His most noteworthy contributions were rocket motors for the Messerschmitt Me 163 and Bachem Ba 349 interceptor aircraft , so-called `` Starthilfe '' jettisonable rocket propulsion units used for a variety of Luftwaffe aircraft during World War II , and a revolutionary new propulsion system for submarines known as air-independent propulsion ( AIP ) .
His most noteworthy contributions were rocket motors for the Messerschmitt Me 163 and Bachem Ba 349 fighter planes . He designed JATO ( jet-assisted take-off ) units for various Luftwaffe aircraft during World War II , and a revolutionary new propulsion system for submarines known as air-independent propulsion ( AIP ) .