Thanks again Guys, much appreciated.
I don't know much about the bow from Bodman.
It's found at the border of lake constance, close to where I live. I'ts estimated to be 3000-3500bc. Its obviously made of a pretty difficult to work piece yew with a few branches. It's a typical paddle-bow-design. It's a very crooked stick in the historical mueseum of Constance. Jürgen Junkmans took measurments and documented it in the book :das Bogenbauerbuch- "Nachbau des Bogens von Bodman".
I started one with the original measurements also and must say: No way that bow would shoot: Only 59.5" long, with a thickness of almost 20mm and a width of 35mm in the main bending zone it would have been super strong and break alreday at a short draw. Maybe the find was an unfinished bow. Maybe it was deflexed unstrung. Maybe its made of some strange kind of compression yew which allows bending athick diameters. Nobody knows...
cheers