat, and even with a 3 metre wheel base
>>> (yes, it's a monster!) and my 4 year old boy in the back, I never had the
>>> feeling that the pivot wasn't up to the task. My python was transported by
>>> car a lot, being able to undo 2 bolts, and have the bike split was a real
>>> bonus, and allowed me to get it into my hatchback with ease, even the big
>>> version.
>>>
>>> On the gears front, my early version had a derailer, while functional, I
>>> never looked back after getting an in hub gear. It's only a shimano 3
>>> speed, but it's enough. Using an 8 speed hub gear with a coaster brake
>>> would have been a real dream for me, but I built with no budget, scrounging
>>> what I could.
>>> When you first build it, build it to be crashed, a LOT, it will save you
>>> the heartache of having to repair your lovely work!
>>>
>>> My few cents worth, and sorry for the novel.
>>>
>>> Kelvin (yes, it turns out it is a very small world after all!)
>>>
>>> Sent from my iPad
>>>
>>>
>>>
>>> On 3/04/2013, at 21:46, Patrick van Gompel <patrick_van_gompel@hotmail.*
>>> *com <patrick_van_gompel@xxxxxxxxxxx> <mailto:patrick_van_gompel@**
>>> hotmail.com <patrick_van_gompel@xxxxxxxxxxx>>> wrote:
>>>
>>> Hello,
>>>>
>>>> The option I use for an adjustable pivot point is a 'rod end joint'.
>>>> You can see it here: http://cycle.free-creativity.**
>>>> com/images/python5.jpg<http://cycle.free-creativity.com/images/python5.jpg>
>>>> The rod ends are protected by a rubber boot. The cheapest and best seller
>>>> I have found is: http://mcgillmotorsports.co.**
>>>> uk/index.php?act=viewCat&**catId=25<http://mcgillmotorsports.co.uk/index.php?act=viewCat&catId=25><
>>>> http://mcgillmotorsports.co.**uk/index.php?act=viewCat&**catId=25<http://mcgillmotorsports.co.uk/index.php?act=viewCat&catId=25>>
>>>> They have 3 types, but I prefer the 'High Performance'.
>>>>
>>>> At the moment I use M12 size, which is strong enough, but for my next
>>>> project I am going for M14 as I am building a utility trike and needs to be
>>>> very strong.
>>>> Not sure how many degrees I can adjust the pivot, but it depends on
>>>> your design (the distance between the two rod ends and the size of them).
>>>> If you need detailed info about those rod ends, like thread length or max.
>>>> angle; it's available (just ask).
>>>> Though, you can't adjust the pivot 'on the go'. You need to detach the
>>>> front and rear part and use shims to fit the rod ends on the pivot axle
>>>> without play.
>>>>
>>>> Ivan, I don't think you need suspension. Of course, my big apple 26"
>>>> tires are more comfortable than racing tires, but it is like you compare a
>>>> ride on a mountainbike with fat tires to that of a racing bike, I think. My
>>>> experience with recumbents in general is that a nice seat with a good
>>>> cushion does also give you a more comfy ride.
>>>>
>>>> Greetings,
>>>> Patrick
>>>>
>>>> ------------------------------**------------------------------**
>>>> ------------
>>>>
>>>> Date: Wed, 3 Apr 2013 10:53:21 +0300
>>>> Subject: [python] Re: Thanks Chris! Any everyone else.
>>>> From: balamber@xxxxxxxxx <mailto:balamber@xxxxxxxxx>
>>>> To: python@xxxxxxxxxxxxx <mailto:python@xxxxxxxxxxxxx>
>>>>
>>>>
>>>> Hi Ivan,
>>>>
>>>> A working adjustable pivot is technically very difficult to do in my
>>>> opinion. I tried to build a test bike with an adjustable pivot to test
>>>> different bike geometries but it tended to buckle all the time. I would
>>>> suggest that if you really need to change the bicycle geometry, instead of
>>>> an adjustable pivot add front and/or back suspensions with a pretty large
>>>> range of adjustment and use them to raise/lower the front and rear of the
>>>> bike. This way you change the pivot angle as well.
>>>> If anyone has a good idea/mechanism of an adjustable pivot with a +/-
>>>> 15 degrees of range or even more please share it. Infinitely
>>>> adjustable/stepless adjustment preferred.
>>>>
>>>> That's my two cents.
>>>>
>>>> Tiha
>>>>
>>>>
>>>> On Wed, Apr 3, 2013 at 10:09 AM, Ivan van Hoof <zl3tiv@xxxxxxxxx<mailto:
>>>> zl3tiv@xxxxxxxxx>> wrote:
>>>>
>>>> That sounds like one nice seat! Bending ply or snake ply, I will
>>>> have to make my seat out that stuff. Any thoughts on the main
>>>> pivot? I like the simple bottom crank design but I want a design
>>>> that is simple looking, sleek and adjustable angle by a few
>>>> degrees to account for other riders weights and lengths. Good to
>>>> see the group is active, very quick replies from you guys is great!
>>>> I have shown, told a few work mate and friends the web site and
>>>> they are keen to see me finish my python and ride it.( and a few
>>>> think am crazy.)
>>>> How smooth is the ride of these bike with 700c or 26 inch wheel
>>>> on the road( no off road) would I need suspension? I intend to
>>>> only use the bike for touring on the road. I'm thinking no
>>>> suspension to save weight.
>>>> Thanks guys for your help.
>>>>
>>>> Ivan van Hoof
>>>> ZL3TIV
>>>>
>>>> Sent from my
>>>> iPad==========================**==============================**
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