Douglas AC-47 Spooky

AC-47 Spooky
An AC-47D, 43-49010, on the ground at Udorn Royal Thai Air Force Base, June 1970. A C-47 is displayed at the Air Force Armament Museum marked as this aircraft.
Role	Ground-attack aircraft and close air support gunship
Manufacturer	Douglas Aircraft Company
Introduction	1965
Status	In service in Colombia
Primary users	United States Air Force Vietnam Air Force Royal Lao Air Force Colombian Air Force
Number built	53
Developed from	C-47 Skytrain

The Douglas AC-47 Spooky (also nicknamed "Puff, the Magic Dragon") was the first in a series of gunships developed by the United States Air Force during the Vietnam War. More firepower than could be provided by Light and medium ground-attack aircraft was thought to be needed in some situations when ground forces called for close air support.

Design and development

The AC-47 was a United States Air Force C-47, (the military version of the DC-3) that had been modified by mounting three 7.62mm General Electric miniguns to fire through two rear window openings and the side cargo door, all on the left (pilot's) side of the aircraft, and the modified craft's primary function was close air support for ground troops. Other armament configurations could also be found on similar C-47 based aircraft around the world. The guns were actuated by a control on the pilot's yoke whereby he could control the guns either individually or together, although gunners were also among the crew to assist with gun failures and similar issues. It could orbit the target for hours providing suppressing fire over an elliptical area approximately 52 yd (47.5 m) in diameter, placing a round every 2.4 yd (2.2 m) during a 3-second burst. The aircraft also carried flares that it could drop to illuminate the battleground.

AC-47

The AC-47 had no previous design to gauge how successful it would be because it was the first of its kind. The USAF found itself in a precarious situation when requests for additional gunships began to come in because simply lacked miniguns to fit additional aircraft after the first two conversions. The next four aircraft were equipped with 10 .30 caliber AN/M2 machine guns. However, these weapons, using World War II and Korean War ammunition stocks, were quickly discovered to jam easily, produce large amounts of gases from firing, and, even in 10-gun groups, only provide the density of fire of a single minigun. All four of these aircraft were retrofitted to the standard armament configuration when additional miniguns arrived.

The AC-47 initially used SUU-11/A gun pods that were installed on locally fabricated mounts for the gunship application. Emerson Electric eventually developed the MXU-470/A to replace the gun pods, which were also used on subsequent gunships.

Operational history

United States Air Force

AC-47 at Nha Trang Air Base in South Vietnam

In August 1964, years of fixed wing gunship experimentation reached a new peak with Project Tailchaser under the direction of Capt. John C. Simons. This test involved the conversion of a single Convair C-131B to be capable of firing a single GAU-2/A Minigun at a downward angle out of the left side of the aircraft. Even crude grease pencil crosshairs were quickly discovered to enable a pilot flying in a pylon turn to hit a stationary area target with relative accuracy and ease. The Armament Development and Test Center (ADTC) tested the craft at Eglin Air Force Base, Florida, but lack of funding soon suspended the tests. In 1964 Capt. Ron W. Terry returned from temporary duty in Vietnam as part of an Air Force Systems Command team reviewing all aspects of air operations in counter-insurgency warfare, where he had noted the usefulness of C-47s and C-123s orbiting as flare ships during night attacks on fortified hamlets. He received permission to conduct a live-fire test using the C-131 and revived the side-firing gunship program.

By October, Capt. Terry's team under Project Gunship provided a C-47D, which was converted to a similar standard as the Project Tailchaser aircraft and armed with three Miniguns, which were initially mounted on locally fabricated mounts—essentially strapped gun pods intended for fixed wing aircraft (SUU-11/A)--onto a mount allowing them to be fired remotely out the port side. Captain Terry and a testing team arrived at Bien Hoa Air Base, South Vietnam, on 2 December 1964, with equipment needed to modify two C-47s. The first test aircraft (43-48579, a C-47B-5-DK mail courier converted to C-47D standard by removal of its superchargers) was ready by 11 December, the second by 15 December, and both were allocated to the 1st Air Commando Squadron for combat testing. The newly dubbed "FC-47" often operated under the radio call sign "Puff". Its primary mission involved protecting villages, hamlets and personnel from mass attacks by VC guerrilla units.

Puff's first significant success occurred on the night of 23–24 December 1964. An FC-47 arrived over the Special Forces outpost at Tranh Yend in the Mekong Delta just 37 minutes after an air support request, fired 4,500 rounds of ammunition, and broke the Viet Cong attack. The FC-47 was then called to support a second outpost at Trung Hung, about 20 miles away. The aircraft again blunted the VC attack and forced a retreat. Between 15 and 26 December, all the FC-47s 16 combat sorties were successful. On 8 February 1965, an FC-47 flying over the Bong Son area of Vietnam’s Central Highlands demonstrated its capabilities in the process of blunting a Vietcong offensive. For over four hours, it fired 20,500 rounds into a Viet Cong hilltop position, killing an estimated 300 Vietcong troops. The early gunship trials were so successful that the second aircraft was returned to the United States early in 1965 to provide crew training. In July 1965, Headquarters USAF ordered TAC to establish an AC-47 squadron. By November 1965, a total of five aircraft were operating with the 4th Air Commando Squadron, activated in August as the first operational unit, and by the end of 1965, a total of 26 had been converted. Training Detachment 8, 1st Air Commando Wing, was subsequently established at Forbes AFB, Kansas. In Operation Big Shoot, the 4th ACS in Vietnam grew to 20 AC-47s (16 aircraft plus four reserves for attrition). The 4th ACS deployed to Tan Son Nhut Air Base, Vietnam, on 14 November 1965. Now using the call sign "Spooky," each of its three 7.62 mm miniguns could selectively fire either 50 or 100 rounds per second. Cruising in an overhead left-hand orbit at 120 knots air speed at an altitude of 3,000 ft, the gunship could put a bullet or glowing red tracer (every fifth round) bullet into every square yard of a football field-sized target in potentially less than 10 seconds. And, as long as its 45-flare and 24,000-round basic load of ammunition held out, it could do this intermittently while loitering over the target for hours. In May 1966, the squadron moved north to Nha Trang Air Base to join the newly activated 14th Air Commando Wing. The 3rd Air Commando Squadron was activated at Nha Trang on 5 April 1968 as a second AC-47 squadron, with both squadrons redesignated Special Operations Squadrons on 1 August 1968. Flights of both squadrons were stationed at bases throughout South Vietnam, and one flight of the 4th SOS served at Udorn Royal Thai Air Force Base with the 432nd Tactical Reconnaissance Wing. The superb work of the two AC-47 squadrons, each with 16 AC-47s flown by aircrews younger than the aircraft they flew, was undoubtedly a key contributor to the award of the Presidential Unit Citation to the 14th Air Commando Wing in June 1968.

MXU-470/A Minigun modules in an AC-47.

One of the most publicized battles of the Vietnam War was the siege of Khe Sanh in early 1968, known as "Operation Niagara." More than 24,000 tactical and 2700 B-52 strikes dropped 110,000 tons of ordnance in attacks that averaged over 300 sorties per day. During the two and a half months of combat in that tiny area, fighters were in the air day and night. At night, AC-47 gunships kept up a constant chatter of fire against enemy troops. During darkness, AC-47 gunships provided illumination against enemy troops. The AC-47D gunship should not be confused with a small number of C-47s which were fitted with electronic equipment in the 1950s. Prior to 1962, these aircraft were designated AC-47D. When a new designation system was adopted in 1962, these became EC-47Ds. The original gunships had been designated FC-47D by the United States Air Force, but with protests from fighter pilots, this designation was changed to AC-47D during 1965. Of the 53 aircraft converted to AC-47 configuration, 41 served in Vietnam and 19 were lost to all causes, 12 in combat. Combat reports indicate that no village or hamlet under Spooky Squadron protection was ever lost, and there are a plethora of reports from civilians and military personnel about AC-47s coming to the rescue and saving their lives.

As the United States began Project Gunship II and Project Gunship III, many of the remaining AC-47Ds were transferred to the Vietnam Air Force (VNAF), the Royal Lao Air Force (RLAF), and to Cambodia, after Prince Sihanouk was deposed in a coup by General Lon Nol.

A1C John L. Levitow, an AC-47 loadmaster with the 3rd SOS, received the Medal of Honor for saving his aircraft, Spooky 71, from destruction on 24 February 1969 during a fire support mission at Long Binh. The aircraft was struck by an 82 mm mortar round that inflicted 3,500 shrapnel holes, wounding Levitow 40 times, but he used his body to jettison an armed magnesium flare, which ignited shortly after Levitow ejected it from the aircraft, allowing the AC-47 to return to base.

Other air forces

In 2006, Colombia started operating retrofitted AC-47s, where they are known by civilians as Avion fantasma (ghost planes). They are successfully operated by the Colombian Air Force in counter-insurgency operations in conjunction with AH-60 Arpia helicopters (an armed variant of the UH-60) and Cessna A-37 Dragonflys against local illegal armed groups. These are five Basler BT-67s purchased by Colombia with .50 in (12.7 mm) GAU-19/A machine guns slaved to a Forward Looking Infrared (or FLIR) system. They also have the ability to carry bombs. At least one has been seen fitted with one GAU-19/A and a 20 mm cannon, most likely a French made M621. The BT-67 is a variant of the C-47/DC-3 modified by the Basler Corporation of Oshkosh, Wisconsin.

In 1970, the Indonesian Air Force converted a formerly civilian DC-3. The converted aircraft was armed with three .50 caliber machine guns. During 1975 the Indonesian Air Force used its "AC-47" in the Indonesian invasion of East Timor to attack the city of Dili. Later, the aircraft was used in Indonesian military CAS (Close Air Support) missions in East Timor. A retirement date is unknown.

In late 1984–85, the United States supplied two AC-47 gunships to the El Salvador Air Force (FAS) and trained aircrews to operate the system. The AC-47 gunship carried three .50-caliber machine guns and could loiter and provide heavy firepower for army operations. As the FAS had long operated C-47s, it was easy for the United States to train pilots and crew to operate the aircraft as a weapons platform. By all accounts, the AC-47 soon became probably the most effective weapon in the FAS arsenal. Variants of the AC-47 based on various iterations of the airframe including the BT-67, have been used by Laos, Cambodia, South Africa, El Salvador and Rhodesia, to name just a few, and with a variety of weapons configurations including Gatling guns of numerous types, various medium and heavy machine guns, and larger autocannon (South African "Dragon Daks" were known to fit 20 mm cannons). The Republic of China Air Force (Taiwanese Air Force) also converted some of its C-47 to gunships. These machines were armed with M2 machine guns.

Operators

Current Operators

Colombia

• Colombian Air Force

El Salvador

• Air Force of El Salvador

Former Operators

Cambodia

• Khmer National Air Force

Indonesia

• Indonesian Air Force operated a number of ex-civilian C-47 converted into Gunship

Laos

• Royal Lao Air Force

Philippines

• Philippine Air Force

Rhodesia

• Rhodesian Air Force operated locally built gunship modification of C-47 aircraft.

South Africa

• South African Air Force

South Vietnam

• Vietnam Air Force

United States

• United States Air Force operated during Vietnam War. Replaced by AC-130H/U/W

Thailand

• Royal Thai Air Force

Specifications (AC-47)

General characteristics

• Crew: 8: pilot, copilot, navigator, flight engineer, loadmaster, 2 gunners and a South Vietnamese observer
• Length: 64 ft 5 in (19.6 m)
• Wingspan: 95 ft 0 in (28.9 m)
• Height: 16 ft 11 in (5.2 m)
• Wing area: 987 ft² (91.7 m²)
• Empty weight: 18,080 lb (8,200 kg)
• Loaded weight: 33,000 lb (14,900 kg)
• Powerplant: 2 × Pratt & Whitney R-1830 radial engines, 1,200 hp (895 kW) each

Performance

• Maximum speed: 200 kn (230 mph, 375 km/h)
• Cruise speed: 150 kn (175 mph, 280 km/h)
• Range: 1,890 nmi (2,175 mi, 3,500 km)
• Service ceiling: 24,450 ft (7,450 m)
• Rate of climb: ft/min (m/s)
• Wing loading: 33.4 lb/ft² (162.5 kg/m²)
• Power/mass: 0.15 hp/lb (240 W/kg)

Armament

• Guns:
  
  • 3× 7.62 mm General Electric GAU-2/M134 miniguns, 2,000 rpm or
  • 10× .30 in Browning AN/M2 machine guns
• 48 × Mk 24 flares

Aircraft on display

• AC-47D Spooky, s/n 43-15510 is on display at the Air Commando Park, Hurlburt Field, Florida.

In popular culture

German Thrash metal band Sodom's 1989 album Agent Orange, revolving largely around Vietnam War themes, features a track named "Magic Dragon". The album's cover art drawing also depicts the gunner of an AC-47 in action.

The development and early deployment of the AC-47 is the subject of The Gooney Bird by William C. Anderson. Anderson went to Vietnam to research this novel, which features a fiction story written around a number of historical facts.

In the film The Green Berets, an AC-47 strike enables the American and South Vietnamese forces to retake their firebase, after losing it in an all-night battle.

AC-47 also appears in the first-person shooter Battlefield Vietnam.

See also

• Douglas C-47 Skytrain
• Douglas DC-3
• AC-119 gunship
• Lockheed AC-130
• Project Gunship I - II - III
• List of attack aircraft
• List of military aircraft of the United States
• Pylon turn

References

Bibliography

• Donald, David. The Complete Encyclopedia of World Aircraft. New York: Barnes & Noble, 1997. ISBN 0-7607-0592-5.
• Flintham, Victor. Air Wars and Aircraft: A Detailed Record of Air Combat, 1945 to the Present. New York: Facts on File, 1990. ISBN 0-8160-2356-5.
• Francillon, René J. McDonnell Douglas Aircraft Since 1920. London: Putnam & Company Ltd., 1979. ISBN 0-370-00050-1.
• Gradidge, Jennifer M. The Douglas DC-1, DC-2, DC-3 - The First Seventy Years (two volumes). Tonbridge, UK: Air-Britain (Historians) Ltd., 2006. ISBN 0-85130-332-3.
• Project CHECO. Contemporary Historical Evaluation of Combat Operations: Fixed Wing Gunships in Southeast Asia, Retrieved: 22 November 2012.

External links

• USAF museum Douglas AC-47D "Spooky"
• AC-47 at Theaviationzone.com
• AC-47 at Globalsecurity.org
• AC-47 at dc3history.org
• AC-47 at petester.com