Daily Archives: June 11, 2017

11 June 1971–4 August 1971

Sheila Scott on the wing of her Piper PA-23-250 Aztec D, Mythre, G-AYTO, 1971. (NASA)
Sheila Scott on the wing of her Piper PA-23-250 Aztec D, Mythre, G-AYTO, 1971. (NASA)

11 June 1971: Sheila Scott OBE (née Sheila Christine Hopkins) departed Nairobi, Kenya, on her third solo around-the-world flight. On this flight she used a new airplane, a twin-engine Piper Aztec which she named Mythre. It carried United Kingdom registration G-AYTO. She used a NASA satellite data communication system to constantly relay her position to a NIMBUS satellite, and from there to a ground station at Fairbanks, Alaska.

Sheila Scott's Piper PA-23-250 Aztec D, G-ATYO. Mythre.
Sheila Scott’s Piper PA-23-250 Aztec D, G-ATYO, Mythre, at Kidlington Airport, Oxfordshire, England, 1971. (Tim R. Badham)

On this flight, Sheila Scott planned to not only fly around the world, but to fly from the Equator, over the North Pole, and back to the Equator again. She flew her Aztec from London, England to Nairobi, Kenya, where she began to Equator–North Pole–Equator portion of the flight.

Scott took off from Nairobi on 11 June 1971 and headed northward to Khartoum, Sudan; Bengazi, Libya; Malta; arriving back at London on 21 June. From there she continued to Bodø, Norway; Andøya, Norway; Station Nord, Greenland; across the North Pole on 28 June; then southward to Barrow, Alaska; arriving at Anchorage, Alaska on 3 July; San Francisco, California to Honolulu, Hawaii on 11 July. She recrossed the Equator heading south to Canton Island. On 23 July, Mythre arrived at Nadi, Viti Levu, Fiji, and then flew on to Noumea, New Caledonia. After a stop at Townsville, Scott arrived at Darwin, Australia, 1 August. From there she continued to Singapore; Madras, India; Karachi, Pakistan; Bahrain; Athens, Greece; and finally completed her journey at London on 4 August. Her flight took 55 days.

Sheila Scott set seven Fédération Aéronautique Internationale (FAI) World Records for Speed Over a Recognized Course: Andøya, Norway, to Station Nord, Greenland, 213.61 kilometers per hour (132.73 miles per hour), (FAI Record File Numbers 4622, 4623); Nord to Barrow, Alaska, 183.73 km/h (114.16 mph), (14203); San Francisco, California, to Honolulu, Hawaii, 236.56 km/h (146.99 mph) (4626, 4627); Darwin, Northern Territory, Australia, to London, England, 160.19 km/h (99.54mph) (4624, 4625). Record 4622 is the current record.

The Piper PA-23-250 Aztec D was a six-place twin-engine light airplane based on the earlier PA-23-235 Apache, with a larger cabin and more powerful engines. It was of all-metal construction and had retractable tricycle landing gear. The Aztec D is 30.2 feet (9.205 meters) long with a wingspan of 37 feet (11.278 meters) and overall height of 10.3 feet (3.139 meters). It has an empty weight of 3,042 pounds (1,380 kilograms) and a gross weight of 5,200 pounds (2,359 kilograms).

The Aztec D is powered by two air-cooled, fuel-injected, 541.511-cubic-inch-displacement (8.874 liter) Lycoming IO-540-C4B5 horizontally-opposed 6-cylinder engines. The -C4B5 has a compression ratio of 8.5:1 and is rated at 250 horsepower at 2,575 r.p.m., for takeoff and maximum continuous power. It weighs 374 pounds (170 kilograms). The engines turn two-bladed Hartzell constant-speed propellers through direct drive.

The PA-23-250 has a cruise speed of 206 miles per hour (332 kilometers per hour) at 7,500 feet (2,286 meters) and maximum speed of 216 miles per hour (348 kilometers per hour). The service ceiling was 19,800 feet (6,035 meters). With standard fuel capacity of 144 gallons (545 liters) the airplane’s range was 1,055 miles (1,698 kilometers). Mythre carried an auxiliary fuel tank in the passenger cabin.

After the around-the-world flight, Scott returned Mythre to the Piper Aircraft Company at Lock Haven, Pennsylvania, for overhaul. Following Hurricane Agnes in June 1972, the Piper factory was flooded to a depth of 16 feet (4.9 meters) and Scott’s airplane, along with many others and much of the tooling for aircraft manufacture, was destroyed.

Sheila Scott's Piper Aztec, Mythre, over the North Pole, by Paul Couper, 2008
Sheila Scott over the Top—Piper Aztec, by Paul Couper, Guild of Aviation Artists, 2008. 62 × 52 centimeters, oil/acrylic.

This painting is available from the Guild of Aviation Artists at:

http://www.gava.org.uk/index.php?option=com_phocagallery&searchterm=Paul%20Couper&view=category&id=12&Itemid=534&picsearch=simple

© 2017, Bryan R. Swopes

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11 June 1937

Amelia Earhart’s Lockheed Electra 10E NR16020 in Africa. (Purdue University Libraries, Archives and Special Collections)

11 June 1937: Leg 13. Amelia Earhart and Fred Noonan flew the Lockheed Electra 10E Special, NR16020, from Gao, French Sudan, to Fort-Lamy, French Equatorial Africa, landing at 1:55 p.m. G.M.T.

“As usual, our arising at Gao was before dawn, a start made notable by a marvelous breakfast, whose chief d’oeuvre was a mushroom omelet supplemented with cups of fine French chocolate. Thence our revised route took us to Fort Lamy about a thousand miles away. On this day’s flying to Lamy and the next, we crossed stretches of country barren beyond words, a no-man’s land of eternal want, where the natives cling tenaciously to an existence almost incomprehensible to westerners. . . .”  —Amelia Earhart

© 2016, Bryan R. Swopes

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11 June 1926

Ford Trimotor first flight (RAF Museum)

11 June 1926: The first production Ford 4-AT-A Trimotor, serial number 4-AT-1, flew for the first time at Dearborn, Michigan. It was registered NC2435.

The First Ford Trimotor, 4-AT-1, NC2435. (Detail from photograph below.) (Vintage Air)
The first Ford Trimotor, 4-AT-1, NC2435. (Detail from photograph below.) (Vintage Air)

Designed as a commercial passenger transport, the Ford Trimotor was a high-wing monoplane with fixed landing gear. One engine was mounted at the nose, and two more were suspended under the wings. It had a crew of three and could carry up to eight  passengers in a completely enclosed cabin. The airplane was designed and built by the Stout Metal Airplane Division of the Ford Motor Company, based on its unsuccessful Stout At-3.

A distinctive feature of the Trimotor’s construction was the corrugated metal skin which was used to provide strength and rigidity. (Corrugated skin panels had been used on the Junkers F.13 in 1919.)

Changes to production airplanes came quickly and no two of the early Trimotors were exactly alike.

The Ford 4-AT-A was 49 feet, 10 inches (15.189 meters) long with a wingspan of 74 feet (22.555 meters) and height of 11 feet, 9 inches (3.581 meters). It had an empty weight of 5,937 pounds (2,693 kilograms) and gross weight of 9,300 pounds (4,218 kilograms).

The 4-AT-A was powered by three air-cooled, normally-aspirated 787.26-cubic-inch-displacement (12.90 liter), Wright Aeronautical Corporation Model J-4 Whirlwind 9-cylinder radial engines, producing 215 h.p. at 1,800 r.p.m., each, and turning two-bladed propellers. The J-4 Whirlwind was 34.0 inches (0.864 meters) long, 44.0 inches (1.118 meters) in diameter, and weighed 475 pounds (215 kilograms).

The Trimotor 4-AT-A could cruise at 95 miles per hour (153 kilometers per hour) and it’s maximum speed was 114 miles per hour (184 kilometers per hour). It’s service ceiling was 15,000 feet (4,572 meters) and it had a range of 500 miles (805 kilometers).

This photographg shows four of teh first six Ford Trimotoes at dearborn, Michigan, 27 June 1927. Left to right, 4-AT-3, NC3041, the third built; 4-AT-6, NC2492, the sixth Trimotor; U.S. Navy A-7526, the fourth 4-AT; and 4-AT-1, NC2435, the very first Ford Trimotor built. (Vintage Air)
This photograph shows four of the first six Ford Trimotors at Ford Airport, Dearborn, Michigan, 27 June 1927. Left to right, 4-AT-3, NC3041, the third built; 4-AT-6, NC2492, the sixth Trimotor; U.S. Navy A-7526, the fourth 4-AT; and 4-AT-1, NC2435, the very first Ford Trimotor built. (Vintage Air)

This airplane was very popular at the time and was the foundation for many commercial airlines.  Several were also in military service. Between 1926 and 1933, Ford built 199 Trimotors. Though advances in aeronautics quickly made the Trimotor obsolete, its ruggedness and simplicity kept it in service around the world for decades.

The very first production Ford Trimotor was operated by Ford’s airline, Ford Air Transport Service. It was re-registered NC1492. At 8:45 a.m., 12 May 1928, 4-AT-1 stalled on takeoff at Dearborn. The airliner crashed and caught fire. Pilots William Munn and E.K. Parker were killed.

Ford 4-AT-B, serial number 4-AT-19, registration NC5092, owned by the Standard Oil Company of California. San Diego Air and Space Museum Archives).
Ford 4-AT-B, serial number 4-AT-19, civil registration NC5092, owned by the Standard Oil Company of California. (San Diego Air and Space Museum Archive)

© 2017, Bryan R. Swopes

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