As promised I will start my high altitude journey. My aim is to come up with some videos until next summer. Yes you are right it is too much time but I need to start from some where and there is too much to learn. Here are some basic sketches how it is designed for in the first place   Basic calculation and assumptions. From: http://www.chem.hawaii.edu/uham/lift.html Lift of Helium Balloons Dia. Ft.  Vol. l     Lift…