Hi Rob What software are you using for your 3d model? Jan From: Vi Vuong Sent: Wednesday, April 06, 2011 12:28 AM To: python@xxxxxxxxxxxxx Subject: [python] Re: Abs workout from python? Hi Rob, My conduit tube frame & coroplast seats have been ~35deg for lower back and ~25deg for upper back, so ~30deg average in the middle bend, which is not as easy to measure as the flat sections. I use an inclinometer like this one http://www.wizardsatellite.co.uk/index.php?main_page=product_info&cPath=33_69_86&products_id=115 However, on python I notice that my upper back tend to lean forward a little, so I started using 35deg for the upper back as well. Higher angle ~45deg, I start to slip forward out of the seat. Maybe when I gain more experience, I can lay back a little more, and use the headrest also. Good seat contour / contact is more important on python as the back is used to control the bike. I have good experience with artificial grass pads, good for ventilation also http://en.openbike.org/wiki/File:GuineaPigSeatPad.png. I plan to check out foam liner next like Malric's http://1.bp.blogspot.com/-fe3VeP7LQEc/TYeFuZCydUI/AAAAAAAAA8E/UDvAZ5QZ5UE/s1600/DSCN5629small.jpg Hammock seat design that Jürgen used is something worth studying, as it may have the best contour / contact, and angle (adjustable?). Vi -------------------------------------------------------------------------------- From: jan <jlaube@xxxxxxxxxx> To: python@xxxxxxxxxxxxx Sent: Tue, April 5, 2011 7:24:10 PM Subject: [python] Re: Abs workout from python? Hi Rob It seems to me that all you need is a protractor and lots of pictures of pythons. Then measure the angle of the mid part of the seat from the horizontal. This method gives the same results as a number of manufactures specs. Good luck Jan From: Rob Raymakers Sent: Tuesday, April 05, 2011 2:18 PM To: python@xxxxxxxxxxxxx Subject: [python] Re: Abs workout from python? Hello, i'm gathering specifications of the diffirent parts to build a python bike. I got all the sizes/angles/measurements but I can not find how to calculate/measure the angle of a seat. Searches on the internet only give me a range between 19-30 degrees, but not how to measure the angle. Can anyone explain it to me so i can finish my 3d model. Rob