The Fieseler Fi 333 was a prototype transport aircraft developed by Fieseler

Fieseler

The Gerhard Fieseler Werke was a German aircraft manufacturer of the 1930s and 40s. The company is remembered mostly for its military aircraft built for the Luftwaffe during the Second World War.-History:...

, and backed by the Luftwaffe

Luftwaffe

Luftwaffe is a generic German term for an air force. It is also the official name for two of the four historic German air forces, the Wehrmacht air arm founded in 1935 and disbanded in 1946; and the current Bundeswehr air arm founded in 1956....

. The aircraft was to utilise detachable pods of varying sizes to carry cargo

Cargo

Cargo is goods or produce transported, generally for commercial gain, by ship, aircraft, train, van or truck. In modern times, containers are used in most intermodal long-haul cargo transport.-Marine:...

, a system that would allow a rapid turnaround on the ground. The very tall braced undercarriage

Undercarriage

The undercarriage or landing gear in aviation, is the structure that supports an aircraft on the ground and allows it to taxi, takeoff and land...

 was made unretractable so that the fuselage would be able to take the strain of the heavy cargo.

Three prototype aircraft were constructed, but with the distinctive undercarriage missing. The cargo pod system was tested on several other Fieseler

Fieseler

The Gerhard Fieseler Werke was a German aircraft manufacturer of the 1930s and 40s. The company is remembered mostly for its military aircraft built for the Luftwaffe during the Second World War.-History:...

 and Messerschmitt

Messerschmitt

Messerschmitt AG was a famous German aircraft manufacturing corporation named for its chief designer, Willy Messerschmitt, and known primarily for its World War II fighter aircraft, notably the Bf 109 and Me 262...

aircraft, but shortly after these tests the project was cancelled.