Opel-RAK were a series of rocket vehicles produced by Fritz von Opel, of the Opel car company, in association with others, including Max Valier and Friedrich Wilhelm Sander largely as publicity stunts.
The Lippisch Ente a rocket-powered glider was produced on June 11, 1928, piloted by Fritz Stamer, but is not usually considered part of the series.
- Opel RAK.1 - a rocket car that achieved 75 km/h (47 mph) on March 15, 1928
- Opel RAK.2 - rocket car May 23, 1928 reached a speed of 230 km/h (143 mph) driven by 24 solid-fuel rockets
- Opel RAK.3 rocket train (quoted speed is variously 254 or 290 km/h.) On the second run the train jumps the track and is destroyed.
- Opel Rak IV rocket train, destroyed when a solid rocket explodes on the track, exploding all the other rockets. Railway authorities prohibit further runs.
- Opel RAK.1 rocket glider September 30, 1929
(The names were unfortunately not consistent.)
The 1937 German film Weltraum Schiff I Startet Eine Technische Fantasie has short clips of various RAK vehicles: 11 seconds at 436 feet (approximately 04:47) igniters being wired to the Rak.2 car; 2 seconds at 447 feet (approximately 04:58) Max Valier seated in a RAK.2 car labeled "RÜCKSTOSS VERSUCHS WAGEN"; 2 seconds at 451 feet (approximately 05:00) Fritz von Opel seated in a RAK.2 car; 11 seconds at 460 feet (approximately 05:06) Fritz Von Opel drives the RAK.2 car on 1928 May 23 at the Avus Track in Berlin; 2 seconds at 472 feet (05:14) Sander-Opel RAK.3 rocket car on 1928 June 23 running on railway tracks; 19 seconds at 475 feet (05:16 to 05:35) Opel-Sander RAK.1 rocket glider in 1928 September, preparation and launch; 6 seconds at 536 feet (05:57 to 06:03) Max Valier sitting and talking in a RAK.6 car.