One late version of the engine added a small rocket motor (the BMW 109-718) at the rear and usually just above the exhaust of the engine, which added some thrust each for three to five minutes, for take off and short dashes. In this configuration, it was known as the BMW 003R and was tested, albeit with some serious reliability problems, on single prototypes for advanced models of the Me 262 (the Me 262C-2b "Heimatschützer II" Defender II), and He 162 (He 162E). Both prototypes flew under hybrid jet/rocket power during March 1945, though records do not indicate the results of testing with the 162E.