Category Archives: Aviation

6 May 1941

Aviation, , , , , , , , , , , , , , , ,
Republic XP-47B 40-3051 prototype in flight. (Republic Aircraft Corporation)

6 May 1941: Just eight months after a prototype for a new single-engine fighter was ordered by the U.S. Army Air Forces, test pilot Lowery Lawson Brabham took off from the Republic Aviation Corporation factory airfield at Farmingdale, New York, and flew the prototype XP-47B Thunderbolt, serial number 40-3051, to Mitchel Field, New York.

During the flight, oil which had collected in the exhaust duct began burning. There was so much smoke that Brabham considered bailing out. He stayed with the prototype, though, and when he arrived at Mitchel Field, he exclaimed, “I think we’ve hit the jackpot!”

Alexander Kartveli

The prototype was designed by Alexander Kartveli, a Georgian immigrant and former chief engineer for the Seversky Aircraft Corporation, which became the Republic Aviation Corporation in 1939.

Alexander Kartveli (née Kartvelishvili, ალექსანდრე ქართველი) was born in Tbilisi, in the Kutais Governorate of the Russian Empire, (what is now, Georgia). After World War I, during which he was wounded, Kartvelishvili was sent to study at the Paris Aviation Higher College of Engineering in France by the government of the Democratic Republic of Georgia. He graduated in 1922. Kartvelishvili did not return to his country, which had fallen to the Red Army in the Soviet-Georgian War. He worked for Blériot Aéronautique S.A. until 1928, when he was employed by the Fokker American Company (also known as Atlantic Aircraft, or Atlantic-Fokker) which was headquartered at Passaic, New Jersey, in the United States. In 1931, he became chief engineer for the Seversky Aircraft Company in Farmingdale.

Republic XP-47B Thunderbolt prototype 40-3051 at Farmingdale, New York, 1941. The pilot standing in front of the airplane gives a scale reference. (Republic Aviation Corporation)

Kartveli submitted his design proposal for the XP-47B to the U.S. Army Air Corps, 12 June 1940. The prototype was ordered 6 September, and a week later, 13 September 161 production P47Bs and 602 P-47Cs were ordered. The contract was for $56,499,924. The company named the new fighter “Thunderbolt,” which had been suggested by C. Hart Miller, director of the military contracts division of Republic Aviation.

The XP-47B was the largest single-engine fighter that had yet been built. The production P-47B was 34 feet, 10 inches (10.617 meters) long with a wingspan of 40 feet, 9-5/16 inches (12.429 meters), and height of 12 feet, 8 inches (3.861 meters).¹ The wing area was 300 square feet (27.9 square meters). At a gross weight of 12,086 pounds (5,482 kilograms), it was nearly twice as heavy as any of its contemporaries.

Republic XP-47B Thunderbolt 40-3051 at Wright Field, Dayton, Ohio.(Ray Wagner Collection, San Diego Air & Space Museum Archives )

The XP-47B was powered by an air-cooled, supercharged and turbocharged, 2,804.4-cubic-inch-displacement (45.956 liter) Pratt & Whitney R-2800-21 (Double Wasp TSB1-G) two-row, 18-cylinder radial with a compression ratio of 6.65:1 had a normal power rating of 1,625 horsepower at 2,550 r.p.m., to an altitude of 25,000 feet (7,620 meters), and a takeoff/military power rating of 2,000 horsepower at 2,700 r.p.m. at 25,000 feet (7,620 meters). The engine drove a 12-foot, 2 inch (3.708 meter) diameter, four-bladed Curtiss Electric constant-speed propeller through a 2:1 gear reduction. The R-2800-21 was 4 feet, 4.50 inches (1.340 meters) in diameter and 6 feet, 3.72 inches (1.923 meters) long. The engine weighed 2,265 pounds (1,027 kilograms). Approximately 80% of these engines were produced by the Ford Motor Company. It was also used as a commercial aircraft engine, with optional propeller gear reduction ratios.

A large General Electric turbosupercharger was mounted in the rear of the fuselage. Internal ducts carried exhaust gases from the engine to drive the turbocharger. This supercharged air was then carried forward through an intercooler and then on to the carburetor to supply the engine. The engine’s mechanical supercharger further pressurized the air-fuel charge.

Republic XP-47B 40-3051. The pilot enters the cockpit through a hinged canopy segment. (Ray Wagner Collection Catalog, San Diego Air and Space Museum)

During flight testing, the XP-47B Thunderbolt demonstrated speeds of 344.5 miles per hour (554.4 kilometers per hour) at 5,425 feet (1,654 meters), and 382 miles per hour (615 kilometers per hour) at 15,600 feet (4,745 meters). Its maximum speed was 412 miles per hour (663 kilometers per hour) at 25,800 feet (7,864 meters). The test pilot reported that the engine was unable to produce full power during these tests. It was determined that it had a cracked cylinder head, resulting in a loss of 2.5–4% of its maximum rated power. Also, the XP-47B was painted in camouflage, resulting in a slight loss of speed.

It could climb to 15,000 feet (4,572 meters) in just five minutes.

The Thunderbolt was armed with eight Browning AN-M2 .50-caliber machine guns, four in each wing, with 3,400 rounds of ammunition. It could also carry external fuel tanks, rockets and bombs. The structure of the P-47 could be described as “robust” and it was heavily armored. The amount of damage that the airplane could absorb and still return was remarkable.

 

Republic XP-47B Thunderbolt 40-3051, 4 May 1941. (U.S. Air Force)
Republic XP-47B Thunderbolt 40-3051, 4 May 1941. (Republic Aviation Corporation)

During a test flight, 4 August 1942, the XP-47B’s tail wheel was left down. The extreme heat of the turbocharger’s exhaust set fire to the tire, which then spread to the airplane’s fabric-covered control surfaces. Unable to control the airplane, test pilot Filmore L. Gilmer bailed out. The prototype Thunderbolt crashed into Long Island Sound and was destroyed.

The third production Republic P-47B Thunderbolt, 41-5897, at Langley Field, Virginia, 24 March 1942. The door-hinged canopy of the XP-47B has been replaced by a rearward-sliding canopy, requiring that the radio antenna mast be moved.(NASA)
A Republic P-47B Thunderbolt in the NACA Full Scale Tunnel, 31 July 1942. (NASA LMAL 29051)

A total of 15,683 Thunderbolts were built; more than any other U.S. fighter type. In aerial combat, it had a kill-to-loss ratio of 4.6:1. The P-47, though, really made its name as a ground attack fighter, destroying aircraft, locomotives, rail cars, and tanks by the many thousands. It was one of the most successful aircraft of World War II.

¹ Data from Pilot’s Flight Operating Instructions, Technical Order No. 01-65BC-1, 20 January 1943

© 2018, Bryan R. Swopes

6 May 1937

Aviation, , , , , , ,
Airship D-LZ129 Hindenburg moored at New Jersey at the end of a previous voyage.
Airship D-LZ129 Hindenburg moored at New Jersey at the end of a previous voyage.

6 May 1937: After a three-day Trans-Atlantic crossing from Frankfurt, Germany, the rigid airship Hindenburg (D-LZ129) arrived at Lakehurst, New Jersey, with 36 passengers and 61 crewmembers.

Airship LZ-129 Hindenburg burning, 1925 hours, 6 May 1937, at Lakehurst, New Jersey.
Airship LZ-129 Hindenburg burning, 1925 hours, 6 May 1937, at Lakehurst, New Jersey.

At 7:25 p.m., while the airship was being moored, it suddenly caught fire. The fabric covering burned first, but then the hydrogen gas contained in the buoyancy tanks exploded and burned. Hindenburg settled to the ground and was completely destroyed within 30 seconds.

Water ballast rains down as Hindenburg burns at the mooring mast 1925 hours, 6 May 1937, at Lakehurst, New Jersey. SFA003016395
Hindenburg NY Daily News
Hindenburg settles to the ground. (Arthur Cofod, Jr./USAF 12293 A.C.)

Of those on board, 13 passengers and 22 crewmembers died. One member of the ground crew was also killed.

Surprisingly, though there were many survivors and witnesses—as well as newsreel footage of the accident—the cause has never been determined.

This dramatic accident ended the airship passenger industry.

Airship LZ-129 Hindenburg burning, 1925 hours, 6 May 1937, at Lakehurst, New Jersey.
Airship LZ-129 Hindenburg burning, 1925 hours, 6 May 1937, at Lakehurst, New Jersey.
Hindenburg burning
Wreckage of Hindenburg, photographed the following day.

© 2015, Bryan R. Swopes

6 May 1935

Aviation, , , , , , , , , , ,
Curtiss-Wright Model 75, X17Y. (Ray Wagner Collection, San Diego Air & Space Museum Archives)

6 May 1935: At Buffalo, New York, the prototype Curtiss-Wright Model 75, X17Y, serial number 11923, made its first flight.

Donovan Reese Berlin. (Niagara Aerospace Museum)

Designed by Donovan Reese Berlin, the airplane was a modern design of all metal construction, with fabric covered control surfaces. The Model 75 was a single-seat, single-engine low-wing monoplane with retractable landing gear.

Curtiss-Wright Model 75, X17Y. (Ray Wagner Collection, San Diego Air & Space Museum Archives)

In its original configuration, the Model 75 was powered by an air-cooled, supercharged 1,666.860 cubic inch displacement (27.315 liter) Wright Aeronautical Division GR1670A1 two-row 14-cylinder radial engine. The GR1670A1 was a developmental engine with a compression ratio of 6.75:1. It was rated at 775 horsepower at 2,400 r.p.m. at Sea Level, and 830 horsepower at 2,600 r.p.m. for takeoff, burning 87-octane gasoline. The engine was 3 feet, 9 inches (1.143 meters) in diameter, 4 feet, 4–25/32 inches (1.341 meters) long, and weighed 1,160 pounds (526 kilograms). The GR1670A1 drove a three-bladed Curtiss Electric constant-speed propeller through a 16:11 gear reduction.

The GR1670A1 was also used in the Seversky SEV-S1, NR18Y, a record-setting experimental variant of the rival Seversky P-35.

The United States Department of Commerce, Bureau of Air Commerce, registered X17Y to the Curtiss-Wright Corporation, Kenmore & Vulcan Street, Buffalo, New York, on issued 1 June 1936. This registration was cancelled 26 April 1937.

Curtiss-Wright Model 75, X17Y. (Ray Wagner Collection, San Diego Air & Space Museum Archives)
Curtiss-Wright Model 75, X17Y. (Ray Wagner Collection, San Diego Air & Space Museum Archives)

The Curtiss-Wright Model 75 would be developed into the P-36 Hawk fighter for the U.S. Army Air Corps. France ordered it as the H75A-1, and in British service, it was known as the Mohawk Mk.I.

The tenth production P-36 was modified with a liquid-cooled Allison V-1710 V-12 engine to become the prototype XP-40.

1st Lieutenant Benjamin Scovill Kelsey in the cockpit of a Curtiss-Wright P-36A Hawk, circa 1938. (U.S. Air Force)
1st Lieutenant Benjamin Scovill Kelsey, Air Corps, United States Army, with a Curtiss Wright P-36A Hawk, Air Corps serial number 38-2, at Wright Field, Ohio, circa 1938. (Ray Wagner Collection/San Diego Air & Space Museum Archives)
Curtiss-Wright P-36B 38-020. (U.S. Air Force)
Curtiss-Wright P-36B 38-020. (U.S. Air Force)
Curtiss-Wright P-36C camouflage test, Maxwell Field, 1940. (Ray Wagner Collection, San Diego Air & Space Museum Archives)
Curtiss-Wright P-40 Warhawk, 55th Pursuit Squadron, Oakland, CA, 1941 (IWM FRE11437)

© 2019, Bryan R. Swopes

5 May 1943

Aviation, , , , , , ,
North American Aviation P-51B-1-NA Mustang 43-12093 (102-24541), the first production P-51B. (NASA Langley Research Center Vintage Photographs Collection)

5 May 1943: First flight of a production North American Aviation P-51B-1-NA Mustang, 43-12093 (NAA serial number 102-24541).

Compare the Merlin-powered P-51B, above, to this Allison-engined P-51A-1-NA Mustang, 43-6008 (99-22111). (NASA)

North American Aviation, Inc., located at Mines Field, Los Angeles, California (now, Los Angeles International Airport, or more commonly, LAX), contracted with the British Purchasing Commission to produce a new fighter designed around the liquid-cooled Allison Engineering Company V-1710-F3R V-12 engine. Just 117 days later, the first prototype, the NA-73X, was completed. The airplane made its first flight on 26 October 1940, with free-lance test pilot Vance Breese. The British ordered 320 fighters for the Royal Air Force, and named it the Mustang Mk.I. Soon after, a second order for 300 airplanes came through. On 23 April 1941, North American test pilot Louis Sanford Wait flew the first production airplane, RAF serial number AG345.

The first production Mustang Mk.I, AG345, first flight, 23 April 1941. (North American Aviation, Inc.)

The Mk.I was 30 miles per hour (48 kilometers per hour) faster than its contemporary, the Curtiss-Wright P-40 Warhawk, though both used the same engine and propeller. Below 15,000 feet (4,572 meters), the Mustang was also 30–35 m.p.h (48–56 kilometers per hour) faster than a Supermarine Spitfire, which had the more powerful Roll-Royce Merlin V-12.

Allison V-1710-39 (F3R) V-12 aircraft engine, right rear quarter view. (Allison)

The Mustang Mk.I was heavily armed with eight machine guns. Two Browning .50-caliber machine guns were positioned under the engine, synchronized to fire forward through the propeller arc. Two more .50s and four .303-caliber Browning Mark II machine guns were installed in the wings.

Two Mustang Mk.Is, the fourth and tenth production airplanes, were turned over to the United States Army Air Corps for testing at Wright Field, Dayton, Ohio. These were designated XP-51 by the Air Corps. Test pilot Robert Creed Chilton took the first XP-51, 41-038 (ex-RAF AG348) for its first flight, 20 May 1941. Both airplanes were also extensively tested by the National Advisory Committee for Aeronautics (NACA) at the Langley Memorial Aeronautical Laboratory, Hampton, Virginia.

North American Aviation XP-51 at Wright Field. (Charles M. Daniels Collection, San Diego Air & Space Museum Archives)

The Air Corps initially ordered the airplane as a dive bomber, designated A-36 Apache. With various changes from the British fighter, on 23 June 1942, the Air Corps ordered 1,200 fighters as the P-51A. Chilton flew the first production P-51A, 43-6003, on 3 February 1943.

In England, tests were made of the Mustang Mk.I with Rolls-Royce Merlin 61 and 65 V-12 engines installed in place of the Allison V-1710. Called the Mustang X, it proved to be a superior fighter, particularly at high altitude. The RAF ordered it as the Mustang Mk.III.

Identical to the Inglewood, California-built North American Aviation P-51B Mustang, this is a Dallas, Texas-built P-51C-1-NT, 42-103023. (North American Aviation, Inc.)

In the United States, the Packard Motor Car Company of Detroit, Michigan, had begun building Merlin engines under license from Rolls-Royce. These American engines were designated V-1650. North American modified two P-51As from the production line to install the Packard V-1650-3. These were designated XP-51B. Testing revealed that the new variant was so good that the Army Air Corps limited its order for P-51As to 310 airplanes and production was changed to the P-51B.

The P-51B and P-51C are virtually identical. The P-51Bs were built by North American Aviation, Inc., at Inglewood, California. P-51Cs were built at North American’s Dallas, Texas plant. They were 32 feet, 2.97 inches (9.829 meters) long, with a wingspan of 37 feet, 0.31-inch (11.282 meters) and overall height of 13 feet, 8 inches (4.167 meters) high. The fighter had an empty weight of 6,985 pounds (3,168 kilograms) and a maximum gross weight of 11,800 pounds (5,352 kilograms).

P-51Bs and Cs were powered by a right-hand tractor, liquid-cooled, supercharged, 1,649-cubic-inch-displacement (27.04-liter) Packard V-1650-3 or -7 Merlin single overhead cam (SOHC) 60° V-12 engine which produced 1,380 horsepower at Sea Level, turning 3,000 r.p.m at 60 inches of manifold pressure (V-1650-3) or 1,490 horsepower at Sea Level, turning 3,000 r.p.m. at 61 inches of manifold pressure (V-1650-7). (Military Power rating, 15 minute limit.) These were license-built versions of the Rolls-Royce Merlin 63 and 66. The engine drove a four-bladed Hamilton Standard Hydromatic constant-speed propeller with a diameter of 11 feet, 2 inches (3.404 meters) through a 0.479:1 gear reduction.

A Packard Motor Car Company V-1650-7 Merlin V-12 aircraft engine at the Smithsonian Institution National Air and Space Museum. This engine weighs 1,715 pounds (778 kilograms) and produces 1,490 horsepower at 3,000 r.p.m. Packard built 55,873 of the V-1650 series engines. Continental built another 897. The cost per engine ranged from $12,548 to $17,185. (NASM)

The P-51B/C had a cruise speed of 362 miles per hour (583 kilometers per hour) and the maximum speed was 439 miles per hour (707 kilometers per hour) at 25,000 feet (7,620 meters). The service ceiling was 41,900 feet (12,771 meters). With internal fuel, the combat range was 755 miles (1,215 kilometers).

In U.S. service, armament consisted of four air-cooled Browning AN-M2 .50-caliber machine guns, mounted two in each wing, with 350 rounds per gun for the inboard guns and 280 rounds per gun for the outboard.

1,988 P-51B Mustangs were built at North American’s Inglewood, California plant and another 1,750 P-51Cs were produced at Dallas, Texas. This was nearly 23% of the total P-51 production.

North American P-51B Mustang with identification stripes. (U.S. Air Force)

© 2019, Bryan R. Swopes

4 May 1967

Aviation, , , , , , , , , , ,
Colonel Robin Olds, United States Air Force, winc Commander, 8th Tactical Fighter Wing, Ubon Ratchitani RTAFB.
Colonel Robin Olds, United States Air Force, Wing Commander, 8th Tactical Fighter Wing, Ubon Rachitani RTAFB. (U.S. Air Force)

4 May 1967: Colonel Robin Olds, United States Air Force, commanding the 8th Tactical Fighter Wing based at Ubon RTAFB, shot down his second enemy airplane during the Vietnam War.

Colonel Olds had flown Lockheed P-38 Lightning and North American P-51 Mustang fighters during World War II. He is officially credited with shooting down 12 enemy airplanes over Europe and destroying 11.5 on the ground. On 2 January 1967, he had destroyed a MiG-21 near Hanoi, North Vietnam, while flying a McDonnell F-4C Phantom II. He was the first U.S. Air Force fighter ace to shoot down enemy aircraft during both World War II and the Vietnam War.

Colonel Robin Olds and 1st Lieutenant William D, Lefever (standing, left and center) with other pilots of the 555th Tactical Fighter Squadron, 8th Tactical Fighter wing, Ubob Rachitani RTAFB, 4 May 1967. (U.S. Air Force via Jet Pilot Overseas)
Colonel Robin Olds and 1st Lieutenant William D. Lefever (standing, left and center) with other pilots of the 555th Tactical Fighter Squadron, 8th Tactical Fighter Wing, Ubon Rachitani RTAFB, 4 May 1967. (U.S. Air Force via Jet Pilot Overseas)

A description of the air battle follows:

On 4 May, the 8th TFW provided two flights of Phantoms for MiGCAP for five F-105 flights of the 355th TFW which were on a strike mission. Col. Olds, 8th Wing commander, led the rear flight, flying with 1st Lt. William D. Lafever. The other F-4 flight was sandwiched midway in the strike force. MiG warnings crackled on Olds’ radio just before his wingman sighted two MiG-21s at 11 o’clock, attacking the last of the Thunderchief flights. Colonel Olds’ account picks up the encounter at this point:

“The MiGs were at my 10 o’clock position and closing on Drill [the F-105 flight] from their 7:30 position. I broke the rear flight into the MiGs, called the F-105s to break, and maneuvered to obtain a missile firing position on one of the MiG-21s. I obtained a boresight lock-on, interlocks in, went full system, kept the pipper on the MiG, and fired two AIM-7s in a ripple. One AIM-7 went ballistic. The other guided but passed behind the MiG and did not detonate. Knowing I was too close for further AIM-7 firing, I maneuvered to obtain AIM-9 firing parameters. The MiG-21 was maneuvering violently and firing position was difficult to achieve. I snapped two AIM-9s at the MiG and did not observe either missile. The MiG then reversed and presented the best parameter yet. I achieved a loud growl, tracked, and fired one AIM-9. From the moment of launch it was obvious that the missile was locked on. It guided straight for the MiG and exploded about 5–10 feet beneath his tailpipe.

Mikoyan Gurevich MiG-21PF in markings of the Vietnam People's Air Force, at the National Museum of the United States Air Force. (U.S. Air Force)
Mikoyan Gurevich MiG-21 in markings of the Vietnam People’s Air Force at the National Museum of the United States Air Force. (U.S. Air Force)

“The MiG then went into a series of frantic turns, some of them so violent that the aircraft snap-rolled in the opposite direction. Fire was coming from the tailpipe, but I was not sure whether it was normal afterburner or damage-induced. I fired the remaining AIM-9 at one point, but the shot was down toward the ground and did not discriminate. I followed the MiG as he turned southeast and headed for Phuc Yen. The aircraft ceased maneuvering and went in a straight slant for the airfield. I stayed 2,500 feet behind him and observed brilliant white fire streaming from the left side of his fuselage. It looked like magnesium burning with particles flaking off. I had to break off to the right as I neared Phuc Yen runway at about 2,000 feet, due to heavy, accurate, 85-mm barrage. I lost sight of the MiG at that point. Our number 3 saw the MiG continue in a straight gentle dive and impact approximately 100 yards south of the runway.”

Colonel Olds then took his flight to the target area and covered the last of the 355th TFW strike aircraft as they came off the target. Leading his flight to Hoa Lac airfield and dodging two SAMs on the way, he found five MiG-17s over that airfield.

“We went around with them at altitudes ranging from 1,500 to 6,000 feet, right over the aerodrome,” Olds reported. The F-4s ran low on fuel before any real engagements occurred, however, and were forced to break off the encounter.

— Aces and Aerial Victories: The United States Air Force in Southeast Asia 1965–1973, by R. Frank Futrell, William H. Greenhalgh, Carl Grubb, Gerard E. Hasselwander, Robert F. Jakob and Charles A. Ravenstein, Office of Air Force History, Headquarters USAF, 1976, Chapter II at Pages 51–53.

During this mission, Colonel Olds and Lieutenant Lefever flew McDonnell F-4C-21-MC Phantom II serial number 63-7668.

Colonel Robin Olds shot down a MiG-21 with an AIM-9 Sidewinder fired from this McDonnell F-4C-21-MC Phantom II, 63-7668, 4 May 1967. U.S. Air Force)
Colonel Robin Olds shot down a MiG-21 with this McDonnell F-4C-21-MC Phantom II, 63-7668, 4 May 1967. (U.S. Air Force)

© 2016, Bryan R. Swopes