Tag Archives: Douglas Aircraft Company

10 July 1942

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Douglas XA-26 first flight, 10 July 1942. (Boeing Historical Archives/Wikipedia)

10 July 1942: At the Douglas Aircraft Company El Segundo Division, located at the southeast section of Los Angeles Municipal Airport (now, LAX), company engineering test pilot Benjamin Odell Howard took the prototype Douglas XA-26-DE light bomber, serial number 41-19504,¹ for its first flight.

Douglas XA-26 prototype in flight. (Douglas Aircraft Company/SDASM)

The XA-26 was twin-engine mid-wing monoplane with retractable tricycle landing gear. Douglas had proposed the design to the U.S. Army Air Corps as a replacement for three different airplanes: The Douglas A-20, the North American Aviation B-25 Mitchell, and the Martin B-26 Marauder. It was to be operated by a pilot, navigator/bombardier and a gunner.

Douglas XA-26.

The prototype was 51 feet, 2 inches (15.596 meters) long, with a wingspan of 70 feet, 0 inches (21.336 meters) and overall height of 18 feet, 6 inches (5.639 meters). Its empty weight was 21,150 pounds. It was powered by two air-cooled, supercharged, Pratt & Whitney R-2800–27 (Double Wasp 2SB-G), with a normal power rating of 1,600 horsepower at 2,400 r.p.m. to 5,700 feet (1,737 meters) and 1,450 horsepower to 13,000 feet (3,962 meters); and 2,000 horsepower at 2,700 r.p.m., for military and takeoff power. The engines drove three-bladed propellers through a 2:1 gear reduction. The R-2800-27 was 6 feet, 3.72 inches (1.923 meters) long, 4 feet, 4.50 inches (1.334 meters) in diameter and weighed 2,300 pounds (1,043 kilograms).

Douglas XA-26 (Douglas Aircraft Company/SDASM)

The XA-26’s maximum speed was 322 knots (370 miles per hour/595 kilometers per hour) at 17,000 feet (5,182meters) and it had a service ceiling of 31,300 feet (9,540 meters).

Douglas XA-26 light bomber prototype, 42-19504. (Douglas Aircraft Company)

A second prototype, designated XA-26A was developed as an night fighter. It carried air-intercept radar in the nose and armament in a pod under the fuselage. The third prototype, the XA-26B, was a ground attack aircraft. Like the XA-26A, it had a solid nose, but was armed with a fixed 75-millimeter cannon in the nose, and forward-firing Browning .50-caliber machine guns. When ordered into production, the XA-26 became the A-26C Invader, while the ground attack design was assigned A-26B.

Douglas XA-26A night fighter prototype, 42-19505, photographed 6 July 1943. Note the weapons pod beneath the fuselage. (Douglas Aircraft Company/SDASM)
Douglas XA-26B ground attack prototype, 42-19588, photographed 14 May 1943. (Douglas Aircraft Company E.S. 31578/Boeing Historical Archives)
Douglas XA-26 42-19504, photographed 29 April 1943. (Douglas Aircraft Company/SDASM)

Benjamin Odell Howard was born 4 February 1904 at Palestine, Texas. He was the third of four children of Sam T. Howard, a real estate agent, and Fanie Howard.

Ben O. Howard, 1924 (The Savitar)

Ben Howard graduated from the University of Missouri at Columbia in 1924 with a degree in engineering. While there he was a member of the Kappa Sigma (ΚΣ) fraternity and the Reserve Officers Club.

On 10 Dec 1932, Howard married Miss Olive Maxine Schoen at Independence, Missouri.

In 1933, they lived in Kansas City, Missouri. He was employed as a pilot for United Air Lines Inc.

In 1935, Ben Howard won the Bendix Trophy Race flying Mister Mulligan, a Howard DGA-6. His time was 8 hours, 33 minutes, 16.3 seconds, for an average speed of 238.70 miles per hour.

Mister Mulligan, the Howard DGC-6, NR273Y. (SDASM)

On his 1940 Selective Service (conscription, or draft) card, Howard was described as having a dark complexion, black hair and brown eyes. He was 5 feet, 11 inches (180 centimeters) tall, and weighed 165 pounds (75 kilograms).

After a lengthy illness, Benjamin Odell Howard died at his home in Brentwood, California, 4 December 1970.

¹ Every source checked by TDiA identifies the prototype XA-26 as “41-19504.” Photographs of the XA-26, XA-26A and XA-26B clearly show the 1942 serial numbers 219504, 219505 and 219588 (42-19504, 42-19505 and 42-19588).

© 2019, Bryan R. Swopes

9 July 1962, 09:00:09 UTC, T + 13:41

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Fireball of Operation Dominic-Fishbowl Starfish Prime, 248 miles (399.1 kilometers) above the Pacific Ocean, 9 July 1962. (U.S. Department of Defense)

9 July 1962: At 09:00:09 UTC, the United States detonated a thermonuclear warhead over the Pacific Ocean. This was part of the Operation Dominic-Fishbowl test series at Johnston Island, and was designated Starfish Prime.

A Thor missile is launched from Johnston Island. Note the instrumentation pods at the base of the rocket. (Johnston Memories)

At 08:46:28 UTC, a Douglas Thor DSV2E orbital launch vehicle, serial number 195,  was launched from missile complex LE-1 on Johnston Island, carrying a W-49 warhead in an AVCO Corporation Mk-2 reentry vehicle. The rocket also carried three instrumentation pods which were jettisoned at pre-selected altitudes. The W-49 reached a peak altitude of 600 miles (965 kilometers) along a ballistic trajectory, and then began to descend.

Starfish Prime fireball was visible from Honolulu, Oahu, Hawaii, 898 miles (1,445.2 kilometers) from Ground Zero. “Widespread red air glow (6300 å) amid dark clouds, caused mostly by x-ray-excited atomic oxygen (i.e., oxygen by photoelectrons liberated by Starfish X-rays)” (Commission to Assess Threat to the United States from Electromagnetic Pulse (EMP) Attack, 2004, at Page 5)
Starfish Prime (atomicarchive.com)

The W-49 detonated 36 kilometers (22 miles) southwest of Johnston Island at an altitude of 400 kilometers (246 miles) with an explosive yield of 1.45 megatons. The point of detonation deviated from the planned Air Zero by 1,890 feet (576 meters) to the north, 2,190 feet (668 meters) east, and +617 feet (188 meters) in altitude. The fireball was clearly visible in the Hawaiian Islands, more than 800 miles (1,288 kilometers) away.

The electromagnetic pulse (EMP) damaged electrical systems in The Islands, cutting power, damaging equipment and interrupting telephone systems. Brilliant auroras were visible, lasting about 7 minutes.

Telstar, an American communications satellite that was placed in Earth orbit the following day, was also damaged by residual radiation from the detonation.

The Starfish Prime experiment was for the purpose of “Evaluation of missile kill mechanisms produced by a high altitude nuclear detonation.” The electromagnetic effects on communications were also studied.

A Douglas SM-75/PGM-17A Thor IRBM. (U.S. Air Force)
A Douglas SM-75 Thor IRBM (DM-18A) is launched at Launch Complex 17B, Cape Canaveral Air Force Station, Florida, 12 May 1959. (U.S. Air Force)

The Thor DSV2E was an orbital launch variant of the Douglas Aircraft Company SM-75 Thor IRBM. This was a single-stage nuclear-armed intermediate-range ballistic missile, 61 feet, 3.91 (19.692 meters) long and 8 feet, 0.00 inches (2.438 meters) in diameter. With the Mk-2 reentry vehicle, the overall length of the missile was 63 feet, 7.38 inches (19.390 meters). It weighed 109,800 pounds (49,805 kilograms) at liftoff and 6,889 pounds (3,124 kilograms) at burnout.

The SM-75 was powered by one Rocketdyne LR79-NA-9 rocket engine which produced 150,000 pounds of thrust (667.23 kilonewtons). Two Rocketdyne LR101-NA-9 vernier engines of 1,000 pounds thrust (4.45 kN), each, provided directional control and thrust adjustments. The Thor was fueled with kerosene and liquid oxygen sufficient for 156 seconds of main engine burn time.

The Thor could reach a maximum speed of 11,020 miles per hour (17,735 kilometers per hour) and had a maximum range of 1,500 miles (2,414 kilometers).

The W-49 thermonuclear warhead was designed by the Los Alamos Scientific Laboratory (LASL) and is believed to be a development of the earlier B-28 two-stage radiation-implosion bomb. It incorporated a 10-kiloton W-34 warhead as a gas-boosted fission primary, and had a one-point-safe safety system. The warhead had a diameter of 1 foot, 8 inches (0.508 meters) and length of  4 feet, 6.3 inches (1.379 meters). It weighed 1,665 pounds (755 kilograms).

The flash from the Starfish-Prime detonation, photographed from Maui in the Hawaiian Islands 15 seconds after detonation. (Los Alamos National Laboratory)
The flash from the Starfish-Prime detonation, photographed from Maui in the Hawaiian Islands, 15 seconds after detonation. (Los Alamos National Laboratory)

© 2020, Bryan R. Swopes

1 July 1933

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The prototype Douglas DC-1, X223Y, takes off from Clover Field, Santa Monica, California, 1 July 1933. (Airport Journals)

1 July 1933: 12:36 p.m., the Douglas DC-1 took off from Clover Field, Santa Monica, California, on its first flight. In the cockpit were Carl Anson Cover and Fred Herman.

Douglas DC1 X223Y. (SDA&SM)

The duration of the flight was just twelve12 minutes. during the flight both engines lost power several times. It was later determined that the engines’ carburetors had been installed backwards. This caused their floats to close when the airplane was in a climb.

Douglas DC-1 X223Y (San Diego Air & Space Museum, Michael Blaine Collection, Catalog #: Blaine_00263

The Douglas DC-1 was a prototype commercial transport, built by the Douglas Aircraft Company, Santa Monica, California. It was a twin-engine, all-metal, low-wing monoplane with conventional landing gear. It had a flight crew of two pilots, and provisions for 12 passengers.

Douglas DC-1 NC223Y. (American Aviation Historical Society, via Smithsonian Magazine)

The new airplane had been requested by Transcontinental and Western Air, Inc. It would be required to take off on a single engine from Winslow, Arizona—at 4,941 feet (1,506 meters) above Sea Level, the highest airfield in the T.W.A. route—and to climb to an altitude of 10,000 feet (3,048 meters), again on only one engine. It was required to carry more passengers than the Boeing Model 247, and to have a landing speed of 55 miles per hour (89 kilometers per hour).

The Douglas DC-1, X223Y, in flight. (Larry Westin)

The DC-1 was 60 feet, 0 inches (11.288 meters) long, with a wing span of 85 feet, 0 inches (25.908 meters), and height of 16 feet, 0 inches (4.877 meters). Its empty weight was 11,780 pounds (5,343 kilograms), and gross weight, 17,500 pounds (7,938 kilograms).

The DC-1 was powered by two supercharged, air-cooled, Wright Cyclone SGR-1820-F3 nine-cylinder radial engines, These engines had a compression ratio of 6.4:1 and required 87-octane gasoline. They were rated at 700 horsepower at 1,950 r.p.m. They turned three-bladed variable-pitch propellers throug a 16:11 gear reduction. The -F3 was 3 feet, 11-3/16 inches (1.199 meters) long, 4 feet, 5¾ inches (1.365 meters) in diameter, and weighed 1,047 pounds (475 kilograms).

Douglas DC-1 X223Y at Grand Central Air Terminal, Glendale, California.

The DC-1 had a cruise speed of 190 miles per hour (306 kilometers per hour) and maximum speed of 210 miles per hour (338 kilometers per hour). Its range was 1,000 miles (1,609 kilometers), and the service ceiling was 23,000 feet (7,010 meters).

Only one DC-1 was built. It was rolled out of its hangar 22 June 1933. Registered X223Y, it made its first flight, 1 July 1933, at Clover Field, Santa Monica, California, with test pilots Carl Cover and Fred Herman in the cockpit.

NC223Y was retired from passenger service in 1936. T.W.A. loaned it to the U.S. government for  high altitude research. In May 1938 NC223Y was sold to The Right Honourable Vicount Forbes at Croydon, 27 May 1938, and registered G-AFIF, 25 June 1938. It was re-sold to France, in September 1938. The DC-1 was again sold, this time to Spanish Republican government, and operated by Lineas Aéreas Postales Espanolas, also known as LAPE. The airplane made a forced landing at Malaga, Spain, in December 1940. It was damaged beyond repair.

Wreck of the Douglas DC-1, Malaga, Spain. (Weird Wings)
A model of the Douglas DC-1 being tested in the Guggenheim Aeronautics Laboratory (GALCIT) 10-foot wind tunnel at the California Institute of Technology (CalTech) in Pasadena, California. (California Institute of Technology)

© 2023 Bryan R. Swopes

30 June 1975

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The last operational U.S. Air Force C-47 Skytrain, 43-49507, on display at NMUSAF. (U.S. Air Force)

30 June 1975: The last operational Douglas C-47 Skytrain transport in service with the United States Air Force, 43-49507, was retired and flown to the National Museum of the United States Air Force at Wright-Patterson Air Force Base, Ohio.

A C-47D, it is on display in the World War II Gallery, painted and marked as C-47A-80-DL 43-15213 of the 91st Troop Carrier Squadron, 439th Troop Carrier Group, during World War II. At the time it was withdrawn from service, 43-49507 had flown a total of 20,831 hours.

43-49507 (Douglas serial number 26768) was built at Oklahoma City as a C-47B-15-DK Skytrain. The C-47B differed from the C-47A in that it was powered by Pratt & Whitney Twin Wasp S3C4-G (R-1830-90) engines. These engines were equipped with two-speed superchargers for improved high-altitude performance. Following World War II, the second speed (“high blower”) was either disabled or removed. Following this modification, the airplane was redesignated C-47D.

A group of new Douglas C-47 Skytrains. The airplane closest to the camera is C-47-DL 41-18415. (Douglas Aircraft Company)

The Douglas C-47 Skytrain is a military transport variant of the Douglas Aircraft Company DC-3 commercial airliner. It is an all-metal, twin-engine, low-wing monoplane with retractable landing gear. It was operated by a minimum flight crew of two pilots, navigator, radio operator and mechanic/load master. The airplane’s control surfaces are covered with doped-fabric. The primary differences between the civil DC-3 and military C-47 was the addition of a cargo door on the left side of the fuselage, a strengthened cargo floor, a navigator’s astrodome and provisions for glider towing.

The DC-3 made its first flight 17 December 1935, while the C-47 flew for the first time six years later, 23 December 1941.

Two Douglas C-47 Skytrains. Nearest the camera is C-47A-90-DL 43-15661. The further airplane is C-47A-65-DL 42-100550. (U.S. Air Force)

The C-47 is 64 feet, 5½ inches (19.647 meters) long with a wingspan of 95 feet (28.956 meters) and height of 17 feet (5.182 meters). The total wing area is 988.9 square feet (91.872 square meters). The angle of incidence is 2°. The wing center section is straight, but outboard of the engine nacelles there is 5º dihedral. The wings’ leading edges are swept aft 15.5°. The trailing edges have no sweep.  Empty weight of the C-47D is 17,865 pounds (8,103 kilograms) and the maximum takeoff weight is 33,000 pounds (14,969 kilograms).

The C-47A was powered by two 1,829.4-cubic-inch-displacement (29.978 liter) air-cooled, supercharged R-1830-92 (Pratt & Whitney Twin Wasp S1C3-G) two-row 14-cylinder radial engines with a compression ratio of 6.7:1. These were rated at 1,060 horsepower at 2,550 r.pm., up to 7,500 feet (2,286 meters), maximum continuous power, and 1,200 horsepower at 2,700 r.p.m. at Sea Level for takeoff. Each engine drives a three-bladed Hamilton Standard Hydromatic constant-speed full-feathering propeller with a diameter of 11 feet, 6 inches (3.505 meters) through a 16:9 gear reduction. The R-1830-92 is 48.19 inches (1.224 meters) long, 61.67 inches (1.566 meters) in diameter, and weighs 1,465 pounds (665 kilograms).

U.S. Army paratroopers jump from Douglas C-47-DL Skytrain 41-7805, over England, May 1944. (U.S. Air Force)

The specifications of the  Pratt & Whitney Twin Wasp S3C4-G (R-1830-90) installed on the C-47B and C-47D were nearly the same as the -92 engine of the C-47A. Displacement and compression ratio were identical. The engines’ diameters were the same, though the -90 was very slightly longer than the -92—1.85–2.74 inches (4.699–6.960 centimeters), depending on specific variant. Also, the -90 was heavier than the -92 by 25–30 pounds (11.34–13.61 kilograms), again, depending on the specific variant. The R-1830-90 could maintain 1,000 horsepower at 2,550 r.p.m. at 12,500 feet (3,810 meters), and 1,000 horsepower at 2,700 r.p.m. at 14,000 feet (4,267 meters), a significant increase over the -92.

The C-47D has a cruising speed of 161 knots (185 miles per hour/298 kilometers per hour) at 10,000 feet (3,048 meters), and maximum speed of 202 knots (232 miles per hour/374 kilometers per hour) at 3,500 feet (1,067 meters). Its service ceiling was 22,150 feet (6,751 meters). The Skytrain had a maximum range of 1,026 nautical miles (1,181 miles/1,900 kilometers) with full cargo.

The C-47 could carry 9,485 pounds (4,302 kilograms) of cargo, or 27 fully-equipped paratroopers. Alternatively, 24 patients on stretchers could be carried, along with two attendants.

C-47 Skytrains in Vee-of Vees formation.

On D-Day, The Sixth of June, 1944, a formation of C-47 Skytrains, nine airplanes abreast, 100 feet (30 meters) from wing tip to wing tip, 1,000 feet (305 meters) in trail, stretching for over 300 miles (483 kilometers), airdropped 13,348 paratroopers of the 82nd and 101st Airborne Divisions, United States Army, and another 7,900 men of the British Army 6th Airborne Division and the 1st Canadian Parachute Battalion, behind the beaches at Normandy, France.

During the Vietnam War, 53 C-47s were converted from their transport role to AC-47 Spooky gunships. These were armed with three fixed, electrically-powered General Electric  GAU-2/A .30-caliber (7.62 NATO) Gatling guns firing out the left side of the fuselage. These aircraft were highly effective at providing close air support. The three Miniguns could fire a total of 12,000 rounds per minute.

Douglas AC-47D Spooky gunship, 45-0927, 4th Special Operations Squadron, Nha Trang, Republic of Vietnam, September 1968. (U.S. Air Force)
Douglas DC-3 (C-47B) three-view drawing. (NASA)

Douglas Aircraft Company built 10,174 C-47 Skytrains at its factories in Santa Monica and Long Beach, California, and at Oklahoma City, Oklahoma.

© 2018, Bryan R. Swopes

30 June 1956

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United Airlines' Douglas DC-7 City of San Francisco, sister ship of Mainliner Vancouver.
United Airlines’ Douglas DC-7 City of San Francisco, N6301C, sister ship of Mainliner Vancouver. (UAL)

30 June 1956: At approximately 10:32 a.m., two airliners, United Airlines’ Douglas DC-7 serial number 44288, Mainliner Vancouver, Civil Aeronautics Administration registration N6324C, and Trans World Airlines’ Lockheed L-1049-54-80 Super Constellation serial number 4016, Star of the Seine, N6902C, were over the Grand Canyon at 21,000 feet (6,400 meters).

Both airliners had departed Los Angeles International Airport shortly after 9:00 a.m. TWA Flight 2 was headed for Kansas City Municipal Airport with 64 passengers and 6 crew members. United Flight 718 was enroute to Chicago Midway Airport with 53 passengers and 5 crew members.

The airplanes were over the United States desert southwest, which, at that time, was outside of radar-controlled airspace. They were flying around towering cumulus clouds to comply with regulations that they “remain clear of clouds.”

The airplanes collided at about a 25° angle. The accident report describes the impact:

First contact involved the center fin leading edge of the Constellation and the left aileron tip of the DC-7. The lower surface of the DC-7 left wing struck the upper aft fuselage of the L-1049 with disintegrating force. The collision ripped open the fuselage of the Constellation from just forward of its tail to near the main cabin door. The empennage of the L-1049 separated almost immediately. The plane pitched down and fell to the ground. Most of the left outer wing of the DC-7 had separated and aileron control was restricted. . . .

This illustration depicts the collision. (Milford Joseph Hunter/LIFE Magazine)

The Constellation struck the ground near Temple Butte at an estimated 475 miles per hour (765 kilometers per hour). The DC-7’s left wing was so badly damaged that it went into an uncontrolled left spin and crashed at Chuar Butte. All 128 persons on the two airliners were killed.

This, as well as other accidents, resulted in significant changes in the United States air traffic control system.

A Trans World Airlines Lockheed L-1049 Super Constellation, sister ship of Star of the Seine, photographed over the Grand Canyon. (TWA)

© 2018, Bryan R. Swopes