Following Hirth's death in an aircraft crash in 1938, the Reichsluftfahrtministerium ("Reich aviation ministry") nationalised the company, and in 1941 it was merged with Heinkel to make Heinkel-Hirth. Although the existing engine series were continued, Heinkel also used the Hirth production facilities as a basis for work by Hans von Ohain on a series of jet engines as well under the new name of Heinkel-Strahltriebwerke, although for various reasons none was widely used. Their final design, the Heinkel HeS 011, for which only 19 testing prototype powerplants were ever built, was intended for use in a proliferation of German jet combat aircraft design proposals late in the war.