BOEING C-17 GLOBEMASTER III
Description:-
- Boeing C-17 Globe master III is a large military transport aircraft.
- It was developed by McDonnell Douglas from 1980's to early 1990's for United States Air Force(USAF).
- C-17 is named after the name of two previous piston-engined military cargo aircraft, the Douglas c-74 Globe master and Douglas c-124 Globe master II.
- C-17 performs the functions of transporting troops and cargo throughout the world, tactical airlift, medical evacuation and airdrop duties..
- Boeing merged with McDonnell Douglas continues to manufacture C-17's for export customers following the end of deliveries to U.S,Air Force.
- The C-17 is operated by U.S.Air Force,Australia,Canada,United Arab Emirates,United Kingdom,Qatar, NATO Heavy Airlift Wing and India.
Background and Design phase:-
- In 1970 the U.S.Airforce began looking for replacement for its Lockhead C-130 Hercules which is a tactical cargo aircraft.
- Advanced Medium STOL Transport(AMST) Competition was held between YC-14 proposed by Boeing and YC-15 proposed by McDonnell Douglas.
- Both entries exceeded specified requirements the AMST competition was cancelled before the selection of winner.
- The Air Force started the C-X program in November 1979 for developing larger AMST with longer range to augment its strategic airlift.
- The USAF needed increased strategic airlift capabilities to fulfill its airlift requirements.
- USAF set mission requirements and released a request for proposals(RFP) for C-X in October ,1980.
- Based on YC-15 McDonnell Douglas elected to develop a new air craft.
- Boeing bid an enlarged three-engine version of its AMST YC-14.
- Lockheed submitted two designs, a C-5 based design and an enlarged C-141 design.
- McDonnell Douglas was chosen to built its proposed aircraft and designated C-17 on 28 August 1981.C-17, new aircraft differs from YC-15 having increased size, swept wings and more powerful engines.
- C-17 performs the work done by C-141 and also fulfill some duties Lockheed C-5 Galaxy.
- Alternate proposals were made.
- The YC - 15 was trasferred to AMARC to be made worthy again under further flight test for the C-17 program in march 1997.
- Boeing proposed to cut the price of C-17 in the airforce brought for 60 more , and in august 2002 and the order was ordered to 180 aircrafts.
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Design :
- The C-17 is performed by four pratt & whiteney F-117-PW-100 turbofan engines, which are based on the commercial used on the Boeing 757.
- And providing enogh reverse thrust to back the aircraft up on the ground while taxxing.
- The thrust reverse can also be used in flight at idle - reverse for added drag in maximum rate descents.
- The aircraft requires a crew of three (pilot, copilot and load master) for cargo operations .
- Cargo is loaded through a large aft ramp that accommodates rolling stock such as 69-ton M1 Abrams main battle tank.
- The cargo floor has rollers for pallatized cargo that can be flipped to provide a floor flat suitable for vehicles and other rolling stock.
- The C-17 is designed to operate from runways as short as 3,500ft as narrow as 90ft .
- In addition it can be operated from unpaved , unimproved runways.
- The thrust reverse can be used to back the aircraft and reverse direction on narrow taxiways using a three or more turn points.
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Operational history :
NATO(Strategic Airlift capability program ) :
- A number of NATO countries signed a letter of intent to purchase C-17's on 19th july 2006,
- In 2006 farnborugh Airshow to participate in the joint and operation within NATO.
- The present members are Bulgaria, Estonia , Hungary, Luthiana , the Netherlands, norway , poland, Romania, Slovania, U.S.
- As well as the partnership for peace countries Finland and Sweden.
- The heavy airlift was hosted by hungary.
- Which acts as the flag nation.
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Qatar Emiri Airforce :
- It operates four C-17's .
- Boeing delivered first C-17 to qatar on 11 august 2009.
- And the second on 10 september 2009.
- A June 2013 article by the Newyork times states that qatar is using C-17's to ship the weapons from lybia to syrian via turkey, feeding syrain civil war.
Indian Airforce :
- The aircraft provides strategic airlift to deploy special forces in the event of national emergencies or terrorism.
- They are operated by the airforce at the terrain from himlayan air bases in north india at 13,000ft to indian ocean basis in south india .
- The skylords fly mission within the india to places like port blair, leh , thoise .
- They have been also sent on foriegn deployments.
Orders and deliveries :
International :
- During the summer 2008 it was reported that south korea has allocated funds for the purchase of three or four C-17 class for use in support in expeditionary experiments .
- In january 2010,india has requested 10 C- 17's through the US government Millitary sales programs and was approved by US congress in June 2010.
Deliveries
1991: 1
1992: 4
1993: 5
1994: 8
1995: 6
1996 6
1997: 7
1998: 10
1999: 11
2000: 13
2001: 14
2002: 16
2003: 16
2004: 16
2005: 16
2006: 16
2007: 16
2008: 16
2009: 16
2010: 14
2011: 12
2012: 10
2013: 4
Performance :
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Cruise speed : mach 0.74(450 knots, 515 mph, 830 kmp/h).
Range : 2,420mmi (2785mi,4482km) ;5610nmi(10390km) with paratroophs.
Service ceiling : 45.000ft (13,716m).
max wing load 150lb/ft2(750 kg/m2).
minimum thrust : 0.277.
takeoff run at MTOW : 7,600ft .
landing distance : 3,500ft.
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