 From 1944 on, the Luftwaffe was suffering from almost continual daytime attacks on its airfields and was finding it almost impossible to conduct large-scale operations.Their preferred solution was to introduce some sort of VTOL interceptor that could be launched from any open location, and there were many proposals for such a system.Heinkel conducted a series of design studies as part of their Heinkel Wespe and Heinkel Lerche programs.