Tag Archives: Transcontinental Speed Record

19 January 1937

Howard Hughes in the cockpit of the H-1 Racer, NX258Y, 19 January 1937. (LIFE Magazine)
Howard Hughes climbs out of the cockpit of the H-1 Racer, NX258Y, at Newark Metropolitan Airport, 19 January 1937. “Grimy from the smoke of his exhaust stacks the lanky pilot climbed out of his cramped cockpit and grinned.” (LIFE Magazine)

19 January 1937: Howard Robard Hughes, Jr., departed Union Air Terminal, Burbank, California, at 2:14 a.m., Pacific Standard Time (10:14 UTC) aboard his Hughes Aircraft Company H-1 Racer, NR258Y. He flew non-stop across the North American continent to Newark Metropolitan Airport, Newark, New Jersey, and arrived overhead at 12:42:25 p.m., Eastern Standard Time (17:42:25 UTC).

Hughes completed the 2,490-mile (4,007.3 kilometer) flight in 7 hours, 28 minutes, 25 seconds, at an average speed of 332 miles per hour (534 kilometers per hour). He broke the existing record, which he himself had set just over one year previously in a Northrop Gamma, by more than two hours.¹ (The 1937 flight is not recognized as an FAI record.)

Hughes H-1 NX258Y
Hughes H-1 NX258Y. (Hughes Aircraft Company)

The New York Times reported:

  All landplane distance speed records were broken yesterday by Howard Hughes, millionaire sportsman pilot, who reached Newark Airport 7 hours 28 minutes and 25 seconds after he took off from Los Angeles, Calif. He was forced to stay aloft until the runway at the field was clear and landed at 1:03 P.M. His average speed was 332 miles an  hour for the 2,490 miles he traveled.

     Grimy from the smoke of his exhaust stacks the lanky pilot climbed out of his cramped cockpit and grinned. In recounting his experiences on the flight he said that the skies were overcast all the way and he had to fly on top of the clouds . . .

     It was 2:14 o’clock in the morning and pitch dark when he opened the throttle at the Union Air Terminal at Burbank and released the 1,100 horsepower sealed in the fourteen cylinders of his supercharged Twin Row Wasp engine. The sleek gray and ble low-winged monoplane, designed and built under his own direction, staggered, accelerated and then literally vaulted into the air. Within a few seconds Hughes climbed into the low-hanging clouds and swung eastward . . .

     At 14,000 feet, at which altitude he flew most of the way, he passed over the clouds, set his course and leveled off. He throttled his engine back until it was delivering only 375 horsepower and hunched himself over his instrument panel . . .

     His arrival at Newark was unheralded and a surprise. It was thought that he was going to land at Chicago. The new United Air Lines extra-fare plane was loaded for its initial run and already had its door locked when the propeller whir of the hurling racer apparently made the buildings tremble from sound vibration as Hughes swept low across the field. William Zint of the Longines Watch Company, official timer for the National Aeronautic Association, noted the time. It was exactly 42 minutes and 25 seconds after noon.

     Hughes pulled up in a sweeping chandelle maneuver and circled. The United Air Liner was already on the runway when Hughes swung back toward the flaps on his wing to slacken speed for landing . . . and the plane settled fast toward the earth. Still the pilot had no signal from the control tower where the dispatchers act as traffic patrols at the busiest airport in the world. Hughes had to open his throttle again and cruise around the field for some time before the green light at last came on. The United plane was then well on its course toward Chicago. Hughes’s plane slid in over the airport boundary, dropped it’s retractable undercarriage and tail wheel and touched both wheels and tail wheel in a perfect three-point landing at 1:02:30 P.M. . . .

— Excerpted from an article in The New York Times, Wednesday, 20 January 1937, Page 1 at Columns 6 and 7.

After landing at Newark, Hughes told newspaper reporters, “I flew at 14,000 feet most of the way,” Hughes said, “with my highest speed 370 miles an hour. I used about 200 of the 280-gallon load. I am very tired—a bit shaky.”

[Richard W.] Palmer met Hughes at Newark Airport. The two men shook their heads at each other. “I knew she was fast,” Hughes told his chief engineer, “but I didn’t know she was that fast.”

Newark, N.J., Tuesday, Jan. 19.—(AP)

Howard Hughes with his H-1 Racer, NR258Y.
Howard Hughes with his H-1 Racer, NR258Y.

The Hughes H-1 (FAA records describe the airplane as a Hughes Model 1B, serial number 1) was a single-seat, single-engine low wing monoplane with retractable landing gear, designed by Richard W. Palmer. Emphasis had been placed on an aerodynamically clean design and featured flush riveting on the aluminum skin of the fuselage. The airplane is 27 feet, 0 inches long (8.230 meters) with a wingspan of 31 feet, 9 inches (9.677 meters) and height of 8 feet (2.438 meters). (A second set of wings with a span of 25 feet (7.6 meters) was used on Hughes’ World Speed Record ² flight, 13 September 1935.) The H-1 has an empty weight of 3,565 pounds (1,617 kilograms) and gross weight of 5,492 pounds (2,491 kilograms).

The H-1 was powered by an air-cooled, supercharged, 1,534.943-cubic-inch-displacement (25.153 liter) Pratt & Whitney Twin Wasp Jr., a two-row, fourteen-cylinder radial engine. Pratt & Whitney produced 18 civil and 22 military versions of the Twin Wasp Jr., in both direct drive and geared configurations, rated from 650 to 950 horsepower. It is not known which version powered the H-1, but various sources report that it was rated from 700 to 1,000 horsepower. The engine drove a two-bladed Hamilton Standard controllable-pitch propeller.

Hughes H-1 NX258Y at Hughes Airport, Culver City, California. (Hughes Aircraft Company)
Hughes H-1 NX258Y, left front quarter, at Hughes Airport, Culver City, California. (Hughes Aircraft Company)
Hughes H-1 NX258Y, right profile. (Hughes Aircraft Company)
Hughes H-1 NX258Y, right profile, at Hughes Airport, Culver City, California. (Hughes Aircraft Company)
Hughes  H-1 NX258Y. (Ray Wagner Collection, San Diego Air & Space Museum Archives)
The Hughes Aircraft Co. H-1 Racer, NR258Y at the Smithsonian Institution National Air and Space Museum. (NASM)
The Hughes Aircraft Co. H-1 Racer, NR258Y at the Smithsonian Institution National Air and Space Museum. (NASM)

¹ FAI Record File Number 13237: World Record for Speed Over a Recognized Course, 417.0 kilometers per hour (259.1 miles per hour)

² FAI Record File Number 8748: World Record for Speed Over a 3 Kilometer Course, 567.12 kilometers per hour (352.39 miles per hour)

© 2019, Bryan R. Swopes

14 January 1936

Hoard Hughes with his record-setting Northrop Gamma. (Unattributed)
Howard Hughes with the record-setting Northrop Gamma. (UNLV Special Collections)

14 January 1936: Flying a Northrop Gamma 2G, serial number 11, which he had leased from Jackie Cochran, Howard Robard Hughes, Jr., set a Fédération Aéronautique Internationale (FAI) World Record for Speed Over a Recognized Course (Los Angeles, California, to New York) in 9 hours, 26 minutes, 10 seconds, at an average speed of 417.0 kilometers per hour (259.1 miles per hour).¹ Most of the flight was made at altitudes of  15,000–18,000 feet (4,572–5,486 meters), and Hughes used supplemental breathing oxygen.

Howard Hughes climbs out of the Northrop Gamma at Newark, New Jersey. (UNLV Digital Collection)
Howard Hughes climbs out of the Northrop Gamma at Newark, New Jersey. (UNLV Digital Collection)
Howard Hughes is interviewed at Newark, New Jersey, 14 January 1936.

Jack Northrop had designed and built the Gamma as a long-range cargo and mail plane for Transcontinental and Western Air, Inc. The contract was cancelled, though, and several airplanes became available to other customers. Jackie Cochran purchased s/n 11, which had been completed 15 August 1934, and had it modified by Northrop as a two-place long-distance racer for the 1934 MacRobertson London-to-Australia air race, which she planned to fly with her friend Ted Marshall.

The length of the Gamma varied from 29’10” to 31’0″, depending on engine and cockpit configuration. The wingspan was 48’0″.

The Northrop Gamma 2G, NC13761, after modification to install a liquid-cooled Wright SGV1570F4 V-12 engine, 9 September 1934. (SDASM Archives)
The Northrop Corporation Gamma 2G, NC13761, after modification for the MacRobertson Race, 29 September 1934. (The Northrop Corporation)
The Northrop Gamma 2G, NC13761, after modification to install a liquid-cooled Wright SGV1570F4 V-12 engine. (SDASM Archives)

The Gamma’s original engine was replaced with a liquid-cooled, supercharged, 1,570.381-cubic-inch-displacement (25.734 liters) Wright Aeronautical Division Conqueror SGV1570F4 (also known as the Curtiss Conqueror), a DOHC 60° V-12 engine rated at 745 horsepower at Sea Level. The engine drove a two-bladed propeller. The Gamma had 7 fuel tanks: 3 in each wing and 1 in the fuselage. Total capacity was 486 gallons (1,840 liters) of gasoline and 29 gallons (110 liters)of lubricating oil. A second fuselage tank was later added, bring the total fuel capacity to 586 gallons (2,218 liters). The Gamma 2G had an empty weight of 4,727 pounds (2,144 kilograms) and a maximum gross weight of 8,037 pounds (3,646 kilograms). The modified airplane was inspected and a temporary commercial registration, NC13671, was approved 29 September 1934.

While being ferried to New York by Jackie and her new copilot, Royal Leonard, problems with the engine’s supercharger forced them to land in Arizona. Cochran continued east by airliner while Leonard and a Curtiss-Wright mechanic continued east in the Gamma. Flying on the night of 1 October 1934, a continuing problem with the supercharger forced them to make an off-field landing near Tucumcari, New Mexico, using light from dropped flares. The Gamma was seriously damaged and had to be returned to Northrop for repair.

Northrop Gamma 2G NX13761 after installation of the air-cooled Pratt & Whitney Twin Wasp, Jr. SA1-G 14-cylinder radial engine. (SDASM Archives)

The airplane’s temporary registration was suspended. A section of the wing and the forward lower half of the fuselage were replaced, provisions for installing a Pratt & Whitney radial engine were made, and the rear cockpit was removed. (Cochran’s plans for the MacRobertson Race had to be revised,² so she had the airplane modified for the Bendix Trophy Race.) The repairs and modifications were completed 30 November 1934.

Jackie Cochran’s Northrop Gamma NX13761 after radial engine installation, photographed at Clemenceau, near Cottonwood, Arizona, circa 1935. (Ruth Reinhold Aviation Collection, Arizona Memory Project RRA-AMP107)

The “re-modified” Gamma 2G was now powered by an air-cooled, supercharged, 1,534.943-cubic-inch-displacement (25.153 liters) Pratt & Whitney Twin Wasp Jr. SA1-G 14-cylinder radial engine with a three-bladed Hamilton Standard controllable-pitch propeller. The SA1-G was rated at 700 horsepower at 2,500 r.p.m. at 6,500 feet (1,981 meters). The engine could be ordered with a 3:2 or 4:3 gear reduction ratio.

Jackie Cochran flew the Gamma in the 1935 Bendix Trophy Race, but, approaching severe weather over the Grand Canyon, landed the airplane and did not finish the race.

The official ownership history of the Gamma is murky. The original application for a Department of Commerce Aeronautics Branch license specified the owner as The Northrop Corporation. On 4 January 1935, Northrop’s registration was cancelled by the Department of Commerce because, “Aircraft not inspected for relicensing.”

Jackie Cochran with the Northrop Gamma 2G, circa 1936. Photographed by Toni Frissell.

When Jackie Cochran requested registration in her name, she failed to submit a Bill of Sale with her application. After repeated written requests by the Bureau of Air Commerce to submit a bill of sale went unanswered, her application for a restricted registration for the airplane was cancelled, 9 January 1936. J Carroll Cone, Assistant Director of Air Commerce (Air Regulation) informed her in writing: “The status of this aircraft is unlicensed and unidentified, according to our records. Any operation thereof would be in violation of the Air Commerce Regulations and subject the offender to the civil penalty provided therefor.”

Finally, a Bill of Sale from The Northrop Corporation, dated 30 November 1935, was provided to the Aeronautics Bureau. It said that Northrop had sold the airplane to Cochran, “for and in consideration of ten dollars ($10.00)”.

Meanwhile, Howard Hughes had seen the Gamma and wanted to buy it. Jackie Cochran tells how Howard Hughes acquired the airplane:

One night about 11:30 I was exhausted in my hotel room and the telephone rang. . .

“Jackie,” the voice says, “this is Howard.”

“Howard who?” I say, still sleepy and getting frustrated.

“Howard Hughes,” the man says.

“Howard who?” I ask again.

“Howard Hughes,” he repeats.

. . . We argued about who he was a bit more. Finally, he says, “I want to buy your airplane.”

I’m thinking that this is an incredible conversation. “It’s not for sale, Howard,” I reply. “I’m going to fly it in the Bendix.”

“I don’t want to fly it in the Bendix,” he answers. “I want to fly it cross-continental.”

“So do I,” I say.

Howard Hughes and I negotiated over the Northrop Gamma for about four weeks. . . Howard wanted my Northrop so badly, but it would break my heart to consider handing over my rights to it. . . when he offered to rent it, with an option to buy, I caved in. . . .

Jackie Cochran: An Autobiography, by Jacqueline Cochran and Maryann Bucknum Brinley, Bantam Books, New York, 1987, at 152–153.

When Hughes took possession of the Gamma 2G, he had the Pratt & Whitney engine replaced with a 1,823.129 cubic-inch (29.785 liter) Wright Cyclone SGR-1820-G5 nine-cylinder radial engine, and a three bladed-Hamilton Standard constant-speed propeller with a diameter of 11 feet, 3 inches (3.429 meters). The engine used a bell-shaped cowling similar to that of Hughes’ H-1 Racer. The engine had a Normal Power rating of 830 horsepower at 2,100 r.p.m to 4,300 feet (1,311 meters), and 930 horsepower for Takeoff. This engine did not yet have government certification. Three additional fuselage tanks were installed, increasing the Gamma’s fuel capacity to 690 gallons. Hughes did not submit the Gamma for Department of Commerce inspection and licensing. It was not approved in the new configuration.

Jackie Cochran took the Gamma back from Hughes and had the Twin Wasp Jr. reinstalled, and submitted a new application for registration 31 March 1936. This was approved 28 April 1936, and the Gamma received a restricted registration, NR13761. It was damaged beyond repair after an emergency landing, 10 July 1936.

The Northrop Gamma 2G, NR13761, at Newark, New Jersey, 14 January 1936. (UNLV Libraries Digital Collection)

¹ FAI Record File Number 13237

² With Northrop unable to repair the airplane in time for the MacRobertson Race, at the last minute Jackie Cochran entered with a different airplane (a Granville Brothers Gee Bee R-6H).

© 2017, Bryan R. Swopes

2 January 1954

Brigadier General Willard W. Millikan, United States Air Force.
Brigadier General Willard W. Millikan, United States Air Force.
Colonel Willard W. Millikan, U.S. Air Force, in the cockpit of his F-86F Sabre, "Minuteman." (Unattributed)
Colonel Willard W. Millikan, U.S. Air Force, in the cockpit of his F-86F Sabre, “Minuteman.” (Associated Press)

2 January 1954: Colonel Willard W. Millikan, United States Air Force, flew a North American Aviation F-86F-25-NH Sabre, 51-13393, named Minuteman, from Los Angeles International Airport to New York in 4 hours, 6 minutes, 16 seconds,¹ averaging 595.91 mph (959.02 kilometers per hour).

Colonel Millikan departed Los Angeles International Airport at 10:10:55 a.m., Eastern Standard Time, and flew most of the route at 40,000 feet (12,192 meters). After expending the fuel in his two 670-gallon (2,536 liter) wing tanks, he dropped them over the southwest desert.

The Sabre crossed over Colorado Springs, Colorado, at 11:28 a.m., EST. At 12:26 p.m., Millikan made a refueling stop at Offutt Air Force Base, Omaha, Nebraska (OFF), where a waiting 20-man crew attached two full wing tanks to the Sabre and he was airborne after only 6 minutes, 28 seconds on the ground.

(The Des Moines Register, Vol. 105, No. 197, Sunday, 3 January 1954, Section 4, Page 3-L, Columns 3–6)

Cruising at 40,000 feet (12,192 meters), he reported 10 miles (16 kilometers) north of Youngstown, Ohio, at 1:47 p.m. EST. Millikan dropped the second set of tanks over Lake Michigan.

Colonel Millikan crossed the finish line at Floyd Bennett Field at 2:19 p.m. EST. His engine flamed out as the aircraft ran out of fuel at 5,000 feet (1,524 meters). Colonel Millikan made a “dead stick” landing at Idlewild Airport, New York City (IDL) at 2:23 p.m., EST.

“My tank was dry,” he said. “I had to glide in. When I arrived on the ground I did not have a drop of fuel.” After refueling at Idlewild, Colonel Millikan took off at 3:57 p.m., and flew back to Mitchel Field, landing there at 4:07 p.m., EST.

Lieutenant Willard W. Millikand, 336th Fighter Squadron, 4th Fighter Group, 8th Air Force, U.S. Army Air Force, stands in the cockpit of his Republic P-47C Thunderbolt 41-6180. (American Air Museum in Britain, Object Number UPL 18911)
Lieutenant Willard W. Millikan, 336th Fighter Squadron, 4th Fighter Group, 8th Air Force, U.S. Army Air Forces, stands in the cockpit of his Republic P-47C-2-RE Thunderbolt 41-6180. (American Air Museum in Britain, Object Number UPL 18911)

Willard Wesley “Millie” Millikan was a fighter ace in World War II, officially credited with having destroyed enemy 13 Messerschmitt Bf-109s and Focke-Wulf Fw-190s.

Millie Millikan was born 4 December 1919 at Hamburg, Iowa. He was the second of five children of John Reily Millikan, a farm laborer, and Hattie Mae Moore Millikan. After graduating from high school, Millikan studied at the Nebraska State Teachers College at Peru, in Peru, Nebraska.

Willard W. Millikan enlisted as an Aviation Cadet in the Air Corps, United States Army, 16 August 1941, at Fort Leavenworth, Kansas. He had brown hair and blue eyes, was 6 feet, 0 inches (1.829 meters) tall and weighed (161 pounds (73 kilograms).

After failing his flight checks as an Aviation Cadet, he went to England and joined the Royal Air Force, serving as a Flying Sergeant in the No. 133 Squadron (one the three Eagle Squadrons) and piloting Hawker Hurricanes and Supermarine Spitfires.

While stationed in England, Captain Millikan married Miss Ruby Samantha Wesson. They would later have a daughter, Patricia.

After the United States entered the war, Millikan was transferred to the U.S. Army Air Forces, and commissioned as a second lieutenant. Millikan served with the 4th Fighter Group and was eventually promoted to the rank of captain. He commanded the 336th Fighter Squadron and flew the Republic P-47C Thunderbolt and North American Aviation P-51B Mustang.

Lieutenant Millikan’s Republic P-47C-2-RE Thunderbolt 41-6180, “Missouri Mauler.” (American Air Museum in Britain, Object Number UPL 14289)

On 22 April 1944, during a 25-minute air battle, Millikan shot down four Messerschmitt Bf 109s with just 666 rounds of ammunition from his Mustang’s four .50-caliber machine guns.

On 30 May 1944, he had to bail out of his North American Aviation P-51B-15-NA Mustang, 43-24769, Missouri Mauler, near Wittenberg, Germany, after colliding with his wingman, Lieutenant Sam Young, who was evading anti-aircraft fire.

Captain Millikan’s North American Aviation P-51B-15-NA Mustang 43-24769, “Missouri Mauler.” (American Air Museum in Britain, Object Number UPL 21818)

Captain Millikan was captured and held as a prisoner of war. He later escaped and returned to friendly lines.

Major Millikan was released from active duty in 1946. He then joined the District of Columbia Air National Guard. In civilian life he worked for the the Norair Division of Northrop Corporation, and the aviation products division of the Goodyear Tire and Rubber Company.

Millikan served during the Korean War, flying the Republic F-84 Thunderjet fighter bomber. At the time of his record-setting flight, he was commanding officer of the 113th Fighter Interceptor Wing, District of Columbia Air National Guard.

Major General Willard W. Millikan, United States Air Force, was awarded the Distinguished Service Cross, Silver Star, Legion of Merit, Distinguished Flying Cross with one silver oak leaf cluster (six awards), Air Medal with three bronze oak leaf clusters (four awards), and the Purple Heart.

He died at Alexandria, Virginia, 20 October 1978 at the age of 59 years. Cremated, his ashes were scattered over England.

Morth American Aviation F-86F-25-NH Sabre, Minuteman, right profile. (Million Monkey Theater)
North American Aviation F-86F-25-NH Sabre 51-13393, Minuteman, right profile. (Million Monkey Theater)

The North American Aviation F-86 was a single-seat, single-engine day fighter designed by Edgar Schmued and the same team at North American that designed the World War II P-51 Mustang fighter. The F-86F was the third variant, with improvements over the earlier F-86A and F-86E. Colonel Millikan’s Minuteman was a Block 25 F-86F Sabre built at Columbus, Ohio. The Sabre was the first fighter to incorporate swept wings, which improved flight at high subsonic speed by reducing aerodynamic drag and delaying the onset of compressibility effects. The leading edges of the wings and tail surfaces were swept 35° based on captured German technical data and extensive wind tunnel testing.

The F-86F was 37 feet, 6.5 inches (11.443 meters) long with a wingspan of 37 feet, 1.4 inches (11.313 meters) and overall height of 14 feet, 1 inch (4.293 meters). Its empty weight was 10,890 pounds (4,939.6 kilograms) and the maximum takeoff weight was 20,357 pounds (9,233.8 kilograms).

The F-86F was powered by a General Electric J47-GE-27 single-shaft axial-flow turbojet engine. The engine had a 12-stage compressor, 8 combustion chambers, and single-stage turbine. It produced 5,910 pounds of thrust (26.289 kilonewtons) at 7,950 r.p.m. (5 minute limit).

A General Electric J47-GE-27 turbojet engine on display at the National Museum of the United States Air Force. The airplane in the background is a North American Aviation RF-86F Sabre, 52-4492. (U.S. Air Force)

Minuteman was one of the first Block 25 fighters built with the “6–3 wing,” which deleted the leading edge slats of the earlier variants, and moved the wings’ leading edges forward 6 inches (15.24 centimeters) at the root and 3 inches (7.62 centimeters) at the tip. A boundary layer fence was also added. This change increased the Sabre’s maximum speed to 695 miles per hour (1,118.49 kilometers per hour) at Sea Level and improved high altitude maneuvering. This came with a 16 mile per hour (25.75 kilometers per hour) increase in the stall speed, to 144 miles per hour (231.75 kilometers per hour). The service ceiling with this wing was 48,000 feet (14,630 meters).

The F-86F-25 carried 437 gallons (1,654.2 liters) of fuel internally and could carry two 200-gallon (757.1 liter) drop tanks under the wings. Maximum range was 1,525 miles (2,454.25 kilometers).

The F-86A, E and F Sabres were armed with six air-cooled Browning AN-M3 .50-caliber aircraft machine guns with 1,602 rounds of ammunition.

6,233 F-86 Sabres were built by North American at Inglewood, California and Columbus Ohio. Another 521 were assembled by Fiat and Mitsubishi. 1,815 CL-13 Sabres were built by Canadair, and 115 CA-26 and CA-27 Sabres by Commonwealth Aircraft Corporation in Australia. Total production for all types and manufacturers was 8,684.

¹ In an e-mail, Mr. A.W. Greenfield, Director, Contests and Records, National Aeronautic Association, confirmed Colonel Millikan’s transcontinental speed record was certified by the N.A.A. and stated that the time was adjusted.

North American Aviation F-86F Sabre, circa 1955. (U.S. Air Force)

© 2018, Bryan R. Swopes

15 August 1962

An American Airlines Boeing 707-023B Astrojet (720B) at Los Angeles International Airport, 26 December 1962. (Photograph courtesy of Jon Proctor)
An American Airlines Boeing 707-023B Astrojet (720B) at Los Angeles International Airport, 26 December 1962. (Photograph courtesy of Jon Proctor)

15 August 1962: American Airlines’ Captain Eugene M. (“Gene”) Kruse set two National Aeronautic Association Class C-1 records for Speed Over a Commercial Air Route, East to West Transcontinental, when he flew a Boeing 720B Astrojet from New York to Los Angeles, 2,474 miles (3,981.5 kilometers), in 4 hours, 19 minutes, 15 seconds, at an average speed of 572.57 miles per hour (921.46 kilometers per hour). 61 years later, these records still stand.

Screen Shot 2015-01-02 at 12.22.27The National Aeronautic Association has placed Captain Kruse’s records on its “Most Wanted” list: long-standing flight records that it would like to see challenged. Rules require that a new record exceed the old by at least a 1% margin. The performance needed to establish a new record would be 578.30 miles per hour (930.68 kilometers per hour).

The Boeing 720 was a variant of the Model 707, intended for short to medium range flights. It had 100 inches (2.54 meters) removed from the fuselage length and improvements to the wing, decreasing aerodynamic drag.

The Boeing 720 was operated by a flight crew of four and could carry up to 149 passengers. It was 136 feet, 2 inches (41.25 meters) long with a wingspan of 130 feet, 10 inches (39.90 meters) and overall height of 41 feet, 7 inches (12.65 meters). The airplane had an empty weight of 103,145 pounds (46,785 kilograms) and Maximum Takeoff Weight of 220,000 pounds (100,800 kilograms).

The Boeing 720 was powered by four Pratt & Whitney Turbo Wasp JT3C-7 turbojet engines, a civil variant of the military J57 series. The 720B was equipped with the more efficient P&W JT3D-1 turbofan engines. The JT3C-7 was a “two-spool” axial-flow engine with a 16-stage compressor (9 low- and 7 high-pressure stages), 8 combustion tubes, and a 3-stage turbine (1 high- and 2 low-pressure stages). It was rated at 12,030 pounds of thrust (53.512 kilonewtons) for takeoff. The JT3D-1 was a dual axial-flow turbofan engine, with a 2-stage fan section 13-stage compressor (6 low- and 7 high pressure stages), 8 combustion chambers and a 4-stage turbine (1 high- and 3 low-pressure stages). This engine was rated at 14,500 pounds of static thrust (64.499 kilonewtons) at Sea Level, and 17,000 pounds (75.620 kilonewtons), with water injection, for takeoff (2½ minute limit). Almost half of the engine’s thrust was produced by the fans. Maximum engine speed was 6,800 r.p.m. (N1) and 10,200 r.p.m. (N2). It was 11 feet, 4.64 inches (3.471 meters) long, 4 feet, 5.00 inches (1.346 meters) wide and 4 feet, 10.00 inches (1.422 meters) high. It weighed 4,165 pounds (1,889 kilograms). The JT3C could be converted to the JT3D configuration during overhaul.

The maximum cruise speed was 611 miles per hour (983 kilometers per hour) and maximum speed was 620 miles per hour (1,009 kilometers per hour). Range at at maximum payload was 4,370 miles (7,033 kilometers).

Boeing built 154 720 and 720B airliners from 1959 to 1967.

The last flight of a Boeing 720 was on 9 May 2012, when a 720B aircraft used by Pratt and Whitney Canada as a test aircraft was placed in the National Air Force Museum of Canada at Trenton, Ontario.

© 2018, Bryan R. Swopes