Thank you. I got to 411k by 245x41x41 (figures in GP). Yes that's not a cylinder but I am just doing very rough maths. I did not think about the useful lift

Thank you. I got to 411k by 245x41x41 (figures in GP). Yes that's not a cylinder but I am just doing very rough maths. I did not think about the useful lift - so while the Hindenburg is a 100 years old, a lift of 232k kg was competing with a empty weight of 215. incredible - and thanks for the links It still seems back of the envelope that lighter than air lift is just not generally useful