Bell 47

Infobox Aircraft
name=Model 47/H-13 Sioux


caption=Model 47G
type=Multipurpose light helicopter
manufacturer=Bell Helicopter
designer=Arthur M. Young
first flight=8 December 1945
introduced=1946
retired=
status=
primary user=United States Army
more users=British Army
produced=
number built=
unit cost=
developed from=
variants with their own articles= Bell 201
Bell 207
Continental Copters El Tomcat

The Bell 47 was the first helicopter certified for civilian use, on 8 March 1946.cite web|url=http://www.helis.com/timeline/bell.php|title=Bell Helicopters|publisher=Helicopter History Site] cite web|url=http://www.modelaircraft.org/museum/bio/Young.pdf|title=Biography of ARTHUR MIDDLETON YOUNG] It was mostly designed by Arthur M. Young, who joined Bell Helicopter in 1941. More than 5,600 were produced until 1974, including 1,200 under license in Italy, 239 in Japan, and 239 in the UK.

The Bell 47 helicopter entered U.S. military service in late 1946, in a variety of versions and designations for three decades. In the Korean War (1950-1953) it was designated the H-13 Sioux by the United States Army, a highlight of its extensive career. It has also served as the helicopter of choice for basic helicopter flight instruction in many countries.

Design

Early models were variable in appearance, with open cockpits or sheet metal cabins, covered or open structures, some with four-wheel landing gear. Model D and Korean War types settled to a more utilitarian style. The most common model, the 47G introduced in 1953, can be recognized by the full bubble canopy, exposed welded-tube tail boom, saddle fuel tanks, and skid landing gear.

Later 47H and 47J Ranger models had a regular cabin with full cowling and monocoque tail boom. Engines were Franklin or Lycoming horizontally-opposed piston engines of 200 to 305 HP (150 to 230 kW). Seating varied from two to four. Many are still in use as trainers and in agriculture (as of 2005).

Operational history

NASA had a number of Bell 47s during the Apollo program, used by astronauts as a trainer for the Lunar Lander. Eugene Cernan had a near disastrous accident shortly before his flight to the moon on Apollo 17 by crashing one into the Indian River. [ [http://www.check-six.com/Crash_Sites/Cernan-Helo-1971.htm The Helicopter that Fell to Earth, Gene Cernan's Bell 47 Crash, January 23, 1971] , Check-Six.com.]

Initially, the US Navy procured several Bell 47s, designated HTL-1, between 1947 and 1958. The US Coast Guard evaluated this model, and procured two HTL-1s for multi-mission support in the New York Harbor. The most common US Navy version of the 47 was designated the HTL-4, and dispenses with the fabric covering on the tail boom. The US Coast Guard procured three HTL-5s in 1952 (similar to the HTL-4 but powered by a Franklin 0-335-5 engine) and used these until 1960.cite book|last=Pearcy|first=Arthur|title=A History of Coast Guard Aviation|publisher=Naval Institute Press|date=1989|id=ISBN 0-87021-261-3]

The Coast Guard procured two of Bell's Model 47G and designated them HUL-1G in 1959.

The Los Angeles County Fire Department in California used the Bell 47 as the department's very first aircraft in 1957. The British version of the 47G, called by the British Army the Sioux AH.1, was built by Westland Helicopters for use by the Army Air Corps, who used it until the early 1980s.Fact|date=February 2007 The Sioux military version was often equipped with military evacuation panniers, one to each skid, with an acrylic glass shield to protect the patient from wind.

H-13 were produced in Japan by a Bell and Kawasaki venture; this led to the Bell-Kawasaki KH-4 variant, essentially a three seat version of the Model 47.

Variants

: "Section source:" Aviastar [ [http://www.aviastar.org/helicopters_eng/bell_sioux.php Aviastar.org Model 47 History] Accessed 5 November 2007.]

Civilian

;Bell 47: Pre-production version, powered by a 133-kW (178-hp) Franklin piston engine.;Bell 47A: Improved version of the Bell 47, powered by a 117-kW (157-hp) Franklin O-335-1 piston engine. ;Bell 47B: Equivalent to the military YR-13/HTL-1, powered by the Franklin O-335-1 piston engine.;Bell 47B-3: Agricultural/utility version with open crew positions.;Bell 47C;Bell 47D: First to appear with a moulded 'goldfish bowl' canopy.;Bell 47D-1: Introduced in 1949, it had an open tubework tailboom reminiscent of the Bell Model 30, ship number 3, and a three-seat configuration.;Bell 47E: Powered by a 149-kW (200-hp) Franklin 6V4-200-C32 engine.;Bell 47F;Bell 47G: Combines a 149 kW Franklin engine with the three-seat configuration of the 47D-1 and introduced the saddle-bag fuel tank configuration.;Bell 47G-2: Powered by the Lycoming VO-435 engine. Produced under license by Westland for the UK military.;Bell 47G-2A: Powered by a 179 kW version of the VO-435.;Bell 47G-2A-1: Wider cabin, improved rotor blades and increased fuel capacity.;Bell 47G-3: Powered by a supercharged 168 kW Franklin 6VS-335-A.;Bell 47G-3B: Powered by a turbocharged 209 kW Avco Lycoming TVO-435.;Bell 47G-4: Three-seat helicopter powered by an Avco Lycoming VO-540 engine.;Bell 47G-5: A three-seat, utility version of the U.S. Air Force's UH-13J. It was marketed as the Model 47J Ranger and powered by an Avco Lycoming VO-435 engine. A two-seat agricultural version was later known as the Ag-5. The 47G-5 was the last model to be produced by Bell.;Bell 47H-1: De-luxe version.

Military

;YR-13/HTL-1: 28 Bell 47A helicopters procured by the U.S. Air Force for evaluation. The YR-13 was powered by a 117 kW Franklin O-335-1 piston engine. 10 of the aircraft were evaluated by the U.S. Navy as trainers.;YR-13A: 3 YR-13 aircraft winterized for cold-weather testing in Alaska.;HTL-2: US Navy equivalent of the commercial Model 47D. 12 built.;HTL-3: US Navy equivalent of the commercial Model 47E, powered by a 149-kW (200-hp) Franklin 6V4-200-C32 engine. Nine built.;H-13B: 65 aircraft ordered in 1948 by the U.S. Army. All Army versions were later named Sioux.;H-13C: 15 H-13B aircraft converted to carry external stretchers in 1952.;H-13D: Army two-seat version with skid landing gear, stretcher carriers, and Franklin O-335-5 engine.;OH-13E: H-13D configuration with three-seat aircraft with dual controls. ;XH-13F/Bell 201 : Modified Bell 47G powered by a Continental XT51-T-3 (Turbomeca Artouste) turboshaft. The first Bell helicopter powered by a turbine engine.;OH-13G: Introduced a small elevator on the tailboom.;UH-13J: Two Bell 47J Ranger aircraft utilizing the 179 kW Lycoming VO-435 engine acquired for VIP transport of the U.S. President by the U.S. Air Force. Originally designated as H-13J.;OH-13H/UH-13H: Equipped with a 186 kW Lycoming VO-435 engine. UH-13Hs were used by the U.S. Air Force.;OH-13K: Two converted H-13Hs with a larger diameter rotor and a 168 kW Franklin 6VS-335 engine for test evaluation.;TH-13L: Originally designated as the Navy HTL-4.;HTL-5: Utilized a Lycoming O-335-5 engine.;TH-13M: Incorporated a small movable elevator. Originally designated as the Navy HTL-6.;TH-13N:Two-seat, dual-control, instrument trainer with all-weather instrumentation. Originally designated as the Navy HTL-7.;UH-13P:Used aboard ice-breaking ships. Originally designated as the Navy HUL-1.;HH-13Q:Originally the HUL-1G, it was used by the U.S. Coast Guard for search and rescue.;UH-13R:Powered by an Allison YT63-A-3 turbposhaft engine. Original US Navy designation HUL-1M.;OH-13S:Three-seat observation helicopter to replace the OH-13H.;TH-13T:Two-seat instrument trainer for the U.S. Army based on the 47G-3B-1.;Sioux AH1:British military designation for both Agusta and Westland licence-built Model 47G-3B1s for the British Army.;Sioux HT2:British military designation for Westland licence-built Model 47G-3B1s for the Royal Air Force.

Conversions

;Agusta A.115 [cite book|last=Taylor|first=M. J. H.|year=1989|title=Jane's encyclopedia of aviation|location=London|publisher=Studio Editions|pages=40|id=ISBN 1851703241] [cite book|last=Simpson|first=R. W.|title=Airlife's Helicopters and Rotorcraft|year=1998|publisher=Airlife Publishing|location=Ramsbury|pages=37] :1971 Italian prototype of a Bell 47J with an unclad, tubular tail boom, and powered by a Turboméca Astazou II turboshaft engine.;Carson Super C-4;El Tomcat Mk.IIcite web|url=http://avia.russian.ee/helicopters_eng/bell_e1_tomcat.php|title=Continental Copters "El Tomcat"|work=Helicopter History Site] :Bell 47G-2 modified extensively for agricultural spraying by Continental Copters Inc. First flew in April 1959. Followed by further improved versions.;Kawasaki KH-4: Japanese production version with redesigned, lengthened cabin, and redesigned control system

Bell 47 redesignations

The Bell 47 was designated under multiple systems, see United States of America military aircraft designation systems. It is best known as the H-13 Sioux, though it actually started as the YR-13 in 1946. It became the H-13 under the USAF, though the USN had called it the HTL.

In post-1962 US designations combinations with the number 13 are often skipped, but in the older system the R-13/H-13 shared the number with the X-13 Vertijet and XP-13 Viper (see List of military aircraft of the United States)

In 1962 Army, Navy, and Air Force versions were redesignated under the new Tri-service system. Mainly, the H-13 based ones were converted to new standards which included a vehicle type designator and a mission symbol (2 letter prefix; OH, UH, XH, etc. This was a shift from the initial USAF 1948 system (with the numbered carried over from the USAAF/C system) and the USN 1922-1962 system to the new 1962 system. [cite web|url=http://www.personal.psu.edu/users/d/o/dob104/aviation/us/index.html|title=U.S. Military Aircraft and Weapon Designations|author=Derek Bridges|accessdate=2007-04-17]

Operators

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*: Icelandic Coast Guard
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*: USAF, US Army, US Navy, US Marines, US Coast Guard
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urvivors

* The Steven F. Udvar-Hazy Center, Washington Dulles International Airport in Chantilly, Virginia. includes the H-13 which was the first helicopter to carry an American President (Dwight D. Eisenhower) as well as the Model 30 predecessor and the Bell 47.
* The Alberta Aviation Museum in Edmonton, Alberta is restoring a 47G Model.
* The Pueblo Weisbrod Aircraft Museum, Pueblo, Colorado has a restored H-13G with a "M*A*S*H" look.
* The Museum of Modern Art (MoMA) in New York City has a [http://www.moma.org/collection/browse_results.php?object_id=2234 Bell 47D1] on permanent display.
* Castle Air Museum in Atwater, CA has a Bell H-13 with the M*A*S*H paint scheme in their "Hidden aircraft collection". Unfortunately, the H-13, along with other aircraft in their hidden collection, cannot be seen in the museum's main outdoor display because of weather conditions in the San Joaquin Valley.
* [http://www.aero-web.org/locator/manufact/bell/h-13.htm Aviation Enthusiast's List of H-13 Survivors]
* [http://www.adventureaviation.co.nz/ Adventure Aviation] in Tauranga, New Zealand uses a Bell 47G in a "M*A*S*H" paint scheme for tourist scenic flights.
* Bell 47G-2 AS7201 of the Armed Forces of Malta was formally retired on May 30, 2008 and donated to the [http://www.maltaaviationmuseum.com/ Malta Aviation Museum] at Ta'Qali.

pecifications (Bell 47G-3B)

aircraft specifications
plane or copter?=copter
jet or prop?=prop
ref=International Directiory of Civil AircraftFrawley, Gerard: "The International Directiory of Civil Aircraft, 2003-2004", page 42. Aerospace Publications Pty Ltd, 2003. ISBN 1-875671-58-7]

crew= 1 or 2
capacity= 1 passenger or 2 litters
length main= 31 ft 7 in
length alt= 9.63 m
span main= 37 ft 2 in
span alt= 11.32 m
height main= 9 ft 3 in
height alt= 2.83 m
area main= 1,085 ft²
area alt= 100.8 m²
airfoil=
empty weight main= 1,893 lb
empty weight alt= 858 kg
loaded weight main=
loaded weight alt=
useful load main= 1,057 lb
useful load alt= 482 kg
max takeoff weight main= 2,950 lb
max takeoff weight alt= 1,340 kg
more general=
engine (prop)=Lycoming TVO-435-F1A
type of prop=flat, six-cylinder, reciprocating engine
number of props=1
power main= 280 hp
power alt= 210 kW
power original=
max speed main= 91 knots
max speed alt= 105 mph, 169 km/h
cruise speed main= 73 knots
cruise speed alt= 84 mph, 135 km/h
never exceed speed main=
never exceed speed alt=
stall speed main=
stall speed alt=
range main= 214 nm
range alt= 245 mi, 395 km
ceiling main=
ceiling alt=
climb rate main= 860 ft/min
climb rate alt= 4.37 m/s
loading main=
loading alt=
thrust/weight=
power/mass main=
power/mass alt=
more performance=
armament=* 2 .30 caliber M37C machine guns on the XM1 Armament Subsystem or 2 7.62mm M60C machine guns on the M2 Armament Subsystem.
*8-tube launchers for 2.75" FFARs. [United States, 1966. pg. 2]
*Various other systems tested by the US including multiple tube 2.75" FFAR launchers, grenade launchers, modified infantry "Bazookas", small napalm canisters, and even a system capable of launching 4 Nord SS.10 anti-tank missiles. [Mutza, 1995. pgs. 27-33]
avionics=

Popular culture

The Bell 47 appeared, and played key roles, in film and television productions. It has been associated with both the "M*A*S*H" film, and the "M*A*S*H" television series, and the "Whirlybirds" TV series (1957–1959). [ [http://cellmath.med.utoronto.ca/B47/history/wbGuide/wbIntro.html University of Toronto Bell 47 Web site project] ]

ee also

aircontent
related=
* Bell 201/XH-13F
* Bell 206
* Bell 207 Sioux Scout
similar aircraft=
* OH-23 Raven Hiller Model 360
* Hughes 300/TH-55
* Schweizer 300C
lists=
* List of military aircraft of the United States
see also=

References

Notes

Bibliography

*cite book|last=Donald|first=David|year=1998|title=The complete encyclopedia of world aircraft|location=New York|publisher=Barnes & Noble Books|id=OCLC 52598955
*cite book|last=Jane|first=Fred T|coauthors=Taylor, Michael John Haddrick|year=1989|title=Jane's encyclopedia of aviation|location=New York|publisher=Portland House|id=ISBN 0517691868
*Mutza, Wayne. "H-13 Sioux Mini in Action". Carrollton, TX: Squadron/Signal Publications, 1995. ISBN 0-89747-329-0
*cite book|last=Pelletier|first=Alain J|year=1992|title=Bell aircraft since 1935|location=Annapolis, Md|publisher=Naval Institute Press|id=ISBN 1557500568
*cite journal|author=Riley, David|title=French Helicopter Operations in Algeria|journal=Marine Corps Gazette|date=February 1958 pp. 21-26.
*cite book|last=Shrader|first=Charles R.|year=1999|title=The first helicopter war: logistics and mobility in Algeria, 1954-1962|location=Westport, CT|publisher=Praeger|id=ISBN 0275963888
*cite book|last=Spenser|first=Jay P.|year=1998|title=Whirlybirds a history of the U.S. helicopter pioneers|location=Seattle|publisher=University of Washington Press in association with Museum of Flight|id=ISBN 0295980583
*United States, Headquarters Department of the Army, Army Concept Team in Vietnam. "Final Report of Essential Load of Scout Helicopters". Saigon, Vietnam: Army Concept Team in Vietnam, 1966.

External links

* [http://www.bell47.net/ Bell 47.net]
* [http://cellmath.med.utoronto.ca/B47/47Home.html Bell 47] Enthusiast site
* [http://www.californiasciencecenter.org/Exhibits/AirAndSpace/AirAndAircraft/Bell47G5/Bell47G5.php Model 47G] Museum site
* [http://www.airliners.net/info/stats.main?id=70 Model 47G specs] from "The International Directory of Civil Aircraft" by Gerard Frawley