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Draft:Jack Louis Zimmerman

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Jack Louis Zimmerman
Jack L. Zimmerman, Hughes Aircraft Division test pilot, 1966
Born(1921-09-01)September 1, 1921
Chicago, Illinois, U.S.
DiedSeptember 1, 2002(2002-09-01) (aged 81)
San Diego, California, U.S.
OccupationsMilitary pilot, experimental test pilot
Known forSeven FAI world records (1966)
First helicopter landing on Pikes Peak (1955)
Pioneer U.S. Army helicopter pilot
SpouseDorothy Zimmerman
ChildrenLarry Zimmerman
Hal Zimmerman
AwardsSoldier's Medal
Military career
Allegiance United States
Branch
United States Army Air Forces
Rank
Second Lieutenant
UnitAircraft Repair Unit Floating (ARU-F)
Conflicts
World War II (Pacific Theater)
AwardsSoldier's Medal

Jack Louis Zimmerman (September 1, 1921 – September 1, 2002) was an American military veteran, experimental test pilot, and helicopter pioneer whose career spanned nearly four decades.[1] One of the U.S. Army's first trained helicopter pilots, Zimmerman flew in the Pacific Theater during World War II as part of Operation Ivory Soap, served as a bush pilot in Alaska, and went on to become chief test pilot for Cessna Aircraft's helicopter division and later an experimental test pilot for Hughes Tool Company's Aircraft Division.[2] In March 1966, flying the Hughes YOH-6A Light Observation Helicopter at Edwards Air Force Base, he set seven Fédération Aéronautique Internationale (FAI) world records — at least one of which still stands today.[3]

Early life

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Jack Louis Zimmerman was born on September 1, 1921, in Chicago, Illinois, the second of three children of Bernard Zimmerman, an electrician, and Esther Rujawski Zimmerman.[1] He graduated from Hirsch High School in Chicago in 1940, then studied engineering at the University of Chicago, but left to enlist in the United States Army Air Corps.[1]

Military service

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World War II (1943–1945)

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Second Lieutenant Jack L. Zimmerman upon graduating from flight school, 1943.

Zimmerman graduated from flight school in 1943 and was commissioned as a Second Lieutenant in the U.S. Army Air Corps.[1] He was sent to Freeman Field, Indiana, as part of the U.S. Army's first class of student helicopter pilots, training on the Sikorsky R-4.[1]

Aircraft Repair Unit Floating (ARU-F) and Operation Ivory Soap

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On completion of training, Zimmerman was assigned to the Aircraft Repair Unit Floating (ARU-F) as part of the classified Operation Ivory Soap.[1][4] This top-secret program, authorized by General Henry "Hap" Arnold, converted six Liberty ships into floating aircraft repair facilities to support forward operations across the Pacific theater.[4] The ARU-F concept used helicopters as a logistical arm to fly parts and instruments from ship to shore — making the U.S. Army, not the Navy, the pioneer of helicopter operations at sea.[5] The ships were manned by Merchant Marine sailors, commanded by an Army Colonel, and equipped with full machine shops capable of manufacturing aircraft parts at sea or in port.[4] Operation Ivory Soap remained classified until 1953.[4]

Zimmerman was assigned to the 1st ARU(F), the Liberty ship USAT Maj. Gen. Robert Olds (formerly the SS Daniel E. Garrett).[1] The small landing platforms near the bows of these ships were classified during the war; military censors deleted all references to them, fearing that kamikaze pilots might specifically target the vessels.[5]

WestPac deployment

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Zimmerman's Sikorsky R-4 hovering over a B-29 bomber at Tinian, 1945. This photograph was later exhibited at the Smithsonian National Air and Space Museum.

The ARU-F ships supported U.S. military operations across the Western Pacific, including the Philippines, Iwo Jima, Okinawa, Saipan, Tinian, and Guam.[5] During operations at Tinian in 1945, Zimmerman flew a photographic mission at low altitude over a restricted section of North Field airfield — not knowing that the area housed the Enola Gay, the B-29 Superfortress that would later drop the first atomic bomb on Hiroshima.[1] The resulting photograph of Zimmerman's Sikorsky R-4 hovering above the bomber was later displayed at the Smithsonian National Air and Space Museum in Washington, D.C., as part of a special exhibit on the Enola Gay.[1]

Soldier's Medal

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The Soldier's Medal awarded to Jack L. Zimmerman for his rescue of Pvt. William K. Troche on November 1, 1944.

On November 1, 1944, Zimmerman's Sikorsky R-4 was caught in a downdraft and lost power as it approached the narrow landing platform of a Liberty ship, crashing into the sea — believed to be the first instance of a helicopter ditching at sea.[1] After extricating himself from the cockpit, Zimmerman discovered his passenger, Army Air Forces Pvt. William K. Troche, could not surface due to a failed life preserver. Zimmerman dove back and rescued Troche, supporting him in open water for approximately 30 minutes until both men were pulled aboard the ship.[1] The official Soldier's Medal citation reads:

For heroism displayed in rescuing an enlisted man from drowning on 1 November 1944. While taking off from the flight deck of the SS Daniel E. Garrett, Lieutenant Zimmerman with Private William K. Troche as passenger was forced to land at sea. Lieutenant Zimmerman at the risk of his life made several dives into the plane when his passenger had difficulty in extricating himself from the craft. When Private Troche's life preserver failed to operate properly, Lieutenant Zimmerman supported him in the water for approximately 30 minutes and afterwards pulled him to a life preserver, which had been thrown from the ship. The heroism displayed by Lieutenant Zimmerman on this occasion reflects great credit upon himself and the military service.[6]

Post-war career

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Commercial pilot and bush pilot, Alaska (1946–c. 1951)

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Following World War II, Zimmerman worked as a commercial helicopter pilot in various locations, including time as a bush pilot in Alaska.[1]

Chief test pilot, Seibel Helicopter / Cessna Aircraft (1951–1963)

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Zimmerman test flying the Seibel S-4B, c. 1951.

Zimmerman became chief test pilot for Seibel Helicopter Company in Wichita, Kansas, testing the Seibel S-4B light helicopter.[2][6] The Seibel company had been founded by Charles M. Seibel, a former Bell Helicopter engineer.[2] On January 14, 1952, Cessna Aircraft acquired Seibel Helicopter in a stock swap, and Zimmerman continued as chief test pilot for the Cessna helicopter division from 1952 to 1963,[2] testing the Cessna CH-1 Skyhook and YH-41 Seneca.[1][7]

Pikes Peak first landing (1955)

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On September 13, 1955, Zimmerman piloted a Cessna CH-1A to make the first successful helicopter landing on the summit of Pikes Peak, Colorado, at an elevation of 14,110 feet.[2][8] This achievement is independently confirmed by multiple published aviation sources.[9][7]

Hughes Tool Company Aircraft Division (1963–1982)

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In 1963, Zimmerman joined the Hughes Tool Company Aircraft Division (later Hughes Helicopters) as an experimental test pilot.[1] Zimmerman played a central role in the development and testing of the Hughes Model 369, designated the OH-6A Cayuse by the U.S. Army and nicknamed the "Loach." The OH-6A entered active U.S. Army service in 1966 and saw combat in Vietnam.[3] He also flew and tested the piston-engine Hughes Model 269, a light training helicopter that remains in production today as the Schweizer S300.[1]

Zimmerman became the most experienced OH-6A pilot in the world and the first aviator to log 1,000 hours in the type.[1]

His final flight as a test pilot in 1982 was in the AH-64 Apache attack helicopter, which he had first flown as a prototype in 1975.[1] He retired from Hughes in 1982 after 39 years of continuous test flying, from 1943 to 1982.[1]

FAI world records (1966)

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Zimmerman at Edwards Air Force Base following his FAI world record distance flight on 20 March 1966.

In a ten-day period in March 1966, Zimmerman set seven FAI world records flying the third prototype Hughes YOH-6A Light Observation Helicopter, serial number 62-4213, at Edwards Air Force Base, California.[1][3] The record-setting YOH-6A (serial 62-4213) is preserved in the collection of the United States Army Aviation Museum at Fort Rucker, Alabama.[3]

20 March 1966

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RecordPerformanceFAI File No.Status
Distance Over a Closed Circuit Without Landing (Class E-1b)1,700.124 km (917.395 nm; 1,056.406 mi)762Still standing (2024)[1]

27 March 1966

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RecordPerformanceFAI File No.Status
Altitude in Horizontal Flight (Class E-1b)8,061.3 m (26,447.8 ft)9920 / 9921Still standing (2024)[3]
Altitude Without Payload (Class E-1c)5,503 m (18,054 ft)772Recorded[3]
Time to Climb to 3,000 m (Class E-1b)4 min 1.5 sec9922Recorded[3]
Time to Climb to 3,000 m (Class E-1c)5 min 36.2 sec771Recorded[3]
Time to Climb to 6,000 m (Class E-1b)7 min 12 sec9923Recorded[3]

Personal life

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Jack Zimmerman was married to Dorothy Zimmerman. Together they had two sons, Larry and Hal.

Death and legacy

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Jack Louis Zimmerman died on September 1, 2002 — his 81st birthday — in San Diego, California.[1]

His legacy is recognized at the American Helicopter Museum and Education Center in West Chester, Pennsylvania. His 1966 FAI world record for distance over a closed circuit without landing has remained unbroken for over six decades.[1]

Awards and honors

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  • Soldier's Medal — for heroism in rescuing Pvt. William K. Troche after a helicopter crash at sea, November 1, 1944; believed to be the first helicopter ditching at sea[1]
  • Seven FAI World Records (March 1966), including records in altitude, time-to-climb, and distance[1][3]
  • First Aviator to Log 1,000 Hours in the Hughes OH-6A Light Observation Helicopter[1]
  • First successful helicopter landing on Pikes Peak, September 13, 1955[2][8]

Aircraft flown

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AircraftPeriodRoleSource
Sikorsky R-41944–1945Military helicopter pilot, ARU-F, Pacific Theater[1]
Seibel S-4B1951–1952Chief test pilot, Seibel Helicopter[2]
Cessna CH-1 Skyhook / CH-1A1952–1963Chief test pilot, Cessna Aircraft helicopter division[2]
Cessna YH-41 Seneca1952–1963Chief test pilot, Cessna Aircraft helicopter division[1]
Hughes Model 2691963–1982Test pilot, Hughes Tool Co. Aircraft Division[1]
Hughes YOH-6A / OH-6A Cayuse1963–1982Test pilot, Hughes Tool Co. Aircraft Division[3]
Boeing AH-64 Apache (prototype)1975–1982Test pilot, Hughes Tool Co. Aircraft Division[1]

References

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  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Swopes, Bryan R. "20 March 1966." This Day in Aviation, 20 March 2022.
  2. 1 2 3 4 5 6 7 8 Claflin, Ed. "Cessna in the Helicopter Age." Vertical Magazine, 30 June 2016.
  3. 1 2 3 4 5 6 7 8 9 10 11 Swopes, Bryan R. "27 March 1966." This Day in Aviation, 27 March 2022.
  4. 1 2 3 4 Haskew, Michael E. "Operation Ivory Soap: The WWII Experiment That Created Modern Helicopter Combat Missions." Military.com, 21 October 2025.
  5. 1 2 3 Carter, Mitchell P. "Operation Ivory Soap and the Largest Helicopter Rescue of WWII." Sikorsky Archives News, Forum 79. Igor I. Sikorsky Historical Archives.
  6. 1 2 Ledwin, Richard. "The CESSNA CH-1 Helicopter – A Record Setter – 60 Years Later." CollectAir.org, 2021. Also see: collectair.org/zimmerman.html (via Web Archive).
  7. 1 2 McDowell, Jason. "That Time Cessna Made a Helicopter." Flying Magazine, 22 August 2023.
  8. 1 2 Albertson, Mark. "1955: Landing Atop Pikes Peak." Army Aviation Magazine. Citing: "Lands Atop Pikes Peak," Army Aviation, Vol. 3, No. 10, October 1955.
  9. ↑ Barnacal, Daniel. "Cessna CH-1 Skyhook: The Forgotten Story of Cessna's First and Only Helicopter." AutoEvolution, 5 August 2023.
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Category:1921 births Category:2002 deaths Category:American test pilots Category:Helicopter pilots Category:United States Army Air Forces personnel of World War II Category:Recipients of the Soldier's Medal Category:Aviation record holders Category:People from Chicago, Illinois Category:People from San Diego, California Category:Hughes Helicopters Category:Cessna

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