Thanks for this. Has anyone actually flown cryogenic toroidal tanks? The Soviets/Russians have used them since the '60s, but to my knowledge, only for hypergols.
Originally a public domain film, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).https://www.youtube.com/watch?v=UiRh3M2T9ZY?t=001
I suspect today a lot of this would be done using Friction Stir Welding (without an HAZ) or lasers for a very small HAZ. Likewise shape measuring would be done by co ordinate measuring machines. A good question would be will they stay with chem milling to thin the tank walls or a high accuracy CNC router.