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Mon Jun 06, 2005 12:47 pm
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Fri Jun 10, 2005 5:49 am
There were some USAAC DC-2 derivatives that had both round fuselage and DC-3 fins, the last example remaining being the C-39 at the USAF Museum
Fri Jun 10, 2005 7:06 am
Fri Jun 10, 2005 3:38 pm
Fri Jun 10, 2005 8:01 pm
"The DC-2 was developed from a 1932 TWA Airlines requirement for a replacement for its aging wooden airliners due to the cost of operations and maintenance. TWA’s competitor, United Airlines had ordered Boeing’s 247 Airliner, and locked up production for others until their own needs were met, risking a significant competitive disadvantage to TWA.
Douglas, who had previously only built military aircraft, was keen to secure work for the airlines and responded with the twin engined DC-1, The DC-1 had a design cruise speed of 190 MPH, 30 MPH faster than the Boeing 247 (20% faster), and could carry 14 passengers compared to 10 in the Boeing 247 (40% more load).
As TWA was currently operating trimotor airliners to ensure added safety they demanded demonstration of the DC-1 on single engined performance. A novel demonstration on September 1933 saw the DC-1 depart Arizona's Wimslow airport and cut one engine immediately on takeoff, climb to 8000 feet and cruise to Albuquerque on one engine, arriving there 15 minutes ahead of the TWA Ford Trimotor scheduled flight that had departed Wimslow before it.
TWA immediately ordered twenty DC-2 aircraft which incorporated minor changes to the DC-1 Prototype, before 1934 was over all but one of the major US airlines had the DC-2 on order or in service, and Boeing was unable to sell any further Boeing 247 Aircraft. A total of 198 DC-2 and its military C33 & C39 versions were built before it evolved into the larger "sleeper" DST and DC-3 design as the worlds most successful commercial airliner.
"The DC-3 was intended to have 85% commonality with the DC-2, although in the end the DC-3 was quite different and only able to utilise about 10% of the DC-2's components. Differences included a rounded fuselage to create a 66cm wider floor space, 76cm longer fuselage, increased wing span, more powerful 920 HP Wright Cyclone single row 1820 engines, and enlarged fin and rudder to overcome handling problems in the DC-2. The prototype first flew in December 1935 and only 50 DST aircraft entered service before the DC-3 in standard airliner form caused a revolution in the industry, with a DC-3 costing little more to operate than a DC-2, but offering a 50% increase in payload from 14 to 21 seats, it quickly caused the retirement of most other types such as the 10 seat Boeing 247 then still in United Airlines service."
" By December 1941 when the USA entered the war, 500 DC-3's had been built and a further 369 were on order, the USAAC impressed 10% of operational airline aircraft, and requisitioned new airline aircraft direct from the production line, with those aircraft being designated C48, C49, C50, C52 dependant on the source and engine configuration."
The purpose designed military versions were the C53 "Skytrooper" Troop Transport and the C47 "Skytrain" Cargo Transport. "
The C47 had large cargo doors, strengthened metal floor and tie down points, Pratt and Whitney twin row 1830 engines, stronger landing gear and a glider towing cleat, and first flew in January 1942, with an eventual 9,500 being built. C47/Dakota's served in every allied air force, including the RAAF, which operated 124 lend-lease Dakota's (C47's) under its "A65-" number series and recently retired its last examples after 60 years of service. "
Sat Jun 11, 2005 6:50 am
The C-39 was a mixture of DC-2, DC-3 and military specific parts and assemblies. The plane used a basic DC-2 forward and center fuselage section mated to a DC-3 style aft fuselage and tail. The wing consisted of a DC-3 center section and DC-2 outboard wings. The landing gear was based on the design developed for the Douglas B-18 bomber. Because the C-39 was a essentially a hybrid of DC-2 and DC-3 assemblies it was unofficially known as the DC-2½.
Tue Jun 14, 2005 4:29 am