[python] Re: pictures again // small vs big weels
- From: Tihamer Juhasz <balamber@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 24 May 2013 06:54:08 +0300
Hi Gerald,
sure, thank you for sending it further.
Tiha
On Fri, May 24, 2013 at 12:07 AM, Gerald <bepb@xxxxxx> wrote:
> **
> Hi Thia,
> now this is great! Ride & Fly!
>
> If you don't mind, will send the link to some friends from my paragliding
> club - I am a paraglider pilot, too :-).
> They know my python and I guess they will like the idea of a flying bike.
>
> BR
> Gerald
>
>
>
>
>
> On 22.5.13 15:35 , chris williams wrote:
>
> 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
>>>>>
>>>>
>>>>
>>>
>>>
>>
>
>
Other related posts:
