Douglas DC-4

Douglas DC-4
Name	Douglas DC-4
Caption	A Pan American World Airways DC-4 in flight.
Type	Airliner and military transport aircraft
National origin	United States
Manufacturer	Douglas Aircraft Company
First flight	February 14, 1942
Introduction	1942 with United States Army Air Forces
Status	In limited service
Primary user	United States Army Air Forces (historical)
Number built	1,315
Developed into	Douglas DC-6

Douglas DC-4. The Douglas DC-4 is a four-engine piston-engine airliner and military transport aircraft developed by the Douglas Aircraft Company in the late 1930s. Although its commercial debut was delayed by World War II, it became a foundational postwar airliner for carriers like Pan American World Airways and American Airlines. Its robust design and performance directly led to the development of the more advanced Douglas DC-6 and Douglas DC-7.

Development and design

The project originated from a requirement by several major airlines, including United Airlines and Trans World Airlines, for a new four-engine airliner superior to the Douglas DC-3. The initial prototype, the Douglas DC-4E, was an ambitious, complex aircraft that proved uneconomical. Douglas subsequently designed a smaller, simpler aircraft, which first flew in 1942. Key features included a retractable landing gear, a pressurized fuselage on early models (later omitted for simplicity), and a distinctive tricycle landing gear configuration. With the outbreak of World War II, the United States Army Air Forces commandeered the production line, ordering the aircraft as the C-54 Skymaster and R5D for the United States Navy.

Operational history

The DC-4's operational history is dominated by its immense military service during World War II. The C-54 Skymaster became the premier long-range transport for the USAAF, playing critical roles in theaters across the Pacific Ocean and Europe, including support for the Berlin Airlift. After the war, hundreds of surplus aircraft were converted for civilian use, providing the backbone for the expansion of global air travel. Airlines such as KLM, SAS, and BOAC used it to establish intercontinental routes. It also saw extensive use as a cargo aircraft and was operated by figures like Howard Hughes.

Variants

The primary variant was the military C-54 Skymaster, which had numerous sub-variants like the C-54A and C-54B. The United States Navy equivalent was designated the R5D. The definitive civil production model was the DC-4-1009, a post-war design with increased fuel capacity and seating for up to 86 passengers. Other significant conversions included the Canadair North Star, a Rolls-Royce Merlin-powered version built by Canadair for the Royal Canadian Air Force and Trans-Canada Air Lines, and the Aviation Traders Carvair, a specialized car ferry modification.

Operators

Major civil operators spanned the globe and included Pan American World Airways, American Airlines, KLM, and South African Airways. The military was the largest operator, with the United States Army Air Forces, United States Air Force, and United States Navy using it extensively. Many other air forces utilized the type, including the Royal Air Force, the French Air Force, and the Israeli Air Force. Cargo carriers such as Flying Tiger Line and Slick Airways were also significant users well into the 1960s.

Accidents and incidents

The DC-4 was involved in numerous notable accidents. In 1947, a United Airlines flight crashed near Paradise, Utah, killing all 52 on board. The 1948 Northwood mid-air collision involved a British European Airways DC-4 over England. A Sabena DC-4 crashed in Italy in 1949. Perhaps the most famous incident is the 1954 Cathay Pacific Miss Macao hijacking, which was the first recorded aircraft hijacking for ransom. Other significant losses involved Air India, Linea Aeropostal Venezolana, and the United States Air Force.

Specifications (DC-4-1009)

* **Crew:** 4 * **Capacity:** 86 passengers (typical) * **Length:** 93 ft 10 in (28.6 m) * **Wingspan:** 117 ft 6 in (35.8 m) * **Height:** 27 ft 6 in (8.38 m) * **Empty weight:** 43,300 lb (19,640 kg) * **Max takeoff weight:** 73,000 lb (33,112 kg) * **Powerplant:** 4 × Pratt & Whitney R-2000 radial engines, 1,450 hp (1,081 kW) each * **Maximum speed:** 280 mph (450 km/h, 240 kn) * **Cruise speed:** 227 mph (365 km/h, 197 kn) * **Range:** 4,250 mi (6,840 km, 3,690 nmi) * **Service ceiling:** 22,300 ft (6,800 m)

Category:Aircraft Category:United States airliners 1940–1949