Medal of Honor: Captain Lance Peter Sijan, United States Air Force

Aviation, , , , , , , , , ,
1st Lieutenant Lance Peter Sijan, United States Air Force, with a McDonnell F-4C Phantom II. (U.S. Air Force/Milwaukee Independent)

9 November 1967: First Lieutenant Lance Peter Sijan, United States Air Force, was assigned as the Weapons System Officer of AWOL 01, a McDonnell F-4C-23-MC Phantom II, serial number 64-0751. The aircraft commander was Lieutenant Colonel John William Armstrong (USMA ’49), commanding officer of the 480th Tactical Fighter Squadron.

AWOL 01 was the lead ship of a two-aircraft strike against the Ho Chi Minh Trail where it crossed a small river at Ban Loboy, Laos. The flight departed Da Nang Air Base at 2000 hours. At 2045 hours, AWOL 01 was making a second low pass over the target when it was enveloped in a ball of fire. The Phantom entered a steep climb, reaching approximately 10,000 feet (3,048 meters), then nosed over and plunged straight into the ground. (Sources vary, stating that 64-0751 had been hit by ground fire, a surface-to-air-missile, or that its bombs had detonated prematurely immediately after release.)

The red X shows the location where AWOL 01 was lost, just southwest of the Laos/Vietnam border. (Together We Served)

Lieutenant Sijan was able to eject. It is not known if Colonel Armstrong was able to escape the doomed fighter. He was not seen or heard from again.

Sijan was severely injured, suffering a fractured skull, a broken right wrist and injured hand, and a compound fracture of his left leg. For two days, he lapsed in and out of consciousness. Then on 11 November, he was able to make radio contact with fighters overhead.

Lockheed HC-130P Combat King refuels a Sikorsky HH-3E Jolly Green Giant with Douglas A-1E and A-1H Skyraiders, SEA 1968. (U.S. Air Force)

A rescue operation was mounted, eventually involving more than 100 aircraft. Nine aircraft were damaged by enemy ground fire, and another, a Douglas A-1 Skyrader, was shot down. (It’s pilot was rescued.) An Air Force rescue helicopter, a Sikorsky HH-3E Jolly Green Giant, call sign JOLLY GREEN 15, was in radio contact with Sijan and located his approximate position. Sijan reported that he the helicopter in sight and requested that they hold their position and lower the jungle penetrator. Sijan said that he would crawl to it, and specifically said that they should not insert a pararescueman because enemy soldiers were in the immediate area. The helicopter held the hover over the triple canopy jungle for 33 minutes but never saw the injured pilot. He was not heard from again. Eventually, the rescue operation was called off.

Lance Sijan moved through the jungle by crawling. He was able to evade capture for six weeks before, unconscious, he was found by North Vietnamese soldiers. Taken to a camp near the Ban Karai Pass,

Sijan waited until a single soldier was left to guard him. He lured the guard close, then overcame him and rendered him unconscious with a left-handed chop to the base of the skull. He tied the guard’s shirt around his swollen leg, took his carbine, and crawled into the jungle.

     He was recaptured within half a day.

—”The Courage of Lance Sijan,” by John T. Correll, AIR FORCE Magazine, July 2004, Page 54

Sijan was eventually take to the Hỏa Lò Prison—the infamous Hanoi Hilton. He had never received medical treatment for his injuries. During his ordeal he lost more than 100 pounds (45 kilograms). He was subject to interrogation, torture and isolation. He was very ill and by mid-January was suffering from pneumonia. His captors removed him from his cell on 18 January 1968. He was not seen by his fellow prisoners of war after that date. It was reported that he died on 22 January 1968. Lance Peter Sijan was just 25 years old.
Medal of Honor (Detail from a photograph by Mr. Steve White)

          The President of the United States of America, authorized by Act of Congress, March 3, 1863, has awarded in the name of The Congress, the MEDAL OF HONOR posthumously to

CAPTAIN LANCE P. SIJAN

UNITED STATES AIR FORCE

for conspicuous gallantry and intrepidity in action at the risk of his life above and beyond the call of duty:

          While on a flight over North Vietnam on 9 November 1967, Captain Sijan ejected from his disabled aircraft and successfully evaded capture for more than six weeks. During this time, he was seriously injured and suffered from shock and extreme weight loss due to lack of food. After being captured by North Vietnamese soldiers, Captain Sijan was taken to a holding point for subsequent transfer to a Prisoner of War camp. In his emaciated and crippled condition, he overpowered one of his guards and crawled into the jungle, only to be recaptured after several hours. He was then transferred to another prison camp where he was kept in solitary confinement and interrogated at length. During interrogation, he was severely tortured; however, he did not divulge any information to his captors. Captain Sijan lapsed into delirium and was placed in the care of another prisoner. During his intermittent periods of consciousness until his death, he never complained of his physical condition, and on several occasions, spoke of future escape attempts. Captain Sijan’s extraordinary heroism and intrepidity above and beyond the call of duty at the cost of his life are in keeping with the highest traditions of the United States Air Force and reflect great credit upon himself and the Armed Forces of the United States.

/s/ Gerald R. Ford

Hỏa Lò Prison, the “Hanoi Hilton. (U.S. Air Force)
Lance P. Sijan, (1960 Oracle)

Lance Peter Sijan was born 13 April 1942 at Milwaukee, Wisconsin. He was the first of three children of Sylvester Sijan and Jane A. Attridge Sijan. Lance attended Bay View High School in Milwaukee. He was interested in science and art. He played on the varsity basketball, football, swimming and track teams, and was a member of the science club, foreign language and art clubs. Sijan was chosen to speak at the school’s graduation ceremony.

Cadet 4th Class, Sijan, L.P., 1961 (U.S. Air Force)

After finishing high school, Sijan enlisted in the United States Air Force as an Airman, 3rd Class. To improve his education, Airman Sijan was sent to the Naval Academy Preparatory School at Newport, Rhode Island. Completing the one-year course, now-Airman 2nd Class Sijan was appointed as a cadet at the United States Air Force Academy, Colorado Springs, Colorado.

Sports, academics

While on summer leave from the Academy, on 27 July 1964, Sijan and his younger brother, Marc F. Sijan, were sailing on Lake Weyauwega, Wisonsin, when a gust of wind capsized their boat. Thrown into the water, they unsuccessfully attempted to right the small craft, They were eventually rescued by a motorboat driven by their father.

Local automobile dealerships in Colorado Springs offered special pricing on new cars to Air Force Academy cadets. The Chevrolet Corvette was a popular choice. For his first class (senior) year, Sijan ordered a 1965 Corvette roadster. The car was painted Roman Red and had a white interior. It was powered by a 326.726-cubic-inch (5.354 liter) L75 small block V-8 engine rated at 300 horsepower, with a 4-speed transmission. He picked the car up at the Corvette assembly plant in St. Louis, Missouri.

Lance Sijan with his red 1965 Chevrolet Corvette. (Hemmings)

Cadet 1st Class Sijan graduated from the Air Force Academy with a bachelor of science degree and was commissioned a Second Lieutenant, United States Air Force, 9 June 1965.

Lieutenant Sijan was sent to Laredo Air Force Base, Texas, for undergraduate pilot training. Awarded his pilot’s wings in November 1966, Sijan was next assigned to the 431st Tactical Fighter Squadron at George Air Force Base in California, for Combat Crew Training and transition to the F-4C and F-4D Phantom II. In July 1967, he was transferred to the 480th Tactical Fighter Squadron, 366th Tactical Fighter Wind (“Gunfighters) based at DaNang, Republic of Vietnam.

480th Tactical Fighter Squadron pilots, circa 1967. Lieutenant Lance P. Sijan in seated in the front row, fourth from the left. Lieutenant Colonel John W. Armstrong, squadron commander, is standing in the second row, tenth from left, near center. The aircraft is McDonnell F-4C-23-MC Phantom II 64-0759, assigned to the 366th Tactical Fighter Wing commander, Colonel Bud Kaldy.. (Together We Served)

For his actions in combat 22 August 1967, Lieutenant Sijan was awarded the DIstinguished Flying Cross. His citation reads:

The President of the United States of America, authorized by Act of Congress, July 2, 1926, takes pleasure in presenting the Distinguished Flying Cross to First Lieutenant Lance Peter Sijan (AFSN: AF-16419378/F-80654/3537K), United States Air Force, for extraordinary achievement while participating in aerial flight as the Pilot of an F-4C “Phantom II” tactical jet fighter over North Vietnam on 22 August 1967. On that date, Lieutenant Sijan voluntarily risked his life in striking a heavily defended storage area. Despite heavy ground fire, he participated in multiple passes to deliver flares and ordnance directly on the target. Undaunted by darkness, treacherous terrain, marginal weather, and determined defenses, Lieutenant Sijan dealt a telling blow to the hostile forces by denying them vital war material and petroleum products. The professional competence, aerial skill, and devotion to duty displayed by Lieutenant Sijan reflect great credit upon himself and the United States Air Force.

Outside of the Hanoi Hilton, nothing was known of Lieutenant Sijan. He had not been heard from since 11 November 1967. Classified as Missing in Action (MIA), Sijan was promoted to the rank of Captain, U.S. Air Force, 13 June 1968.

Captain Sijan’s remains returned to the United States on 13 March 1974. Once positively identified, on 23 April 1974, his status was changed to Killed in Action (KIA).

In a ceremony at The White House, 4 March 1976, Gerald R. Ford, 38th President of the United States of America, presented the Medal of Honor to Sijan’s parents.

Captain Lance Peter Sijan is the only graduate of the United States Air Force Academy to have been awarded the Medal of Honor.

Lance Sijan’s USAFA class ring.

© 2019, Bryan R. Swopes

9 November 1967, 12:00:01.263 UTC, T plus 0.263

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Apollo 4 Saturn V (AS-501) on the launch pad at sunset, the evening before launch, 8 November 1967. (NASA)
Apollo 4 Saturn V (AS-501) on the launch pad at sunset, the evening before launch, 8 November 1967. (NASA)

9 November 1967: The first flight of a Saturn V took place when the unmanned Apollo 4/Saturn V (AS-501) was launched from Pad 39A at the Kennedy Space Center, Cape Canaveral, Florida. The rocket lifted off at 12:00:01.263 UTC.

AS-501 consisted of the first Saturn V launch vehicle, SA-501, with Apollo Spacecraft 017 (a Block I vehicle with Block II upgrades), and included the Launch Escape Tower, Command Module, Service Module, Lunar Module Adapter, and Lunar Module Test Article LTA-10R).

The Saturn V rocket was a three-stage, liquid-fueled heavy launch vehicle. Fully assembled with the Apollo Command and Service Module, it stood 363 feet, 0.15 inches (110.64621 meters) tall, from the tip of the escape tower to the bottom of the F-1 engines. The first and second stages were 33 feet, 1.2 inches (10.089 meters) in diameter. Fully loaded and fueled the rocket weighed 6,200,000 pounds (2,948,350 kilograms).¹ It could lift a payload of 260,000 pounds (117,934 kilograms) to Low Earth Orbit.

The first stage was designated S-IC. It was designed to lift the entire rocket to an altitude of 220,000 feet (67,056 meters) and accelerate to a speed of more than 5,100 miles per hour (8,280 kilometers per hour). The S-IC stage was built by Boeing at the Michoud Assembly Facility, New Orleans, Louisiana. It was 138 feet (42.062 meters) tall and had an empty weight of 290,000 pounds (131,542 kilograms). Fully fueled with 203,400 gallons (770,000 liters) of RP-1 and 318,065 gallons (1,204,000 liters) of liquid oxygen, the stage weighed 5,100,000 pounds (2,131,322 kilograms). It was propelled by five Rocketdyne F-1 engines, producing 1,522,000 pounds of thrust, each, for a total of 7,610,000 pounds of thrust at Sea Level.² These engines were ignited seven seconds prior to lift off and the outer four burned for 168 seconds. The center engine was shut down after 142 seconds to reduce the rate of acceleration. The F-1 engines were built by the Rocketdyne Division of North American Aviation at Canoga Park, California.

A Rocketdyne F-1 engine is being installed on a Saturn S-IC first stage. (NASA)

The S-II second stage was built by North American Aviation at Seal Beach, California. It was 81 feet, 7 inches (24.87 meters) tall and had the same diameter as the first stage. The second stage weighed 80,000 pounds (36,000 kilograms) empty and 1,060,000 pounds loaded. The propellant for the S-II was liquid hydrogen and liquid oxygen. The stage was powered by five Rocketdyne J-2 engines, also built at Canoga Park. Each engine produced 232,250 pounds of thrust, and combined, 1,161,250 pounds of thrust.³

The Saturn V third stage was designated S-IVB. It was built by Douglas Aircraft Company at Huntington Beach, California. The S-IVB was 58 feet, 7 inches (17.86 meters) tall with a diameter of 21 feet, 8 inches (6.604 meters). It had a dry weight of 23,000 pounds (10,000 kilograms) and fully fueled weighed 262,000 pounds. The third stage had one J-2 engine and also used liquid hydrogen and liquid oxygen for propellant.⁴ The S-IVB would place the Command and Service Module into Low Earth Orbit, then, when all was ready, the J-2 would be restarted for the Trans Lunar Injection.

Eighteen Saturn V rockets were built. They were the most powerful machines ever built by man.

Apollo 4 Saturn V AS-501 lifts off at 12:00:01 UTC, 9 November 1967. (NASA)
Apollo 4 Saturn V (AS-501) lifts off at 12:00:01 UTC, 9 November 1967. (NASA)

¹ The AS-501 total vehicle mass at First Motion was 6,137,868 pounds (2,784,090 kilograms).

²  Post-flight analysis gave the total thrust of AS-501’s S-IC stage as 7,728,734.5 pounds of thrust (34,379.1 kilonewtons).

³ Post-flight analysis gave the total thrust of AS-501’s S-II stage as 1,086,396 pounds of thrust (4,832.5 kilonewtons).

⁴ Post-flight analysis gave the total thrust of AS-501’s S-IVB stage as 222,384 pounds of thrust (989.2 kilonewtons) during the first burn; 224,001 pounds (996.4 kilonewtons) during the second burn.

© 2017, Bryan R. Swopes

9 November 1962

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McKAY, John B. (Jack) with X-15 56-6672, 13 March 1964 9 November 1962: Flight 74 of the X-15 Program was the Number Two aircraft’s 31st flight. X-15 56-6671 was carried aloft by Balls 8, the Boeing NB-52B Stratofortress, 53-008, for launch over Mud Lake, Nevada. NASA test pilot John Barron (“Jack”) McKay was to take the rocketplane to 125,000 feet at Mach 5.5 to investigate the stability and handling of the X-15 with the lower half of the ventral fin removed, and to investigate aerodynamic boundary layer phenomena.

North American Aviation X-15 56-6671 under the right wing of a B-52 Stratofortress at 45,000 feet. (NASA)
North American Aviation X-15 56-6671 under the right wing of a B-52 Stratofortress at 45,000 feet. (NASA)

The B-52 mothership dropped Jack McKay and the X-15 right on schedule at 10:23:07.0 a.m., local time, from an altitude of 45,000 feet (13,716 meters) and speed of approximately 450 knots (833 kilometers per hour). McKay advanced the throttle to ignite the Reaction Motors XLR99-RM-1 rocket engine. It fired immediately but when McKay advanced the throttle for the full 57,000 pounds of thrust, the engine remained at just 30%.

The X-15 could have flown back to Edwards Air Force Base, about 200 miles (320 kilometers) to the south, but with the engine not responding to the throttle, it was uncertain that it would continue running. The decision was made to make an emergency landing at Mud Lake.

Having reached a peak altitude of 53,950 feet (16,444 meters) and Mach 1.49 (1,109 miles per hour/1,785 kilometers per hour), Jack McKay continued to circle the lake burning off propellants as he lost altitude. The engine was shut down at 70.5 seconds. McKay positioned the aircraft for landing as he continued to dump unused propellant and liquid oxygen, but a considerable amount remained on board.

As he neared touchdown, he tried to lower the flaps but they did not deploy. The X-15 touched down on the dry lake bed at 296 miles per hour (476.4 kilometers per hour), 66 miles per hour (106 kilometers per hour) faster than normal.

Duration of the flight from air launch to touchdown was 6 minutes, 31.1 seconds.

The high speed and extra weight caused the X-15’s rear skids to hit harder than normal. When the nose wheels hit, a rebound effect placed even higher loads on the rear struts. At the same time, with the elevators in an extreme nose-up position, the higher aerodynamic loads pushed the skids deeper into the lake bed. This higher loading caused the left rear strut to collapse. The X-15 rolled to the left and the left elevator dug into the lake bed. This caused the aircraft to start sliding to the left. Jack McKay jettisoned the canopy and as the right wing tip dug into the surface, the X-15 flipped over and came to rest upside down.

A Piasecki H-21 rescue helicopter lands near the overturned X-15 at Mud Lake, 9 November 1961. (NASA)
A Piasecki H-21 rescue helicopter lands near the overturned X-15 at Mud Lake, 9 November 1961. (NASA)
The X-15 rolled over when the left landing skid collapsed because of the high-speed, overweight emergency landing at Mud Lake, Nevada. Jack McKay was trapped in the cockpit and suffered serious spinal injuries. (NASA)
The X-15 rolled over when the left landing skid collapsed because of the high-speed, overweight emergency landing at Mud Lake, Nevada. Jack McKay was trapped in the cockpit and suffered serious spinal injuries. (NASA)
The Number Two X-15, 56-6671, lies upside down and severely damaged at Mud Lake, Nevada, 9 November 1962. (NASA)
The Number Two X-15, 56-6671, lies upside down and severely damaged at Mud Lake, Nevada, 9 November 1962. (NASA)

McKay was seriously injured. He was trapped in the upside down X-15 and was in danger from the vapors of the ammonia propellants and liquid oxygen. An H-21 rescue helicopter hovered overhead to blow the vapor away.

Prior to the flight, an Air Force C-130 had brought a fire engine and crew to standby at Mud Lake, returned to Edwards and picked up a second fire engine and its crew, then remained airborne should an emergency landing be made at another intermediate dry lake.

These propositioned emergency assets were able to rescue McKay and to transport him to the hospital back at Edwards.

McKay eventually recovered sufficiently to return to flight status, but ultimately his injuries forced him to retire.

The Number Two X-15 was severely damaged. It was taken back to North American and was rebuilt into the X-15A-2, intended to reach speeds up to Mach 8. It would be more than a year and a half before it flew again.

North American Aviation X-15A-2 56-6671, after a 19-month repair, redesign and modification program. The fuselage was lengthened, additional propellant and reaction control tanks installed internally, the nose wheel and rear landing skid struts lengthened, and external tanks installed. (NASA)
North American Aviation X-15A-2 56-6671, after a 19-month repair, redesign and modification program. The fuselage was lengthened, additional propellant and reaction control tanks installed internally, the nose wheel and rear landing skid struts lengthened, and external tanks installed. (NASA)

© 2016, Bryan R. Swopes

9 November 1961

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Major Robert M. White was the first pilot to exceed Mach 4, Mach 5, and on 9 November 1961, he flew to Mach 6.04. (NASA)
Major Robert M. White was the first pilot to exceed Mach 4, Mach 5, and on 9 November 1961, he flew to Mach 6.04. (U.S. Air Force)

9 November 1961: Major Robert M. White, U.S. Air Force, became the first pilot to fly faster than Mach 6 when he flew the number two North American Aviation X-15 hypersonic research rocketplane, 56-6671, to Mach 6.04.

This was the 45th flight of the X-15 program, and Bob White’s 11th flight. The purpose of this test flight was to accelerate 56-6671 to its maximum velocity, to gather data about aerodynamic heating at hypersonic speeds, and to evaluate the rocketplane’s stability and handling.

Boeing NB-52A Stratofortress 52-003 carries a North American Aviation X-15 piloted by Major Bob White. (NASA)
Boeing NB-52A Stratofortress 52-003 carries a North American Aviation X-15 piloted by Major Bob White. (NASA)

The X-15 was carried to approximately 45,000 feet (13,716 meters) while mounted to a pylon under the right wing of the “mothership,” a Boeing NB-52B Stratofortress, 52-008, nicknamed Balls 8. White was dropped over Mud Lake, Nevada, approximately 200 miles (322 kilometers) north of Edwards Air Force Base. Once clear of the B-52, he ignited the Reaction Motors XLR99-RM-1 rocket engine, and with it producing 57,000 pounds of thrust (253.549 kilonewtons) at full throttle, the X-15 accelerated for 86.9 seconds. The rocketplane reached a peak altitude of 101,600 feet (30,968 meters). Its speed was Mach 6.04 (4,094 miles per hour/6,589 kilometers per hour).

White stated in his post-flight report, “When I leveled off at about 101,000 feet, I made a little downward pressure [on the control stick], because I didn’t want to be climbing. I remember . . . going along watching that [Mach] meter reading roughly 6,000 feet per second, [and] saying to myself, ‘Go, go, go, go!’ We did just crack it, because we knew that bringing all the proper things together, we could or should get just about Mach 6.”

In order to achieve the goal, the flight plan called for pushing the LR-99 to the point of exhaustion instead of manually shutting down the engine at an arbitrary point. White said, “The shutdown seemed to be a little bit different this time, compared with a shutdown by closing the throttle. It seemed to occur over a longer time interval.” 

— The X-15 Rocket Plane: Flying the First Wings into Space, by Michelle Evans, University of Nebraska Press, Lincoln and London, 2013, Chapter 3 at Page 87.

The number two North American Aviation X-15, 56-6671, is dropped from the Boeing NB-52A Stratofortress, 52-003. The XLR99 rocket engine is just igniting. Frost from the cryogenic fuels coats the fuselage. (NASA)
The number two North American Aviation X-15, 56-6671, is dropped from the Boeing NB-52A Stratofortress, 52-003. The XLR99 rocket engine is just igniting. Frost from the cryogenic fuels coats the fuselage. (NASA)

“The airplane really did get hot on those flights. Temperatures in excess of 1,300 °F. were recorded. Parts of the airplane glowed cherry red and softened up a bit during those flights. The airplane got so damned hot that it popped and banged like an old iron stove. It spewed smoke out of its bowels and it twitched like frog legs in a skillet. But it survived.”

— At the Edge of Space: The X-15 Flight Program, by Milton O. Thompson, Smithsonian Institution Press, Washington, 1992, at Page 98.

North American Aviation X-15 56-6671 accelerates after the XLR99 engine is ignited. (NASA)
North American Aviation X-15 56-6671 accelerates after the XLR99 engine is ignited. (NASA)

As the X-15 decelerated through Mach 2.4, the right side windshield shattered, leaving it completely opaque. On Bob White’s previous flight, the left windshield had also broken. Fortunately, in both cases, only the outer layer of the dual pane glass broke. The reduced visibility made the approach difficult to judge, but White made a successful landing, touching down on Rogers Dry Lake after a flight of 9 minutes, 31.2 seconds duration.

The number three North American Aviation X-15 rocketplane, 56-6672, just before touchdown on Rogers Dry Lake. A Lockheed F-104 Starfighter chase plane escorts it. The green smoke helps the pilots judge wind direction and speed. Frost on the X-15's belly shows residual propellants in the tanks. (NASA)
The number three North American Aviation X-15 rocketplane, 56-6672, just before touchdown on Rogers Dry Lake. A Lockheed F-104 Starfighter chase plane escorts it. The green smoke helps the pilots judge wind direction and speed. Frost on the X-15’s belly shows residual propellants in the tanks. (NASA)
NASA ET62-0270
The shattered windshield of X-15 56-6671, 9 November 1961. (NASA)

A P-51 Mustang fighter pilot in World War II, Robert M. White was shot down on his 52nd combat mission in February 1945 and captured. He was held as a prisoner of war until the war in Europe came to an end in April 1945. White was recalled to active duty during the Korean War. He was a graduate of the Air Force Experimental Test Pilot School and flew tests of many aircraft at Edwards before entering the X-15 program.

Major White had been the first pilot to fly faster than Mach 4, Mach 5 and Mach 6. He was the first to fly over 200,000 feet, then over 300,000 feet. He made at total of sixteen X-15 flights.

Major Robert M. White, U.S. Air Force, with one of the three North American Aviation X-15s on Rogers Dry Lake, 1961. (NASA)
Major Robert M. White, U.S. Air Force, with one of the three North American Aviation X-15s on Rogers Dry Lake, 1961. (NASA)

After leaving the X-15 program, Bob White returned to operational duties. Later, he flew 70 combat missions over North Vietnam in the Republic F-105 Thunderchief supersonic fighter bomber, including leading the attack against the Paul Doumer Bridge at Hanoi, 11 August 1967, for which he was awarded the Air Force Cross. He next went to Wright-Patterson AFB where he was director of the F-15 Eagle systems program. He returned to Edwards AFB as commander of the Air Force Flight Test Center. White was promoted to Major General in 1975.

General White retired from the U.S. Air Force in 1981. He died 10 March 2010.

A North American Aviation support crew deactivates X-15 56-6671 on Rogers Dry Lake after a flight, while the mothership, NB-52A Stratofortress 52-003 flies overhead. (NASA)
A North American Aviation support crew deactivates X-15 56-6671 on Rogers Dry Lake after a flight, while the mothership, NB-52A Stratofortress 52-003 flies overhead. (NASA)

© 2016, Bryan R. Swopes

9–11 November 1956

Aviation, , , , , , , ,
Major Roy Lee Anderson, USMC (left), and Sikorsky test pilot Robert Stewart Decker. (FAI)

9–11 November 1956: Over a three-day period at Windsor Locks, Connecticut, a Sikorsky HR2S-1 heavy-lift helicopter, flown by Major Roy Lee Anderson, United States Marine Corps, and Sikorsky test pilot Robert Stewart Decker, set three Fédération Aéronautique Internationale (FAI) world records for payload and speed.

On 9 November 1956, the HR2S-1 carried a payload of  5,000 kilograms (11,023 pounds) payload to an altitude of 3,722 meters (12,211 feet). ¹

The following day, 10 November, it set a record for the Greatest Mass Carried to a Height of 2,000 Meters (6562 feet), with a payload of 6,010 kilograms (13,250 pounds). ²

On 11 November, the third day, Anderson and Decker flew the helicopter to a speed of 261,91 kilometers per hour (162.74 miles per hour) over a  3-kilometer (1.86 statute miles) course .³

For these flights, Major Anderson was awarded a third gold star in lieu of a fourth award of the Distinguished Flying Cross.

The world-record-setting Sikorsky HR2S-1. (Fédération Aéronautique Internationale)

United Press reported:

US Helicopter Sets Altitude, Speed Records

     STRATFORD, Conn.—UP—A twin-engine Marine helicopter has established two international records for speed and altitude.

     The Sikorsky division of United Aircraft Corporation said one of its S56 helicopters reached 162.7 miles per hour during a recent trial. The old record, set two years ago by another Sikorsky model, was 156 miles per hour.

Tops Russian Craft

     The S56 flew more than 12,000 feet high while carrying 11,050 pounds. With the payload increased to 13,250 pounds it reached 7,000 feet, far outstripping the previous mark set by a Russian craft of 8,820 pounds to 6,560 feet.

     The altitude trials were conducted from Sikorsky’s field in Stratford. Major Roy L. Anderson was pilot and Robert S. Decker copilot.

     The records are subject to confirmation by the Federation Aeronautique Internationale. The trials were conducted under the auspices of the National Aeronautics [sic] Association.

—The Modesto Bee, Vol 79, No. 272, Tuesday, 13 November 1956, Page 12, Column 2

The Sikorsky HR2S-1 was an assault and heavy-lift helicopter produced for the United States Navy and Marine Corps. It was later adopted by the U.S. Army as the H-37 Mohave.

The S-56 was a large twin-engine helicopter, following the single main rotor/tail (anti-torque) rotor configuration pioneered by Sikorsky with the Vought-Sikorsky VS-300 in 1939. The helicopter was designed to be flown by two pilots in a cockpit located above the main cabin. The two engines were placed in nacelles outboard of the stub wings which also housed the helicopter’s retractable main landing gear. Two large clam shell cargo doors and loading ramp were placed in the nose. The HR2S-1 incorporated a stability system and an automatic torque compensating tail rotor.

The S-56 series was the largest and fastest helicopter built up to that time, and remains the largest reciprocating engine helicopter ever built.

The S-56 was equipped with a five blade articulated main rotor. This allowed increased lift and higher forward air speed before encountering retreating blade stall than earlier three and four blade systems. A six blade rotor system was tested, which showed further improvements, but was not adopted. The main rotor diameter was initially 68 feet (20.726 meters), but later increased to 72 feet (21.946 meters). The main rotor blades had a chord of 1 foot, 9.5 inches (0.546 meters) and used the symmetrical NACA 0012 airfoil, which was standard with American helicopters up to that time. Later in the program, the blades were lengthened and the chord increased to 1 foot, 11.65 inches (0.601 meters). The airfoil was changed to the NACA 0010.9 airfoil. These changes resulted in increased lift and higher speed. The four blade tail rotor had a diameter of 15 feet (4.572 meters). The individual blades had a chord of 1 foot, 1.5 inches (0.343 meters). As is common with American helicopters, the main rotor system turned counter-clockwise as seen from above. (The advancing blade is on the right.) The tail rotor turned counter-clockwise when viewed from the helicopter’s left side. (The advancing blade is above the axis of rotation.)

Sikorsky S-56 three-view illustration with dimensions. (Sikorsky Historical Archives)

With the longer blades installed, the helicopter’s length with rotors turning was 88 feet (26.822 meters). The fuselage had a length of 64 feet, 10.69 inches (19.779 meters), and the height was 17 feet, 2 inches (5.232 meters). The HR2S-1 had an empty weight of 21,502 pounds (9,753 kilograms), and maximum weight (overload) of 31,000 pounds (14,061 kilograms). Its fuel capacity was 1,000 U.S. gallons (3,785 liters) carried in 6 tanks located in the nacelles, wings and fuselage. It could carry 20 fully-equipped troops, or 16 litters. Its maximum cargo capacity was 10,000 pounds (4,536 kilograms).

The HR2S-1 had an automatic main rotor blade folding system, and its tail rotor pylon could be folded alongside the fuselage, reducing the length to 55 feet, 8 inches (16.967 meters) and width to 27 feet, 4 inches (8.331 meters). This allowed the helicopter to use aircraft carrier elevators and reduced storage space on the hangar deck.

Early S-56 models were powered by two air-cooled, supercharged 2,804.461 cubic inch displacement (45.957 liters) Pratt & Whitney Double Wasp R-2800-50 two-row, 18-cylinder radial engines rated at 1,900 horsepower at 2,500 r.p.m. These were upgraded in later models to R-2800-54s. These were direct drive engines with a compression ratio of 6.75:1. The R-2800-54 was rated at 2,100 horsepower at 2,700 r.p.m. to 5,000 feet (1,524 meters) for takeoff; with a normal power rating of 1,900 horsepower at 2,600 r.p.m. to 7,000 feet (2,134 meters). It required 115/145 octane aviation gasoline. Each engine was supplied with 13.3 gallons (50.35 liters) of lubricating oil. The R-2800-54 was 6 feet, 9.00 inches long (2.057 meters), 4 feet, 5.00 inches (1.346 meters) in diameter, and weighed 2,300 pounds (1,043 kilograms).

The helicopter’s engines were installed at an 80° angle to the aircraft center line, with a 12.5° upward angle to align with the main transmission input. The front of the engines faced inboard. According to Sikorsky, this unusual installation resulted in high oil consumption, and because the engines were operated at continuous high r.p.m., the time interval between engine overhauls was reduced from the normal 2,000 hours to just 350 hours.

Two U.S. Marine Corps HR2S-1 Mohave assault helicopters of Marine Helicopter Transport Squadron (HMR) 462 at Camp Pendelton, California, late 1950s. (Naval History and Heritage Command)

The production HR2S-1 had a cruise speed of 100 knots (115 miles per hour/185 kilometers per hour), and a maximum speed of 121 knots (139 miles per hour/224 kilometers per hour) at Sea Level. The helicopter’s service ceiling was 13,800 feet (4,206 meters), and its absolute hover ceiling was 5,400 feet (1,646 meters). It had a maximum rate of climb of 1,580 feet per minute (8.03 meters per second) at Sea Level, and a vertical rate of climb 950 feet per minute (4.83 meters per second), also at Sea Level. The combat radius of the HR2S-1 was 100 nautical miles (115 statute miles/185 kilometers) at 100 knots (115 miles per hour/185 kilometers per hour.)

55 HR2S-1s were delivered to the U.S. Marine Corps. The U.S. Army purchased 94 S-56s in the H-37A Mohave configuration. 90 of these were later returned to Sikorsky to be upgraded to H-37Bs. This added the automatic stabilization system of the HR2S-1, changed the variable incidence horizontal stabilizers on both side of the fuselage to a single stabilizer on top of the tail rotor pylon. Engine oil capacity was increased to 30 gallons (113.6 liters) per engine.

A total of 154 S-56s were built between 1953 and 1960.

U.S. Marines exit the front cargo doors of a Sikorsky XHR2S-1 helicopter during a training exercise. (NAID 74241875

¹ FAI Record File Number 13129

² FAI Record File Number 13124

³ FAI Record File Number 13098

© 2023, Bryan R. Swopes