During the 1920s, German daredevils had experimented with using solid-fuel rockets to propel cars, motorcycles, railway carriages, snow sleds, and, by 1929, aircraft such as Alexander Lippisch's Ente and Fritz von Opel's RAK.1.
Heinkel He 111 | Heinkel | Heinkel He 112 | Heinkel HeS 3 | Heinkel He 70 | Heinkel He 59 | Heinkel He 177 | Heinkel He 162 | Heinkel He 118 | Heinkel He 115 | ''The Virgin and Child with Canon van der Paele'', Oil on wood, 141 x 176.5 cm (including frame), 1434-36. Groeningemuseum | Japanese submarine I-176 | Interstate 176 | Heinkel Kabine | Heinkel He 219 | Heinkel He 176 | Heinkel He 12 | Heinkel He 114 |
During the late 1930s, German scientists, such as Wernher von Braun and Hellmuth Walter, investigated installing liquid-fueled rockets in military aircraft (Heinkel He 112, He 111, He 176 and Messerschmitt Me 163).