[python] Re: python Digest V11 #67
- From: Howard Stevens <hstevens94@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Tue, 26 Nov 2013 20:01:14 +1000
Hullo pythonites,
Well I have finally completed my trike and had a very successful road
test. This can be seen on http://www.youtu.be/YQ9KTTJJhLE
You may recall the discussions about pivot angle with trikes and my
decision to go for an angle of 55 degrees. I also put a steering damper on
as well ( from a VW beetle). The test has gone very well without any
noticeable PSI and very limited wheel flop. It is ok without the damper
too, but I like the firm steady feel with it, and it is nice that it holds
the front wheel from falling over when parked. To allow my design to fold
necessitated that the pivot be in front of the hips and it is about 100mm
in front of the line of the hips, but it seems, without any
problems. Anyway have a look, and I will be interested in any further
comments. Best wishes Howard
On Thu, Oct 24, 2013 at 3:07 PM, FreeLists Mailing List Manager <
ecartis@xxxxxxxxxxxxx> wrote:
> python Digest Wed, 23 Oct 2013 Volume: 11 Issue: 067
>
> In This Issue:
> [python] python on eBay
> [python] Re: izzy bike
> [python] Re: izzy bike
> [python] Re: izzy bike
> [python] Re: izzy bike
>
> ----------------------------------------------------------------------
>
> Date: Wed, 23 Oct 2013 13:56:51 +0200
> From: =?ISO-8859-1?Q?J=FCrgen_Mages?= <jmages@xxxxxx>
> Subject: [python] python on eBay
>
> Forwarding this for Mark:
>
>
> > Hello everyone
> > I just thought I would draw your attention to the python I am selling on
> > eBay. It was one of two made by Neil Stanley a few years ago. I
> > butchered the smaller of them to fit me and am keeping it, but this one
> > remains untouched. It would suit someone very tall. I think Neil is
> > around 193 cm, with legs to match.
> >
> > Here's the eBay link:
> >
> >
> http://www.ebay.co.uk/itm/recumbent-bicycle-/221301006533#ht_386wt_1170=20
> >
> > Cheers
> >
> > Mark
>
>
>
> ------------------------------
>
> From: Steffen Risse <big.skangster@xxxxxxxxx>
> Date: Wed, 23 Oct 2013 15:02:32 +0200
> Subject: [python] Re: izzy bike
>
> Hi Vi [haɪ̯fɪ <http://de.wikipedia.org/wiki/Liste_der_IPA-Zeichen>] ;o),
> but friction isn't a conastant ratio, and the angle the steering bar has
> for a certain steering angle will change every time. maybe the steering bar
> is sometimes allready like full conrering, but you're still going straight.
> The clamped pullies prevent such situations as long as they don't brake.
> Steffen
>
>
> 2013/10/23 Vi Vuong <vi_vuong@xxxxxxxxx>
>
> > Hi Steffen,
> >
> > Friction steering should be similar to the Izzy's pulley design in a
> sense
> > that input angle is greater output angle due to slippage. However, the
> > "ratio" depends on the input force / slippage. It would be cool if speed
> > sensitive steering is achievable with python. Will report back after
> more
> > experimentation. Here is the handlebar set up I am using,
> > http://en.openbike.org/wiki/FP02
> >
> > Vi
> >
>
>
> ------------------------------
>
> Date: Wed, 23 Oct 2013 15:11:31 +0200
> From: =?UTF-8?B?UGV0ZXIgxaB2YW7EjcOhcmVr?= <peter.svancarek@xxxxxxxx>
> Subject: [python] Re: izzy bike
>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> Content-Transfer-Encoding: 8bit
> What about using pulleys and rope(cable) anchored to pulleys so they
> wouldn't rely on friction?
>
> Dňa 23. 10. 2013 15:02 Steffen Risse wrote / napísal(a):
> > Hi Vi [haɪ̯fɪ <http://de.wikipedia.org/wiki/Liste_der_IPA-Zeichen>] ;o),
> > but friction isn't a conastant ratio, and the angle the steering bar
> > has for a certain steering angle will change every time. maybe the
> > steering bar is sometimes allready like full conrering, but you're
> > still going straight. The clamped pullies prevent such situations as
> > long as they don't brake.
> >
> > Steffen
> >
> >
> > 2013/10/23 Vi Vuong <vi_vuong@xxxxxxxxx <mailto:vi_vuong@xxxxxxxxx>>
>
> > Hi Steffen,
> >
> > Friction steering should be similar to the Izzy's pulley design in
> > a sense that input angle is greater output angle due to slippage.
> > However, the "ratio" depends on the input force / slippage. It
> > would be cool if speed sensitive steering is achievable with
> > python. Will report back after more experimentation. Here is the
> > handlebar set up I am using, http://en.openbike.org/wiki/FP02
> >
> > Vi
> >
>
>
>
>
>
> ------------------------------
>
> From: Steffen Risse <big.skangster@xxxxxxxxx>
> Date: Wed, 23 Oct 2013 16:25:44 +0200
> Subject: [python] Re: izzy bike
>
> that's what izzy does
>
> 2013/10/23 Peter Švančárek <peter.svancarek@xxxxxxxx>
>
> > What about using pulleys and rope(cable) anchored to pulleys so they
> > wouldn't rely on friction?
> >
> > Dňa 23. 10. 2013 15:02 Steffen Risse wrote / napísal(a):
> >
> > Hi Vi [haɪ̯fɪ <http://de.wikipedia.org/wiki/Liste_der_IPA-Zeichen>]
> ;o),
> > but friction isn't a conastant ratio, and the angle the steering bar has
> > for a certain steering angle will change every time. maybe the steering
> bar
> > is sometimes allready like full conrering, but you're still going
> straight.
> > The clamped pullies prevent such situations as long as they don't brake.
> >
> > Steffen
> >
> >
> > 2013/10/23 Vi Vuong <vi_vuong@xxxxxxxxx>
> >
> >
> > Hi Steffen,
> >>
> >> Friction steering should be similar to the Izzy's pulley design in a
> >> sense that input angle is greater output angle due to slippage.
> However,
> >> the "ratio" depends on the input force / slippage. It would be cool if
> speed
> >> sensitive steering is achievable with python. Will report back after
> more
> >> experimentation. Here is the handlebar set up I am using,
> >> http://en.openbike.org/wiki/FP02
> >>
> >> Vi
> >>
> >
> >
>
>
> ------------------------------
>
> Date: Wed, 23 Oct 2013 18:24:18 +0300
> Subject: [python] Re: izzy bike
> From: Tihamer Juhasz <balamber@xxxxxxxxx>
>
> One more detail: I contacted the creator of the Izzy on FB and asked about
> handling. This is what he told me:
> The bike is very easy to ride and manoeuvrable but it takes a few minutes
> to get use to it. This is because, just like you've noticed, caused by the
> wire. It's a bit like learing to ride a bike again , once you get the hang
> of it, it's all smooth sailing from there!
>
> End of quote.
>
> Learning to ride the Python definitely takes longer than a few minutes. So
> it would be really interesting to try this ride-by-wire approach on a
> Python.
>
> Tiha
>
>
>
> On Wed, Oct 23, 2013 at 5:25 PM, Steffen Risse <big.skangster@xxxxxxxxx
> >wrote:
>
> > that's what izzy does
> >
> >
> > 2013/10/23 Peter Švančárek <peter.svancarek@xxxxxxxx>
> >
> >> What about using pulleys and rope(cable) anchored to pulleys so they
> >> wouldn't rely on friction?
> >>
> >> Dňa 23. 10. 2013 15:02 Steffen Risse wrote / napísal(a):
> >>
> >> Hi Vi [haɪ̯fɪ <http://de.wikipedia.org/wiki/Liste_der_IPA-Zeichen>]
> ;o),
> >> but friction isn't a conastant ratio, and the angle the steering bar
> has
> >> for a certain steering angle will change every time. maybe the steering
> bar
> >> is sometimes allready like full conrering, but you're still going
> straight.
> >> The clamped pullies prevent such situations as long as they don't brake.
> >>
> >> Steffen
> >>
> >>
> >> 2013/10/23 Vi Vuong <vi_vuong@xxxxxxxxx>
> >>
> >>
> >> Hi Steffen,
> >>>
> >>> Friction steering should be similar to the Izzy's pulley design in a
> >>> sense that input angle is greater output angle due to slippage.
> However,
> >>> the "ratio" depends on the input force / slippage. It would be cool if
> speed
> >>> sensitive steering is achievable with python. Will report back after
> more
> >>> experimentation. Here is the handlebar set up I am using,
> >>> http://en.openbike.org/wiki/FP02
> >>>
> >>> Vi
> >>>
> >>
> >>
> >
>
>
> ------------------------------
>
> End of python Digest V11 #67
> ****************************
>
>
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