Tag Archives: Air Mail

1 October 1947

A Los Angeles Airways Sikorsky S-51 helicopter takes off from the roof of the Terminal Annex Post Office, 1 October 1947. The Los Angeles Times published this photograph 2 October 1947 with the following caption: “NEW MAIL SERVICE — Los Angeles Airways helicopter shown landing on the roof of Terminal Annex Post office yesterday to inaugurate helicopter air-mail service, the first of its kind in the United States. Two flights daily are planned on this run with another to start Oct. 16.” (Los Angeles Times Photographic Archive/UCLA Library)

1 October 1947: Los Angeles Airways began regularly scheduled air mail service in Los Angeles, using the Sikorsky S-51 helicopter.

“. . . the U.S. Civil Aeronautics Board awarded LAA the route authorities to operate local air mail services in Southern California using the Sikorsky S-51. Before long, LAA was operating a twice-a-day mail service between the main downtown post office and Los Angeles International Airport along with a small package air express service.

“With a fleet of five S-51s, LAA’s first year of operations resulted in 700 tons of mail being carried with approximately 40,000 landings throughout the Los Angeles metropolitan area. The small operation maintained a 95% reliability rate and by the time it began its small package air express service in 1953, it was annually moving nearly 4,000 tons of mail a year.

“In July 1951 the CAB awarded LAA’s reliable helicopter operation the rights for passenger services which started in November 1954 with larger Sikorsky S-55 helicopters while the smaller S-51s continued the mail and small package services. . . .”

Tails Through Timehttp://aviationtrivia.blogspot.com/2010/06/on-1-october-1947-los-angeles-airways.html

The S-51 was a commercial version of the Sikorsky R-5 series of military helicopters. It was a four-place, single-engine helicopter, operated by one pilot. The cabin was built of aluminum with Plexiglas windows. The fuselage was built of plastic-impregnated plywood, and the tail boom was wood monocoque construction. The main rotor consisted of three fully-articulated blades built of metal spars and plywood ribs and covered with two layers of fabric. (All metal blades soon became available.) The three bladed semi-articulated tail rotor was built of laminated wood. The main rotor turned counter-clockwise, as seen from above. (The advancing blade is on the helicopter’s right.) The tail rotor was mounted on the helicopter’s left side in a pusher configuration. It turned clockwise as seen from the helicopter’s left.

The helicopter’s fuselage was 41 feet, 7.5 inches (12.687 meters) long. The main rotor had a diameter of 48 feet (14.630 meters) and tail rotor diameter was 8 feet, 5 inches (2.565 meters), giving the helicopter an overall length of 57 feet, 1 inch (17.399 meters). It was 13 feet, 1.5 inches (4.001 meters) high. The landing gear tread was 12 feet (3.7 meters). The S-51 had an empty weight of 4,050 pounds (1,837 kilograms) and maximum takeoff weight of 5,500 pounds (2,495 kilograms). Fuel capacity was 100 gallons (378.5 liters).

The helicopter was powered by an air-cooled, supercharged, 986.749-cubic-inch-displacement (16.170 liter) Pratt & Whitney Wasp Jr. T1B4 (R-985 AN-5) direct-drive, nine-cylinder radial engine which was placed vertically in the fuselage behind the crew compartment. This engine was rated at 450 horsepower at 2,300 r.p.m., Standard Day at Sea Level. The R-985 AN-5 was 48.00 inches (1.219 meters) long, 46.25 inches (1.175 meters) in diameter and weighed 684 pounds (310.3 kilograms) with a magnesium crankcase.

The S-51 had a maximum speed (Vne) of 107 knots (123.1 miles per hour/198.2 kilometers per hour). Range was 275 miles (442.6 kilometers). The service ceiling was 14,800 feet (4,511 meters). The absolute hover ceiling was 3,000 feet (914.4 meters).

Of 220 helicopters in the S-51 series built by Sikorsky, 55 were commercial models.

Los Angeles Airways Sikorsky S-51 (Viewliner)
A Los Angeles Airways Sikorsky S-51. The main rotor hub is covered. (Viewliner)

© 2016, Bryan R. Swopes

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11 September 1920

Edison E. (“Monte”) Mouton (left) and fellow Air Mail pilot Rexford Levisee, with DH-4 at Reno, Nevada, ca. 1921. (Schoettner Foto., Reno, Nev./National Postal Museum, Curatorial Photo Collection)

11 September 1920: At 2:33 p.m., Edison E. (“Monte”) Mouton landed at Marina Field near The Presidio of San Francisco, completing the final leg of the first transcontinental air mail flight by the U.S. Postal Service. Airplane No. 151 carried 6 sacks of First Class mail from Mineola, New York.

Mouton, a pilot assigned to Salt Lake City, taking over the flight for another pilot, flew No. 151 from Reno, Nevada, to San Francisco, California, a distance of 250 miles (402 kilometers), in 1 hour, 58 minutes.

The mail sacks were immediately taken from the airplane to the central post office, where they were distributed. Two of the mail sacks were sent to Washington State and one sack to Oregon on the 4 o’clock train.

The entire cross-country flight had taken 75 hours.

Edison Esadore Mouton was born in California, 10 December 1894, the first of three children of Edward E. Mouton, a farmer, and Gertrude F. Winters Mouton.

Monte Mouton, then living in Carson City, Nevada, enlisted in the U.S. Army when the United States entered World War I. He served as a pilot with the Lafayette Escadrille in France during World War I, and was commissioned a second lieutenant, Air Service, American Expeditionary Forces. He rose to the temporary rank of colonel. Lieutenant Mouton was honorably discharged 14 May 1919. He was later an officer in the Air Corps Reserve, holding the rank of major.

Mouton was employed by the United States Aerial Mail Service from 8 September 1920 to 22 May 1927. During that time, Edison flew 3,804.54 hours and covered 369,730 miles (595,023 kilometers), flying the mail. He then became a supervising inspector for the Department of Commerce, serving for six years before resigning to enter private industry. Mouton was vice president and general manager of Nevada Air Transport, Inc., a regional airline serving the state of Nevada.

Edison E. Mouton married Miss Claire Yerington, 27 April 1921, at Reno, Nevada. (“Yerington,” as in, Yerington, Nevada. Miss Yerington’s grandfather was the superintendent of the Virginia and Truckee Railroad, which serviced the “Comstock Lode” silver mines.) Miss Yerington was described as “a strikingly beautiful blonde,” and “an intrepid devotee of the air and knows the intricacies of an automobile as well as any mechanician.” They divorced in November 1928 but were remarried 20 March 1929. They had two children.

Edison Esadore Mouton died at San Francisco Airport, San Francisco, California, 5 July 1940, an apparent suicide. He is buried at the San Francisco National Cemetery, San Francisco, California.

© 2017, Bryan R. Swopes

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7 August 1919

Captain Hoy’s JN-4 Canuck at Minoru Park, Richmond, B.C., prior to departing on his historic flight across the Canadian Rockies, 7 August 1919. (Unattributed)

7 August 1919: Captain Ernest Charles Hoy, DFC, a World War I fighter pilot credited with 13 aerial victories, became the first pilot to fly across the Canadian Rockies when he flew from Richmond, British Columbia, to Calgary, Alberta, carrying the mail for the Post Office Department.

Foy’s airplane was a single-engine Canadian Aeroplanes Ltd.-built JN-4 “Canuck” two-bay biplane, an independent derivative of the Curtiss Aeroplane and Motor Company JN-3 “Jenny,” to the specifications of the Royal Flying Corps. The Canuck had ailerons on upper and lower wings, giving it better roll response than the original Curtiss JN-4. The Canuck was 27 feet, 2½ inches (8.293 meters) long, with an upper wingspan of 43 feet, 7-3/8 inches (13.294 meters) and lower span of 34 feet, 8 inches ( meters). The height was 9 feet, 11 inches (3.023 meters). The empty weight was 1,390 pounds (630 kilograms) and gross weight was 1,930 pounds (875 kilograms).

The Canuck was powered by a water-cooled, normally-aspirated 502.655-cubic-inch-displacement (8.237 liters) Curtiss Aeroplane and Motor Company OX-5 90° V-8 engine with a compression ratio of 4.9:1. This was a direct-drive engine which produced 90 horsepower at 1,400 r.p.m. and turned a two-bladed, fixed-pitch propeller. The OX-5 was 4 feet, 8.75 inches (1.442 meters) long, 2 feet, 5.75 inches (0.756 meters) wide and 3 feet, 0.75 inches (0.932 meters) high. It weighed 390 pounds (177 kilograms).

The Canuck had a cruise speed of 60 miles per hour (97 kilometers per hour) and maximum speed of 74 miles per hour (119 kilometers per hour). Its service ceiling was 11,000 feet (3,353 meters). The standard airplane had a range of 155 miles (249 kilometers). Captain Hoy had an additional 12 gallon (45 liters) fuel tank installed in the airplane’s forward cockpit.

Two Canadian newspapers had agreed to offer a cash prize to the first person to make this flight. Captain Hoy was sponsored by the Aerial League of Canada, which purchased the airplane. Supposedly, Hoy was selected to make the flight by winning a coin toss with another pilot.

Captain Hoy took off from Minoru Park in Richmond at 4:13 a.m., carrying 45 specially marked letters and several special editions of the Vancouver Daily World. He made several fuel stops enroute, flew through several mountain passes and finally landed at Bowness Park in Calgary at 8:55 p.m. His flight took 16 hours, 42 minutes.

Captain Ernest C. Hoy, DFC, hands over the Mail at Calgary, Alberta, 7 August 1919. (Unattributed)

Ernest Charles Hoy was born at Dauphin, Manitoba, 6 May 1895, the son of Charles and Eliza Lavinia Kitchener Hoy.

Ernest Charles Hoy was 5 feet, 9½ inches (1.765 meters) tall, and weighed 165 pounds (75 kilograms). He had black hair and brown eyes. Hoy enlisted as a private in the 102nd Battalion, Canadian Expeditionary Force, 3 March 1915. The unit arrived in France, 12 August 1916, and fought as part of the 11th Infantry Brigade, 4th Canadian Division. He was transferred to the 3rd Pioneer Battalion, Canadian Engineers. After contracting a serious illness, Private Hoy was sent back to England to recuperate. While there, he volunteered for the Royal Flying Corps. He was trained as a pilot and assigned to No. 29 Squadron.

Royal Aircraft Factory S.E.5a D6940 of No. 29 Squadron, Royal Flying Corps, photographed by Flight Lieutenant B.G. Mayner. © Imperial War Museum (Q 69781)

Between 12 August and 27 September 1918, Lieutenant Hoy shot down 13 enemy aircraft (including two balloons) with his Royal Aircraft Factory S.E.5a fighter. After his fourth, Hoy was recommended for the Distinguished Flying Cross. His citation in The London Gazette reads,

Lieut. (A/Capt.) Ernest Charles Hoy.                                                                                                                                    (FRANCE)
     A bold and skillful airman who has accounted for four enemy machines and shot down a balloon in flames, displaying at all times a fine fighting spirit, disregarding adverse odds.

The London Gazette, 3 December 1918, Supplement 31046, Page 14322 at Column 2.

On 26 September 1918, Captain Hoy was shot down by an enemy pilot. He was captured and held as a prisoner of war until the Armistice.

Ernest Charles Hoy, 1939

On 12 July 1922, Captain Hoy married Miss Marjorie Day at Vancouver, British Columbia. They emigrated to the United States in 1924 and resided in Newark, New Jersey. They had two children, Ross Kitchener Hoy, born in 1926, and Jane Elizabeth Hoy, born in 1930.

Captain Hoy became a naturalized citizen of the United States of America on 6 July 1939. He worked as a branch manager for an insurance company.

Captain Ernest Charles Hoy died at Toccoa, Georgia, 22 April 1982, just short of his 87th birthday.

© 2017, Bryan R. Swopes

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15 May 1918

Curtiss JN-4HM “Jenny), S.C. 38262, at Potomac Park Polo Field, Washington, D.C., 15 May 1918 (National Postal Museum, Smithsonian Institution)

15 May 1918: The United States Post Office Department began regularly-scheduled transportation of the mail by air. After a short delay the first flight departed from Potomac Park Polo Field, near Washington, D.C., at approximately 11:45 a.m., heading to Philadelphia, Pennsylvania, on the first leg of a relay to New York City, New York. Among many spectators and government officials, there to observe was Thomas Woodrow Wilson, the 28th President of the United States of America.

Potomac Park Polo Field

The weather was described as “fair,” with the air temperature at 70 °F. (21 °C.). The first airplane scheduled to depart was a Curtiss JN-4HM “Jenny,” Signal Corps serial number S.C. 38262. Its pilot was Second Lieutenant George Leroy Boyle, Aviation Section, Signal Officer’s Reserve Corps, United States Army.

S.C. 38262 was a brand new airplane. It had been shipped by railroad from the Curtiss Aeroplane and Motor Company’s plant in Hammondsport, New York, to Hazelhurst Field,¹ Long Island, New York. The airplane was uncrated and assembled, then flown to Bustleton Field, about 15 miles (24 kilometers) from down town Philadelphia.

Major Reuben H. Fleet, at left, with 2nd Lieutenant George Leroy Boyle, at Potomac Park Polo Field, the morning of 15 May 1918. (National Postal Museum, Smithsonian Institution )

On the morning of 15 May, Major Reuben H. Fleet flew S.C. 38262 to Washington, D.C., arriving there at 10:35 a.m. Major Fleet met with Lieutenant Boyle to discuss the actual mail flight and assist him with charts for the route. With all the hurried activity, refueling the Jenny was overlooked. When it was time, Boyle was unable to start the airplane’s engine. There was no gasoline available at the polo fields, so some was siphoned from the other airplanes.

Lieutenant Boyle was finally airborne at approximately 11:45 with his load of U.S. Mail.

2nd Lieutenant George Leroy Boyle takes off in Curtiss JN-4HM S.C. 38262, at approximately 11:45 a.m., 15 May 1918. (Smithsonian Institution SI 2000-6150)

After taking off, though, Lieutenant Boyle turned toward the south—the wrong direction for Philadelphia.

Boyle soon realized that something was wrong and he landed to try to orient himself. he took off again, but once again recognized that he was lost and landed again, this time, near Waldorf, Maryland. Landing in a soft field, S.C. 38262 nosed over and the propeller was damaged.

Coincidentally, a house near Boyle’s landing site was the home of Assistant Postmaster General Otto Praeger, about 20 miles (32 kilometers) from Washington. Boyle was able to call Washington and report in. He and the mail were driven back to Potomac Park.

Major Fleet wanted to replace Boyle, but was overruled by Post Office officials.

Lieutenant Brady’s flight report, Form 220B, 15 May 1918. (National Archives and Records Administration, via Tim Brady, Embry-Riddle Aeronautical University)
Reverse of (National Archives and Records Administration, via Tim Brady, Embry-Riddle Aeronautical University)

S.C. 38262 was repaired, and on 17 May, Lieutenant Boyle and his load of mail, all of which had been stamped to indicate the first day of air mail service, once again took off on schedule at 11:35 a.m., for Philadelphia. This time, though, Boyle was escorted as far as Baltimore, Maryland, by another pilot. (Sources vary. Some say it was Major Fleet, while others say it was Lieutenant James Edgerton, flying S.C. 38274.) From that point, Boyle had been told, he was to simply follow the shoreline of Chesapeake Bay to Philadelphia.

But, once again, Lieutenant Boyle turned the wrong way. At about 2:45 p.m., low on fuel, he landed near Cape Charles, Virginia, about 125 miles (201 kilometers) to the south of Washington, D.C. Boyle was able to borrow gasoline from a farmer and at 4:15 p.m., was airborne once again.

Darkness approached and Boyle’s fuel was running low. Uncertain of his position, at 7:05 p.m., he landed at the Philadelphia Country Club, which was about 15 miles (24 kilometers) short of his actual destination at Bustelton Field. The airplane struck an obstacle and Lieutenant Boyle was thrown from the cockpit, though he suffered only minor injuries. The Jenny, though, was in worse shape. Its left lower wing was torn off, and its upper wing damaged. The airplane would be repaired, but did not return to service until 10 July 1918.

A member of the club drove Boyle and his load of mail to Bustleton Field, where it was loaded on a train for New York City.

Postal Department officials wanted Lieutenant Boyle to continue flying the mail, but Major Fleet refused. This time, rather than being overruled, he was supported in his decision by Secretary of War Newton Diehl Baker Jr.

Curtiss JN-4HMs S.C.38274 and S.C. 38262 at Potomac Park Polo Field. (Benjamin Lipsner Collection, National Postal Museum, Smithsonian Institution A.2006-12)

On 1 March 1918, the U.S. Postal Department and the United States Army agreed that the Army would fly the mail, beginning 15 May 1918. Major Reuben Hollis Fleet, Aviation Section, Signal Corps, was placed in charge of the project by Secretary of War Baker. The Signal Corps ordered 18 airplanes for the purpose: six Curtiss Aeroplane and Motor Co, JN-4HTs, serial numbers S.C. 37944, 38262, 38274, 38275, 38276, 37278; six Liberty-powered Curtiss R-4Ls, S.C. 39362–39367; and six JR-1Bs, serial numbers 1–6, from the Standard Aircraft Corporation, Plainfield, New Jersey. Fleet told Curtiss to modify the Jennys by removing the seat and flight controls from the forward cockpit, and to add a hopper to hold the mail. The airplanes were also given increased fuel and lubricating oil capacity. The airplanes were redesignated JN-4HM.

Major Fleet was told to select four pilots, while the Post Office Department would choose another two. He chose 1st Lieutenants Howard Paul Culver, Walter Miller and Torrey H. Webb, and 2nd Lieutenant Stephen Bonsal, Jr.

2nd Lieutenant James C. Edgerton, Aviation Section, Signal Corps, United States Army.

The two Army pilots chosen by the Post Office were 2nd Lieutenant George L. Boyle and 2nd Lieutenant James C. Edgerton. These two officers had just completed flight training and had only about 60 hours flight time, each.

But George Boyle was engaged to Miss Margaret Grundy McChord, the daughter of Judge Charles Caldwell McChord, Chairman of the Interstate Commerce Commission. Lieutenant Edgerton was the son of James A. Edgerton, the purchasing agent of the Post Office.

Not much is known about George Leroy Boyle. He was born at Fort Scott, Kansas, during October 1891. He was the first of four children of Louis C. Boyle, a lawyer who had been born in Canada, and Gertrude Boyle, of Illinois. George had three younger sisters,  Catherine G., Clara L., and Gertrude Boyle.

Boyle may have studied at the University of Missouri, Columbia, in 1912, and/or the Kansas City School of Law, Kansas City Missouri, as a member of the Class of 1915.

Boyle is believed to have attended ground school at Princeton University, Princeton, New Jersey, from 17 November 1917 to 26 January 1918. He was commissioned as a second lieutenant in the Aviation Section, Signal Corps, United States Army, and ordered to report to Park Field at Millington, Tennessee, for primary flight training. He then completed advanced flight training at Ellington Field, Houston, Texas.

Ellington Field, near Houston, Texas, 1918. (Signal Corps, United States Army)

One month following his unfortunate beginning as an air mail pilot, George Leroy Boyle married Miss McChord. The ceremony was held at 5:00 p.m., 15 June 1918, in the Red Parlor of the New Willard Hotel, a luxurious Beaux-Arts-style hotel near the center of Washington, D.C. The wedding, “One of the most notable of the June weddings in the capital,” was officiated by Rev. Walter Everett Burnett.

Lieutenant Boyle’s military career seems to have come to an end at about this time. In 1920, he and Mrs. Boyle (along with her father, Judge McChord) were residents at the Willard, and Boyle was a practicing attorney.

Mrs. Boyle gave birth to a daughter, Josephine Fairchild Boyle, in Washington, D.C., 15 April 1921.

By 1924, the Boyles were living apart. George Boyle was practicing law in Kansas City, Missouri, while Mrs. Boyle and her daughter remained in Washington, D.C.

Nothing else seems to be known about George Leroy Boyle.

Major Fleet and Lt. Boyle with S.C. 38262, at Potomac Park polo Field, 15 May 1918. The woman in the photograph may be Miss Margaret McChord, Lieutenant Boyle’s fiancée. (National Postal Museum, Smithsonian Institution)

There is another interesting story associated with George Boyle and the First Day of U.S. Air Mail service.

The Post Office Department issued a new 24-cent postage stamp for air mail. The stamp was issued on 10 May 1918. Due to an error in printing, the blue portion of the image, the airplane was printed inverted in reference to the red portion. Only about 100 stamps are known to have been printed this way. Known as the “Inverted Jenny,” this is one of the most famous and valuable postage stamp errors known.

The airplane on the stamp, a Curtiss Jenny, is marked with the serial number 38262—Lieutenant Boyle’s airplane.

An example of this stamp sold at auction in 2016 for $1,351,250 (including buyer’s premium).

“The Inverted Jenny” 24¢ postage stamp, issued 10 May 1918. (U.S. Postal Service)

The Curtiss JN-4 “Jenny” was a single-engine, two place, two-bay biplane, designed and built by the Curtiss Aeroplane and Motor Company, Hammondsport, New York, and used primarily as a training aircraft. It was also produced by five other manufacturers under license: the Fowler-Howell & Lesser Co., San Francisco, California; Liberty Iron Works, Sacramento, California; Springfield Aircraft Corporation, Springfield, Massachusetts;  St. Louis Aircraft Corporation, St. Louis, Missouri; and the U.S. Aircraft Corporation.

Side elevation erection drawing of the Curtiss JN-4D Jenny, 1917. (rcgroups.net)

The JN-4 was 27 feet, 4 inches (8.306 meters) long, with an upper wing span of 43 feet, 7-3/8 inches (13.294 meters) and lower span of 33 feet, 11¼ inches (10.344 meters). The height of the airplane in flight attitude was 9 feet, 10-5/8 inches (3.013 meters). The JN-4H variant had an empty weight of 1,625 pounds (737 kilograms), and gross weight of 2,269 pounds (1,029 kilograms).

Front elevation erection drawing of the Curtiss JN-4D Jenny, 1917. (Smithsonian Institution, National Air and Space Museum, NASM-NAM-A-42215-C)

The wings had a chord of 4 feet, 11½ inches (1.551 meters), and vertical gap of 5 feet, 1¼ inches (1.556 meters). The lower wing was staggered 1 foot, 4 inches (0.406 meters) behind the upper. The wings had 2º angle of incidence and 1° dihedral. There was no sweep. The ailerons were on the upper wing. The total wing area was 353.06 square feet (32.80 square meters).

While the most common variant of the JN-4, the JN-4D, was equipped with the Curtiss OX-5 engine, the JN-4H was powered by a Wright-Hispano, or more commonly, the “Wright-Hisso,” a design licensed by the Wright-Martin Aircraft Corporation, New Brunswick, New Jersey, from the Société Française Hispano-Suiza. Many sources state that the engine of the JN-4H was a Wright-Hisso E, but almost universally, they indicate that it was rated at 150 horsepower. The Model E, however, was rated at 180 horsepower, while the 150 horsepower engine is identified as the Model A. There was also an improved 150-horsepower Model I. Wright-Martin began producing the Model E in September 1916, All three of these engines are very similar. It is uncertain which model was actually installed in the JN-4HM mail planes.

Wright-Martin Model E SOHC V-8 aircraft engine, licensed version of the Société Française Hispano-Suiza V-8, in the collection of the Smithsonian Institution, National Air and Space Museum. (NASM 2014-04437)

The Wright-Hispano Models A, E and I were liquid-cooled, normally-aspirated, 717.629-cubic-inch-displacement (11.760 liter) single overhead camshaft (SOHC) 90° V-8 engines. All were direct drive.  The A and I variants had a compression ratio of 4.72:1, while the Model E ratio was 5.33:1. The Model E was designed to operate 300 r.p.m. faster than the A or I, and was strengthened for the higher loads. The Models A and I were rated at 150 horsepower at 1,540 r.p.m. at Sea Level. The Model E produced 185 horsepower at 1,750 r.p.m., and 195 horsepower at 1,850 r.p.m. The dry weight of the Model E was 470 pounds (213 kilograms).

The Curtiss JN-4HM had a cruise speed of 75 miles per hour (121 kilometers per hour) and maximum speed of 91 miles per hour (146 kilometers per hour). Its service ceiling was 7,500 feet (2,286 meters) and the airplane’s range was 155 miles (249 kilometers).

A Curtiss JN-4D in the collection of the Smithsonian Institution, National Air and Space Museum. (NASM SI-2007-13553)

¹ On 15 July 1918, Hazelhurst Field was renamed Mitchel Field in honor of James Purroy Mitchel, mayor of New York City, 1914–1917. The name change was officially approved in April 1919. James Mitchel had joined the Aviation Section, Signal Corps. on 6 July 1918, he was killed when he fell from an airplane near Gerstner Field, Louisiana.

© 2019, Bryan R. Swopes

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28 April 1937

Pan American Airways' Martin M-130, China Clipper, at Macau, 1937.
Pan American Airways’ Martin M-130, China Clipper, at Macau, 1937.

28 April 1937: The first transpacific flight by a commercial passenger airliner is completed when Pan American Airways’ Martin M-130, China Clipper, arrived at Hong Kong. The flight had departed San Francisco Bay, California, on 21 April with 7 revenue passengers and then proceeded across the Pacific Ocean by way of Hawaii, Midway Island, Wake Island, Guam, Manila, Macau, and finally Hong Kong. The Reuters news agency briefly reported the event:

AIR LINK AROUND WORLD FORGED.

China Clipper Lands At Hong Kong.

Hong Kong, April 28.

The Pan-American Airways flying boat China Clipper landed at 11:55 this morning from Manila and Macao. This links the Pan-American and Imperial Airways, completing the commercial air link round the world. —Reuter.

The Straits Times, 28 April 1937, Page 1, Column 4.

Pan American Airways' China Clipper, a Martin M-130, NC14716, over San Francisco, California.
Pan American Airways’ China Clipper, a Martin M-130, NC14716, over Oakland, California. (Unattributed)

The China Clipper, NC14716, was the first of three Martin M-130 four-engine flying boats built for Pan American Airways and was used to inaugurate the first commercial transpacific air service from San Francisco to Manila in November, 1935. Built at a cost of $417,000 by the Glenn L. Martin Company in Baltimore, Maryland, it first flew on 20 December 1934, and was delivered to Pan Am on October 9, 1935.

The airplane was operated by a flight crew of 6 to 9, depending on the length of the flight, plus cabin staff, and could carry 18 passengers on overnight flights or a maximum 36 passengers.

Martin M-130 China Clipper, NC14716, at Honolulu, Ohau, Hawaiian Islands. (Unattributed)
Martin M-130 China Clipper, NC14716, at Honolulu, Oahu, Hawaiian Islands. (Unattributed)

The Martin M-130 was 90 feet, 10.5 inches (27.699 meters) long with a wingspan of 130 feet, 0 inches (39.624 meters). It was 24 feet, 7 inches (7.493 meters) high. Its maximum takeoff weight was 52,252 pounds (23,701 kilograms).

The flying boat was powered by four air-cooled, supercharged, 1,829.389-cubic-inch displacement (29.978 liters) Pratt & Whitney Twin Wasp S2A5-G engines. These were two-row, 14-cylinder radial engines with a compression ratio of 6.7:1. The S2A5-G was rated at 830 horsepower at 2,400 r.p.m., and 950 horsepower at 2,550 r.p.m. for takeoff, burning 87-octane gasoline. They drove three-bladed Hamilton Standard Hydromatic constant-speed propellers through a 3:2 gear reduction. The engine was 3 feet, 11.88 inches (1.216 meters) in diameter and 4 feet, 8.75 inches (1.441 meters) long. It weighed 1,235 pounds (560 kilograms).

The airplane had a maximum speed of 180 miles per hour (290 kilometers per hour), and a cruise speed of 130 miles per hour (209 kilometers per hour). The service ceiling was 10,000 feet (3,048 meters) and its range was 3,200 miles (5,150 kilometers).

Martin M-130, NC14716, China Clipper, moored at some distant exotic locale.
Martin M-130, NC14716, China Clipper, moored at some distant exotic locale. (Unattributed)

© 2019, Bryan R. Swopes

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