NACA’s chief project test pilot for the Douglas X-3, Joe Walker, in the cockpit of the research aircraft, circa 1954-1956. (LIFE Magazine via Jet Pilot Overseas)
October 27, 1954: Between August 1954 and May 1956, Joseph A. Walker, the National Advisory Committee for Aeronautics’ chief project test pilot for the Douglas X-3 supersonic research aircraft, made twenty research flights in the “Stiletto.”
On the tenth flight, 27 October, Walker took the X-3 to an altitude of 30,000 feet (9,144 meters). With the rudder centered, he put the X-3 into abrupt left aileron rolls, first at 0.92 Mach and then at Mach 1.05. Both times, the aircraft violently yawed to the right and then pitched down. Walker was able to recover before the X-3 was completely out of control.
The Douglas X-3 during NACA flight testing, 1954-1956. (LIFE Magazine via Jet Pilot Overseas)
This was a new and little understood condition called inertial roll coupling. It was a result of the aircraft’s mass being concentrated within its fuselage, the gyroscopic effect of the turbojet engines and the inability of the wings and control surfaces to stabilize the airplane and overcome its rolling tendency. (Just two weeks earlier, North American Aviation’s Chief Test Pilot George S. Welch had been killed when the F-100A Super Sabre that he was testing also encountered inertial roll coupling and disintegrated.)
A post-flight inspection found that the X-3 had reached its maximum design load. The airplane was grounded for the next 11 months.
Unlike its predecessors, the Bell Aircraft Corporation’s X1 and and X-2 rocketplanes, the turbojet-powered Douglas X-3 took off under its own power. Here, its two Westinghouse J37 engines are stirring up the sand on Runway 35 at Rogers Dry Lake. (LIFE Magazine via jet Pilot Overseas)
The Douglas X-3, serial number 49-2892, was built for the Air Force and NACA to explore flight in the Mach 1 to Mach 2 range. It was radically shaped, with a needle-sharp nose, very long thin fuselage and small straight wings. Two X-3 aircraft had been ordered from Douglas, but only one completed.
The X-3 was 66 feet, 9 inches (20.345 meters) long, with a wing span of just 22 feet, 8.25 inches (6.915 meters). The overall height was 12 feet, 6.3 inches (3.818 meters). The X-3 had an empty weight of 16,120 pounds (7,312 kilograms) and maximum takeoff weight of 23,840 pounds (10,814 kilograms).
It was to have been powered by two Westinghouse J46 engines, but when those were unsatisfactory, two Westinghouse XJ34-WE-17 engines were substituted. This was an axial flow turbojet with an 11-stage compressor and 2-stage turbine. It was rated at 3,370 pounds (14.99 kilonewtons) of thrust, and 4,900 pounds (21.80 kilonewtons) with afterburner. The XJ34-WE-17 was 14 feet, 9.0 inches (4.496 meters) long, 2 feet, 1.0 inch (0.635 meters) in diameter and weighed 1,698 pounds (770 kilograms).
The X-3 had a maximum speed of 706 miles per hour (1,136 kilometers per hour) and a service ceiling of 38,000 feet (11,582 meters).
The X-3 was very underpowered with the J37 engines, and could just reach Mach 1 in a shallow dive. The X-3′s highest speed, Mach 1.208, required a 30° dive. It was therefore never able to be used in flight testing the supersonic speed range for which it was designed. Because of its design characteristics, though, it was very useful in exploring stability and control in the transonic range.
At one point, replacing the X-3’s turbojet engines with two Reaction Motors XLR-11 rocket engines was considered. Predictions were that a rocket-powered X-3 could reach Mach 4.2. However, with Mach 2 Lockheed F-104 becoming operational and North American Aviation’s X-15 hypersonic research rocketplane under construction, the idea was dropped. Technology had passed the X-3 by.
In addition to Douglas Aircraft test pilot Bill Bridgeman, the Douglas X-3 was flown by Air Force test pilots Lieutenant Colonel Frank Everest and Major Chuck Yeager and NACA pilot Joe Walker.
Joe Walker resumed flight testing the X-3 in 1955. Its final flight was 23 May 1956. After the flight test program came to an end, the X-3 was turned over to the National Museum of the United States Air Force, Wright-Patterson Air Force Base, Ohio.
NACA test pilot Joe Walker with the Douglas X-3. (LIFE Magazine via Jet Pilot Overseas)
Douglas X-3 49-2892. Rogers Dry Lake is in the background. (NASA)
20 October 1952: At Edwards Air Force Base, California, Douglas Aircraft Company test pilot William Barton (“Bill”) Bridgeman made the first test flight of the X-3 twin-engine supersonic research airplane. During a high-speed taxi test five days earlier, Bridgeman and the X-3 had briefly been airborne for approximately one mile over the dry lake bed, but on this flight he spent approximately 20 minutes familiarizing himself with the new airplane.
William Barton “Bill” Bridgeman, 1916–1968. (Loomis Dean/LIFE Magazine)
Bill Bridgeman had been a Naval Aviator during World War II, flying the Consolidated PBY Catalina and PB4Y (B-24) Liberator long range bombers with Bombing Squadron 109 (VB-109), “The Reluctant Raiders.”
Bridgeman stayed in the Navy for two years after the war, then he flew for Trans-Pacific Air Lines in the Hawaiian Islands and Southwest Airlines in San Francisco, before joining Douglas Aircraft Co. as a production test pilot. He checked out new AD Skyraiders as they came off the assembly line at El Segundo, California. He soon was asked to take over test flying the D-558-2 Skyrocket test program at Muroc Air Force Base (now, Edwards AFB.) With the Skyrocket, he flew higher—79,494 feet (24,230 meters)—and faster—Mach 1.88—than any pilot had up to that time.
Douglas X-3 parked on Rogers Dry Lake, 1956 (NASA)
The Douglas X-3, serial number 49-2892, was built for the Air Force and NACA to explore flight in the Mach 1 to Mach 2 range. It was radically shaped, with a needle-sharp nose, very long thin fuselage and small straight wings. The X-3 was 66 feet, 9 inches (20.345 meters) long, with a wing span of just 22 feet, 8.25 inches (6.915 meters). The overall height was 12 feet, 6.3 inches (3.818 meters). The X-3 had an empty weight of 16,120 pounds (7,312 kilograms) and maximum takeoff weight of 23,840 pounds (10,814 kilograms).
It was to have been powered by two Westinghouse J46 engines, but when those were unsatisfactory, two Westinghouse XJ34-WE-17 engines were substituted. This was an axial flow turbojet with an 11-stage compressor and 2-stage turbine. It was rated at 3,370 pounds (14.99 kilonewtons) of thrust, and 4,900 pounds (21.80 kilonewtons) with afterburner. The XJ34-WE-17 was 14 feet, 9.0 inches (4.496 meters) long, 2 feet, 1.0 inch (0.635 meters) in diameter and weighed 1,698 pounds (770 kilograms).
The X-3 had a maximum speed of 706 miles per hour (1,136 kilometers per hour) and a service ceiling of 38,000 feet (11,582 meters).
This view of the Douglas X-3 shows its very small wings and tail surfaces. (NASA)
The X-3 was very underpowered with the J34 engines and could just reach Mach 1 in a shallow dive. Its highest speed, Mach 1.208, required a 30° dive. The research airplane was therefore never able to be used in flight testing in the supersonic speed range for which it was designed. Because of its design characteristics, though, it became useful in exploring stability and control problems encountered in the transonic range.
Two X-3 aircraft had been ordered from Douglas, but only one completed.
In addition to Bill Bridgeman, the Douglas X-3 was flown by Air Force test pilots Major Chuck Yeager and Lieutenant Colonel Frank Everest, and NACA High Speed Flight Station research pilot Joseph A. Walker.
NACA flight testing began in August 1954. On the tenth flight, 27 October, Joe Walker put the X-3 into abrupt left aileron rolls at 30,000 feet (9,144 meters), first at 0.92 Mach and then at Mach 1.05. Both times, the aircraft violently yawed to the right and then pitched down.
This was a new and little understood condition called inertial roll coupling. It was a result of the aircraft’s mass being concentrated within its fuselage, the torque reactions and gyroscopic effect of the turbojet engines and the inability of the wings and control surfaces to stabilize the airplane and overcome its rolling tendency. (Just two weeks earlier, North American Aviation’s Chief Test Pilot George S. Welch had been killed when the F-100A Super Sabre that he was testing also encountered inertial roll coupling and disintegrated.) A post-flight inspection found that the X-3 had reached its maximum design load. The X-3 was grounded for the next 11 months.
Joe Walker resumed flight testing the X-3 in 1955. It’s last flight was 23 May 1956. After the flight test program came to an end, the X-3 was turned over to the National Museum of the United States Air Force, Wright-Patterson Air Force Base, Ohio.
Douglas X-3 49-2892 at the National Museum of the United States Air Force. (NASM)
Lieutenant Gordon L. Gray, Jr., United States Navy, with record-setting Douglas YA4D-1 Skyhawk, Bu. No. 137820, at Edwards Air Force Base, 15 October 1955. (Navy Pilot Overseas)
15 October 1955: At Edwards Air Force Base, California, Lieutenant Gordon L. (“Gordo”) Gray, Jr., United States Navy, set a Fédération Aéronautique Internationale (FAI) World Record For Speed Over a Closed Circuit of 500 Kilometers when he flew a pre-production Douglas Aircraft Company YA4D-1 Skyhawk light attack bomber, Bureau of Aeronautics serial number (Bu. No.) 137820, to an average speed of 1,118.7 kilometers per hour (695.128 miles per hour).¹
Douglas Aircraft Company YA4D-1 Skyhawk, Bu. No. 137820. (Navy Pilot Overseas)
The Douglas A4D-1 Skyhawk is a single-place, single-engine, delta-winged light attack bomber designed for operation from aircraft carriers. It is 39 feet, 4 inches (11.989 meters) long with a wingspan of 27 feet, 6 inches (8.382 meters) and overall height of 15 feet (4.572 meters). Its empty weight is 8,400 pounds (3,810.2 kilograms). It was powered by a Curtiss-Wright J65-W-2, a licensed-production version of the Armstrong Siddeley Sapphire axial flow turbojet engine, which had a 13-stage compressor and 2-stage turbine. It produced 7,200 pounds of thrust (32.03 kilonewtons).
The A4D was in production from 1956 to 1979. 2,960 one- and two-place aircraft were built. The Skyhawk remained in service with the United States Navy until 2003.
Lieutenant Gordon L. Gray, Jr., U.S. Navy (third from left) with the Douglas Aircraft Company YA4D-1 Skyhawk team at Edwards AFB, California, 15 October 1955. (Navy Pilot Overseas)
William Barton Bridgeman. (Photograph courtesy of Neil Corbett, Test and Research Pilots, Flight Test Engineers)
15 October 1952: At Edwards Air Force Base, California, Douglas Aircraft Company test pilot William Barton (“Bill”) Bridgeman, while conducting high speed taxi tests, took a short flight in the new Douglas X-3. The experimental airplane flew about one mile (1.6 kilometers) over the dry lake bed before touching down. The official first flight would come five days later on 20 October.
In his biography, The Lonely Sky, Bill Bridgeman discussed his concerns about taking on the new project:
Mock-up of the Douglas X-3 (U.S. Air Force) William B. Bridgeman with the Douglas X-3.
Then one morning Johnny called me to his office. “Bill, we would like you to take a look at the X-3. Maybe you would like to test her. She’s in the final stages over in Hangar Three. Go over and take a look at the mock-up. See what you think. . . ” On the ground floor in front of a door marked KEEP OUT. SECRET PROJECT MX656. . .
I climbed aboard. In order to get into the cockpit, the seat was mechanically lowered to the ground. There was a button to raise the elevator. It buzzed ominously as it very slowly lifted me into the nose. Visibility was extremely poor from her windows, they were faired-in exaggerations of the Skyrocket slits. It was impossible to see the ground. The thin, insecure looking wings were so far behind me that they were out of sight. It would take some weighing to decide whether or not I wanted to bet my life on the integrity of this ship. . .
I was afraid to take on this airplane. I was also afraid someone else would accept the challenge. And I was afraid that I would decide to accept it.
—The Lonely Sky,William Bridgeman with Jacqueline Hazard, Cassell and Company Limited, London, 1956, Chapter XXIII at Page 276–278.
The Douglas X-3, serial number 49-2892, was built for the Air Force and the National Advisory Committee for Aeronautics (NACA) to explore flight in the Mach 1 to Mach 2 range. It was radically shaped, with a needle-sharp nose, very long thin fuselage and small straight wings. The X-3 was 66 feet, 9 inches (20.345 meters) long, with a wing span of just 22 feet, 8.25 inches (6.915 meters). The overall height was 12 feet, 6.3 inches (3.818 meters). The X-3 had an empty weight of 16,120 pounds (7,312 kilograms) and maximum takeoff weight of 23,840 pounds (10,814 kilograms).
It was to have been powered by two Westinghouse J46 engines, but when those were unsatisfactory, two Westinghouse XJ34-WE-17 engines were substituted. This was an axial flow turbojet with an 11-stage compressor and 2-stage turbine. It was rated at 3,370 pounds (14.99 kilonewtons) of thrust, and 4,900 pounds (21.80 kilonewtons) with afterburner. The XJ34-WE-17 was 14 feet, 9.0 inches (4.496 meters) long, 2 feet, 1.0 inch (0.635 meters) in diameter and weighed 1,698 pounds (770 kilograms).
The X-3 had a maximum speed of 706 miles per hour (1,136 kilometers per hour) and a service ceiling of 38,000 feet (11,582 meters).
Three-view drawing of the Douglas X-3. (NASA)
The X-3 was very underpowered with the J34 engines, and could just reach Mach 1 in a shallow dive. The X-3′s highest speed, Mach 1.208, required a 30° dive. It was therefore never able to be used in flight testing the supersonic speed range for which it was designed.
The X-3 was prone to Inertial Roll Coupling, a newly discovered and very dangerous situation in which an aircraft goes out of control in all three axes. Because of its design characteristics—a very long, thin, fuselage, small wings and tail surfaces, and concentrated mass—the X-3 was very useful in exploring stability and control in the transonic range.
At one point, replacing the X-3’s turbojet engines with two Reaction Motors XLR-11 rocket engines was considered. Predictions were that a rocket-powered X-3 could reach Mach 4.2. However, with Mach 2 Lockheed F-104 becoming operational and North American Aviation’s X-15 hypersonic research rocketplane under construction, the idea was dropped. Technology had passed the X-3 by.
Two X-3 aircraft had been ordered from Douglas, but only one completed. In addition to Bill Bridgeman, the Douglas X-3 was flown by Air Force test pilots Major Chuck Yeager and Lieutenant Colonel Frank Everest, and NACA test pilot Joseph A. Walker.
After the flight test program came to an end in May 1956, the X-3 was turned over to the National Museum of the United States Air Force, Wright-Patterson Air Force Base, Ohio.
The Douglas X-3 in flight, just a few feet above the dry lake bed at Edwards AFB, California. (Cropped detail from a LIFE Magazine image at Jet Pilot Overseas)
Lieutenant Commander James B. Verdin, United States Navy. (J. R. Eyerman)
3 October 1953: Lieutenant Commander James B. Verdin, United States Navy, a test pilot assigned to NAS Patuxent River, Maryland, flew the second prototype of the Douglas Aircraft Company’s XF4D-1 Skyray, Bu. No. 124587, over a three kilometer course at the Salton Sea, California. Flying at approximately 150 feet (46 meters), Commander Verdin made four passes, with two in each direction. He set a new Fédération Aéronautique Internationale (FAI) World Record for Speed over a 3-kilometer course, averaging 1,211.75 kilometers per hour (752.95 miles per hour).¹
The surface of the Salton Sea, is 236 feet (72 meters) below Sea Level. The air temperature at the time of Verdin’s flight was 98.5 °F. (36.9 °C.). His four runs were measured at 1,200.691, 1,225.377, 1,200.656, and 1,222.294 kilometers per hour (746.075, 761.414, 746.053 and 759.498 miles per hour). The total elapsed time for the flight, from take off to landing at NAS El Centro, was 20 minutes, 25 seconds. The XF4D-1 burned 575 gallons (2,177 liters) of fuel.
Verdin had broken the record set 25 September 1953 by Michael J. Lithgow, chief test pilot for Vickers Supermarine, flying a Supermarine Swift F. Mk.4, WK198, at Castel Idris, Libya.²
In an interview with famed writer Bob Considine for his newspaper column, Verdin said,
“Douglas had its high priced help there at the course, and they iced my fuel for the Skyray while I took a look at the course from a Grumman Cougar,” he remembered. “They ice the fuel because that shrinks it and you can pack more in.
“We towed her out to the starting line to save the stuff. Didn’t even use blocks on the wheels after the engine was started. Just started rolling. I was in the air a little over a minute after the engine started, and headed for the measured course, 40 miles away.
“It was marked for me by smudge pots and burning tires, and orange-red markers to tell me when to turn off my afterburner, which eats fuel like crazy. About five miles short of the line I was doing 620 and turned on the afterburner. It gave me another hundred miles an hour right away, and I held her steady and low over the course. It doesn’t take long. . . about nine seconds for the just under two miles.”
—Bob Considine, On the Line—By Considine, International News Service, published in The Daily Review, Hayward, California, Vol. 62, No. 21, 20 October 1953, Page 14 at Columns 1–3
Douglas XF4D-1 Skyray Bu.No. 124587. (U.S. Navy)
The Douglas XF4D-1 Skyray was a single-place, single-engine delta-winged fighter powered by a turbojet engine. It had retractable tricycle landing gear and was to operate off of the U.S. Navy’s aircraft carriers as a high altitude interceptor. The Skyray was designed by the legendary Ed Heinemann, for which he was awarded the Collier Trophy in 1954. Two prototypes were built (Bu.Nos. 124586, 124587). It was a delta-winged aircraft, though the wingtips were significantly rounded.
The Douglas F4D-1 Skyray was 45 feet, 4¾ inches (13.837 meters) long, with a wingspan of 33 feet, 6 inches (10.211 meters) and overall height of 13 feet, 8 inches (4.166 meters). The empty weight was 16,024 pounds (7,268 kilograms) and maximum takeoff weight was 27,116 pounds (12,300 kilograms).
Originally built with Allison J35-A-17 turbojet engines, both prototypes later had a Westinghouse J40-WE-8 afterburning turbojet installed. The Skyray was equipped with the Westinghouse engine when it set the speed record. Production Skyrays used a Pratt & Whitney J57-P-8 afterburning turbojet.
The Westinghouse J40-W-8 was a single-shaft, axial-flow, afterburning turbojet engine with an 11-stage compressor and two-stage turbine. It produced 10,500 pounds of thrust (46.706 kilonewtons) at 7,600 r.p.m. The engine was 25 feet, 0 inches (7.620 meters) long, 3 feet, 4 inches (1.016 meters) in diameter and weighed 3,500 pounds (1,588 kilograms).
Douglas XF4D-1 Skyray, Bu.No. 124587. (U.S. Navy)
The F4D-1 was the first U.S. Navy fighter able to reach supersonic speeds in level flight. The production aircraft had a maximum speed of 722 miles per hour (1,162 kilometers per hour), and service ceiling of 55,000 feet (16.764 meters). Its rate of climb was 18,300 feet per minute (92.97 meters per second) and the maximum range was 1,200 miles (1,931 kilometers).
The Skyray was armed with four 20 mm Colt Mk 12 autocannon, with 65 rounds of ammunition per gun. It could also carry 2.75-inch FFAR rockets, four AIM-9 Sidewinder air-to-air missiles, or two 2,000 pound (1,588 kilogram) bombs.
The Douglas Aircraft Company built 420 F4D-1 Skyrays. They were in service with the U.S. Navy and U.S. Marine Corps from 1956 until 1964.
Douglas XF4D-1 Bu.No. 124587 as a flight test aircraft for General Electric, at Edwards Air Force Base, circa 1955. (U.S. Navy)
The record-setting XF4D-1 was transferred to General Electric in July 1955 and used to test GE’s J79 afterburning turbojet engine and the commercial CJ805.
XF4D-1 Bu. No. 124587 was returned to the Navy in May 1960. It is on display at the U.S. Navy Museum of Armament and Technology, NAWS China Lake, California.
Lieutenant Commander James B. Verdin, USN (1918–1955)
James Bernard Verdin was born at Miles City, Montana, 23 February 1918, the son of James Harris Verdin, a farmer, and Nellie Cambron Verdin.
He attended Abraham Lincoln High School in Council Bluffs, Iowa, graduating in 1937, then studied at Iowa State College, Ames, Iowa. He was a member of the Reserve Officers Training Corps (ROTC), and the Theta Chi (ΘΧ) fraternity.
In 1940, Verdin was employed by the Standard Varnish Works, in Chicago, Illinois. He registered for Selective Service (conscription) 16 October 1940. He was described as being 5 feet, 9 inches (1.75 meters) tall, and weighing 160 pounds (72.6 kilograms). He had black hair, brown eyes, and a dark complexion.
He entered the United States Navy as a Seaman, 2nd Class, 11 July 1941. His enlistment was terminated 7 January 1942 and he was accepted as an Aviation Cadet. He was assigned to NAS Corpus Christi, Texas, for flight training. Verdin was commissioned as an Ensign, 18 June 1942.
Miss Kathryn Jane Marschner
Ensign Verdin married Miss Kathryn Jane Marschner at St. Michael’s Church, Pensacola, Florida, 4 August 1942. The ceremony was officiated by Rev. W. J Cusik. They lived in Coronado, California, near NAS North Island. They had one child. They divorced in 1948. Later, he married his second wife, Miss Muriel Carolyn Larson. They had three children and lived in Brentwood, California.
He was promoted to Lieutenant (Junior Grade), 1 May 1943, and then promoted to Lieutenant, 1 July 1944.
During World War II, Lieutenant James Bernard Verdin, U.S.N., was a fighter pilot flying the Grumman F6F-5 Hellcat, assigned to VF-20 aboard USS Enterprise (CV-6). He was awarded the Navy Cross for extraordinary heroism at the Battle of Leyte Gulf, 25 October 1944:
The President of the United States of America takes pleasure in presenting the Navy Cross to Lieutenant James Bernard Verdin, United States Naval Reserve, for extraordinary heroism in operations against the enemy while service as a Pilot of a carrier-based Navy Fighter Plane in Fighting Squadron TWENTY (VF-20), attached to the U.S.S. ENTERPRISE (CV-6), on a strike against the Japanese Fleet during the Battle for Leyte Gulf on 25 October 1944, in the Philippine Islands. With complete disregard for his own personal safety and in the face of intense anti-aircraft fire, Lieutenant Verdin attacked and scored a direct bomb hit on an enemy battleship. His outstanding courage and determined skill were at all times inspiring and in keeping with the highest traditions of the United States Naval Service.
General Orders: Commander 1st Carrier Task Force Pacific: Serial 046. 31 January 1945
Grumman F6F Hellcats on the flight deck of USS Enterprise (CV-6), 30 October 1944. The aircraft carrier USS Belleau Wood (CVL-24) is burning on the horizon. (U.S. Navy)
Lieutenant Verdin flew more than 100 combat missions during World War II and the Korean War. In addition to the Navy Cross, Lieutenant Commander Verdin was awarded the Distinguished Flying Cross with one gold star, and the Air Medal with five gold stars.
Verdin resigned from the U.S. Navy 27 May 1954 and joined the Douglas Aircraft Company as a test pilot, June 1954.
While testing a Douglas YA4D-1 Skyhawk, Bu. No. 137815, 13 January 1955, Lieutenant Commander Verdin encountered violent vibrations during a high speed run near Victorville, California. He was forced to eject, but his parachute failed to open and he was killed. His body was not found until the following day, located 2½ miles from the crash site. Verdin was 37 years old.
During his career in the United States Navy, Lieutenant Commander Verdin had been awarded the Navy Cross, the Distinguished Flying Cross with one gold star (two awards), and the Air Medal with five gold stars (six awards). His remains were buried at Fort Rosecrans National Cemetery, San Diego, California.
Douglas Aircraft Company YA4D-1 Skyhawk, Bu. No. 137820, sister ship of Verdin’s Skyhawk. (Navy Pilot Overseas)
