Hi One of my Pythons is on eBay at present: http://www.ebay.co.uk/itm/recumbent-bicycle-/221301006533#ht_386wt_1170 The auction closes on 29 October. Apologies if you get this or similar message three times. I seem to be having trouble with my list registration. Cheers Mark Dr Mark Boyd Youth Manager UK Headquarters The Lodge, Sandy, Bedfordshire SG19 2DL Tel 01767 693310 rspb.org.uk <http://www.rspb.org.uk> <http://www.rspb.org.uk/homes> <http://www.rspb.org.uk/> The RSPB is the country’s largest nature conservation charity, inspiring everyone to give nature a home. Together with our partners, we protect threatened birds and wildlife so our towns, coast and countryside will teem with life once again. We play a leading role in BirdLife International, a worldwide partnership of nature conservation organisations. The Royal Society for the Protection of Birds (RSPB) is a registered charity: England and Wales no. 207076, Scotland no. SC037654 From: python-bounce@xxxxxxxxxxxxx [mailto:python-bounce@xxxxxxxxxxxxx] On Behalf Of Ole Blente Sent: 25 October 2013 08:20 To: python@xxxxxxxxxxxxx Subject: [python] Re: izzy bike Vi: Im sure, you are right about the upright position. It is true for all bikes I think. On my Toxy CR there is a big difference when the seat is lovered. "Standing" is superior to "lying" when it comes to maneuver and learning. "Lying" is superior in speed. 2013/10/25 Vi Vuong <vi_vuong@xxxxxxxxx> Hi Tiha, It seems that upright sitting position and "normal" handlebar help a lot. Other negative-trail bikes seem easy to learn also, http://www.google.com/search?q=low+rider+bicycle. Perhaps a more upright python may be easier to learn. Seat angle can be lowered with more experience. Not sure if handlebar would help learning python, gloves and sticks do. Handlebar on python seems to be good for fine control at high speed, beyond what the legs can do... Vi ________________________________ From: Tihamer Juhasz <balamber@xxxxxxxxx> To: python@xxxxxxxxxxxxx Sent: Wednesday, October 23, 2013 8:24 AM Subject: [python] Re: izzy bike 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 <tel:23.%2010.%202013> 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