The Boeing 247 production lineEarly versions had the windshield raked forward, this was change to being raked back. The reasons for this had to do with the glare of lights on the windows
Boeing introducing a host of aerodynamic and technical features into a new commercial airliner building on work with the earlier Monomail (Models 200, 221, 221A) mailplanes and B-9 bomber designs. The Boeing 247 was faster than the best U.S. fighter of its day, the open-cockpitbiplaneBoeing P-12.[6] The low landing speed of 62mph (100km/h) avoided the need for flaps, and pilots learned that at speeds as low as 10mph (16km/h), the 247 could be taxied "tail high" for ease of ground handling.[7]
The 247 could fly on one engine. With controllable-pitch propellers, the 247 could maintain 11,500ft (3,500m) at maximum gross weight on one engine.[8] Aside from its size, much lower wing loading, and the wing spar obstructing the cabin, many of its features became the norm for airliners, including the Douglas DC-1, before World War II.[5] Originally planned as a 14-passenger airliner powered by Pratt & Whitney R-1690 Hornetradial engines, the preliminary review of the design concept by United Air Lines' pilots had resulted in a redesign to a smaller, less capable configuration, powered by R-1340 Wasp engines.[9][10][11]
One concern of the pilots was that in their view, few airfields could safely take an eight-ton aircraft.[10] They also objected to the Hornet engines, which had a detonation problem when using the available low octane fuel, and suffered from excessive vibration.[12]Pratt & Whitney's chief engineer, George Mead, knew the problem would be resolved eventually,[10] but P&W's president, Frederick Rentschler acquiesced to the airline pilots' demand. The decision created a rift between Mead and Rentschler.[10] Despite the disagreements, the 247 would be Boeing's showcase exhibit at the 1933 Chicago World's Fair.[13]
The slope of the early 247's windshield was reversed from normal. This was a design solution, also used on other contemporary aircraft, to the problem of control panel instrument lights reflecting off the windshield, but the reversed windshield reflected ground lights instead, especially during landings, and it also increased drag.[14][15] By the introduction of the 247D, the windshield was sloped normally, and the glare was resolved with a glarescreen extension over the panel.[16]
Boeing incorporated design elements to enhanced passenger comfort, such as the thermostat controlled, air conditioned, and noise-proofed cabin. The crew included a pilot and copilot, as well as a flight attendant (then known as a "steward"), who could tend to passenger needs.[17] The main landing gear did not fully retract; a portion of the wheels extended below the nacelles, typical of designs of the time, as a means of reducing structural damage in a wheels-up landing. The tailwheel was not retractable. While the Model 247 and 247A had speed-ring engine cowlings and fixed-pitch propellers, the Model 247D incorporated NACA cowlings and variable-pitch propellers.[18]
Operational history
United Airlines crew members and employees stand in front of a Boeing 247A Boeing 247D in its MacRobertson Air Race markings, c.1934: Note the inaccurate race number and dramatic pose in this fanciful 1935 illustrated card art.A stewardess points to the markings on a Boeing 247 that commemorate finishing third in the MacRobertson Air Race.
As the 247 emerged from its test and development phase, the company further showcased its capabilities by entering a long-distance air race in 1934, the MacRobertson Air Race from England to Australia. During the 1930s, aircraft designs were often proven in air races and other aerial contests. A modified 247D was entered, flown by Colonel Roscoe Turner and Clyde Pangborn.[19] The 247, race number "57", was essentially a production model, but all airliner furnishings were removed to accommodate eight additional fuselage fuel tanks.[20] The MacRobertson Air Race attracted aircraft entries from all over the globe, including both prototypes and established production types, with the grueling course considered an excellent proving ground, as well as an opportunity to gain worldwide attention. Turner and Pangborn came in second place in the transport section (and third overall), behind the Boeing 247's eventual rival, the new Douglas DC-2.[21]
Being the winner of the 1934 U.S. Collier Trophy for excellence in aviation design, the first 247 production orders were earmarked for William Boeing's airline, Boeing Air Transport.[20] The 247 was capable of crossing the United States from east to west eight hours faster than its predecessors, such as the Ford Trimotor and Curtiss Condor. Entering service on May 22, 1933, a Boeing Air Transport 247 set a cross-country record of 19+1⁄2 hours on its San Francisco to New York City inaugural flight.[1][22]
Boeing sold the first 60 247s, an unprecedented $3.5 million order, to its affiliated airline, Boeing Air Transport (part of the United Aircraft and Transport Corporation, UATC), at a unit price of $65,000.[5][8] TWA (Transcontinental & Western Air) also ordered the 247, but UATC declined the order, which resulted in TWA President Jack Frye setting out requirements for a new airliner and funding Don Douglas to design and build the Douglas DC-1 prototype. Douglas eventually developed the design into the DC-2 and DC-3.[5]
The Boeing design had been the first to enter series production, but the 247 proved to have some serious deficiencies. Airlines considered its limited capacity a drawback, since it carried only 10 passengers, in five rows with a seat on each side of the aisle, as well as a stewardess. Compared to the more spacious DC-2 and later DC-3, the passenger count was too few to make it a commercially viable airliner.[21] Another feature influencing passenger comfort was that the 247's main wing spar ran through the cabin, so persons moving through the cabin had to step over it.[23] The Lockheed Model 10 Electra had a similar configuration, and while it was a more compact design, the Electra managed to carry the same number of passengers at a slightly better overall performance, and at a lower cost-per-mile.[21]
Seventy-five 247s were built; Douglas collected 800 civil orders for DC-3s before the Pearl Harbor attack, and produced over 10,000 DC-3s, including wartime production of C-47s, while the rival Lockheed Electra "family" was eventually to reach over 3,000 in its various civil and military variants. Boeing Air Transport bought 60 examples, United Aircraft Corp. 10, Lufthansa ordered three, but only two were delivered,[24][25] and one went to a private owner in China. While the industry primarily standardized on Boeing's competitors, many of United's aircraft were later purchased by Western Air Express at "bargain-basement prices".[26]
The 247 remained in airline service until World War II, when several were converted into C-73 transports and trainers. The Royal Canadian Air Force's 121 Squadron operated seven 247Ds as medium transports during the early part of the war.[27] One of these aircraft was donated to the Royal Air Force (RAF) for radar testing, where it was renumbered DZ203. DZ203 was passed among several units in the RAF before being used to make the world's first fully automatic blind landing on 16 January 1945.[28]
Warlord "Young Marshal" Zhang Xueliang ordered two Boeing 247Ds for his air force. He used one of them, named Bai-Ying (White Eagle), during the Xi'an incident in 1936, during which he flew into the opposing Nationalist army's camp at Sian (now rendered as Xi'an) under a secret truce, and had their leader, Generalissimo Chiang Kai-shek, arrested, ending the civil war between the Communist and Nationalist armies, so they could fight together against the Japanese invaders.[29]
A number of specially modified variants included a Boeing 247Y appropriated from United for Air Corps use as a test aircraft fitted with two machine guns in the nose. The same installation later was fitted to a 247Y owned by Generalissimo Chiang Kai-shek. This aircraft also featured a Colt .50in (12.7mm) machine gun in a flexible mount.[30] A 247D purchased by the British RAF became a testbed for instrument approach equipment and received a nonstandard nose, new powerplants, and fixed landing gear.[31] Some 247s were still flying in the late 1960s as cargo transports and business aircraft.[21]
The Turner/Pangborn 247D still exists. Originally flown on September 5, 1934, it was leased from United Airlines for the 1934 MacRobertson Air Race and returned to United, where it served in regular airline service until 1937. Subsequently, the 247D was sold to the Union Electric Company of St. Louis for use as an executive transport. The Air Safety Board purchased the aircraft in 1939 and it remained in use for 14 years before it was donated to the National Air and Space Museum, Washington, DC. It is displayed today with two sets of markings, the left side is marked as NR257Y, in Colonel Turner's 1934 MacRobertson Air Race colors, while the right side is painted in United Airlines livery, as NC13369.[19]
Variants
Boeing 247 prototype at Boeing Field, circa 1933A 247 in the 1950s
Twin-engined civil transport airliner, initial production version
247A
Powered by new 625hp (466kW) P&W Wasp, on special order for Deutsche Luft Hansa in 1934
247E
This designation was given to the first Boeing 247 aircraft, it was used to test a number improvements that were later incorporated into the Boeing 247D.
247D
Original one-off was a race aircraft designed for the MacRobertson Air Race; use of Hamilton Standard variable-pitch propellers allowed for a 7mph (11km/h) gain; the 247D configuration incorporated in production series bearing the same name.
247Y
Armed version, one exported to China, second used for trials
C-73
Designation for Boeing 247D airliners "drafted" into military service in USAAF, 27 in total
Model 280
Proposed development of Boeing 247 with 14 seats and 700hp (520kW) P&W Hornet engines
A Pacific Air Transport 247, NC13345 (c/n 1727), crashed on takeoff after the pilot became disoriented in fog and low visibility; four of ten on board died.[34]
November 24, 1933
A National Air Transport 247, NC13324 (c/n 1705), was being ferried from Chicago to Kansas City when it crashed near Wedron, Illinois, killing all three crew.[35]
February 23, 1934
A United Air Lines 247, NC13357 (c/n 1739), crashed in Parley's Canyon in fog near Salt Lake City, killing all eight on board.
December 20, 1934
United Air Lines Flight 6, a 247 (NC13328, c/n 1709), struck a tree and crashed near Western Springs, Illinois, due to carburetor icing; all four on board survived. The aircraft involved was repaired and converted to 247D standard in July 1935 and returned to service;[36] the aircraft was pressed into USAAF service in 1942 and redesignated as C-73 with tail number 42-57210. The aircraft was damaged in a wind storm at Duncan Field, Texas, on August 30, 1942, and was written off.[37]
March 24, 1935
The sole 247 operated by Lufthansa (D-AGAR, c/n 1945) was damaged beyond economical repair in a collision with an Air France aircraft on the ground at Nuremberg and then scrapped[25]
September 1, 1935
Western Air Express 247, NC13314 (c/n 1695), was being ferried from Burbank, California, to Saugus, California, when it struck high tension power lines after takeoff, killing all three on board.[38]
October 7, 1935
United Airlines Flight 4, a 247D (c/n 1698), went down about 10mi (16km) west of Cheyenne, Wyoming due to pilot error. Three crew and nine passengers killed, there were no survivors.[39]
October 30, 1935
United Air Lines Boeing 247D, NC13323 (c/n 1704), crashed during an instrument checkflight near Cheyenne, killing the four crew members aboard.[40]
A 247 being operated by the Luftwaffe's proving ground at Rechlin (formerly D-AKIN of Lufthansa, c/n 1944) crashed at Hannover, Germany, during a test flight,[25] killing seven of eight on board. The aircraft was being used as a testbed for an experimental autopilot.
March 13, 1939
A SCADTA 247D, C-149, crashed near Manzanares, Caldas, Colombia, killing all eight on board.[44]
February 27, 1940
A SCADTA 247D, C-140, struck El Mortino mountain near Tona, Santander, Colombia, killing all 11 on board.[45]
July 30, 1942
A Northwest Airlines C-73, 42-68639 (c/n 1717, former NC13335), crashed and burned on takeoff from Wold Chamberlain Field, near Minneapolis, Minnesota, killing all 10 on board.[46]
The Boeing 247 at the Museum of Flight in the city of Tukwila, just south of Seattle
c/n 1729, N13347
Static display, flown after restoration at the Museum of Flight Restoration Center, Paine Field, Snohomish County, Washington, USA, to the Museum of Flight main facility on 26 April 2016 where it was subsequently installed in that museum's Air Park.[48]
↑ Holcomb, Kevin. "The Boeing 247." Airminded.net webpage showing initial and final windshield angles and glare screen installation in the 247D, 2009. Retrieved: July 26, 2009.
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