[1] During 1942, while still working on the Messerschmitt Me 163 rocket fighter, Alexander Lippisch conceived a larger but similarly tailless bomber with twin jet engines buried in a thick wing, designated P.11.
The engines were placed quite close together inside the wing, with intakes in the roots and the otherwise straight trailing edge cut back for the exhausts.
Around this time Lippisch conceived of a "power wing", a hollow monocoque shell whose interior formed the internal duct of the main powerplant.
He initially intended the Delta VI to have such a wing construction, but later drawings suggest that this was too difficult to realise under the prevailing war conditions.
The prototype was moved to a new site but could not be completed before the Russian arrival in Vienna caused Lippisch and his colleagues to flee.