[python] Re: pictures again // small vs big weels
- From: chris williams <chriswilliams67@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 22 May 2013 09:35:36 -0400
Genius! It's inventions like this that make me think we're not just on the
fringes of the cycling world, but on the cusp of bigger things to come :-)
On Wed, May 22, 2013 at 7:21 AM, Tihamer Juhasz <balamber@xxxxxxxxx> wrote:
> Hi Gerald,
>
> Thank you for the reply and the information.
>
> I spent some more time with my Python and this is what it turned into:
> http://myrecumbent.blogspot.ro/2013/05/python-turned-peregrine.html
>
> Regards, Tiha
>
>
> On Tue, May 21, 2013 at 1:58 PM, Gerald <bepb@xxxxxx> wrote:
>
>> **
>> Hi Tiha,
>> my congratulations to you new python, nice work.
>>
>> I ride both, a python with 405 (20") wheels and one with 622 (28") wheels.
>> Both ride nice but also quite differently.
>> Beside the obvious better maneuverability due to the shorter wheelbase,
>> the 20" wheel passes more or less under by legs while cornering. This makes
>> it even more easy to take tight corners.
>> With my 28" Python, the front wheel is actually between my legs, and
>> together with the seat, this limits the maneuverability significantly. But
>> for speed on flat, open roads, the 28" python is the fastest (human
>> powered) bike I have ridden yet.
>> When you pick a big wheel, you should consider the required in seam
>> length of you legs!
>> Check http://en.openbike.org/wiki/Wheel_Sizes.
>> Actually, for a first python you made a clever choice :-).
>>
>> As for moving the pivot behind the seat - one point certainly is if the
>> seat is mounted to the rear or the front part. If the seat is mounted to
>> the front part, the overall steering will change dramatically because you
>> can't steer with you legs anymore. Don't know if you could consider it a
>> python at all.
>>
>>
>> Best regards
>> Gerald
>>
>>
>>
>>
>>
>>
>>
>> On 13.5.13 17:56 , Tihamer Juhasz wrote:
>>
>> Thanks Philip. I made up a drawing for the front section, the wheel
>> cage, in a 3D design sw to calculate the distances and the bend angles.
>> Otherwise there was no precise plan before starting to build it. Just made
>> some calculations on paper and did the rest of design on the fly while
>> building it. The basic idea to run everything horizontal as much as
>> possible was made prior to drawing or fabrication. Just two wheels and a
>> straight line inbetween. Turned out really simple indeed.
>>
>> Tiha
>>
>>
>> On Mon, May 13, 2013 at 5:14 PM, Philip Hahn <everphilski@xxxxxxxxx>wrote:
>>
>>> Tiha,
>>>
>>> I love how clean your bike looks. Did you make up drawing prior to
>>> fabrication or did you go by trial and error?
>>>
>>> Beautiful Python!
>>>
>>> philip
>>>
>>>
>>> On Mon, May 13, 2013 at 6:42 AM, Tihamer Juhasz <balamber@xxxxxxxxx>wrote:
>>>
>>>> Hi all,
>>>>
>>>> Made some more decent pictures and shared them in a Picasa album again:
>>>>
>>>> https://plus.google.com/photos/115292543199069523585/albums/5877419428757741505?authkey=CK7Kp9yb07HK4QE
>>>>
>>>> I hope the pictures explain how the pivot works. It actually works
>>>> well, but it seems not strong enough to last long. Will see.
>>>>
>>>> I presently ride the bike like an agitated orchestra conductor, waving
>>>> around randomly with my arms, but its a lot of fun. Its really refreshing
>>>> to learn something this basic at this age. I make steady progress each time
>>>> I take out the bike, so its reassuring too. Any tips on riding are welcome.
>>>> I did not mount a handlebar yet, so I learn hands free.
>>>>
>>>> A few questions: how much does the trail and wheel size influence the
>>>> riding behaviour of the bike? Are bigger wheels better for riding
>>>> stability? Has anybody tried to have the pivot behind the seat? I would
>>>> imagine that pedal induced steering would be even less if the pivot was
>>>> right behind the seat support point, so almost at the center of gravity and
>>>> behind the rider hip joints. And one more: how about having a reversed
>>>> python? That is, move the pivot back to the hind wheel and have it mirrored
>>>> (at 115 degr (180-65) or having it at 65 degr. This would be a rear steered
>>>> bike I know, but there are a few which work.
>>>>
>>>> Thanks,
>>>> Tiha
>>>>
>>>
>>>
>>
>>
>
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