TheBell H-13 Sioux is an American single-enginelight helicopter built and produced byBell Helicopter for the military and licence-produced byWestland Aircraft for the British military as theSioux AH.1 andHT.2. It was the first helicopter to be certified for civil use.[2]
H-13 Sioux | |
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An OH-13 overRIAT, 2022 | |
Role | Light observationhelicopter |
National origin | United States |
Manufacturer | Bell Aircraft Bell Helicopter |
First flight | 8 December 1945 (Bell 47 prototype)[1] |
Status | Retired |
Primary users | United States Army United States Air Force United States Navy British Army [Iran] |
Number built | At least 2,407 |
Developed from | Bell 47 |
Variants | Bell 201 |
Developed into | Bell 207 Sioux Scout |
Development
editThis sectionneeds expansion with: Fill in some details on early development. You can help byadding to it.(March 2009) |
In 1947, theUnited States Army Air Forces (later theUnited States Air Force) ordered the improvedBell Model 47A. Most were designatedYR-13 and three winterized versions were designatedYR-13A. TheUnited States Army first ordered Bell 47s in 1948 under the designationH-13. These would later receive the nameSioux.[3]
Initially, theUnited States Navy procured several Bell 47s, designatedHTL-1, between 1947 and 1958. TheUnited States Coast Guard evaluated this model, and procured two HTL-1s for multi-mission support in the New York Harbor. The most common U.S. Navy version of the 47 was designated theHTL-4, and dispenses with the fabric covering on the tail boom. The U.S. Coast Guard procured threeHTL-5s in 1952 (similar to the HTL-4 but powered by a Franklin O-335-5 engine) and used these until 1960.[4] The Coast Guard procured two of Bell's Model 47G and designated themHUL-1G in 1959.[4]
The H-13 was one of the principal helicopters used by the U.S. Army during theKorean War, with the H-13D variant being the most prevalent. During the war it was used in a wide variety of roles including observation, reconnaissance, and medevac. From its role in medevac flights, it gained the nickname "Angel of Mercy". It was also used as an observation helicopter early in theVietnam War, before being replaced by theHughes OH-6 Cayuse in 1966.
The Bell 47 was ordered by the British Army as the Sioux to meet specification H.240, withlicensed production byWestland Helicopters. In order to comply with the terms of its licence agreement withSikorsky Aircraft, which prevented it building a U.S. competitor's aircraft, Westland licensed the Model 47 fromAgusta, who had purchased a license from Bell.[5] the first contract was for 200 helicopters. The first 50 helicopters of the contract were built byAgusta at Gallarate in Italy followed by 150 built by Westland at Yeovil. The first Westland Sioux made itsmaiden flight on 9 March 1965.[6]
Design
editThe Sioux is a single-engine, single-rotor, three-seatobservation andbasic training helicopter. In 1953, the Bell 47G design was introduced. It can be recognized by the full"soap bubble" canopy (as its designerArthur M. Young termed it),[7] exposed welded-tube tail boom, saddlefuel tanks and skid landing gear. In its UH-13J version, based on the Bell 47J, it had a metal-clad tail boom and fuselage and an enclosed cockpit and cabin.
The H-13 and its military variants were often equipped withmedical evacuation panniers, one to each skid, with anacrylic glass shield to protect the patient from wind.
The development of the Sioux was helped greatly by Bell's implementation of a short weightedgyro-stabilizer bar at 90° beneath and to the main rotor. It hadstreamlinedcounterweights at both tips and was linked so it determined which plane the rotor was in and kept it horizontal.[8] The stabilizer, which was connected to thecyclic pitch control, acted as a hingedflywheel using gyroscopic inertia to keep the rotor blades in plane and independent offuselage movement due to wind. It ensured that the system had enoughinertia due to flight as well, soautorotation would function in case of engine failure.[9]
A single 260 hpLycoming VO-435piston engine was fitted to the 47G variant. Fuel was fed from two high-mounted external tanks. A single two-bladed rotor with short inertial stabilising minor blades was used on the Sioux.[6]
Variants
editMilitary
edit- YR-13
- [a] 28 Bell 47A helicopters procured by the United States Army Air Forces for evaluation. The YR-13 was powered by a 175 hp (130 kW) Franklin O-335-1 piston engine. 10 of the aircraft were transferred to the U.S. Navy for evaluation as theHTL-1, with two HTL-1s later transferred to US Coast Guard.[11]
- YR-13A
- 3 YR-13 aircraft winterized for cold-weather testing in Alaska. RedesignatedYH-13A in 1948.[12]
- HTL-2
- US Navy equivalent of the commercial Model 47D. 12 built.[13]
- HTL-3
- US Navy equivalent of the commercial Model 47E, powered by a 200 hp (149 kW) Franklin 6V4-200-C32 engine. Nine built.
- H-13B
- 65 aircraft ordered in 1948 by the U.S. Army.[12] All Army versions were later named Sioux.
- YH-13C
- One H-13B used as engineering testbed. Fitted with skid undercarriage and open, uncovered tailboom.[12]
- H-13C
- 16 H-13B aircraft converted to carry external stretchers in 1952, with skid landing gear and open tail boom of YH-13C.[12]
- H-13D
- Army two-seat version based on commercial model 47D-1, with skid landing gear, stretcher carriers, and Franklin O-335-5 engine. 87 built.[12]
- OH-13E
- H-13D configuration with three-seat aircraft with dual controls. 490 built.[12]
- XH-13F/Bell 201
- Modified Bell 47G powered by a Continental XT51-T-3 (Turbomeca Artouste) turboshaft.[12] The first Bell helicopter powered by a turbine engine.
- OH-13G
- Three-seater based on commercial model 47-G. Introduced a small elevator on the tailboom. 265 delivered to US Army.[14]
- OH-13H/UH-13H
- Based on 47G-2. Equipped with a 250 hp (186 kW) Lycoming VO-435 engine. At least 453 acquired by US Army.[14] UH-13Hs were used by the U.S. Air Force.
- UH-13J
- TwoBell 47J-1 Rangers acquired by the U.S. Air Force for VIP transport of the U.S. President. Originally designatedH-13J.
- OH-13K
- Two converted H-13Hs with a larger diameter rotor and a 225 hp (168 kW) Franklin 6VS-335 engine for test evaluation.
- TH-13L
- Originally designated as the NavyHTL-4.
- HTL-5
- Utilized a Franklin O-335-5 engine.
- TH-13M
- Incorporated a small movable elevator. Originally designated as the NavyHTL-6.
- HH-13Q
- Originally theHUL-1G, it was used by the U.S. Coast Guard for search and rescue.
- UH-13R
- Powered by an Allison YT63-A-3 turboshaft engine. Original US Navy designationHUL-1M.
- OH-13S
- Three-seat observation helicopter based on 47G-3B to replace the OH-13H. 265 received by US Army.[14]
- TH-13T
- Two-seat instrument trainer for the U.S. Army based on the 47G-3B-1, powered by 270 hp (201 kW) Lycoming TVO-435-D1B. 411 purchased.[14]
- Sioux AH.1
- General purpose helicopter for the British Army, 50 built by Agusta (Agusta-Bell 47G-3B1) and 250 built by Westland (Westland-Agusta-Bell 47G-3B1).[15] A small number also used by3 Commando Brigade Air Squadron of the Royal Marines.
- Sioux HT.2
- Training helicopter for theRoyal Air Force, 15 built by Westland.
- H.7
- (Thai:ฮ.๗)Royal Thai Armed Forces designation for the OH-13H.[16]
Civil
edit- Texas Helicopter M74 Wasp
- Texas Helicopter Corporation single-seat conversion of OH-13E helicopters for agricultural use, powered by 200 hp (150 kW)Lycoming TVO-435-A1E engines. Certified 1976.[17]
- Texas Helicopter M74A
- Texas Helicopter Corporation single-seat conversion of OH-13H helicopters for agricultural use, powered byLycoming TVO-435 engine rated at 240 hp (180 kW) for 2 minutes. Certified 1977.[17]
- Texas Helicopter M79S Wasp II
- Texas Helicopter Corporation conversion for agricultural use, with tandem seating and stub wing fuel tanks. Powered byLycoming TVO-435 engine rated at 270 hp (200 kW) for 5 minutes.[17]
- Texas Helicopter M79T Jet Wasp II
- Texas Helicopter Corporation conversion of Bell 47G helicopters for agricultural use, powered by 420 hp (310 kW)Soloy-Allison 250-C20S engines.
Operators
edit- Royal Canadian Navy[23]
- VX-10 Squadron
- South Vietnam Air Force operated several helicopters since April 1956.
- 1st Helicopter Squadron
- 2nd Helicopter Squadron
- Sri Lanka Air Force
- No.5 Squadron[41]
Surviving aircraft
editCanada
edit- RCN 1387 – HTL-6 on static display at theCanada Aviation and Space Museum inOttawa,Ontario.[52]
Germany
edit- 58-5348 – OH-13H on static display at theHubschraubermuseum Bückeburg inBückeburg, Lower Saxony.[53]
- XT548 – Sioux AH.1 on static display at theFlugausstellung Hermeskeil inHermeskeil, Rhineland-Palatinate.[54][55]
New Zealand
edit- H-13 Sioux (Bell 47-G3) registration NZ3705 Sioux on display at theRoyal New Zealand Air Force Museum atWigram. The aircraft is displayed in its RNZAF colour scheme when it was retired from service in 2012.NZ3705[56]
Pakistan
edit- OH-13 on static display at thePakistan Army Museum inRawalpindi, Punjab.[citation needed]
South Africa
edit- XT562 – Bell 47 on static display at Port Elizabeth Branch of theSouth African Air Force Museum inPort Elizabeth, Eastern Cape.[57]
South Korea
edit- H-13 on static display at theWar Memorial of Korea inSeoul.[citation needed]
Spain
edit- OH-13H on static display at the Aeronautical Laboratory of the School of Industrial and Aeronautical Engineering of thePolytechnic University of Catalonia inTerrassa, Barcelona.[citation needed]
Taiwan
edit- 1101 – OH-13H on display atAviation Education Exhibition Hall, a subsidiary of theRepublic of China Air Force Academy.[42]
- 2110 – OH-13H on display atLongtan Sports Park atTaoyuan City, Taiwan.[58][59]
Thailand
edit- 56-2182/H7-9/15 – OH-13H on display at theRoyal Thai Air Force Museum inBangkok, Thailand.[60][61]
United Kingdom
editAirworthy
- XT131 (G-CICN) - Sioux AH.1 airworthy with theHistoric Army Aircraft Flight based atAAC Middle Wallop.[62]
On display
- XT148 – Sioux AH.1 under restoration[citation needed] at theNorth East Land, Sea and Air Museums inSunderland, Tyne and Wear.[63]
- XT190 – Sioux AH.1 on static display atThe Helicopter Museum inWeston-super-Mare, Somerset.[64][65]
- XT200 – Sioux AH.1 on static display at theNewark Air Museum inNewark, Nottinghamshire.[66]
United States
edit- Airworthy
- OH-13H
- 58-1528 – operated by Ocean Air Inc. ofEugene, Oregon.[67][68]
- TH-13T
- 65-8040 – based at theCavanaugh Flight Museum inAddison, Texas. It is painted as a H-13D.[69][70] Removed from public display when the museum indefinitely closed on 1 January 2024. To be moved toNorth Texas Regional Airport inDenison, Texas.[71]
- On display
- H-13B
- 48-0796 – South Carolina Military Museum inColumbia, South Carolina. It is the first H-13B airframe, serial number 101, and came off the production line in mid-July 1948.[72][73]
- H-13D
- OH-13D
- 51-2456 -United States Army Medical Department Museum located on base atFort Sam Houston, inSan Antonio, Texas.[76]
- OH-13E
- 51-13934 –Evergreen Aviation & Space Museum inMcMinnville, Oregon.[77][78]
- 51-14010 –U.S. Army Transportation Museum atJoint Base Langley–Eustis nearNewport News, Virginia.[79]
- 51-14062 or 51-14077 –Aviation Hall of Fame and Museum of New Jersey inTeterboro, New Jersey.[80]
- 51-14175 –Yanks Air Museum inChino, California.[81][82]
- 51-14193 –United States Army Aviation Museum inEnterprise, Alabama.[74][83]
- 51-14218 –United States Army Aviation Museum inEnterprise, Alabama.[74][84]
- OH-13G
- H-13H
- OH-13H
- 59-4949 - in use as instructional airframe atPortland Community College inPortland, Oregon.
- UH-13H
- 56-2217 –Castle Air Museum inAtwater, California.[88][89]
- OH-13S
- 63-9085 –Texas Air & Space Museum inAmarillo, Texas. It wears a "M*A*S*H" paint scheme and is on loan from Amarillo College.[90]
- 64-15338 –Flying Leatherneck Aviation Museum inSan Diego, California.[91]
- 64-15393 –Intrepid Sea, Air & Space Museum inNew York, New York.[92]
- TH-13T
- 67-15963 –Pueblo Weisbrod Aircraft Museum inPueblo, Colorado. It has a "M*A*S*H" paint scheme.[93][94]
- 67-17053 –Hill Aerospace Museum inOgden, Utah.[95]
- HTL-2
- 122952 –Pima Air & Space Museum inTucson, Arizona.[96]
- HTL-4
- HTL-6
- 142377 –National Museum of Naval Aviation inPensacola, Florida.[97]
- 142394 –Flying Leatherneck Aviation Museum inSan Diego, California.[91]
- HTL-7
- 145842 –Pima Air & Space Museum inTucson, Arizona.[98]
- Unknown
- Fantasy of Flight inPolk City, Florida has an airworthy XH-13F.[99][100][101]
- U.S. Veterans Memorial Museum, Huntsville, Alabama has an H-13D on display.[102]
Specifications (Sioux AH.1)
editData from Newark Air Museum,[103] Britains Small Wars.[104]
General characteristics
- Crew: 1
- Capacity: 3
- Length: 31 ft 7 in (9.63 m)
- Height: 9 ft 8 in (2.95 m)
- Gross weight: 2,952 lb (1,339 kg)
- Powerplant: 1 ×Lycoming TVO-435-A1A six-cylinder, horizontally opposed piston, 260 hp (190 kW)
- Main rotor diameter: 37 ft 0 in (11.28 m)
Performance
- Maximum speed: 105 mph (169 km/h, 91 kn)
- Cruise speed: 84 mph (135 km/h, 73 kn)
- Range: 273 mi (439 km, 237 nmi)
- Service ceiling: 16,100 ft (4,900 m)
Armament
Twin .30 in (7.62 mm)Machine guns[b]
Popular culture
editThe H-13 has appeared, and played key roles, in many film and television productions. It has been associated with both theM*A*S*H TV series (1972–1983) and thefilm of the same name (1970), prominently featuring the H-13 in its opening credits, and played a central role in theseries finale, which still holds the record as thehighest rated single episode broadcast in America.[106][107] The series helped popularize the H-13 as the helicopter most people now associate with theKorean War.[108] The H-13 also played a key role in theWhirlybirds TV series (1957–1959).[109][110]
See also
editRelated development
Aircraft of comparable role, configuration, and era
Related lists
Notes
edit- ^In the military of the United States, the Bell 47 carried several designations prior to 1962.R-13 was the first designation by theUnited States Army Air Forces, while the Navy designated their training version asHTL. In 1948, theUnited States Air Force changed the designation toH-13 which was also adopted by the Army, adding the nameSioux. The Navy and Coast Guard designated utility models asHUL. In 1962, under a joint designation system created by the Department of Defense, the designations for all of the helicopters were changed to a mission symbol followed by the vehicle type designator creating a two-letter prefix (OH, UH, XH, etc.), but the Bell 47 retained its original series number, 13 and the Army's popular name. To denote different models, a letter suffix was appended to the designation.[10]
- ^The OH-1 was capable of carrying twinM37C .30 caliber machine guns, or twinM60 machine guns.[105] They rarely did so however, because according to aMilitary Channel documentary on theAH-1 attack helicopter ("World's Deadliest Aircraft" series), the guns' recoil was too great a strain on the engines.
References
editFootnotes
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I thought the bubble was a great idea, and we tried it. It consisted of taking a large sheet of Plexiglas, and a plywood form, cut for the final dimension for the outside of the bubble, then heating the Plexiglas, putting it under the plywood form, letting air pressure come up through the middle, and it would blow just like asoap bubble. And, then we had a gauge saying how far to blow, and when it reached that point, we turned off the air pressure.
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edit- Boulay, Phillipe (November 1984). "Le vol de Gendarme".Le Fana de l'Aviation (in French). No. 180. pp. 4–7.
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- Frawley, Gerard (2003).The International Directory of Civil Aircraft, 2003–2004. Fyshwick, ACT, Australia: Aerospace Publications Pty Ltd.ISBN 1-875671-58-7.
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- Mutza, Wayne (1995).H-13 Sioux Mini in Action. Carrollton, TX, USA: Squadron/Signal Publications.ISBN 0-89747-345-0.
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External links
edit- Bell 47.net
- Bell 47 Project: University of Toronto at theWayback Machine (archived January 30, 2009)
- Model 47G specs fromThe International Directory of Civil Aircraft by Gerard Frawley