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