Correct Michel the proper name was Projekt Schwimmweste (project swim vest) and also known as Apparat F. From December 1944 Dr Dickmann led a team of engineers to create Lafferenz capsules. It's more commonly known as Pruffstand XII.Michel Van said:That also called "Projekt Schwimmweste" (Project life jacket)
after some German literature it was also part of "Amerika Bomber Projekt"
were a German Sub pulls one V-2 cannisters to U.S. Coastline
the chance to launch the rocket was Zero, because the U.S. Navy gona bomb if the Sub show up.