V-22 Osprey

Infobox Aircraft
name=V-22 Osprey


caption=U.S. Marines jump from an Osprey.
type=VTOL transport
national origin = United States
first flight=19 March avyear|1989
introduction=8 December avyear|2005
manufacturer= Bell Helicopter Boeing Helicopters
primary user= United States Marine Corps
more users= United States Air Force
number built =
program cost= US$50.5 billion (2005) [http://digital.library.unt.edu/govdocs/crs/permalink/meta-crs-7265:1 "V-22 Osprey Tilt-Rotor Aircraft"] , CRS Report for Congress, 4 August 2005]
unit cost = US$68 million in 2008 (CV-22 flyaway cost) [http://www.saffm.hq.af.mil/shared/media/document/AFD-080204-081.pdf "FY 2009 Budget Estimates."] United States Air Force. February 2008, p. 133.]
developed from = Bell XV-15
variants with their own articles =

The V-22 Osprey is a multi-mission, military tiltrotor aircraft with both a vertical takeoff and landing (VTOL) and short takeoff and landing (STOL) capability. It is designed to perform missions like a conventional helicopter with the long-range, high-speed cruise performance of a turboprop aircraft. The V-22 was developed by Bell Helicopter, which manufactures it in partnership with Boeing Helicopters. The initial operators are the United States Marine Corps and Air Force. The FAA classifies the Osprey as a model of powered lift aircraft.

Development

The Department of Defense began the V-22 program in 1981, first under Army leadership, then the Navy/Marine Corps later took the lead in developing what was then known as the Joint-service Vertical take-off/landing Experimental (JVX) aircraft. [http://www.afotec.af.mil/news/story.asp?id=123057888 "The Long Road: AFOTEC's Two-Plus Decades of V-22 Involvement"] , US Air Force, 1 August 2007.] [ [http://www.history.army.mil/books/DAHSUM/1982/ch09.htm "Department of the Army, Historical Summary"] , Chapter 9, Center Of Military History, United States Army, 1988, ISSN 0092-7880.] Full-scale development of the V-22 tilt-rotor aircraft began in 1986. [http://www.history.navy.mil/library/online/v-22%20osprey.htm V-22 Osprey Tilt-Rotor Aircraft] , US Navy Historical Center, 7 January 2005.]

The V-22 was developed and is built jointly by Bell Helicopter, which manufactures and integrates the wing, nacelles, rotors, drive system, tail surfaces, and aft ramp, as well as integrates the Rolls-Royce engines, and Boeing Helicopters, which manufactures and integrates the fuselage, cockpit, avionics, and flight controls. Portions of the aircraft are manufactured in Philadelphia, Pennsylvania, Grand Prairie, Texas, and Fort Worth, Texas. Final assembly, flight testing, and delivery occurs in Amarillo, Texas. The joint development team is known as Bell Boeing. [ [http://www.boeing.com/rotorcraft/military/v22/ Boeing V-22 page] ] [ [http://www.bellhelicopter.com/en/aircraft/military/bellV-22.cfm Bell V-22 page] ]

The first of six MV-22 prototypes first flew on 19 March 1989 in the helicopter mode and on 14 September 1989 as a fixed-wing plane. The third and fourth prototypes successfully completed the Osprey's first Sea Trials on the USS "Wasp" in December 1990. However, the fourth and fifth prototypes crashed in 1990-91. Flight tests were resumed in August 1993 after changes were incorporated in the prototypes.

Flight testing of four full-scale development V-22s began in early 1997 when the first pre-production V-22 was delivered to the Naval Air Warfare Test Center in Patuxent River, MD. The first EMD Flight took place on 5 February 1997. The first of four low-rate initial production aircraft, ordered on 28 April 1997, was delivered on 27 May 1999. Osprey number 10 completed the program's second Sea Trials, this time from the USS "Saipan" in January 1999. During external load testing in April 1999, Boeing used a V-22 to lift and transport the M777 howitzer. [cite web|url=http://www.boeing.com/news/releases/1999/photorelease/photo_release_990503n2.htm|title=Boeing: V-22 Lifts 155 mm Howitzer|work=Boeing Integrated Defense Systems]

In 2000 there were two further fatal crashes, killing a total of 19 marines, and the production was again halted while the cause of these crashes was investigated and various parts were redesigned.cite news | first=Ron | last=Berler | coauthors= | title=Saving the Pentagon's Killer Chopper-Plane | date=July 2005 | publisher= | url =http://www.wired.com/wired/archive/13.07/osprey.html?pg=1&topic=osprey | work =Wired.com | pages = | accessdate = 2008-02-08 | language = ]

The V-22 completed its final operational evaluation in June 2005. [cite web|title=Pentagon Testing Office Concurs With Naval Testers, Supports MV-22 |publisher = Naval Air Systems Command|url=http://www.navair.navy.mil/V22/index.cfm?fuseaction=news.detail&id=130] The evaluation was deemed successful; events included long range deployments, high altitude, desert and shipboard operations. It was claimed that the problems identified in various accidents had been addressed by the V-22 program office.

On 28 September 2005, the Pentagon formally approved full-rate production for the V-22. The plan was to boost production from 11 a year to between 24 and 48 a year by 2012. Planned production quantities include 360 for the Marine Corps, 48 for the Navy, and 50 for the Air Force. The U.S. Army, originally the lead service for the then-named JVX program, is a possible candidate for use.

The V-22 had a flyaway cost of $70 million per aircraft in 2007, but the Navy hopes to shave about $10 million off that price after a five-year production contract starts in 2008. [ [http://www.navair.navy.mil/v22/index.cfm?fuseaction=news.detail&id=177 DJ US Navy Expects Foreign Interest In V-22 To Ramp Up Next Year] , Dow Jones Newswires, 31 May 2007.]

A total of 458 V-22s are expected to be built for the Marines, U.S. Air Force and U.S. Navy at an average unit cost of $110 million per aircraft.

Israel has shown interest in the purchase of an undisclosed number of MV-22s, but an order has not been placed or approved." [http://www.janes.com/defence/air_forces/news/jdw/jdw060125_1_n.shtml Israel considers V-22 acquisition ] ." Ben-David, A. "Jane's Defence Weekly". 25 January 2006.]

Controversy

The V-22's development process has been long and controversial. When the development budget, first projected at $2.5 billion in 1986, increased to $30 billion in 1988, then-Defense Secretary Dick Cheney tried to zero out its funding. He was eventually overruled by Congress. As of September 2007, the Osprey program spent $20 billion over 25 years of development, and will require another $35 billion from the Pentagon before the program is completed.

The V-22 squadron's former commander at Marine Corps Air Station New River, Lieutenant Colonel Odin Lieberman, was relieved of duty in 2001 after allegations that he instructed his unit that they needed to falsify maintenance records to make the plane appear more reliable.

The aircraft is incapable of autorotation in the case of engine failure, a fact that led a director of the Pentagon's testing office in 2005 to say that if the Osprey loses power while flying like a helicopter below 1,600 feet (490 m), emergency landings "are not likely to be survivable". But Captain Justin (Moon) McKinney, a V-22 pilot, says that this will not be a problem, "We can turn it into a plane and glide it down, just like a C-130". A complete loss of power would require the failure of both engines, as a drive shaft connects the nacelles through the wing; one engine can power both proprotors. [ [http://www.globalsecurity.org/military/systems/aircraft/v-22-propulsion.htm V-22 Osprey] , globalsecurity.org]

In 2000 Boeing announced that all V-22s were going to be fitted with a nose mounted GAU-19 Gatling gun, to provide "the V-22 with a strong defensive firepower capability to greatly increase the aircraft's survivability in hostile actions." [ [http://www.boeing.com/rotorcraft/military/v22/tilttimes/sep00.pdf Osprey Facts] , Bell-Boeing, 14 September 2000.] But the GAU-19 project was canceled, leading to criticism by retired Marine General James L. Jones, who is not satisfied with the current V-22 armament.

With the first combat deployment of the MV-22 in October 2007, Time Magazine ran an article condemning the aircraft as unsafe, overpriced, and completely inadequate. The Marine Corps, however, responded with the assertion that much of the article's data was dated, obsolete, inaccurate, and with expectations that ran too high for any new field of aircraft. [cite web|url=http://www.marinecorpstimes.com/news/2007/10/marine_osprey_071014/|title=Leaders, experts slam Time article on Osprey|work=Marine Corps Times, Oct 16, 2007]

Design

The Osprey is the world's first production tiltrotor aircraft, with one three-bladed proprotor, turboprop engine, and transmission nacelle mounted on each wingtip. For takeoff and landing, it typically operates as a helicopter with the nacelles vertical (rotors horizontal). Once airborne, the nacelles rotate forward 90° in as little as 12 seconds for horizontal flight, converting the V-22 to a more fuel-efficient, higher-speed turboprop airplane. STOL rolling-takeoff and landing capability is achieved by having the nacelles tilted forward up to 45°. For compact storage and transport, the V-22's wing rotates to align, front-to-back, with the fuselage. The proprotors can also fold in a sequence taking 90 seconds.cite web|url=http://www.fas.org/man/dod-101/sys/ac/docs/99-033.pdf|title=The CV-22 “Osprey” and the Impact on Air Force Combat Search and Rescue|publisher=Air Command and Staff College|author=Tom P. Currie Jr., Major, USAF|format=PDF]

The V-22 is equipped with a glass cockpit, which incorporates four Multi-Function Displays (MFDs) and one shared Central Display Unit (CDU), allowing the pilots to display a variety of images including: digimaps centered or decentered on current position, FLIR imagery, primary flight instruments, navigation (TACAN, VOR, ILS, GPS, INS), and system status. The flight director panel of the Cockpit Management System (CMS) allows for fully-coupled (aka: autopilot) functions which will take the aircraft from forward flight into a 50-foot hover with no pilot interaction other than programming the system. [citation |author = Daniel P Ringenbach, Scott Brick |contribution=Hardware-in-the-loop testing for development and integration of the V-22 autopilot system |title=AIAA Flight Simulation Technologies Conference Technical Papers (A95-39235 10-01) |location=Baltimore, MD |publisher=AIAA |booktitle=Technical Papers (A95-39235 10-01) |url=http://pdf.aiaa.org/preview/1995/PV1995_3385.pdf |format=pdf |accessdate=2008-08-03 |date=7 August 2005 |pages=28–36]

The V-22 is a fly-by-wire aircraft with triple-redundant flight control systems. With the nacelles pointing straight up in conversion mode at 90° the flight computers command the aircraft to fly like a helicopter, with cyclic forces being applied to a conventional swashplate at the rotor hub. With the nacelles in airplane mode (0°) the flaperons, rudder, and elevator fly the aircraft like an airplane. This is a gradual transition which occurs over the entire 96° range of the nacelles. The lower the nacelles, the greater effect of the airplane-mode control surfaces.

The Osprey is armed with one 0.308 in (7.62 mm) machine gun pointing rearward that can be fired when the loading ramp is lowered. A GAU-19 three-barrel 0.50 in (12.7 mm) gatling gun mounted below the V-22's nose has also been studied for future upgrade. [http://www.time.com/time/nation/article/0,8599,1665835-1,00.html "V-22 Osprey: A Flying Shame"] , Time magazine, 26 September 2007.] [ [http://www.dtic.mil/ndia/2002gun/depasqual.pdf Defensive Armament for the V-22 Selection, Integration, and Development] , Bell Helicopter and General Dynamics.] BAE Systems is also developing a remotely operated turreted weapons system for the V-22. [ [http://www.baesystems.com/Newsroom/NewsReleases/autoGen_10792205149.html "BAE Systems Launches New V-22 Defensive Weapon System, Begins On-The-Move Testing"] , BAE Systems, 2 October 2007.]

Operational history

Holloman AFB, NM, 2006.

USMC crew training on the Osprey has been conducted by VMMT-204 since March 2000. On 3 June 2005, the Marine Corps helicopter squadron HMM-263, stood down to begin the process of transitioning to the MV-22 Osprey. On 8 December 2005, Lieutenant General Amos, commander of the 2nd Marine Expeditionary Force, accepted the delivery of the first fleet of MV-22s, delivered to HMM-263. The unit reactivated on 3 March 2006 as the first MV-22 squadron and was redesignated VMM-263. On 31 August 2006, VMM-162 (the former HMM-162) followed suit. On 23 March 2007, Marine Medium Helicopter Squadron 266 became Marine Medium Tiltrotor Squadron 266 (VMM-266) at Marine Corps Air Station New River, North Carolina.

The Air Force's first operational CV-22 Osprey was delivered to the 58th Special Operations Wing (58th SOW) at Kirtland Air Force Base, New Mexico on 20 March 2006. This and subsequent aircraft will become part of the 58th SOW's fleet of aircraft used for training pilots and crewmembers for special operations use. [cite web|url=http://www.af.mil/news/story.asp?id=123017805|title=CV-22 delivered to Air Force|publisher=Air Force Print News|date=2006-03-21|accessdate=2008-08-03]

On 10 July 2007 an MV-22 Osprey landed aboard the Royal Navy aircraft carrier, HMS "Illustrious" in the Atlantic Ocean. This marked the first time an MV-22 had landed on any non-US vessel. [cite web| url=http://zerosix.wordpress.com/2007/07/12/tea-time-for-the-v22-mv22/ |title=1st Tea time for the V-22 (MV-22) |publisher=Zerosix world press|date=2007-07-12]

The Osprey entered operational service with the Marine Corps in 2007, in some cases replacing existing CH-46 Sea Knight squadrons. [cite web| url=http://ap.google.com/article/ALeqM5g1x8zPcP_xCUKx7oeCB3w_bGC3SAD8VG6JGG0| title=Miramar Base to Get Osprey Squadrons| publisher=Associated Press| date=2008-03-18| author=Carter, Chelsea J.] Dead link|date=August 2008 On 13 April 2007 the United States Marine Corps announced that it would be sending 10 V-22 aircraft to Iraq, the Osprey's first combat deployment. Marine Corps commandant, Gen. James Conway, indicated that over 150 Marines would accompany the Osprey set for September deployment to Al-Asad Airfield. [cite web|url=http://www.cnn.com/2007/US/04/13/osprey/index.html|title= Marines to deploy tilt-rotor aircraft to Iraq|author=Mike Mount|publisher=CNN.com|date=2007-04-14|accessdate=2007-04-19] [cite web|url=http://www.msnbc.msn.com/id/18098457/|title=Controversial Osprey aircraft heading to Iraq; Marines bullish on hybrid helicopter-plane despite past accidents|publisher=MSNBC|date=2007-04-13|accessdate=2008-08-03] On 17 September 2007, 10 MV-22Bs of VMM-263 left for Iraq aboard the USS "Wasp". The decision to use a ship rather than use the Osprey's self-deployment capability was made because of concerns over icing during the North Atlantic portion of the trip, lack of available KC-130s for mid-air refueling, and the availability of the USS "Wasp". [cite web|url=http://www.aviationtoday.com/rw/issue/features/16153.html|title=Military/Utility: Osprey Heads to Iraq|publisher=Rotor & Wing|date=2007-10-01]

The Osprey has provided support in Iraq, racking up some 2000 flight hours over three months with a mission capable availability rate of 68.1% as of late January 2008. [ [http://www.marines.mil/units/marforcom/iimef/2ndmardiv/Pages/JAN089.aspx "MV-22 ‘Osprey’ brings new capabilities to the sandbox"] , U.S. Marine Corps, 23 January 2008.] They are primarily used in Iraq's western Anbar province for routine cargo and troop movements, and also for riskier "aero-scout" missions. Gen. David Petraeus, the top U.S. military commander in Iraq, used one to fly around Iraq on Christmas Day, 2007, to visit troops.cite news | first=Mike | last=Mount | coauthors= | title=Maligned aircraft finds redemption in Iraq, military says | date=2008-02-08 | publisher=CNN.com | url =http://edition.cnn.com/2008/TECH/science/02/08/osprey/index.html | work = | pages = | accessdate = 2008-02-08 | language = ] Presidential candidate Barack Obama also flew in Ospreys during his high profile 2008 tour of Iraq.cite news | first=David | last=Hambling | coauthors= | title=Osprey's Excellent Photo Op | date=2008-07-31 | publisher= | url =http://blog.wired.com/defense/2008/07/httpwwwaviati-1.html | work = | pages = | accessdate = 2008-08-06 | language = ] The only major problem has been obtaining the necessary spare parts to maintain the aircraft.cite news | first=Graham | last=Warwick | coauthors= | title=US Marine Corps says V-22 Osprey performing well in Iraq | date=2008-02-07 | publisher= | url =http://www.flightglobal.com/articles/2008/02/07/221396/picture-us-marine-corps-says-v-22-osprey-performing-well-in-iraq.html | work =Flight magazine | pages = | accessdate = 2008-02-10 | language = ] Minor problems included the engines wearing quicker than desired, on four occasions V-22s at forward bases were grounded until repairs could be made to the oil cooling systems, and on one occasion a V-22 was forced to make an emergency landing due to engine damage. [ [http://startelegram.typepad.com/sky_talk/v22/ Sky News: Fort Worth Star-Telegram's Airline, Travel, and Aerospace Blog] ] Verify source|date=September 2008

Variants

;CV-22A : Air Force aircraft used as a transport from land bases. [ [http://www.dtic.mil/whs/directives/corres/pdf/412015l.pdf DoD 4120.15-L, Model Designation of Military Aerospace Vehicles] , U.S. Department of Defense, 12 May 2004.]

;MV-22B : Basic US Marine Corps transport; original requirement for 552 (now 360). The Marine Corps is the lead service in the development of the V-22 Osprey. The Marine Corps variant, the MV-22B, is an assault transport for troops, equipment and supplies, capable of operating from ships or from expeditionary airfields ashore. It is replacing the Marine Corps CH-46E and CH-53D. As of March 2007, the Marines have activated three operational Osprey squadrons. [US Marine Corps Press Release, 23 March 2007] [cite web|url=http://navy-matters.beedall.com/masc.htm|title=Maritime Airborne Surveillance and Control (MASC)|work=Navy Matters|accessdate=2008-08-03]

;CV-22B : Operated by the Air Force for the U.S. Special Operations Command (USSOCOM), will conduct long-range, special operations missions, and is equipped with extra fuel tanks. [ [http://216.230.103.132/resources/mv22osprey/mv22osprey.htm MV-22B Osprey tilt-rotor assault troop carrier] ] The Air Force officially accepted the CV-22 on 16 November 2006 in a ceremony conducted at Hurlburt Field in Northwest Florida. [cite web|url=http://www2.hurlburt.af.mil/news/story.asp?id=123032329|title=CV-22 arrival|work=Press Release from Hurlburt AFB|date=2006-11-20|accessdate=2008-08-03]

;HV-22B : The planned, but not-yet-funded, United States Navy HV-22 will provide combat search and rescue, delivery and retrieval of special warfare teams along with fleet logistic support transport. [cite web|url=http://www.globalsecurity.org/military/systems/aircraft/hv-22.htm|title=V-22 Osprey; HV-22 Navy Variant|accessdate=2008-08-03]

Operators

;USA
* United States Air Force
** 8th Special Operations Squadron (8 SOS) at Hurlburt Field, Florida
** 71st Special Operations Squadron (71 SOS) at Kirtland Air Force Base, New Mexico
* United States Marine Corps
** VMM-162
** VMM-261
** VMM-263
** VMM-266
** VMMT-204 - Training squadron
** VMX-22 - Marine Tiltrotor Operational Test and Evaluation Squadron

Notable accidents

From 1991 to 2000 there were four significant crashes during testing:

*On 11 June 1991, a mis-wired flight control system led to two minor injuries when the left nacelle struck the ground while the aircraft was hovering 15 feet in the air, causing it to bounce and catch fire.

*On 20 July 1992, a leaking gearbox led to a fire in the right nacelle, causing the aircraft to drop into the Potomac River in front of an audience of Congressmen and other government officials at Quantico, killing all seven on board and grounding the aircraft for 11 months.

*On 8 April 2000, a V-22 loaded with Marines to simulate a rescue, attempted to land at Marana Northwest Regional Airport in Arizona; its right rotor stalled at 245 feet, it rolled over, crashed, and exploded, killing all nineteen on board.

*On 11 December 2000, after a catastrophic hydraulic leak and subsequent instrument failure, a V-22 fell 1,600 feet into a forest in Jacksonville, North Carolina, killing all four aboard.

Since becoming operational in 2006, the V-22 has had seven other notable, but minor incidents.

pecifications (MV-22B)

aircraft specifications
plane or copter?=copter
jet or prop?=prop
ref=Boeing Integrated Defense Systems, [cite web|url=http://www.boeing.com/rotorcraft/military/v22/v22spec.htm|title=V-22 Osprey Technical Specifications|work=Boeing Integrated Defense Systems] " "Naval Air Systems Command,cite web|url=http://www.navair.navy.mil/v22/?fuseaction=aircraft.main|title=V-22 Characteristics|work=Naval Air Systems Command] "and the "CV-22 Air Force Fact Sheet. [cite web|url=http://www.af.mil/factsheets/factsheet.asp?id=3668|title=CV-22 OSPREY|publisher=Air Force Link|accessdate=2008-08-03]
crew=two pilots
capacity=24 troops (seated), 32 troops (floor loaded) or up to 15,000 pounds of cargo
length main=57 ft 4 in
length alt=17.5 m
span main=38 ft 0 in
span alt=11.6 m)
*Wingspan: 46 ft (14 m); 84 ft 7 in (including rotors)
height main= 22 ft 1 in (overall - nacelles vertical)
height alt= 17 ft 11 in 5.5 m (at top of tailfins)
area main=2,268 ft²
area alt=212 m²)
*Wing area: 301.4 ft² (28 m²
empty weight main=33,140 lb
empty weight alt=15,032 kg
loaded weight main=47,500 lb
loaded weight alt=21,500 kg
max takeoff weight main=60,500 lb
max takeoff weight alt=27,400 kg
more general=
engine (prop)=Rolls-Royce Allison Rolls-Royce T406 (AE 1107C-Liberty)
type of prop=turboshafts
number of props=2
power main=6,150 hp
power alt=4,590 kW
max speed main= 275 knots
max speed alt= 316 mph, 509 km/h
cruise speed main= 214 knots
cruise speed alt= 246 mph, 396 km/h
cruise speed more= at sea level
range main=879 nmi
range alt=1,011 mi, 1,627 km
range more=(unrefueled)
combat radius main= 370 nmi
combat radius alt= 430 mi, 690 km
ferry range main=2,417 nm
ferry range alt=2,781 mi, 4,476 km
ceiling main=26,000 ft
ceiling alt=7,925 m
climb rate main=2,320 ft/min
climb rate alt=11.8 m/s
loading main=20.9 lb/ft² @ 47,500 lb GW
loading alt=102.23 kg/m²
power/mass main=0.259 hp/lb
power/mass alt=427 W/kg
more performance=

Popular Culture

Two CV-22s (of only three in the USAF inventory at the time [ [http://www.af.mil/news/story_media.asp?id=123021212 Ospreys in flight] , US Air Force] ) were filmed in flight at Holloman Air Force Base, New Mexico, in May 2006 for the 2007 "Transformers" film. [ [http://www.af.mil/news/story.asp?id=123021221 "Movie project transforms Holloman"] , US Air Force, 5 June 2006.] [ [http://www.af.mil/news/story.asp?id=123059424 "'Transformers' put Airmen, aircraft on big screen"] , US Air Force, 3 July 2007.]

V-22s, particularly MV-22s play prominent roles in several novels by Dale Brown, most particularly, "Hammerheads" which features an MV-22 on the cover.Fact|date=June 2008

ee also

aircontent
related=
* Bell XV-15
* Bell/Agusta BA609
* Bell Boeing Quad TiltRotor
similar aircraft=
* Canadair CL-84
* LTV XC-142
lists=
* List of military aircraft of the United States
* List of VTOL aircraft
see also=
* Powered lift

References

* Norton, Bill. "Bell Boeing V-22 Osprey, Tiltrotor Tactical Transport". Midland Publishing, 2004. ISBN 1-85780-165-2.

External links

* [http://www.boeing.com/rotorcraft/military/v22/ Official Boeing V-22 site]
* [http://www.bellhelicopter.com/en/aircraft/military/bellV-22.cfm Official Bell V-22 site]
* [http://www.navair.navy.mil/V22/index.cfm V-22 Osprey web] , [http://www.history.navy.mil/planes/v-22.html V-22 Osprey history] and [http://www.history.navy.mil/library/online/v-22%20osprey.htm V-22 Osprey CRS report on Navy.mil]
* [http://www.af.mil/factsheets/factsheet.asp?fsID=3668 CV-22 fact sheet on USAF site]
* [http://www.globalsecurity.org/military/systems/aircraft/v-22.htm V-22 page on GlobalSecurity.org]
* [http://www.signonsandiego.com/news/military/20050715-1648-cnsosprey.html After decades of tragedy, Osprey may be ready for combat] , Otto Kreisher, San Diego Tribune, 15 July 2005
* [http://www.alexisparkinn.com/photogallery/Videos/Airplane%20-Helicopter%20V22.avi A video footage of the 1991 Osprey crash with commentary]
* [http://www.military.com/NewContent/0,13190,NI_Myth_0904,00.html Dispelling the Myths of the MV-22]
* [http://www.defensetech.org/archives/001837.html Osprey OK'd]
* [http://www.findarticles.com/p/articles/mi_qa3834/is_200301/ai_n9310738 Onward and Upward]
* [http://www.navair.navy.mil/v22/index.cfm?fuseaction=gallery.downloadVideo&id=11 "Flight of the Osprey"] , US Navy video of V-22 operations
*
* [http://www.fas.org/sgp/crs/weapons/RL31384.pdf Congressional Research Service Summary of V-22 Pros and Cons]
* [http://www.texasobserver.org/article.php?aid=1679 Review of political forces that helped shape V-22 program]
*
* [http://www.cnn.com/2006/BUSINESS/07/18/farnborough.boulden.osprey/index.html The Osprey finally soars] , CNN, 18 July 2006
* [http://www.dhadm.com/index.php/dhadm/v_22_osprey_on_futureweapons/ The Osprey On Future Weapons – Feb 2007]
*, US Marine Corp. Press Release, 23 March 2007
* [http://www.flightglobal.com/articles/2007/10/25/218911/israel-confirms-interest-in-bell-boeing-v-22-tiltrotor.html "Israel confirms interest in Bell Boeing V-22 tiltrotor"] , Flight International, 25 October 2007.