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Boeing KC-97 Stratofreighter

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(Redirected from KC-97L Stratotanker) 1951–1978 American strategic tanker aircraft
KC-97 Stratofreighter
KC-97L in Ohio Air National Guard markings
General information
TypeStrategic tanker
ManufacturerBoeing
Primary usersUnited States Air Force Spanish Air Force
Number built811
History
Manufactured1951–1956
Introduction dateJuly 14, 1951
RetiredJune 1978
Developed fromBoeing C-97 Stratofreighter

The Boeing KC-97 Stratofreighter is a four-engined, piston-powered United States strategic tanker aircraft based on the Boeing C-97 Stratofreighter. It replaced the KB-29 and was succeeded by the Boeing KC-135 Stratotanker.

Design and development

The KC-97 Stratofreighter was an aerial refueling tanker variant of the C-97 Stratofreighter (which was itself based on the Boeing B-29 Superfortress), greatly modified with all the necessary tanks, plumbing, and a flying boom first developed for the KB-29 bomber. The cavernous upper deck was capable of accommodating oversize cargo accessed through a very large right-side door. In addition, transferable jet fuel was contained in tanks on the lower deck (G-L models). Both decks were heated and pressurized for high altitude operations. The boom operator lay prone, viewing operations through a window at the bottom of the tail, a configuration later used on the KC-135.

A Boeing KC-97 Stratofreighter's refueling boom operator's station from the National Museum of the US Air Force

Note: Occasionally the KC-97 has been referred to as "Stratotanker". However, all reputable sources refer to the KC-97 as Stratofreighter, not -tanker. This includes both Boeing and the USAF themselves.

Operational history

Two USAF A-7 Corsair IIs refueling from a KC-97.

The USAF began operating the KC-97 in 1950. It received a total of 811 KC-97s from Boeing, as opposed to only 74 of the C-97 cargo version, while ordering 819 KC-97s and 74 C-97s. The KC-97 carried aviation gasoline for its own piston engines but it carried jet fuel for its refueling mission, this required an independent system for each type of fuel. However in an emergency, it was able to also offload its aviation gas to a receiver in a procedure universally known as a "save".

These tankers were vitally important to the world-wide Boeing B-47 Stratojet strategic operations. An example was the support of Arctic reconnaissance flights from Thule Air Base.

During Operation Creek Party, which started in 1967 and lasted for 10 years, Air National Guard and Air Force Reserve tankers supported active duty USAF and NATO units in Europe, including an 160th Air Refueling Group Ohio Air National Guard KC-97L.

While it was an effective tanker, the KC-97's slow speed and low operational altitude complicated refueling operations with jet aircraft. B-52s typically lowered their flaps and rear landing gear to slow the aircraft enough to refuel from the KC-97. In addition, a typical B-52 refueling engagement profile would involve a descent that allowed the aircraft pair to maintain a higher airspeed (220–240 knots). In the early 1960s, the Tactical Air Command added General Electric J47 two twin- jet pods from retired KB-50 aerial tankers to produce the KC-97L. These jet pods increased the speed of the KC-97 (for short periods of time) and made it more compatible with jet fighter planes like the F-84, F-100, and F-101.

In 1956, the Strategic Air Command began phasing out its KC-97s in favor of the KC-135 Stratotanker. KC-97s continued flying with Tactical Air Command, the Air Force Reserve, and the Air National Guard. The rest of the KC-97s were retired completely in 1978, when the Texas Air National Guard and the Utah Air National Guard exchanged their KC-97Ls for the C-130 Hercules and the KC-135 Stratotanker, respectively.

One KC-97 airframe (AF Ser. No. 52-0828) was adapted into the Aero Spacelines Super Guppy, a transport plane designed to carry Apollo Program rocket stages from California to Florida. The aircraft carried the Saturn S-IVB stage, which served as the second stage of the Saturn IB, the third stage of the Saturn V, and the fourth stage for the never-built Nova rocket.

This modified KC-97, constructed in 1953, was eventually purchased by NASA in 1997. It is still in service supporting NASA, other Federal agencies, and Federal contractors. It is one of two KC-97s left still in flyable condition, the other being former KC-97G 52-2718, "Angel of Deliverance", currently flown by Berlin Airlift Historical Foundation as YC-97A 45-59595.

Variants

The KC-97's refueling boom
Source: AIRTime
KC-97A
Three C-97As were converted into aerial refueling tankers with rear loading door removed and a flight refueling boom added. After the design was proven, they were converted back into the standard C-97A.
KC-97E
aerial refueling tankers with rear loading doors permanently closed, 60 built. Some were later converted into transports as the C-97E.
KC-97F
3800 hp R-4360-59B engines and minor changes, 159 built. Some were later converted into transport as the C-97F.
KC-97G
Dual-role aerial refueling tankers/cargo transportation aircraft. KC-97G models carried underwing fuel tanks. 592 built.
EC-97G
ELINT conversion of three KC-97Gs. 53-106 was operated by the Central Intelligence Agency for covert ELINT operations in the West Berlin Air Corridor.
C-97G
135 KC-97Gs converted to transports.
GKC-97G
Five KC-97Gs were used as ground instruction airframes.
JKC-97G
One aircraft was modified to test the underwing General Electric J47-GE-23 jet engines, and was later designated KC-97L.
HC-97G
KC-97Gs converted for search and rescue operations, 22 converted.
KC-97H
One KC-97F was experimentally converted into a hose-and-drogue refueling aircraft.
YC-97J
two KC-97G conversion with four 4250 kW Pratt & Whitney YT34-P-5 turboprops, dropped in favour of the Boeing KC-135 Stratotanker.
C-97K
27 KC-97Gs converted to troop transports.
KC-97L
81 KC-97Gs modified with two J47 turbojet engines on underwing pylons.

Operators

Spanish Boeing KC-97L Stratofreighter at Albacete (1985)A KC-97L Stratofreighter (s/n 52-2630 Zeppelinheim) at the National Museum of the United States Air Force
A Boeing KC-97 Stratofreighter's cockpit
A Boeing KC-97 Stratofreighter's Flight Engineer's panel
 Israel
 Spain
 United States

The following USAF wing organizations flew the various KC-97 models at some time during their existence:

Active duty

Air National Guard

Accidents and incidents

27 June 1954
KC-97G AF Ser. No. 52-2654 which departed from Altus Air Force Base, Oklahoma, encountered poor weather at its destination, March Air Force Base in California, and attempted to divert to Norton Air Force Base, but crashed into Box Springs Mountain north of Riverside, California, killing all 14 people on board.
4 May 1955
USAF KC-97G 53-0110 was flying in formation when it crashed into the Atlantic 90 mi off Iceland due to loss of control caused by an engine fire, killing all nine on board.
6 July 1956
USAF KC-97E 51-0220 crashed in a wooded area 45 mile northeast of Goose Bay, Canada after reporting an engine fire, killing all six on board.
22 January 1957
a KC-97G AF Ser. No. 53-0222 from Griffiss Air Force Base, New York, crashed in the foothills of the Adirondack Mountains, killing its crew of seven.
9 May 1957
KC-97F AF Ser. No. 51-0258 en route from Sidi Slimane Air Base, Morocco, to Lajes AB, Azores, ditched in the Atlantic 550 km (343.8 mls) SE of the Azores Islands following a double engine failure. All seven crew survived. The airplane floated for ten days before being sunk by the battleship USS Wisconsin.
18 July 1957
KC-97G AF Ser. No. 52-2737 from the 380th Air Refueling Squadron with a crew of eight, exploded and crashed into Lake Champlain at 2128 hrs., when two of the four engines failed three minutes after take-off from Plattsburgh AFB, New York. There were three survivors.
29 October 1957
KC-97G AF Ser. No. 52-2711 of the 509th Bomb Wing, out of Walker AFB, New Mexico, crashed 35 miles north of Flagstaff, Arizona, while on a nine-hour low-level survey flight to determine minimum altitude restrictions for B-47 training routes. The aircraft was seen over Gray Mountain, Arizona, at altitude of 60 feet shortly after 0830 hrs., and then heard striking a cloud-shrouded cliff face, killing 16 crew and strewing wreckage for 200 yards along mountainside.
22 July 1959
KC-97 AF Ser. No. 52-2703 of Pease Air Force Base crashed near Andover, New Hampshire, while on a nighttime training mission; all seven crewmen were killed.
14 December 1959
KC-97G AF Ser. No. 53-0231 of the 384th Air Refueling Squadron, out of Westover AFB, Massachusetts, collided with a B-52 during a refueling mission at an altitude of ~15,000 feet. The aircraft lost the whole left horizontal stabilizer and elevator, the rudder, and the upper quarter of the vertical stabilizer. The crew made a no-flap, electrical power off landing at night at Dow AFB, Maine; seven crew okay. "Spokesmen at Dow Air Force, Bangor, said the B52 apparently 'crowded too close' and rammed a fuel boom into the tail of a four-engined KC95 tanker plane." Aircraft stricken as beyond economical repair. Two crew on the B-52 ejected, parachuted safely, and were recovered by helicopters in a snow-covered wilderness area. The bomber and remaining eight crew safely landed at Westover AFB.
30 March 1960
KC-97 AF Ser. No. 51-0363 (Manufacturer's Serial Number 16430) ditched and sank off Cape Canaveral. This particular aircraft was lost due to engine damage caused by hail. The crash resulted in 3 fatalities of the 14 crew. The wreck of the aircraft was discovered June 6, 2015, in 365 feet of water by divers.
15 April 1960
KC-97G AF Ser. No. 52-0919 of the 307th Air Refueling Squadron, 307th Bomb Wing, crashed on take-off from Lincoln AFB, Nebraska, after the undercarriage collapsed. All 24 on board survived, with two airmen suffering leg fractures and five others with minor cuts and burns.
27 June 1960
KC-97G AF Ser. No. 52-2728 of the 380th Air Refueling Squadron, Plattsburgh AFB, New York, suffered failure of lubrication on an engine impeller shaft during an evening four-hour training mission to refuel a Boeing B-47 Stratojet. During rendezvous at 15,500 feet, the tanker's number one (port outer) powerplant caught fire. As the bomber moved away from the burning tanker, the crew tried unsuccessfully to put out the blaze. The plane went into a spin as the wing failed outboard of the engine; the aircraft crashed on Jonathan Smith Mountain, a hill east of Puzzle Mountain in Newry, Maine. The flash of the fire was seen from as far away as Lewiston and Bridgton. All five crew were killed. Wreckage covering five acres was still there as of 2010.
28 February 1961
KC-97 AF Ser. No. UNKNOWN of Selfridge Air Force Base, MI. Aircraft crashed shortly after take-off due to engine failure. All five crew members were killed. The aircraft struck houses and an ornamental windmill that was a landmark along Gratiot Rd. (M-25), just north of the base. The attached article incorrectly identifies Selfridge AFB as Selfridge ANGB. Selfridge was not transferred to the Air National Guard until 1 July, 1971. https://www.baaa-acro.com/crash/crash-boeing-kc-97-stratotanker-selfridge-afb-5-killed
5 November 1964
KC-97 AF Ser. No. unknown of Pease Air Force Base crashed on takeoff; all five crewmen were killed.
19 December 1964
USAF KC-97G 52-907 ran off the runway at Ernest Harmon AFB after the pilot landed too far down the runway, killing all five on board. The pilot attempted to abort the landing, but the aircraft struck approach lights and crashed into a pond.
19 January 1969
Wisconsin Air National Guard KC-97L 52-0904 crashed short of the runway at General Mitchell Airport, killing four of 11 on board.
17 September 1971
KC-97G IAF Serial 4X-FPR/033 of the Israeli Air Force, was shot down by Egyptian missiles over Suez, Egypt; seven of eight-man crew were killed.

Surviving aircraft

KC-97G/L at the Barksdale Global Power Museum

Airworthy

KC-97G

KC-97L

  • 52-2695 - privately owned in Greybull, Wyoming.
  • 52-2761 - privately owned in Greybull, Wyoming.
  • 53-208 - privately owned in Riverton, Wyoming.
  • 53-265 - privately owned in Riverton, Wyoming.
  • 53-350 - privately owned in Riverton, Wyoming.

On display

KC-97G #52-895 pictured at Rouge Valley International-Medford Airport in Medford, Oregon on 09AUG2024.

KC-97G

In popular culture

The KC-97 Stratofreighter is shown in both its cargo and tanker tasks in the 1955 film Strategic Air Command, refueling a B-47 in flight, and in the 1957 film Bombers B-52, refueling B-52s.

Specifications (KC-97L)

3-view line drawing of the Boeing KC-97G Stratofreighter

Data from USAF Museum, FAS: KC-97 Stratotanker

General characteristics

  • Crew: 6 (aircraft commander, copilot, navigator, flight engineer, radio operator, boom operator)
  • Capacity: 9,000 US gal (7,500 imp gal; 34,000 L) deliverable fuel
  • Length: 117 ft 5 in (35.79 m)
  • Wingspan: 141 ft 2 in (43.03 m)
  • Height: 38 ft 4 in (11.68 m)
  • Wing area: 1,734 sq ft (161.1 m)
  • Airfoil: root: Boeing 117 (22%); tip: Boeing 117 (9%)
  • Empty weight: 82,500 lb (37,421 kg)
  • Gross weight: 153,000 lb (69,400 kg)
  • Max takeoff weight: 175,000 lb (79,379 kg)
  • Powerplant: 4 × Pratt & Whitney R-4360-59 Wasp Major 28-cylinder air-cooled radial piston engines, 3,500 hp (2,600 kW) each
  • Powerplant: 2 × General Electric J47-GE-23 turbojet engines, 5,790 lbf (25.8 kN) thrust each in pylon mounted pods
  • Propellers: 4-bladed Hamilton Standard constant-speed fully-feathering propellers

Performance

  • Maximum speed: 400 mph (640 km/h, 350 kn)
  • Cruise speed: 230 mph (370 km/h, 200 kn)
  • Range: 2,300 mi (3,700 km, 2,000 nmi)
  • Service ceiling: 30,000 ft (9,100 m)

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

References

Citations

  1. Bach, p. 14
  2. ^ Swanborough / Bowers 1989, p. 127-129.
  3. Bach, p. 13
  4. Swanborough / Bowers 1989, p. 128.
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  8. ^ "Boeing KC-97L Stratofreighter". National Museum of the United States Air Force™. Retrieved 24 July 2024.
  9. Bach, p. 12
  10. Bowers 1989, p. 358-359.
  11. Bach, p. 4-7
  12. Bowers 1989, p. 353-358.
  13. Swanborough / Bowers 1989, p. 125-126.
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  18. Rarenstein, Charles (1984). Air Force combat wings: lineage and honors histories, 1947–1977. Office of Air Force History, U.S. Air Force. ISBN 0-912799-12-9.
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Bibliography

  • Bach, Martin: Boeing 367 Stratofreighter, Boeing 377 Stratocruiser, Aero Spacelines Guppies. NARA Verlag, Allershausen 1996, ISBN 3-925671-18-8.
  • Bowers, Peter M.: Boeing Aircraft since 1916. Putnam Aeronautical Books, London 1989, ISBN 0-85177-804-6.
  • Swanborough, Gordon and Bowers, Peter M.: United States Military Aircraft since 1909. Putnam Aeronautical Books, London 1989, ISBN 0-85177-816-X.

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