Category Archives: Aviation

26–29 July 1937

July 26, 2024AviationBeech Aircraft Corporation, Beech Staggerwing, Beechcraft D17R, Beechcraft D17S, Beechcraft D17W, Bu. No. 09776, c/n 136, GB-1 Traveler, Jackie Cochran, Jacqueline Cochran, NC17081, NX17081, Pratt & Whitney R-985-AN-1, Pratt & Whitney Wasp Jr. SC-G, s/n 531, Speed Record, The Stars at Noon, United States National Record for Speed Over a Closed Circuit of 1000 Kilometers, Woman's Speed Record, Wright Whirlwind R-975Bryan Swopes

Beechcraft D17W “Staggerwing”, NC17081. (Westin’sClassic General Aviation Aircraft)

26 July 1937: Jackie Cochran set a United States Women’s National Speed Record ¹ of 203.895 miles per hour (328.137 kilometers per hour) over a 1,000 kilometer (621.4 mile) course between the Union Air Terminal at Burbank, California, and San Francisco’s Golden Gate Bridge, and return, flying a Beechcraft D17W “Staggerwing,” NC17081, serial number 136. ²

A woman in the air, therefore, had a choice of flying around in a light plane for pleasure or of obtaining for herself new fast and experimental equipment and determining the maximum that could be obtained from its use. I followed the second course. The objective of each flight was to go faster through the atmosphere or higher into it than anyone else and to bring back some new information about plane, engine, fuel, instruments, air or pilot that would be helpful in the conquest of the atmosphere.

—The Stars at Noon, by Jacqueline Cochran, Little, Brown and Company, Boston, 1954, Chapter IV at Page 58

The Oakland Tribune reported:

WOMAN MAKES SPEED FLIGHT

Coast Record May have been Set on Oakland-L.A. Hop

Jacqueline Cochrane [sic] Odlum, wife of a wealthy New York investment broker, today claimed a non-stop speed record for women fliers between Los Angeles and Oakland.

The 27-year-old aviatrix made the round trip between Union Air terminal and Oakland yesterday in 3 hours 2 minutes and 51 seconds, averaging 203.89 miles per hour.

While no official record now exists for a women’s flight over the 621.37 mile distance, Mrs. Odlum said she will seek recognition of her mark by the National Aeronautic Association and the Federation Aeronautique Internationale.

Mrs. Odlum probably will enter her cabin racing plane, equipped with a 600-horsepower engine, in the Bendix races in September. She has been in the Bendix races before, and, in 1934, was in the London-to-Australia air derby but abandoned her hop in Bucharest.

Floyd Odlum, to whom the aviatrix was married last year, is eminent in the world of finance and is known as the man who built the Atlas Corporation into one of the most successful investment trusts.

—Oakland Tribune, Vol. CXXVII, No. 27, Tuesday, 27 July 1937, Page 1, Column 3

On 29 July, the International News Service reported:

199 M.P.H. RECORD SET BY AVIATRIX

Jacqueline Odlum Establishes Second Flying Mark

BURBANK, Calif., July 29—(I.N.S.)—Another women’s flying record—her second in a week—was hung up by Jacqueline Cochran Odlum, pretty aviatrix, timekeepers at the Los Angeles airport here announced today.

Mrs. Odlum flew to Garden Grove, Cal., and back to set a new 100-kilometer speed record for women of 199 miles an hour. The previous record was held by Mrs. Louise Thaden, who did it at 196 miles and hour.

A week ago [sic] Mrs. Odlum flew to San Francisco and back at 203.89 miles an hour to set an average speed record for 1,000 kilometers.

—Lancaster New Era, Lancaster, Pennsylvania, Thursday, 29 July 1937Page 15, Column 7

Beechcraft D17W Staggerwing, NC17081, c/n 136, National Speed Record holder, 203.895 mph (328.137 kph). This airplane is painted "Merrimac Diana Cream" with "Stearman Vermillion" striping outlined in black. (Beech Aircraft Corporation) — Beechcraft D17W Staggerwing, NC17081, c/n 136. This airplane is painted “Merrimac Diana Cream” with “Stearman Vermillion” striping outlined in black. (Beech Aircraft Corporation via www.beech17.net)

NC17081 was one of two special D17W biplanes that were built by the Beech Aircraft Corporation, based on the production D17S “Staggerwing.” Jackie Cochran set aviation records with both of the D17Ws. The first, c/n 136, was originally sold to famous aviator Frank Monroe Hawks, but that purchase was not completed. Cochran was given the use of the airplane by the Beechcraft.

The Beechcraft Model 17 was single-engine, single-bay biplane operated by a single pilot, and which could carry up to three passengers in an enclosed cabin. The airplane got its nickname, “Staggerwing,” from the lower wing being placed forward of the upper wing for improved pilot visibility. The airplane’s basic structure was a welded tubular steel framework with wood formers and stringers. The wings and tail surfaces were built of wood spars and ribs, with the leading edges and wing tips covered with plywood. The airplane was covered with doped fabric, except the cabin and engine which were covered in sheet metal. It was equipped with electrically-operated retractable landing gear and wing flaps.

Beech Aircraft Corporation Model 17 “Staggerwings” under construction. (Beech B-111/U.S. Air Force)

The D17-series differed from earlier Beech Model 17 variants by having the fuselage lengthened to improve elevator effectiveness, and the ailerons were on the upper wing.

The D17S was 26 feet, 10.7 inches (8.197 meters) long with a wingspan of 32 feet, 0 inches (9.754 meters) and overall height of 10 feet, 3 inches (3.124 meters). It had an empty weight of 2,540 pounds (1,152 kilograms) and gross weight of 4,250 pounds (1,928 kilograms).

While most biplanes had staggered wings, the Staggerwing was unusual in having negative stagger. This not only increased the pilot’s field of vision, but improved the airplane’s stability in a stall. The leading edge of the Model 17 upper wing was 2 feet, 1–19/32 inches (0.65008 meters) aft of the lower wing. The leading edges had 0° 0′ sweep. Both wings had an angle of incidence of 5° 5′. The upper wing had no dihedral, but the lower wing had +1°. The mean vertical gap between the wings was 5 feet (1.52 meters), and the chord of both wings was 5 feet, 0 inches (1.524 meters). The total wing area was 269.5 square feet (25.04 square meters). The horizontal stabilizer had 0° incidence, while the vertical fin was offset 0° 43′ to the left of the airplane’s centerline.

The Beechcraft D17S was powered by an air-cooled, supercharged 986.749-cubic-inch-displacement (16.170 liter) Pratt & Whitney R-985-AN-1,² a single-row 9-cylinder direct-drive radial engine with a compression ratio of 6:1. This engine was rated at 400 horsepower at 2,200 r.p.m., at 5,000 feet (1,524 meters), maximum continuous power, and 450 horsepower at 2,300 r.p.m. for take off, using 91-octane gasoline. The R-985-AN-1 was 3 feet, 7.05 inches (1.093 meters) long, 3 feet, 10.25 inches (1.175 meters) in diameter and weighed 682 pounds (309 kilograms) when constructed of aluminum, or 674 pounds (306 kilograms), built of magnesium. The engine drove a Hamilton Standard propeller with a diameter 8 feet, 3 inches (2.515 meters).

The production D17S Staggerwing had a cruise speed of 202 miles per hour (325 kilometers per hour) and maximum speed of 212 miles per hour (341 kilometers per hour). The service ceiling was 23,000 feet (7,010 meters) and range was 840 miles (1,352 kilometers).

Frank Monroe Hawks, 1932 (Edward Steichen)

Beechcraft D17W NX17081 was built for Frank Hawks with an air-cooled, supercharged, 986.749 cubic-inch-displacement (16.170 liter) Pratt & Whitney Wasp Jr. SC-G single-row nine-cylinder radial engine with a compression ratio of 6.7:1. (Engine serial number 531.) This was the only geared variant of the Wasp Jr., and had a reduction ratio of 3:2. This engine was rated at 525 horsepower at 2,700 horsepower up to an altitude of 9,500 feet (2,896 meters) with 87-octane gasoline, and 600 horsepower at 2,850 r.p.m. for takeoff (when using 100-octane aviation gasoline). The additional 150 horsepower greatly increased the D17W’s performance over the standard production airplane. The Wasp Jr. SC-G was 3 feet, 10.469 inches (1.180 meters) long, 3 feet, 10.75 inches (1.187 meters) in diameter and weighed 864 pounds (392 kilograms).

After Jackie Cochran’s speed record, c/n 136 was registered NC17081, re-engined with a 971.930 cubic inch (15.927 liters), 420 horsepower Wright Whirlwind R-975 and re-designated D17R. After changing ownership several times, the Wright engine was replaced with a Pratt & Whitney R-985 and once again re-designated, this time as a D17S.

Early in World War II, the former speed record holder was impressed into military service. It was registered to the Defense Supplies Corporation, Washington, D.C., 14 April 1942, but the registration was cancelled four months later, 11 August 1942. Assigned to the United States Navy, c/n 136 was once again re-designated, this time as a GB-1 Traveler, and assigned Bureau of Aeronautics serial number (“Bu. No.”) 09776.

Beechcraft GB-1 Traveler Bu. No. 09776 was stricken off at NAS Glenview, Illinois, 30 June 1945.

Beechcraft GB-1 Traveller in U.S. Navy service. (U.S. Air Force) — A Beechcraft GB-1 Traveler in U.S. Navy service. (U.S. Air Force)

¹ A check with the National Aeronautics Association this afternoon (25 February 2016) was unable to verify this record. —TDiA

² This is a different engine than the R-985-1, which was military variant of the 300-horsepower Pratt & Whitney Wasp Jr. A.

A row of eleven U.S. Navy Beech GB-1 Travelers. (U.S. Air Force)

25 July 2000

July 25, 2024AviationAérospatiale-BAC Concorde, Air France Flight 4590, F-BTSC, Rolls-Royce/SNECMA Olympus 593 Mk.610, s/n 103Bryan Swopes

“Air France Flight 4590 taking off with fire trailing from its engine, Paris, July 25, 2000.” (Toshihiko Sato/AP Images)

25 July 2000: On Tuesday afternoon at 14:42 UTC (16:42 local time), Air France Flight 4590, an Aérospatiale-BAC Concorde, F-BTSC, began its takeoff from Paris Charles de Gaulle on a chartered flight to New York City. The airliner had a flight crew of three and cabin crew of six. There were 100 passengers on board.

During takeoff from runway 26 right at Roissy Charles de Gaulle Airport, shortly before rotation, the front right tyre of the left landing gear was damaged and pieces of the tyre were thrown against the aircraft structure. A major fire broke out under the left wing. Problems appeared shortly afterwards on engine N° 2 and for a brief period on engine N° 1. The aircraft was neither able to climb nor accelerate. The crew found that the landing gear would not retract. The aircraft maintained a speed of 200 kt and a radio altitude of 200 feet for about one minute. Engine n° 1 then stopped. The aircraft crashed onto a hotel at La Patte d¹Oie in Gonesse.

—English translation, Summary, Preliminary Accident Report, Bureau Enquêtes-Accidents

The final report stated:

3.2 Probable Causes

The accident was due to the following causes:

• High-speed passage of a tyre over a part lost by an aircraft that had taken off five
minutes earlier and the destruction of the tyre.

• The ripping out of a large piece of tank in a complex process of transmission of the
energy produced by the impact of a piece of tyre at another point on the tank, this
transmission associating deformation of the tank skin and the movement of the
fuel, with perhaps the contributory effect of other more minor shocks and /or a
hydrodynamic pressure surge.

• Ignition of the leaking fuel by an electric arc in the landing gear bay or through
contact with the hot parts of the engine with forward propagation of the flame
causing a very large fire under the aircraft’s wing and severe loss of thrust on
engine 2 then engine 1.

In addition, the impossibility of retracting the landing gear probably contributed to the
retention and stabilisation of the flame throughout the flight.

— Accident on 25 July 2000 at La Patte d’Oie in Gonesse (95) to the Concorde Registered F-BTSC operated by Air France, Bureau Enquêtes-Accidents, Report Translation f-sc000725a, at Page 176

All 109 persons aboard the airliner and another 4 person on the ground were killed. 1 person was injured.

Accident investigators concluded that the Concorde had run over a metal strip on the runway which had fallen off of a Continental Airlines McDonnell Douglas DC-10, N13067, which had taken off from that runway a few minutes previously. The strip damaged the Concorde’s tire and caused it to fail.

Because the Concorde was vulnerable to a catastrophic accident resulting from such a minor issue as a failed tire, the fleet’s airworthiness certifications were suspended.

Air France Aérospatiale-BAC Concorde F-BTSC. (Michael Gilliand/Wikipedia)

F-BTSC had first flown 31 January 1975. At the time of the accident, it had flown 11,989 hours and 4873 cycles.

The production Concorde 100 was 202 feet, 4 inches (61.67 meters) long with a wingspan of 83 feet, 10 inches (25.55 meters) and overall height, and overall height of 40 feet, 0 inches. (12.19 meters). The series had an empty weight of 173,500 pounds (78,698 kilograms), MTOW 408,000 pounds (185,066 kilograms). F-BTSC was the heaviest airplane in the Concorde fleet, with a basic weight of 81,560 kilograms (179,809 pounds). Its takeoff weight on 25 July was 186,251 kilograms (410,613 pounds).

The Concorde was powered by four Rolls-Royce/SNECMA Olympus 593 Mk.610 engines. The Mk. 610 is a two-spool, axial-flow turbojet with afterburner. The compressor section as 14 stages (7 low- and 7 high-pressure stages). Two-stage turbine has 1 high- and 1 low-pressure stage. The engine has a maximum continuous power rating of 28,800 pounds of thrust (128.11 kilonewtons). It is rated at 37,080 pounds (164.94 kilonewtons) for takeoff (5 minute limit). During takeoff, the afterburners produce approximately 20% of the total thrust. The Olympus 593 Mk.613 is 1.212 meters (3.976378 feet) in diameter, 4.039 meters (13.251312 feet)long, and weighs 3,175 kilograms (7,000 pounds).

Production Concordes were certified for a maximum operating cruise speed of Mach 2.04, and a maximum operating altitude of 60,000 feet (18.288 meters). The maximum range 3,900 was nautical miles (4,488 statute miles/7,223 kilometers).

Victoria Cross, Captain Lanoe George Hawker, D.S.O., Royal Flying Corps.

July 25, 2024AviationAce, Aerial Combat, Bristol Scout C, British and Colonial Aeroplane Co. Ltd., Fighter Pilot, Lanoe George Hawker, Lewis Gun, Manfred Freiherr von Richthofen, No. 1611, No. 6 Squadron, Royal Flying Corps, Société des Moteurs Le Rhône, The Red Baron, Victoria Cross, World War IBryan Swopes

Captain Lanoe George Hawker, V.C., D.S.O., Royal Engineers and Royal Flying Corps (Imperial War Museum Catalog number Q 61077 — Captain Lanoe George Hawker, D.S.O., Royal Engineers and Royal Flying Corps (Imperial War Museum Catalog number Q 61077)

25 July 1915: Near Passchendaele, Belgium, Captain Lanoe George Hawker, DSO, No. 6 Squadron, Royal Flying Corps, was flying a single-engine Bristol Scout C, which he had had his mechanic equip with a single Lewis machine gun, fixed and firing 45° to the left to avoid the propeller arc.

Captain Hawker saw three enemy aircraft and attacked, shooting down all three. For this action, Captain Hawker was awarded the Victoria Cross. He was the third pilot, and the first ace, to receive Britain’s highest award for gallantry in combat.

War Office, 24th August 1915.

His Majesty the KING has been graciously pleased to award the Victoria Cross to the undermentioned Officers, Non-commissioned Officer and man, in recognition of their most conspicuous bravery and devotion to duty in the field:—

Captain Lanoe George Hawker, D.S.O., Royal Engineers and Royal Flying Corps.

For most conspicuoius bravery and very great ability on 25th July, 1915.

When flying alone he attacked three German aeroplanes in succession. The first managed to eventually escape, the second was driven to the ground damaged, and the third, which he attacked at a height of about 10,000 feet, was driven to the earth in our lines, the pilot and observer being killed.

The personal bravery shown by this Officer was of the very highest order, as the enemy’s aircraft were armed with machine guns, and all carried a passenger as well as the pilot.

—The London Gazette, Number 29273, 24 August 1915, at Page 8395, Column 1.

Hawker was credited with destroying 7 enemy aircraft in combat. His luck came to an end, however, on 23 November 1916, when he encountered Leutnant Manfred Albrecht Freiher von Richthofen of Jagdstaffel 2 near Begaume, France, while flying an Airco DH.2.

A lengthy battle ensued with neither fighter ace gaining advantage. Richthofen, “The Red Baron,” fired over 900 rounds during the fight. Running low on fuel, Hawker tried to break off and head for friendly lines. Almost there, he was struck in the head by a single machine gun bullet from Richthofen’s Albatros D.II. Major Hawker was killed and his airplane spun to the ground. He was the eleventh of Baron Richthofen’s eighty aerial victories.

The Baron took one of Hawker’s machine guns as a trophy.

Captain Hawker's Bristol Scout C, No. 1611, in which he destroyed three enemy aircraft in aerial combat, 25 July 1915. In this photograph, the angled placement of Hawker's Lewis machine gun is visible. — Captain Hawker’s Bristol Scout C, No. 1611, in which he destroyed three enemy aircraft in aerial combat, 25 July 1915. In this photograph, the angled placement of Hawker’s Lewis machine gun is visible. (Wikipedia)

The Bristol Scout C was a single-place, single-engine tractor-type biplane reconnaissance aircraft. It was manufactured by the British and Colonial Aeroplane Co., Ltd., at Brislington, south east of Bristol, England. The Scout C was 20 feet, 8 inches (6.299 meters) long with a wingspan of 24 feet, 7 inches (7.493 meters) and height of 8 feet, 6 inches (2.591 meters). The wings had a chord of 4 feet, 6 inches (1.372 meters) and vertical separation of 4 feet, 3 inches (1.295 meters). They were staggered 1 foot, 4½ inches (0.419 meters). The Scout C had an empty weight of 757 pounds (343 kilograms) and maximum gross weight of 1,195 pounds (542 kilograms).

The Scout C was powered by an air-cooled, normally-aspirated, 10.91 liter (665.79 cubic inch) Société des Moteurs Le Rhône 9C nine-cylinder rotary engine which produced 83 horsepower at 1,285 r.p.m. The engine turned a two-bladed, fixed-pitch wooden propeller through direct drive.

The Scout C had a maximum speed of 92.7 miles per hour (149.2 kilometers per hour) at ground level, and 86.5 miles per hour (139.2 kilometers per hour) at 10,000 feet (3,048 meters). It could climb to 10,000 feet in 21 minutes, 20 seconds. Its service ceiling was 15,500 feet (4,724 meters). It carried sufficient fuel to remain airborne for 2½ hours.

A total of 374 Bristol Scouts were built. 211 of these were of the Scout C variant.

25 July 1909

July 25, 2024AviationAllesandro Anzani & Co., Blériot Short-Span Monoplane, Blériot Type XI, Calais, Channel Crossing, Chevalier de la légion d'honneur, Cross Channel Flight, Dover, Dover Castle, English Channel, Louis Blériot, Louis Charles Joseph Blériot, Northfield Meadow, Société Pour L'Aviation et ses DérivésBryan Swopes

25 July 1909: At 4:41 a.m., Louis Charles Joseph Blériot took of from the hamlet of les Baraques,¹ near Sangatte, Pas-de-Calais, France, in his own Type XI single-engine monoplane, and flew across the English Channel (la Manche) to Dover. He landed at Northfall Meadow, near Dover Castle, Kent, England.

Feet wet: Blériot crossing the shoreline, outbound, on the morning of 25 July 1909. (Flight)

The airplane did not have a compass, so for a visual reference. Blériot used a 26-knot Pertuisane-class torpedo boat destroyer, Escopette, which was sailing toward Dover. After passing the ship, visibility deteriorated and he was only able to see the water below him.

A Marine Nationale Pertuisane-class torpedo boat destroyer (contre-torpilleur). This is the same class as Escopette. (Marius Bar)

Blériot flew on and after about ten minutes was able to see the coastline ahead. He realized that the wind had blown him to the east of his intended course, so he flew along the shoreline until he recognized a signal marking the landing point. The wind was gusty near the cliffs and he landed harder than intended, slightly damaging his airplane.

A contemporary aviation news publication reported:

. . . Accounts differ as to the exact moment of departure and descent, and as a matter of fact it is doubtful if any reliable timing was made since M. Bleriot started without a watch as well as without a compass. The distance of the flight was about 31 miles, and hence the speed was in the region of 45 miles an hour. During the crossing he flew at an altitude of 150 ft. to 300 ft., and thus kept much nearer the water than Mr. Latham did on his attempt.

—Flight: First Aero Weekly in the World. Vol. I, No. 31, 31July 1909, at Page 458, Column 2.

Louis Blériot with his Type XI monoplane at mid-Channel, 25 July 1909. (Library of Congress)

This was the first time an airplane had been flown across the English Channel, and brought Blériot international acclaim. He was appointed Chevalier de la légion d’honneur, by France. A London newspaper, the Daily Mail, awarded him a £1,000 prize.

Very quickly, orders for his Type XI were coming in. Between 1909 and 1914, approximately 900 were sold.

Louis Bleriot’s Channel-crossing Type XI monoplane was donated to the Musée des arts et métiers in Paris by the newspaper Le Matin, in October 1909. It remains in the museum’s permanent collection.

Louis Charles Joseph Blériot and his Type XI airplane at Northfall Meadow, Dover, shortly after arriving from France at 0517 a.m, 25 July 1909. (Library of Congress)

Louis Charles Joseph Blériot, *Chevalier de la légion d’honneur*. (Library of Congress)

Louis Charles Joseph Blériot was born 1 July 1872 at Cambrai, Nord, Pas-de-Calais, France. He was the son of Louis Charles Pierre Alexander Blériot and Clémence Marie Eugenie Candeliez Blériot. In 1882 Blériot was sent to l’Institution Notre-Dame de Grâce, a boarding school in Cambrai, and then, to a high school in northern France. He next studied at the Collège Sainte-Barbe in Paris. After a year there, he transferred to the École Centrale Paris, at Châtenay-Malabry, in southwest Paris.

In 1895–1896, Blériot served as a sous-lieutenant assigned to the 24ᵉ régiment d’artillerie (24th Regiment of Artillery) at Tarbes in the Pyrenees mountains, which divide France from Spain.

Blériot next worked as an electrical engineer and in 1896, he invented acetylene headlamps for use on automobiles. Blériot gained an interest in aviation after attending l’Exposition de Paris 1900. The income from his lamp manufacturing allowed him to conduct serious aeronautical experiments.

In 1901, Blériot married Mlle. Jeanne Alicia Védere (the marriage banns were published 2 February 1901). They would have six children, born between 1902 and 1929.

Mme. Blériot (née Jeanne Alicia Vedére) and M. Louis Charles Joseph Blériot at the House of Commons, Westminster, United Kingdom, 15 September 1909. (National Portrait Gallery, London)

Over the next few years, worked with several other pioneers of aviation, including Ernest rchdeacon, Léon Levavasseur, Gabriel Voison, Eventually, he started his own aeronautical research and aircraft manufacturing company, Recherches Aéronautique Louis Blériot. In 1913, he bought the aircraft manufacturing company that would become Société Pour L’Aviation et ses Dérivés, designers and builders of the legendary fighter of World War I, the SPAD S.XIII C.1. His businesses in France and England manufactured airplanes, automobiles and motorcycles.

In 1930, Blériot established the Blériot Trophy, to be awarded to an aviator who demonstrated flight at a speed of 2,000 kilometers per hour (1,242.742 miles per hour) for 30 minutes. 31 years later, 10 May 1961, the three-man crew of a Convair B-58A Hustler named The Firefly accomplished that feat.

Louis Charles Joseph Blériot died 2 August 1936, in Paris. He was buried at the Cimitière des Gonards, Versailles, Île-de France, France.

Louis Bleriot flew this airplane across the English Channel 25 July 1909. It was donated to the Musée des arts et métiers by the French newspaper, Le Matin, in October 1909. (Musée des arts et métiers)

The Blériot XI was a single-seat, single-engine monoplane. It was 26.24 feet (7.998 meters) long with a wingspan of 25.35 feet (7.727 meters) and height to the top of the cabane strut of 8.0 feet (2.438 meters). It had an empty weight of 507 pounds (229.9 kilograms). (Sources give conflicting specifications for the Blériot XI, probably because they were often changed in an effort to improve the airplane. The model flown across the English Channel was described by Flight as the Blériot Short-Span Monoplane. Dimensions given here are from the three-view drawings, below.)

In its original configuration, the Type XI was powered by an air-cooled, 3.774 liter (230.273 cubic inches) Robert Esnault-Pelterie (R.E.P.) two-row, seven-cylinder fan engine (or “semi-radial”), which produced 30 horsepower at 1,500 r.p.m., and drove a four-bladed paddle-type propeller. The R.E.P. engine weighed 54 kilograms (119 pounds). This engine was unreliable and was soon replaced by an Alessandro Anzani & Co. W-3.

The Anzani W-3 was an air-cooled, naturally-aspirated, 3.377 liter (206.078 cubic inch) 60° (some sources state 55°) three-cylinder “fan”-type radial engine (or W-3). It was a direct-drive, right-hand-tractor engine which produced 25 horsepower at 1,600 r.p.m. The W-3 was 0.300 meters (11.811 inches) long, 0.386 meters (15.197 inches) high, and 0.694 meters (2 feet, 3.323 inches) wide. The engine weighed 65 kilograms (143 pounds). The engine turned a highly-efficient Hélice Intégrale Chauvière two-bladed, fixed-pitch, propeller which had a diameter of 6 feet, 8 inches (2.032 meters). The Anzani W-3 cost 3,000 French francs in 1909.

The Blériot XI had a maximum speed of 47 miles per hour (76 kilometers per hour) and the service ceiling was approximately 1,000 meters (3,281 feet).

A description of the Blériot Type XI appeared in Vehicles of the Air, by Victor Loughead,² Second Edition, The Reilly and Britton Co., Chicago, 1910, Figure 197, between Pages 406 and 407:

¹ The village was renamed Sangatte-Blériot-Plage in 1936.

² Victor Loughead was the older brother of Allan and Malcolm Loughead, founders of the Loughead Aircraft Manufacturing Company of Santa Barbara, California, better known today as the Lockheed Martin Corporation.

24 July 1936

July 24, 2024AviationAmelia Earhart, Elmer C. McLeod, Hamilton Standard 12D-40, Lockheed Aircraft Company, Lockheed Electra 10E Special, NR16020, Pratt & Whitney Wasp S3H1, s/n 1055Bryan Swopes

Lockheed Electra 10E NR16020 (Lockheed Martin/Purdue University Libraries, Archives and Special Collections) — Lockheed Electra 10E Special NR16020 (Lockheed Martin/Purdue University Libraries, Archives and Special Collections)

24 July 1936: On her 39th birthday, at the Union Air Terminal, Burbank, California, Amelia Earhart accepted delivery of her new Lockheed Electra 10E Special, registered NR16020.

$80,000 to buy the Electra was provided by the Purdue Research Foundation from donations made by several individuals. George Palmer Putnam, Amelia’s husband, made the arrangements to order the airplane and in March 1936 gave Lockheed the authorization to proceed, with delivery requested in June.

The Electra Model 10 was manufactured by the Lockheed Aircraft Company at Burbank, California. It was an all-metal, twin-engine, low-wing monoplane with retractable landing gear, designed as a small, medium-range airliner. In the standard configuration it carried a crew of 2 and up to 10 passengers. The Model 10 was produced in five variants with a total of 149 airplanes built between August 1934 and July 1941. Lockheed built fifteen Model 10Es. Earhart’s was serial number 1055.

Amelia Earhart in the cocpit of her Lockheed Electra 10E, NR16020. — Amelia Earhart in the cockpit of her Lockheed Electra 10E Special, NR16020. The Sperry GyroPilot is at the center of the instrument panel. (AFP/Getty Images)

Earhart’s Electra was equipped with a Western Electric Model 13C radio transmitter and Model 20B receiver for radio communication. It used a Sperry GyroPilot gyroscopic automatic pilot. Additional modifications included four auxiliary fuel tanks in the passenger compartment, a navigator’s station to the rear of that, elimination of passenger windows, installation of the autopilot, navigation equipment and additional batteries. These modifications varied from the standard airplane enough that it was restricted to carrying only members of required flight crew. This was denoted by the letter “R” in the airplane’s registration.

Amelia Earhart stands behind the additional fuel tanks installed in the aft cabin of her Electra. (AP) — Photographed from the navigator’s station at the rear of the passenger cabin, Amelia Earhart leans over the additional fuel tanks installed in her Electra. (AP)

The Electra was not ready until mid-July. Earhart first flew the new airplane on 21 July with Lockheed test pilot Elmer C. McLeod.

The Electra 10E was 38 feet, 7 inches (11.760 meters) long with a wingspan of 55 feet (16.764 meters) and overall height of 10 feet, 1 inch (3.074 meters). The standard Model 10 had and empty weight of 6,454 pounds (2,927.5 kilograms) and a gross weight of 10,500 pounds (4,762.7 kilograms). NR16020 had an empty weight of 7,265 pounds (3295.4 kilograms). Lockheed’s performance data was calculated using 16,500 pounds (7,484.3 kilograms) as the Maximum Takeoff Weight.

NR16020 had a total fuel capacity of 1,151 gallons (4,357 liters) in ten tanks in the wings and fuselage. 80 gallons (302.8 liters) of lubricating oil for the engines was carried in four tanks.

Amelia Earhart poses with her Electra's Pratt & Whitney Wasp S3H radial engine and two-bladed Hamilton Standard variable-pitch, constant-speed propeller. — Amelia Earhart poses with one of her Electra’s Pratt & Whitney Wasp S3H1 radial engines and two-bladed Hamilton Standard constant-speed propeller. (AP)

Earhart’s Electra 10E Special was powered by two air-cooled, supercharged, 1,343.804-cubic-inch-displacement (22.021 liter) Pratt & Whitney Wasp S3H1 nine-cylinder radial engines, with a compression ratio of 6:1. These engines used a single-stage centrifugal supercharger and were rated at 550 horsepower at 2,200 r.p.m. at 5,000 feet (1,524 meters) and 600 horsepower at 2,250 r.p.m. for take off. The direct-drive engines turned 9 foot, 7/8-inch (3.010 meters) diameter, two-bladed, Hamilton Standard variable-pitch, constant-speed propellers. The Wasp S3H1 is 4 feet, 3.60 inches (1.311 meters) in diameter and 3 feet, 7.01 inches (1.093 meters) long. It weighed 865 pounds (392 kilograms).

Clarence L. (“Kelly”) Johnson with Amelia Earhart. (Lockheed Martin)

The maximum speed for the Model 10E Special at Sea Level and maximum takeoff weight was 177 miles per hour (285 kilometers per hour), a reduction of 25 miles per hour (40 kilometers per hour) over the standard airplane. The maximum range was calculated to be 4,500 miles (7,242 kilometers)

Lockheed test pilot Elmer C. McCleod with a Lockheed Model 10 Electra, "Phantom of the Sky." (Lockheed Martin via dmairfield.com) — Lockheed test pilot Elmer C. McCleod with a Lockheed Model 10 Electra, “Phantom of the Sky.” (Lockheed Martin via dmairfield.com)

This Day in Aviation

Important Dates in Aviation History