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	Tiltrotor - Wikipedia, the free encyclopedia
		A tiltrotor aircraft combines the vertical lift capability of a helicopter with the speed of a turboprop aeroplane.
		Additionally, the tiltrotor propulsion system is more complex than a conventional helicopter due to the large, articulated nacelles and the added wing; however, the improved cruise efficiency and speed improvement over helicopters is significant in certain uses.
		Tiltrotors, however, are typically as loud as equally sized helicopters in hovering flight.
	en.wikipedia.org /wiki/Tiltrotor (889 words)

	Tiltrotor (Site not responding. Last check: 2007-09-19)
		However with the tiltrotor this problem is avoided, because the rotors are perpendicular to the motion in the high-speed portions of the flight regime.
		This means the tiltrotor has relatively high maximum speed, up to 300 knots (560 km/h) has been demonstrated in the two types of tilt rotors flown so far.
		Tiltrotors have a greater number of expensive components and structure than airplanes and helicopters.
	www.yotor.com /wiki/en/ti/Tiltrotor.htm (1193 words)

	BA609 Civil Tiltrotor (Site not responding. Last check: 2007-09-19)
		The Bell/Agusta 609 is a six to nine passenger transport aircraft that combines the speed and range of a turboprop airplane with the vertical takeoff and landing capability of a helicopter.
		The BA609 is the first step toward the development of a family of civil tiltrotors, and a revolution in commercial aviation that will change the way the world flies, unlocking enormous technological promise and commercial potential.
		Tiltrotors are conventional aircraft with tilting wing-mounted engine nacelles that combine the hover characteristics of helicopters - with the range and speed of fixed-wing transports.
	www.worldnewsstand.net /03/SR/3-3.htm (348 words)

	BellTiltrotors
		The BA 609 tiltrotor is expected to cruise at 275 kt with a range of 750 nm.
		The T-609 Tiltrotor Trainer is aimed at reducing the fleet training costs, student time in the training pipeline and the risks associated with conducting initial tiltrotor training in the V-22 Osprey.
		The UC-609 Utility Tiltrotor is also offered for other missions where the vertical take-off and landing capability of the helicopter needs to be combined with the high speed, forward flight ability of a fixed-wing aircraft.
	www.vtol.org /vertiflite/BellTiltrotors.htm (2183 words)

	Civil Tiltrotor Group (Site not responding. Last check: 2007-09-19)
		Tiltrotor aircraft, combining the good hover performance and control of a helicopter with the cruise speed and efficiency of a turboprop airplane are entering serial production for military and civil uses.
		As shown, tiltrotor aircraft feature wing tip mounted proprotors that can be rotated from a vertical orientation for take-off and landing to a horizontal position for efficient fixed-wing-borne flight for high speed cruise.
		Tiltrotor aircraft represent the first major new aircraft type to enter production since the supersonic transports of the 1970's.
	caffeine.arc.nasa.gov /CTG (660 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-09-19)
		The tiltrotor aircraft according to claim 1, wherein the nacelle control system comprises: a thumbwheel electrically coupled to the power lever and the at least one flight control computer; wherein rotational movement of the thumbwheel causes the pre-selected rotational movement of the tiltrotor assembly.
		The tiltrotor aircraft according to claim 2, wherein the thumbwheel comprises: a first detent position into which the thumbwheel is spring biased; a second detent position; a third detent position; and a fourth detent position; wherein the tiltrotor assembly rotates in a forward direction when the thumbwheel is rotated into the second detent position;
		The tiltrotor aircraft according to claim 1, wherein the at least one flight control computer is programmed to prevent the tiltrotor assembly from rotating into a position outside a selected operating envelope as determined by the operating conditions of the tiltrotor aircraft.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/87706.011122&ELEMENT_SET=DECL (4989 words)

	FAA Office of Communications, Navigation, and Surveillance Systems (AND-1) (Site not responding. Last check: 2007-09-19)
		Helicopters and tiltrotors may be used to transport Government representatives to inspect the disaster area, to assess the extent of damage, and to show their sympathy and concern for victims and survivors.
		A key to the rapid and efficient deployment of helicopter and tiltrotor aircraft to support relief or rescue efforts is a list of commercial, private, government, and military operators who have agreed to commit aircraft.
		All helicopter and tiltrotor landing areas should be free of dust, loose dirt, other forms of loose debris and objects, and gravel smaller than one and one half inches in diameter.
	www.faa.gov /and/and1/AC0059/ACNo0059.cfm (15004 words)

	XV-15
		The XV-15, a NASA-inspired, Bell Helicopter-produced experimental tiltrotor aircraft, is the precursor to the V-22 Osprey.
		The development of the XV-15 Tiltrotor research aircraft was initiated in 1973 with joint Army/NASA funding as a "proof of concept", or "technology demonstrator" program, with two aircraft being built by Bell Helicopter Textron (BHT) in 1977.
		To accomplish the research objectives, powered semi-span and full-span Tiltrotor models and advanced computational fluid dynamic CFD analyses were also used to develop an understanding of the hover flowfield, aerodynamic interactions, acoustics, advanced tip effects, and groundwash characteristics.
	www.globalsecurity.org /military/systems/aircraft/xv-15.htm (544 words)

	Tiltrotor Trim (Site not responding. Last check: 2007-09-19)
		The problem has so far not affected most of the trim analysis except the tiltrotor where the wing pitch attitude is a dominant trim variable at high flight speed.
		The hub parent forces (`rotorhead_hub_pfo'), instead of the children, are used for the trim hub load outputs.
		This won't be a problem when the `hub_U(2)' (a control chinge is used for the model) is not changed in the analysis, But it causes error if the `hub_u(2)' is varying such as in the case of tiltrotor analysis.
	www.flightlab.com /~he/flabqna/analysis/tiltrtr-bug.html (188 words)

	The Center for Security Policy (Site not responding. Last check: 2007-09-19)
		In attendance at the Roundtable, entitled "Tiltrotor Technology and 'Joint Vision 2010': A New Way to Fly and to Fight," were more than seventy current and former policy-makers in the legislative and executive branches, members of the armed services, representatives of industry and the media.
		The tiltrotor was consistently identified as a uniquely powerful contributor to technology leverage because it "leaps ahead" of current helicopter Vertical Take-Off and Landing (VTOL) technology.
		Smaller variants of the tiltrotor were identified as attractive candidates for gunship, coastal rescue and training missions.
	www.centerforsecuritypolicy.org /index.jsp?section=papers&code=97-P_65at (2348 words)

	XV-15 Tiltrotor Research Aircraft, 20th Anniversary (Site not responding. Last check: 2007-09-19)
		Tiltrotors achieve this by the use of rotors that operate like helicopter rotors during takeoff and landing, then tilt to horizontal thrust to act like turboprop propellers during cruise.
		The military V-22 Osprey tiltrotor, on which this study was based, is the result of more than 30 years of tiltrotor development, starting with the Bell XV-3.
		The development of the XV-15 tiltrotor research aircraft was initiated in 1973 with joint Army/ NASA funding as a "proof of concept", or "technology demonstrator" program, with two aircraft being built by Bell Helicopter Textron (BHT).
	www.simlabs.arc.nasa.gov /library/tiltrotor/ctr20th.html (1316 words)

	News: Bell / Agusta 609 Tiltrotor
		The BA 609 is a versatile tiltrotor aircraft providing operators greatly improved performance with twice the speed and range of conventional helicopters.
		With its rotors in the vertical position, the tiltrotor is able to take-off, land and hover like a traditional helicopter.
		With the rotors in the horizontal position, the tiltrotor is able to fly with the high speed and range of a turboprop fixed wing airplane.
	www.helis.com /news/1999/ba609.htm (375 words)

	TRAM Home Page (Site not responding. Last check: 2007-09-19)
		Tiltrotor aircraft are unique and valuable because they can takeoff and land like a helicopter, but fly fast like an airplane.
		In their report to Congress, the committee concluded that the civil tiltrotor concept is technically feasible, a market exists, and the civil tiltrotor has the potential of relieving congestion at major airports.
		This tiltrotor performance data set will be unique because it will be acquired at a higher accuracy, with more comprehensive and complementary measurements, and steadier test conditions than in previous tiltrotor tests.
	halfdome.arc.nasa.gov /research/tram2.html (1756 words)

	Aerospace Technology - Bell Agusta BA609 Tiltrotor VTOL Aircraft, USA
		The BA609 tiltrotor aircraft is being developed by Bell Agusta Aerospace Company, a joint venture of Bell Helicopter Textron, Inc. and AgustaWestland, jointly owned by Finmecannica of Italy and GKN of the UK.
		The tiltrotor combines the speed, comfort and ability to fly at altitude above the weather of a turboprop with the convenience of the vertical take-off and landing (VTOL) abilities of a helicopter.
		With the nacelles in the horizontal position, the tiltrotor is able to fly with the high speed and range of a turboprop fixed wing aeroplane.
	www.aerospace-technology.com /projects/ba609 (791 words)

	Civil Tiltrotor for the Commuter (Site not responding. Last check: 2007-09-19)
		Key to tiltrotor's success is its VTOL ability, perceived as a necessity at one or both ends of each trip.
		For the public at large, the tiltrotor offers improved service in terms of flexibility and speed while at the same time reducing the sound levels and possibly the number of aircraft needed to do the same work.
		Tiltrotors large enough to allow economies of scale -- in operation and in cost to build -- are developed.
	www.simlabs.arc.nasa.gov /library/tiltrotor/commuter.html (1774 words)

	Tiltrotor (Site not responding. Last check: 2007-09-19)
		A tiltrotor aircraft combines the maneuverability of a helicopter with the speed and efficiency of a turboprop aeroplane.
		This means the tiltrotor has no built-in maximum speed, and in fact is simply much faster in practical terms too.
		The longer range means that tiltrotors can directly increase the security of a carrier operating group or forward air base, by allowing the airbase to be located further from the front lines.
	www.city-search.org /ti/tiltrotor.html (864 words)

	GNC Article (Site not responding. Last check: 2007-09-19)
		This assumption is not valid for a tiltrotor with its ability to convert from cruise configuration at high altitudes to helicopter operation in steep approaches at sea level.
		The tiltrotor provides a unique challenge since its control responses change as it converts from forward flight in aircraft configuration to slow flight as helicopter.
		A tiltrotor aircraft is a prominent candidate for augmentation of the longitudinal channel.
	controls.ae.gatech.edu /anncontrol/article (3194 words)

	Business Wire: Bell Helicopter Textron to Assume Full Ownership of Civil Tiltrotor Program
		"Tiltrotor technology, with its combination of speed, range and dexterity, is proving to be a very attractive transportation solution for corporate travel, natural resource exploration, emergency medical evacuation and disaster relief," said Stinson.
		It was a natural step in a partnership that began in 1982 when the companies combined their complementary capabilities and resources to develop the V-22 Osprey tiltrotor aircraft for the U.S. Marine Corps and Air Force Special Operations Command.
		Tiltrotor aircraft are able to take off, hover and land vertically like a helicopter.
	www.findarticles.com /p/articles/mi_m0EIN/is_1998_Feb_12/ai_20234617 (385 words)

	News: World's first commercial Tiltrotor training academy
		The BA 609 is a versatile aircraft with twice the speed and range of conventional helicopters.
		With its outboard nacelles in the vertical position, the tiltrotor is able to take-off land and hover like a traditional helicopter.
		With the nacelles in the horizontal position, the tiltrotor is able to fly with the high speed and range of a turboprop fixed wing airplane.
	www.helis.com /news/2000/v22acad.htm (570 words)

	Tiltrotor Design for Performance Optimization
		Tiltrotor Optimizer provides a detailed and precise design of the propeller or rotor by optimizing both chord and pitch distributions using minimum induced loss design.
		Tiltrotor Optimizer models your aircraft and computes its performance to match propeller or rotor design directly providing more accurate performance improvements.
		Since Tiltrotor Optimizer is also an airplane performance program, this approach gives the best prop design for the desired performance objective.
	webpages.charter.net /bateseng/tiltrotr.htm (697 words)

	Bell Helicopter Textron to Build Tiltrotor UAV (Site not responding. Last check: 2007-09-19)
		Tiltrotor UAV to be designed and built in one year - November 2003
		In contrast, the Bell tiltrotor can take off and land vertically like a helicopter, from small ships or rough terrain unsuitable for landing strips, yet can achieve fast, long-distance flight with the rotors in the horizontal position.
		Top speed with rotors in the horizontal position is 200 knots/230 mph, but in hover mode, the craft has the ability to loiter over a target for as long as four hours.
	www.compositesworld.com /hpc/issues/2003/November/267 (330 words)

	Bell Helicopter Press Release - Jul 19, 2004 (Site not responding. Last check: 2007-09-19)
		As a tiltrotor, the V-22 Osprey combines turboprop airplane and vertical lift technologies into one efficient, extremely capable aircraft.
		Although the initial Ospreys will be delivered to the Marines for their use in amphibious operations that support the "Forward...From the Sea" doctrine and AFSOC for long-range insertion and extraction of special teams, the aircraft's baseline design will allow it to meet joint service requirements well into the next century.
		Tiltrotor technology is considered "dual-use" technology since it has capabilities that can contribute significantly to both military and civil applications.
	www.bellhelicopter.textron.com /en/companyInfo/pressReleases/pr_farnb_bellboeing_01.cfm (653 words)

	HV-609 / BA609 Tiltrotor
		Many in the Coast Guard think the BA609 tiltrotor might be the service’s most cost-effective air platform—because it combines in one aircraft hover capability and fixed-wing speed.
		The BA609 Tiltrotor combines the speed, altitude and comfort of a turboprop with the vertical takeoff and landing capabilities of a helicopter.
		When the nacelles are tilted forward to the horizontal position, the aircraft is able to fly with the high speed and range of a turboprop fixed wing airplane.
	www.globalsecurity.org /military/systems/aircraft/hv-609.htm (537 words)

	AWST STORY
		HROD-related VRS has become a battleground for detractors and supporters of the V-22, with critics charging the flight instability makes the aircraft inherently unsafe and advocates countering that the tiltrotor is less susceptible to the condition than regular helicopters and that control can be regained simply by moving the nacelles forward.
		There are still technical hurdles to clear, such as demonstrating the tiltrotor's deicing capability, he noted.
		Flying the aircraft in those conditions is "risky" because it involves extremely high rates of descent that lie far outside the aircraft's performance envelope, he said.
	www.aviationnow.com /avnow/news/channel_awst_story.jsp?id=news/05263news.xml (1184 words)

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