The Douglas DC-4, - 6, and - 7 Piston Airliners

1. Introduction to the Douglas DC-4, DC-6 and DC-7 show translation during the 1940s and 1950s tractor engine piston aircraft represent great development. 2. DC -4 reduced travel times sparked growing acceptance of air transport over the existing rail means offering improved security and reliability, as well, during the end of the 1930s, large-capacity, long-range aircraft sparked the need, especially for frequent transcontinental service delivery to meet the goal still elusive. Based, therefore, on the foundations laid by the all-metal, twin-engine DC -3 monoplane, Douglas Aircraft Company for the design of a larger study of successor five US carriers, American, Eastern, Pan Am, TWA, inclusive of an association of Once started and combined each $ 100,000 a prototype that includes the current progress, yet at the same time offering a tricycle undercarriage power plants, double the number of rest, and a large number of passengers contributed to the development of adjusted. Results traditionally configured, a short, straight wings, vertical tail, a triple, four 1,400 horsepower Pratt and Whitney Hornet twin engine, and seating for up to 52 games in a pressurized cabin, the sky before June 21, 1938 and took .

Designated DC 4E, it is a phenomenal speed of 190 mph and a range of 2000 miles offered. However, the then huge, 65,000-pound aircraft a well-appointed galley and improved considerably, including smoking and dressing room, it represented too much of a leap to the era, and the sponsorship of both the carrier and the reduction in the size of the requested modifications. Equally low passenger demand due to fears of pending war, Douglas is a small, unpressurized fuselage accommodating 42, a short period, slender wing, and replaced it with a more conventional single vertical fin, which fixed the DC-4 result. World War II, in the event, the program has provided a far greater impact than anticipated. Indeed, the notorious Pearl Harbor December 7, 1941, the remaining 24 aircraft were ordered by the United States and the first of these to use and demand from the US Army Air Corps were draped in the Japanese attack on military dress, previously, on February 14 the following year flew now designated C-54 Skymaster. R5Ds were identified as those operated by the Navy. War, at least in terms of production, a positive impact on the type, with 1,163 military versions were eventually built by 1945, while 79 additional, purely commercial counterparts after this time were constructed. The first, conducted by the American Overseas Airlines, the first post-war transatlantic service Hurn, from New York to England, inaugurated the goose, Newfoundland, and Shannon, Ireland in October through. Many former military C -54 s were converted to commercial standards and types of airlines' after the war formed the backbone of the fleet. Four 1,450 hp Pratt and Whitney R-2000-2 SD-13G Twin Wasp radial engines powered by DC -4 93.5 ft overall length, a 117.6-foot wingspan, and featured a 1,462 square foot area. A maximum payload of 14,200 pounds, the aircraft can cruise at 207 mph, carrying a 73,000-pound gross weight, and the 1,150- to 2,180-mile stretch fly zones, its payload on the fuel ratio depends. Both profitable and flexible, it can accommodate up to 86 single-class passengers, particularly attractive for charter or nonscheduled carriers, and optionally an upward-opening door after the installation of the main deck cargo is. 3. DC -6 anticipated postwar order to meet the demand and Lockheed's own comparable, tractor engine L 649 / -74 9 to stay competitive with Constellation aircraft, the Douglas DC-4 from 81 inches, the process confirming that in its configuration as a standard for long-distance transport would work. Although its wings, planform, period, region, and hydraulically actuated, double slotted flaps retain the original DC -4 E offered by pressing it briefly resume and match it to increase its passenger capacity. TWA Constellation's attempt to compete with both the US and 50 respectively for the joint launch orders placed late in 1944 and will become DC 35 -6. Basically the US Army Air Force, thus, aims to initially designated XC-112, the first of four 2,100 horsepower Pratt and Whitney February 15, 1946, driven by R-2800-34 engine flew in prototype form, however, the resolution of the World with war II, they now need a military version, the first four months after leaving the commercial version to take to the sky. However, 4 out of DC on which it was based, similar to the many design variations offered DC -6. Powered by 2,100 horsepower, 18-cylinder, two-row, air-cooled, three-bladed, electrical deiced propeller, for example, it has launched passenger windows and a rectangular characteristic squared Pratt and Whitney R-2800- CA15 Double Wasp engine tail off. Its wings, tail, and the windshield was provided with thermal anti-icing. Internally, it is an electronic autopilot system, an automatic pressure control system, air (temperature and humidity) conditioning, radiantly heated floors and walls, and the ability to accept pre-loaded cargo containers painted. 8.10 feet wide and seven feet high, 20 inches wide by 46 in the lounge aft of the cabin, Douglas, designed to accommodate up to four-abreast seat pitch of 40 inches, with six. First flying on July 10, 1946 and November 27 during a joint ceremony to launch the US and have joint customers, this service was inaugurated on April 27 next year, eastbound and westbound transcontinental program 11 hours ten hours affording. Cabin configuration varied by carrier.