Thanks Amrit
I have both articles - re the Heinkel 176 one, was written by my husband and I - see his credit (Douglas Downer-Smith) at the bottom of the page ! - but thank you nonetheless.
Does anyone have any information about this project, known as Test Stand XII. I am researching this - unusual topic for a woman - but there you go. I'm a researcher, and do anything from this to genealogy.
The intention was to tow containers attached to Tupe XX1 subs across the Atlantic...