North American Aviation B-25B Mitchell 40-2291 at Eglin Field, Florida, March 1942. (U.S. Air Force)
27 March 1942: After three weeks of intensive training at Eglin Field, Florida, twenty-two North American Aviation B-25B Mitchell twin-engine medium bombers of the 34th Bombardment Squadron (Medium), 17th Bombardment Group (Medium), U.S. Army Air Force, under the command of Lieutenant Colonel James Harold Doolittle, completed a two-day, low-level, transcontinental flight, and arrived at the Sacramento Air Depot, McClellan Field, California, for final modifications, repairs and maintenance before an upcoming secret mission: The Halsey-Doolittle Raid.
The B-25 had made its first flight 19 October 1940 with test pilot Vance Breese and engineer Roy Ferren in the cockpit. It was a mid-wing airplane with twin vertical tails and retractable tricycle landing gear. The first 8–10 production airplanes were built with a constant dihedral wing. Testing at Wright Field showed that the airplane had a slight tendency to “Dutch roll” so all B-25s after those were built with a “cranked” wing, using dihedral for the inner wing and anhedral in the wing outboard of the engines. This gave it the bomber’s characteristic “gull wing” appearance. The two vertical stabilizers were also increased in size.
A 34th Bombardment Squadron B-25B Mitchell bomber at Mid-Continent Airlines, Minneapolis, Minnesota, for modifications, January–February 1942. (U.S. Air Force)
The B-25B Mitchell was operated by a crew of five: two pilots, a navigator, bombardier and radio operator/gunner. It was 53 feet, 0 inch (16.154 meters) long with a wingspan of 67 feet, 7.7 inches (20.617 meters) and overall height of 15 feet, 9 inches (4.801 meters). The The B-25B had an empty weight of 20,000 pounds (9,072 kilograms) and the maximum gross weight was 28,460 pounds (12,909 kilograms).
The B-25B was powered by two air-cooled, supercharged, 2,603.737-cubic-inch-displacement (42.668 liter) Wright Aeronautical Division Cyclone 14 GR2600B665 (R-2600-9) two-row 14-cylinder radial engines with a compression ratio of 6.9:1. The engines had a Normal Power rating of 1,500 horsepower at 2,400 r.p.m., and 1,700 horsepower at 2,600 r.p.m. for takeoff, burning 100-octane gasoline. These engines (also commonly called “Twin Cyclone”) drove three-bladed Hamilton Standard Hydromatic variable-pitch propellers through 16:9 gear reduction. The R-2600-9 was 5 feet, 3.1 inches (1.603 meters) long and 4 feet, 6.26 inches (1.378 meters) in diameter. It weighed 1,980 pounds (898 kilograms).
“On a low level training mission early in 1942 B-25 40-2297 would be airplane number 14 for the Doolittle Raid on Tokyo — This image was taken before the modification to the troublesome ventral turret. Pilot Major J.A. Hilger, Co-Pilot 2nd Lt. Jack A. Sims, Navigator 2nd Lt. James H. Macie, Jr., Bombardier S/Sgt. Jacob Eierman, Engineer/Gunner S/Sgt. Edwin V. Bain” —HISTORYNET
The medium bomber had a maximum speed of 322 miles per hour (518 kilometers per hour) at 15,000 feet (4,572 meters) and a service ceiling of 30,000 feet (9,144 meters).
It could carry a 3,000 pound (1,361 kilograms) bomb load 2,000 miles (3,219 kilometers). Defensive armament consisted of a single Browning M2 .30-caliber machine gun mounted in the nose, two Browning M2 .50-caliber machine guns in a power dorsal turret, and two more .50s in a retractable ventral turret. (The lower turrets were removed from all of the Doolittle B-25s.)
North American Aviation, Inc., built 9,816 B-25s at Inglewood, California, and Kansas City, Kansas. 120 of these were B-25Bs.
North American Aviation B-25 Mitchell medium bombers being assembled at the Kansas City bomber plant, October 1942. (Alfred T. Palmer, Office of War Information)
Stammlager Luft III prison in Province of East Silesia, World War II. (Muzeum Obózow Jenieckich W Żaganiu)
24 March 1944: At about 2230 hours, the first of 76 Allied prisoners of war interred at Stammlager LuftIII (Stalag Luft III) began to escape through a 30-foot-deep (9 meters), 320-foot-long (98 meters) tunnel, code-named “Harry.”
Aerial reconnaissance image of Stalag Luft III, 17 September 1944. (American Air Museum in Britain UPL 36335)
The prison, located just south of Sagan (Żagań) in East Silesia (now a part of Poland) was specially constructed to house captured Royal Air Force and other Allied airmen, and was controlled by the German air force, the Luftwaffe. Prior to this escape, the German captors had discovered at least 98 tunnels at the prison.
Popularly known as “The Great Escape,” this was the subject of a 1950 book, The Great Escape, by Paul Brickhill, who was a POW at the prison. His book was adapted into a very popular motion picture, “The Great Escape,” in 1963.
Squadron Leader Thomas Gresham Kirby-Green, RAF, and Flight Lieutenant Gordon Arthur Kidder, RCAF, were murdered by Gestapo agents near Zlín, Moravia, 29 March 1944. (This photograph may be of a reconstruction by the RAF Special Investigations Branch, circa 1946)
Cornelia Clark Fort with a Fairchild PT-19A Cornell trainer. (U.S. Air Force)
21 March 1943: Cornelia Clark Fort, a pilot in the Women’s Auxiliary Ferrying Squadron (the WAFS), was ferrying a new Vultee BT-13A Valiant basic trainer, serial number 42-42432, from the airplane factory at Downey, California, to an airfield in Texas. She was leading a flight of five BT-13s with the others being flown by inexperienced military pilots.
A flight of Vultee BT-13A Valiant basic trainers, 41-22226, 41-22666 and 41-23050. (Smithsonian Institution National Air and Space Museum NASM A19600288000a)
The left wing of Fort’s airplane was struck from behind by another airplane, BT-13A 42-42450, flown by Flight Officer Frank E. Stamme, Jr., U.S. Army Air Corps.
Fort’s BT-13 crashed approximately 10 miles (16 kilometers) south of Merkel, Texas, and Cornelia Fort was killed. Her body was found in the wreckage of the airplane. The canopy latches were still fastened.
The Associated Press reported:
Woman Ferry Pilot Killed
LONG BEACH, Calif., March 22. (AP)—The army air transport command’s ferrying division has announced the death of Cornelia Fort, twenty-three-year-old Nashville, Tenn., pilot.
Miss Fort was killed, the command said, on a routine ferrying flight yesterday at Merkel, Tex. She was the second woman to sign up with the women’s auxiliary ferrying squadron, and had had 1100 hours in the air.
Cause of the accident has not been learned, the command reported.
Fifteen months ago, a private flying instructor, Miss Fort was giving a lesson over Honolulu when the Japs attacked. Her surprised student almost piloted their plane into an enemy ship before she grabbed the controls, she related later.
Following her evacuation from the Hawaiian islands, she joined the auxiliary ferrying squadron and was stationed here. Miss Fort was the daughter of Cornelia Clark Fort of Fortland farms, near Nashville.
Cornelia Clark Fort was the first female pilot killed while on active duty with the United States military. She was 24 years old. Miss Fort was buried at the Mount Olivet Cemetery, Nashville, Tennesee.
Cornelia Clark Fort. (Tennessee State Library and Archives)
Cornelia Clark Fort was born into an affluent family in Nashville, Tennessee, 5 February 1919. She was the fourth of five children of Dr. Rufus Elijah Fort and Louise Clark Fort. Her father was a prominent surgeon who co-founded the National Life and Accident Insurance Company. The family lived at Fortland, an estate east of Nashville.
Cornelia Clark Fort. (1936 Milestones)
Cornelia attended the Ward-Belmont School in Nashville, then studied at the Ogontz School in Philadelphia. (Amelia Earhart had also attended Ogontz.) In 1937, Miss Fort transferred to Sarah Lawrence College, Yonkers, New York, where she studied Literature. She graduated 10 June 1939.
After taking a flight with a friend, Jack Caldwell, in January 1940, she pursued an interest in aviation, starting flight lessons the following day. Miss Ford had earned her pilot certificate and flight instructor certificate by June 1940. She was the first woman to become an instructor at Nashville. With the Civilian Pilot Training Program, she first went to Fort Collins, Colorado, where she taught for about three months, then went on to Honolulu, Territory of Hawaii.
On the morning of 7 December 1941, Cornelia Fort was practicing touch-and-goes with a student at John Rodgers Airport, near Honolulu.
Shortly before 8:00 a.m., Miss Fort saw a silver military-type airplane approaching her Interstate Cadet at high speed. She took over the flight controls from Mr. Suomala and put the trainer into a steep climb. The other airplane flew directly under, close enough that she felt the vibrations of its engine. She saw that its wings carried the “rising sun” insignia of the Empire of Japan.
Fort landed the Cadet at John Rogers Airport, which was being attacked by Japanese airplanes. Another trainer on the ground was destroyed by machine gunfire and its instructor killed.
“WAFS WELCOMED—Mrs. Nancy H. Love (left), commander, is shown in this photo greeting Women’s Auxiliary Ferrying Command recruits at New Castle, Del. The fledglings are, left to right, Cornelia Fort, Helen Clark, Aline Rhonie and Betty Gillies.” (AP Wirephoto, The Evening Sun (Baltimore, Maryland), Vol. 65—No. 137, Thursday, 24 September 1942, Page 28, Columns 5–8)
Following the attack on Pearl Harbor, all civilian aircraft were grounded. Cornelia Fort was able to return to the mainland United States in early 1942. In September she was one of the first 25 women accepted into the Women’s Auxiliary Ferrying Squadron. Miss Fort was assigned to the 6th Ferrying Group based at Long Beach, California.
Pilots of the Women’s Auxiliary Ferrying Squadron at Long Beach Army Airfield, 7 March 1943. Left to right, Barbara Towne, Cornelia Clark Fort, Evelyn Sharp, Barbara Erickson and Bernice Batten. The airplane is a Vultee BT-13 Valiant. (Image Courtesy of the WASP Archive, The TWU Libraries’ Woman’s Collection, Texas Woman’s University, Denton, Texas)
Air & Space/Smithsonian quoted from a letter written by Fort in a January 2012 article:
“I dearly loved the airports, little and big. I loved the sky and the airplanes, and yet, best of all I loved the flying. . . I was happiest in the sky at dawn when the quietness of the air was like a caress, when the noon sun beat down, and at dusk when the sky was drenched with the fading light.”
—Cornelia Clark Fort, 1942.
Cornelia Clark Fort’s military identification card. (Nashville Public Library)
Frank Edward Stamme, Jr., was born at Dorchester, Illinois, 3 January 1920. He was the first of four children of Frank Edward Stamme, a machinist, and Bertha Catherine Peters Stamme.
Stamme enlisted as a private in the U.S. Army Air Corps at San Francisco, California, 5 November 1941. He had brown hair, gray eyes, was 6 feet, 1 inch (1.85 meters) tall and weighed 159 pounds (72 kilograms). At the time of the collision, he had approximately 250 hours flight time. Stamme was released from military service 16 January 1947. He died 19 February 1987 at San Pablo, California.
Vultee BT-13A Valiant 42-43130, the same type aircraft flown by Cornelia Fort and Frank Stamme, 21 March 1943. (U.S. Air Force)
The Vultee BT-13A Valiant was an all-metal, two-place, single engine, low-wing monoplane with fixed landing gear. The airplane was 28 feet, 10 inches (8.788 meters) long with a wingspan of 42 feet, 0 inches (12.802 meters) and height of 11 feet, 4-3/8 inches (3.464 meters). It had an empty weight of approximately 3,375 pounds (1,531 kilograms) and “maximum recommended flying weight” of 4,745 pounds (2,152 kilograms).
The BT-13A was powered by an air-cooled, supercharged, 986.749-cubic-inch-displacement (16.170 liter) Pratt & Whitney R-985-AN-1, -AN-3, or R-985-25 nine-cylinder radial engine. These engines had a compression ratio of 6:1, with Normal Power ratings from 420 horsepower at 2,200 r.p.m. at Sea Level to 450 horsepower at 2,300 r.p.m., and 440 horsepower to 450 horsepower at 2,300 r.p.m. for Takeoff. They were direct-drive engines which turned a two-bladed variable-pitch propeller. These engines were 3 feet, 6.38 inches (1.076 meters) long, 3 feet, 9.75 inches (1.162 meters) in diameter and weighed from 648 to 685 pounds (294–311 kilograms).
The BT-13A had a maximum speed (VNE) of 230 miles per hour (370 kilometers per hour). The service ceiling was 21,650 feet (6,599 meters) and range was 725 miles (1,167 kilometers).
Vultee built 9,525 BT-13 and BT-15 Valiant basic trainers between 1940 and 1945. Of these, 7,037 were the BT-13A and SNV-1 variant. By the end of World War II, the Vultee Valiant was considered obsolete and was replaced in U.S. service by the North American AT-6 Texan.
USS Langley (CV-1) underway, circa 1926. (U.S. Navy)
20 March 1922: USS Langley (CV-1) was commissioned as the first aircraft carrier of the United States Navy. It was a former collier, USS Jupiter (AC-3), which had been converted at the Norfolk Navy Yard, 1921–1922.
USS Langley was 542 feet (165.2 meters) long, with a beam of 65 feet, 5 inches (19.94 meters) and draft of 24 feet (7.32 meters). Her full load displacement was 14,100 tons (12,791 metric tons).
Langley’s bridge was located under the flight deck at the forecastle break. (National Naval Aviation Museum NNAM.1996.488.010.002)
The aircraft carrier was powered by General Electric turbo-electric drive, with a total of 7,200 shaft horsepower. Steam turbines drove generators which supplied power for electric motors which drove the propeller shafts. She could make 15.5 knots (28.7 kilometers per hour).
The ship’s complement was 468 officers and men.
Defensive armament consisted of four 5-inch/51-caliber (127 millimeters × 6.477 meters) guns. These guns, firing a 50 pound (22.7 kilogram) projectile, had a maximum range of 15,850 yards (14,493 meters).
USS Langley (CV-1) with Vought VE-7SF fighters on the flight deck, at anchor off Culebra Island, Puerto Rico, 18 March 1926. In the background are a USS Tennessee-class and two USS New Mexico-class battleships. (U.S. Navy)
Lieutenant Commander Virgil Childers (“Squash”) Griffin, Jr., United States Navy, made the first takeoff from an aircraft carrier of the U. S. Navy when he flew a Chance Vought Corporation VE-7SF fighter from the deck of USS Langley (CV-1), 17 October 1922, while the ship was anchored in the York River along the west side of Chesapeake Bay, Maryland.
As more modern aircraft carriers Lexington and Saratoga came in to service, Langley was once again converted, this time to a sea plane tender, AV-3.
USS Langley (AV-3) shortly after conversion to a seaplane tender, circa 1937. (U.S. Navy)Curtiss P-40E Warhawks of the 13th Pursuit Squadron (Provisional) at Richmond Field, Sydney, Australia, 13 February 1942. (Texas A&M University Press)
Langley, under the command of Commander Robert P. McConnell, USN, delivered a cargo of thirty-two Curtiss P-40E Warhawks for the 13th Pursuit Squadron (Provisional) from Fremantle, Western Australia, to Tjilatjap Harbor, on the southern coast of Java, Dutch East Indies. After leaving the harbor on 27 February 1942, Langley was attacked by a group of Imperial Japanese Navy Mitsubishi G4M “Betty” twin-engine medium bombers.
After evading several bomb runs, Langley was hit by six bombs. On fire and with its engine room flooded, the crew was forced to abandon ship. Langley was torpedoed by an escorting destroyer, USS Whipple (DD-217), to prevent capture.
A torpedo fired by U.S.S. Whipple (DD-217) strikes USS Langley, 27 February 1942. (United States Navy, Naval History and Heritage Command NH 92476)
The crew of Langley were taken aboard a fleet oiler, USS Pecos (AO-6), and thirty-three Air Corps pilots were transferred USS Edsall (DD-219). Pecos was sunk while enroute to Australia, with the loss of many lives. Edsall was also sunk and thirty-one of the Army pilots died.
USS Langley (AV-3) sinking. Photographed from USS Whipple (DD-217), 27 February 1942. (U.S. Navy Naval History and Heritage Command NH 92474)
More aircraft carriers would follow and were the key to the United States Navy victory in the Pacific Ocean, bringing World War II to a close.
“Murderers’ Row” Third Fleet aircraft carriers at anchor in Ulithi Atoll, 8 December 1944, during a break from operations in the Philippines area. The carriers are (from front to back): USS Wasp (CV-18), USS Yorktown (CV-10), USS Hornet (CV-12), USS Hancock (CV-19) and USS Ticonderoga (CV-14). Wasp, Yorktown and Ticonderoga are all painted in camouflage Measure 33, Design 10a. Photographed from a USS Ticonderoga plane. Official U.S. Navy Photograph #: 80-G-294131
One hundred years after USS Langley was commissioned, the aircraft carrier is the center of the American fleet. The Nimitz-class carriers are the most powerful warships ever built.
19 March 1945: Modified Avro Lancaster B Mk.I Special heavy bombers of No. 617 Squadron, Royal Air Force, attacked the railway viaduct at Arnsberg, Germany, using the 22,000 pound (9,979 kilogram) Grand Slam earth-penetrating bomb. The bomb had been first used just days before, 14 March, against another railway viaduct.
The Grand Slam was the largest and heaviest aerial bomb used during World War II. It was designed by aircraft engineer Barnes Neville Wallis, and was scaled up from his earlier, smaller “Tallboy.” (Wallis also designed the “Upkeep” Special Mine used to attack hydroelectric dams in the Ruhr Valley in 1943.)
Wallis’ idea was that a very heavy, supersonic bomb could penetrate deep into the earth and detonate, causing an “earthquake” which could destroy nearby heavily protected targets.
Tall Boy and Grand Slam Deep Penetration Bombs (British Explosive Ordnance, Part 1, Chapter 7)
The Grand Slam bomb (officially, “Bomb, D.P., 22,000-lb., Mk I”) was 25 feet, 5 inches (7.747 meters) long and had a maximum diameter of 3 feet, 10 inches (1.168 meters). When fully loaded with the explosive material, Torpex, the bomb weighed 22,400 pounds (10,160 kilograms).
Completed bomb casings for Barnes Wallis’ 22,000-pound “Grand Slam” deep penetration bomb, photographed 7 January 1945. The individual weight is stenciled on each casing. (Tyne & Wear Archives)
The bomb case was cast of steel at the Clyde Alloy and Steel Company, Glasgow, Scotland, then, after several days of cooling, machined to its precise shape. The casing made up approximately 60% of the bomb’s total weight. At the nose, the casing had a wall thickness of 7.75 inches (19.685 centimeters).
The bomb case was filled with approximately 9,200 pounds (4,173 kilograms) of molten Torpex, with a 1 inch (2.54 centimeters) topping of TNT. Torpex was an explosive designed for torpedo warheads and depth charges. It was made up of approximately equal quantities of two other explosives, Research Department Formula X (RDX), 42%, and trinitrotoluol (TNT), 40%, mixed with 18% powdered aluminum and wax. The resulting combination was approximately 1.4 times more powerful than TNT alone. About one month was required for the explosive to cool after being poured into the bomb case.
Because of its size and weight, the only Allied bomber capable of carrying the Grand Slam was a specially modified Avro Lancaster B.I Special, flown by No. 617 Squadron, Royal Air Force, “The Dambusters.”
An Avro Lancaster very long range heavy bomber carrying a Gland Slam bomb. (Royal Air Force)
Wallis intended for the Grand Slam to be dropped from very high altitudes so that during its fall, it would go supersonic. The bomb had large fins that were offset 5° to the right of the centerline to cause it to rotate for stability. However, the bombers could not carry it to the planned release altitude, and it was typically dropped from approximately 9,000 feet (2,743 meters). Its very sleek design did allow it to come close to the speed of sound, however, and its stability made it a very accurate weapon. The bomb was capable of penetrating 20-foot-thick (6 meters) reinforced concrete roofs of submarine bases. ¹
Arnsberg railway viaduct following Grand Slam bombing attack. (Royal Air Force)
Barnes Neville Wallis, Esq., M. Inst. C.E., F.R.Ae.S., Assistant Chief Designer Vickers-Armstrongs Ltd., was appointed Commander of the Most Excellent Order of the British Empire (Civil Division), by His Majesty, King George VI, 2 June 1943.
Sir Barnes Neville Wallis C.B.E., was knighted by Her Majesty, Queen Elizabeth II, 13 December 1968.
Sir Barnes Neville Wallis C.B.E.
¹ “The striking velocity of the bomb, when released at an altitude of 16,000 ft. and an air speed of 200 m.p.h., is stated at 1,097 ft./sec., at which speed it has developed a rotational velocity of 60 r.p.m.” —British Explosive Ordnance, Part 1, Chapter 7
![A drawing showing the proposed route of one of the escape tunnels, by wartime artist Ley Kenyon, a prisoner-of-war in Stalag Luft III at the time of the Great Escape in March 1944 [Picture: from the original drawings of Ley Kenyon 1943] (GOV.UK)](https://static.thisdayinaviation.com/wp-content/uploads/tdia/2016/03/ODD_5948.jpg.webp)
