The Douglas project was a revolution in the field of aviation, as its new design was based on a simple but effective assumption: the body of the machine was "added" only to a mighty center wing with parallel leading and trailing edges, on which other, almost arbitrarily shaped hulls could be placed. This is how the DC-2, its military version of the C-33, the bomber B-18 Bolo and B-23 Dragon were created, and finally the prototype of the DC-3, i.e. the DST (Douglas Sleeper Transport) flying bedroom. After these versions, the plane did not undergo any major external transformations and for the next 9 years over 13,000 externally very similar machines were produced in the world, although the basic type was of course still somehow modified and Douglas himself produced over 25 basic military versions, not counting civilian, special and aircraft manufactured under license in the USSR and Japan. The Douglas C-33 is a twin-engine 16-seat cargo transport aircraft, a military adaptation of the Douglas DC-2 civil airliner. 18 were built (of which 1 was later converted to the C-38). The Douglas C-39 is a twin-engine 18-seat cargo transport plane, a version of the civilian Douglas "DC-2 and 1/2" and military C-33 and C-38 airliners. 35 were built (of which 2 were later rebuilt to the C-42). Technical data (DC-2): Maximum speed: 338 km / h, speed of climb: 5.17 m / s, maximum ceiling 6,930 m, operational range: 1,750 km.
The Douglas C-33 was an American transport plane from the World War II period in the spine-wing configuration with the landing gear retracted in flight in the classic configuration. The flight of the prototype took place in 1936, and serial production continued in the same year. During it, 18 machines of this type were created. The drive was provided by two motors Wright R-1820-25, 750 hp each. The plane did not have permanent on-board weapons.
The C-33 model was developed by the Douglas Aircraft Company for the US Air Force as a development version of the successful DC-2 civil aircraft. Compared to its prototype, it had many differences. First of all, it used other engines as a power unit, the structure of the aircraft was clearly strengthened (especially the fuselage), and all amenities for passengers were removed. The placement of the door leading to the cargo area has also changed. Therefore, despite the external similarity, the DC-2 and C-33 planes were quite different from each other. It is worth adding that the C-39 version was developed based on the C-33 model, which in turn was powered by two engines Wright R-1820-45, 975 HP each. In total, about 35 C-39 aircraft were built.
The Douglas project was a revolution in the field of aviation, as its new design was based on a simple but effective assumption: the body of the machine was "added" only to a mighty center wing with parallel leading and trailing edges, on which other, almost arbitrarily shaped hulls could be placed. This is how the DC-2, its military version of the C-33, the bomber B-18 Bolo and B-23 Dragon were created, and finally the prototype of the DC-3, i.e. the DST (Douglas Sleeper Transport) flying bedroom. After these versions, the plane did not undergo any major external transformations and for the next 9 years over 13,000 externally very similar machines were produced in the world, although the basic type was of course still somehow modified and Douglas himself produced over 25 basic military versions, not counting civilian, special and aircraft manufactured under license in the USSR and Japan. The Douglas C-33 is a twin-engine 16-seat cargo transport aircraft, a military adaptation of the Douglas DC-2 civil airliner. 18 were built (of which 1 was later converted to the C-38). The Douglas C-39 is a twin-engine 18-seat cargo transport plane, a version of the civilian Douglas "DC-2 and 1/2" and military C-33 and C-38 airliners. 35 were built (of which 2 were later rebuilt to the C-42). Technical data (DC-2): Maximum speed: 338 km / h, speed of climb: 5.17 m / s, maximum ceiling 6,930 m, operational range: 1,750 km.