Opel RAK Motorbike
Designer: Fritz von Opel
Engine: Opel OHV 500cc single-cylinder, 22 hp
Rocket engine: 6 Powder rocket with 5 kg of explosives
Rocket Supplier: Frederick Sander, Bremerhaven
Chassis: pressed steel frame and fork
Wheelbase: 1400 mm
Chassis Manufacturer: Ernst Neumann Neander
Vehicle weight: 180 kg curb weight
Top speed: over 200 km / h
Year: 1928
Opel Kadett A Spider Italsuisse
Designer: Pietro Frua
Base Vehicle: Opel Kadett A super-luxury sedan.
Engine: 1.0 litre
Hp: 60 Hp, Base engine had 48Hp @ 5400rpm.
Number Built: 2. One built as a test vehicle and the other was a Geneva show car.
1 still survives today, the test vehicle was scrapped in 1983.
Year: 1964
Opel Kapitän (Wood Gas Generator) 
Body: Kapitän
Engine: 6-cylinder, 3.5-liter
Year: 1938
How it works:
A charcoal burner actually burns the gases produced by heated wood. The burner is a two part system: a closed chamber with chunks of wood in it, and a charcoal burner to heat the closed chamber and make the wood generate gases by a process called pyrolysis.
Flammable gases produced by pyrolysis are then routed to a carburetor of sorts, mixed with air, and burned in the engine’s combustion chambers. Once the wood in the closed chamber has produced gases and turned to charcoal, it is transferred to the charcoal burner to heat the next load of wood. Some charcoal-fueled cars were designed to be started on gasoline, and would then be switched to charcoal once the vehicle was underway.
A swiss Kadett C with the same system!
