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A vertical take-off and landing (VTOL) aircraft is one that can hover, take off, and land vertically. This classification can include a variety of types of aircraft including fixed-wing aircraft as well as helicopters and other aircraft with powered rotors, such as cyclogyros/cyclocopters and tiltrotors.[1] Some VTOL
VTOL
aircraft can operate in other modes as well, such as CTOL (conventional take-off and landing), STOL
STOL
(short take-off and landing), and/or STOVL
STOVL
(short take-off and vertical landing). Others, such as some helicopters, can only operate by VTOL, due to the aircraft lacking landing gear that can handle horizontal motion. VTOL
VTOL
is a subset of V/ STOL
STOL
(vertical and/or short take-off and landing). Besides the ubiquitous helicopter, there are currently two types of VTOL
VTOL
aircraft in military service: craft using a tiltrotor, such as the Bell Boeing V-22 Osprey, and another using directed jet thrust, such as the Harrier family and new F-35B Lightning II Joint strike Fighter (JSF). In the civilian sector currently only helicopters are in general use (some other types of commercial VTOL
VTOL
aircraft have been proposed and are under development as of 2017[update]). Generally speaking, VTOL
VTOL
aircraft capable of STOVL
STOVL
use it wherever possible, since it typically significantly increases takeoff weight, range or payload compared to pure VTOL.[2]

Contents

1 History

1.1 Props, proprotors and advanced rotorcraft 1.2 Jet lift 1.3 V/STOL 1.4 Modern drones 1.5 Rockets

2 Rotorcraft

2.1 Helicopter 2.2 Autogyro 2.3 Gyrodyne 2.4 Cyclogyro

3 Powered lift

3.1 Convertiplane

3.1.1 Tiltrotor 3.1.2 Tiltjet 3.1.3 Tiltwing

3.2 Tail-sitter 3.3 Vectored thrust 3.4 Lift jets 3.5 Lift fans 3.6 Lift via Coandă effect

4 Gallery 5 See also 6 References

6.1 Notes 6.2 Bibliography

7 External links

History[edit] Props, proprotors and advanced rotorcraft[edit] See also: Helicopter
Helicopter
§ History, and Tiltrotor
Tiltrotor
§ History The idea of vertical flight has been around for thousands of years and sketches for a VTOL
VTOL
(helicopter) shows up in Leonardo da Vinci's sketch book. Manned VTOL
VTOL
aircraft, in the form of primitive helicopters, first flew in 1907 but would take until after World War Two to perfect.[3][4] In addition to helicopter development, many approaches have been tried to develop practical aircraft with vertical take-off and landing capabilities including Henry Berliner's 1922–1925 experimental horizontal rotor fixed wing aircraft, and Nikola Tesla's 1928 patent and George Lehberger's 1930 patent for relatively impractical VTOL fixed wing airplanes with a tilting engines.[5][6][7] In the late 1930s British aircraft designer Leslie Everett Baynes was issued a patent for the Baynes Heliplane, another tilt rotor aircraft. In 1941 German designer Heinrich Focke's began work on the Focke-Achgelis Fa 269, which had two rotors that tilted downward for vertical takeoff, but wartime bombing halted development.[7]

Convair
Convair
XFY-1 Pogo in flight

In May 1951, both Lockheed and Convair
Convair
were awarded contracts in the attempt to design, construct, and test two experimental VTOL
VTOL
fighters. Lockheed produced the XFV, and Convair
Convair
producing the Convair
Convair
XFY Pogo. Both experimental programs proceeded to flight status and completed test flights 1954–1955, when the contracts were cancelled.[8] Similarly, the X-13 flew a series of test flights between 1955 and 1957, but also suffered the same fate.[9] The use of vertical fans driven by engines was investigated in the 1950s. The US built an aircraft where the jet exhaust drove the fans, while British projects not built included fans driven by mechanical drives from the jet engines.[citation needed]

Bell XV-15

NASA
NASA
has flown other VTOL
VTOL
craft such as the Bell XV-15
Bell XV-15
research craft (1977), as have the Soviet Navy
Soviet Navy
and Luftwaffe. Sikorsky tested an aircraft dubbed the X-Wing, which took off in the manner of a helicopter. The rotors would become stationary in mid-flight, and function as wings, providing lift in addition to the static wings. Boeing X-50 is a Canard Rotor/Wing
Canard Rotor/Wing
prototype that utilizes a similar concept.[10]

Fairey Jet Gyrodyne

A different British VTOL
VTOL
project was the gyrodyne, where a rotor is powered during take-off and landing but which then freewheels during flight, with separate propulsion engines providing forward thrust. Starting with the Fairey Gyrodyne, this type of aircraft later evolved into the much larger twin-engined Fairey Rotodyne, that used tipjets to power the rotor on take-off and landing but which then used two Napier Eland
Napier Eland
turboprops driving conventional propellers mounted on substantial wings to provide propulsion, the wings serving to unload the rotor during horizontal flight. The Rotodyne was developed to combine the efficiency of a fixed-wing aircraft at cruise with the VTOL
VTOL
capability of a helicopter to provide short haul airliner service from city centres to airports.

U.S. Marines jump from a V-22 Osprey, the first production tiltrotor aircraft

CL-84-1 (CX8402) on display at the Canada Aviation and Space Museum
Canada Aviation and Space Museum
in Ottawa, Ontario

The CL-84 was a Canadian V/ STOL
STOL
turbine tilt-wing monoplane designed and manufactured by Canadair
Canadair
between 1964 and 1972. The Canadian government ordered three updated CL-84s for military evaluation in 1968, designated the CL-84-1. From 1972 to 1974, this version was demonstrated and evaluated in the United States aboard the aircraft carriers USS Guam and USS Guadalcanal, and at various other centres.[citation needed] These trials involved military pilots from the United States, the United Kingdom and Canada. During testing, two of the CL-84s crashed due to mechanical failures, but no loss of life occurred as a result of these accidents. No production contracts resulted.[11] Although tiltrotors such as the Focke-Achgelis Fa 269
Focke-Achgelis Fa 269
of the mid-1940s and the Centro Técnico Aeroespacial "Convertiplano" of the 1950s reached testing or mock-up stages, the V-22 Osprey
V-22 Osprey
is considered the world's first production tiltrotor aircraft. It has one three-bladed proprotor, turboprop engine, and transmission nacelle mounted on each wingtip. The Osprey is a multi-mission aircraft with both a vertical takeoff and landing (VTOL) and short takeoff and landing capability (STOL). It is designed to perform missions like a conventional helicopter with the long-range, high-speed cruise performance of a turboprop aircraft. The FAA classifies the Osprey as a model of powered lift aircraft.[12] Attempts were made in the 1960s to develop a commercial passenger aircraft with VTOL
VTOL
capability. The Hawker Siddeley
Hawker Siddeley
Inter-City Vertical-Lift proposal had two rows of lifting fans on either side. However, none of these aircraft made it to production after they were dismissed as too heavy and expensive to operate.[13][14] Jet lift[edit]

The Ryan X-13

In 1947, Ryan X-13 Vertijet, a tailsitter design, was ordered by the US Navy, who then further issued a proposal in 1948 for an aircraft capable of vertical takeoff and landing (VTOL) aboard platforms mounted on the afterdecks of conventional ships. Both Convair
Convair
and Lockheed competed for the contract but in 1950, the requirement was revised, with a call for a research aircraft capable of eventually evolving into a VTOL
VTOL
ship-based convoy escort fighter.

"Flying Bedstead"- Rolls-Royce Thrust Measuring Rig

Another more influential early functional contribution to VTOL
VTOL
was Rolls-Royce's Thrust Measuring Rig ("flying bedstead") of 1953. This led to the first VTOL
VTOL
engines as used in the first British VTOL aircraft, the Short SC.1 (1957), Short Brothers and Harland, Belfast which used four vertical lift engines with a horizontal one for forward thrust.

The Short SC.1 a VTOL
VTOL
delta aircraft

The Short SC.1 was the first British fixed-wing VTOL
VTOL
aircraft. The SC.1 was designed to study the problems with VTOL
VTOL
flight and the transition to and from forward flight. The SC.1 was designed to meet a Ministry of Supply (MoS) request for tender (ER.143T) for a vertical take-off research aircraft issued in September 1953. The design was accepted by the ministry and a contract was placed for two aircraft (XG900 and XG905) to meet Specification ER.143D dated 15 October 1954. The SC.1 was also equipped with the first "fly-by-wire" control system for a VTOL
VTOL
aircraft. This permitted three modes of control of the aerodynamic surfaces and/or the nozzle controls.

The Soviet Union's VTOL
VTOL
aircraft, the Yakovlev
Yakovlev
Yak-38

The Yakovlev Yak-38
Yakovlev Yak-38
was a Soviet Navy
Soviet Navy
VTOL
VTOL
aircraft intended for use aboard their light carriers, cargoships, and capital ships. It was developed from the Yakovlev Yak-36
Yakovlev Yak-36
experimental aircraft in the 1970s. Before the Soviet Union
Soviet Union
broke up, a supersonic VTOL
VTOL
aircraft was developed as the Yak-38's successor, the Yak-141, which never went into production.[15]

A German V/ STOL
STOL
VJ101 on display at the Deutsches Museum, Munich, Germany

Do 31 E3 on display at the Deutsches Museum, Germany

In the 1960s and early 1970s, Germany planned three different VTOL aircraft. One used the Lockheed F-104 Starfighter
Lockheed F-104 Starfighter
as a basis for research for a V/ STOL
STOL
aircraft. Although two models (X1 and X2) were built, the project was canceled due to high costs and political problems as well as changed needs in the German Air Force
German Air Force
and NATO. The EWR VJ 101C did perform free VTOL
VTOL
take-offs and landings, as well as test flights beyond mach 1 in the mid- and late 60s. One of the test-aircraft is preserved in the Deutsches Museum
Deutsches Museum
in Munich, Germany. The others were the VFW-Fokker VAK 191B light fighter and reconnaissance aircraft, and the Dornier Do 31E-3 (troop) transport.[16] The LLRV
LLRV
was a spacecraft simulator for the Apollo lunar lander.[17] It was designed to mimic the flight characteristics of the lunar module (LEM), which had to rely on a reaction engine to land on the Moon. The idea of using the same engine for vertical and horizontal flight by altering the path of the thrust led to the Bristol Siddeley Pegasus engine which used four rotating nozzles to direct thrust over a range of angles.[18] This was developed side by side with an airframe, the Hawker P.1127, which became subsequently the Kestrel and then entered production as the Hawker Siddeley
Hawker Siddeley
Harrier, though the supersonic Hawker Siddeley
Hawker Siddeley
P.1154 was canceled in 1965. The French in competition with the P.1154 had developed a version of the Dassault Mirage III capable of attaining Mach 1. The Dassault Mirage IIIV
Dassault Mirage IIIV
achieved transition from vertical to horizontal flight in March 1966, reaching Mach 1.3 in level flight a short time later. V/STOL[edit] The Harrier is usually flown in STOVL
STOVL
mode, which enables it to carry a higher fuel or weapon load over a given distance.[2] In V/ STOL
STOL
the VTOL
VTOL
aircraft moves horizontally along the runway before taking off using vertical thrust. This gives aerodynamic lift as well as thrust lift and permits taking off with heavier loads and is more efficient. When landing the aircraft is much lighter due to the loss of propellant weight and a controlled vertical landing is possible. Now retired from British Royal Navy
Royal Navy
service, the Indian Navy
Indian Navy
operates Sea Harriers mainly from its aircraft carrier INS Viraat. The latest version of the Harrier, the BAE Harrier II
BAE Harrier II
has also been retired in December 2010, after being operated by the British Royal Air Force
Royal Air Force
and Royal Navy. The United States Marine Corps, and the Italian and Spanish Navies use the AV-8B Harrier II, an equivalent derivative of the Harrier II. The Harrier II/AV-8 will be replaced in the air arms of the US and UK by a STOVL
STOVL
variant of the Lockheed Martin F-35 Lightning II. An important aspect of Harrier STOL
STOL
operations aboard Naval carriers was the "ski jump" raised forward deck, which gave the craft additional vertical momentum at takeoff. Modern drones[edit]

A Schiebel Camcopter S-100, a modern VTOL
VTOL
unmanned aerial vehicle

In the 21st century, unmanned drones are becoming increasingly commonplace. Many of these have VTOL
VTOL
capability, especially the quadcopter type. Others, such as the Schiebel Camcopter S-100
Schiebel Camcopter S-100
are more conventional. Rockets[edit] Grasshopper was a VTVL
VTVL
first-stage booster test vehicle SpaceX developed to validate various low-altitude, low-velocity engineering aspects of its large-vehicle reusable rocket technology.[19] The test vehicle made eight successful test[20] flights in 2012–2013. Grasshopper v1.0 made its eighth, and final, test flight on October 7, 2013, flying to an altitude of 744 metres (2,441 ft) (0.46 miles) before making its eighth successful VTVL
VTVL
landing.[21] On November 23, 2015, Blue Origin's New Shepard booster rocket made the first successful vertical landing following an unmanned suborbital test flight that reached space.[22] On December 21, 2015, SpaceX's 20th Falcon 9
Falcon 9
first stage made a successful landing after boosting 11 commercial satellites to low earth orbit on Falcon 9
Falcon 9
Flight 20.[23] These demonstrations potentially open the way for substantial reductions in space flight costs.[24] Rotorcraft[edit] Helicopter[edit] Main article: Helicopter The helicopter's form of VTOL
VTOL
allows it to take off and land vertically, to hover, and to fly forwards, backwards, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft would usually not be able to take off or land. The capability to efficiently hover for extended periods of time is due to the helicopter's relatively long, and hence efficient rotor blades, and allows a helicopter to accomplish tasks that fixed-wing aircraft and other forms of vertical takeoff and landing aircraft could not perform at least as well until 2011. On the other hand, the long rotor blades restrict the maximum speed to about 250 miles per hour (400 km/h) of at least conventional helicopters, as retreating blade stall causes lateral instability. Autogyro[edit] Main article: Autogyro Autogyros are also known as gyroplanes or gyrocopters. The rotor is unpowered and rotates freely in the airflow as the craft travels forward, so the craft needs a conventional powerplant to provide thrust. An autogyro is not intrinsically capable of VTOL: for VTO the rotor must be spun up to speed by an auxiliary drive, and vertical landing requires precise control of rotor momentum and pitch. Gyrodyne[edit] Main article: Gyrodyne Gyrodynes are also known as compound helicopters or compound gyroplanes. A gyrodyne has the powered rotor of a helicopter with a separate forward thrust system of an autogyro. Apart from take-off and landing the rotor may be unpowered and autorotate. Designs may also include stub wings for added lift. Cyclogyro[edit] Main article: Cyclogyro A cyclogyro or cyclocopter has a rotary wing whose axis and surfaces remain sideways across the airflow, as with a conventional wing. Powered lift[edit] Main article: Powered lift Convertiplane[edit] Main article: Convertiplane A convertiplane takes off under rotor lift like a helicopter, then transitions to fixed-wing lift in forward flight. Tiltrotor[edit] Main article: Tiltrotor A tiltrotor or proprotor tilts its propellers or rotors vertically for VTOL
VTOL
and then tilts them forwards for horizontal wing-borne flight, while the main wing remains fixed in place. Tiltjet[edit] Main article: Tiltjet Similar to tiltrotor concept, but with turbojet or turbofan engines instead of ones with propellers. Tiltwing[edit] Main article: Tiltwing A tiltwing has its propellers or rotors fixed to a conventional wing and tilts the whole assembly to transition between vertical and horizontal flight. Tail-sitter[edit] Main article: Tail-sitter A tail-sitter sits vertically on its tail for takeoff and landing, then tilts the whole aircraft forward for horizontal flight. Vectored thrust[edit] Main article: Thrust vectoring Thrust vectoring
Thrust vectoring
is a technique used for jet and rocket engines, where the direction of the engine exhaust is varied. In VTOL, the exhaust can be varied between vertical and horizontal thrust. Lift jets[edit] Main article: Lift jet A lift jet is an auxiliary jet engine used to provide lift for VTOL operation, but may be shut down for normal wing-borne flight. Lift fans[edit] Main article: Lift fan Lift fan is an aircraft configuration in which lifting fans are located in large holes in an otherwise conventional fixed wing or fuselage. It is used for V/ STOL
STOL
operation. The aircraft takes off using the fans to provide lift, then transitions to fixed-wing lift in forward flight. Several experimental craft have been flown, but only the F-35 Lightning II
F-35 Lightning II
entered into production. Lift via Coandă effect[edit] Main article: Coandă effect Aircraft
Aircraft
in which VTOL
VTOL
is achieved by exploiting the Coandă effect are capable of redirecting air much like thrust vectoring, but rather than routing airflow through a duct, the airflow is simply routed along an existing surface, which is usually the body of the craft allowing less material and weight. The Avro Canada
Avro Canada
VZ-9 Avrocar, or simply the VZ-9, was a Canadian VTOL
VTOL
aircraft developed by Avro Aircraft
Aircraft
Ltd. which utilizes this phenomenon by blowing air into a central area, then it is directed down over the top surface, which is parabolic and resembles a bowed flying saucer. Due to the Coandă effect, the airflow is attracted to the nearest surface and continues to move along that surface despite the change in the surface's direction away from the airflow. The craft is designed to direct the airflow downward to provide lift. Gallery[edit]

Play media

F-35 flight, transition to STOVL
STOVL
configuration, vertical take off, inflight re-fueling, vertical hover and landing

Play media

F-35 vertical landing

See also[edit]

Aviation portal

Circular wing List of Nikola Tesla
Nikola Tesla
patents List of VTOL
VTOL
aircraft McDonnell Douglas DC-X Mono tiltrotor Peter Bielkowicz Proprotor PTOL Quad (rocket) Reusable Vehicle Testing project of the Japanese Space Agency JAXA Rotor wing Thrust reversal Thrust vectoring

References[edit] Notes[edit]

^ Laskowitz, I.B. "Vertical Take-Off and Landing
Landing
(VTOL) Aircraft." Annals of the New York Academy of Sciences, Vol. 107, Art.1, 25 March 1963. ^ a b Khurana KC (2009). Aviation Management: Global Perspectives. p. 133.  ^ Yefim Gordon, The History of VTOL, page 28 ^ John Whiteclay Chambers, The Oxford Companion to American Military History, Oxford University Press, USA, 1999, page 748 ^ "U.S. Patent 1,655,113." US Patent Office. Retrieved; 10 July 2011. ^ By A.J.S. RAYL, Nikola Tesla's Curious Contrivance, Air & Space Magazine, September 2006 – online ^ a b globalsecurity.org, Military Aircraft, Rotary, Tiltrotor ^ Allen 2007, pp. 13–20. ^ "The new Vertijet's straight-up flight: X-13 takes off like a rocket, lands tailfirst." Life, 20 May 1957, pp. 136–140, 142. ^ Simonsen, Erik. "Another one for the X files: The Boeing Canard Rotor/Wing demonstrator officially becomes X-50A." Boeing.com. Retrieved: May 24, 2015. ^ Boniface 2000, p. 74. ^ Norton 2004, pp. 6–9, 95–96. ^ "BAE animates mothballed Intercity Vertical-Lift Aircraft." Aerospace-technology.com. Retrieved: 24 May 2015.[unreliable source?] ^ "Forgotten 1960s ‘Thunderbirds’ projects brought to life." BAE Systems. Retrieved: 24 May 2015. ^ "Vertical take-off/landing aircraft: Yak-38." Yakovlev
Yakovlev
Design Bureau, 16 July 2008. Retrieved: 10 July 2011. ^ Jackson 1976, p. 143. ^ "Lunar Landing
Landing
Research Vehicle." Dryden Flight Research Center. Retrieved: 10 July 2011. ^ "Airfoil". Basics of Aeronautics. Retrieved: 24 May 2015. ^ "Reusable rocket prototype almost ready for first liftoff". Spaceflight Now. 2012-07-09. Retrieved 2012-07-13. SpaceX
SpaceX
has constructed a half-acre concrete launch facility in McGregor, and the Grasshopper rocket is already standing on the pad, outfitted with four insect-like silver landing legs.  ^ "Grasshopper Completes Highest Leap to Date". SpaceX.com. 10 March 2013. Retrieved 11 March 2013.  ^ The Grasshopper prototype test vehicle has been retired. "Grasshopper flies to its highest height to date". Social media information release. SpaceX. 12 October 2013. Retrieved 14 October 2013. WATCH: Grasshopper flies to its highest height to date – 744 m (2441 ft) into the Texas sky. http://youtu.be/9ZDkItO-0a4 This was the last scheduled test for the Grasshopper rig; next up will be low altitude tests of the Falcon 9
Falcon 9
Reusable (F9R) development vehicle in Texas followed by high altitude testing in New Mexico.  ^ " Blue Origin
Blue Origin
make historic rocket landing." Blue Origin, November 24, 2015. Retrieved: November 24, 2015. ^ [1] ^ "Reusable rockets cheaper." ZME Science, August 20, 2015. Retrieved: November 24, 2015.

Bibliography[edit]

Allen, Francis J. "Bolt upright: Convair's and Lockheed's VTOL fighters". Air Enthusiast (Key Publishing), Volume 127, January/February 2007. ISSN 0143-5450. Boniface, Patrick. "Tilt-wing Testing". Aeroplane, Vol. 28, no. 3, March 2000, pp. 72–78. Campbell, John P. Vertical Takeoff
Takeoff
& Landing
Landing
Aircraft. New York: The MacMillan Company, 1962. Harding, Stephen. "Flying Jeeps: The US Army's Search for the Ultimate 'Vehicle'". Air Enthusiast, No. 73, January/February 1998, pp. 10–12. Stamford, Lincs, UK: Key Publishing. ISSN 0143-5450. Jackson, Paul A. German Military Aviation 1956–1976. Hinckley, Leicestershire, UK: Midland Counties Publications, 1976. ISBN 0-904597-03-2. Khurana, K. C. Aviation Management: Global Perspectives. Singapore: Global India Publications, 2009. ISBN 978-9-3802-2839-6. Markman, Steve and Bill Holder. Straight Up: A History of Vertical Flight. Atglen, Pennsylvania: Schiffer Publishing, 2000. ISBN 0-7643-1204-9. Norton, Bill. Bell Boeing V-22 Osprey, Tiltrotor
Tiltrotor
Tactical Transport. Earl Shilton, Leicester, UK: Midland Publishing, 2004. ISBN 1-85780-165-2. Rogers, Mike. VTOL: Military Research Aircraft. New York: Orion Books, 1989. ISBN 0-517-57684-8. Büchi, Roland. Fascination Quadrocopter. Norderstedt, BoD, English Version, 2011. ISBN 978-3-8423-6731-9

External links[edit]

Look up VTOL
VTOL
in Wiktionary, the free dictionary.

Wikimedia Commons has media related to VTOL
VTOL
aircraft.

Doak VZ-4 image V/ STOL
STOL
Wheel of Misfortune – Timeline of V/ STOL
STOL
aircraft, page 5 Tiltplane VTOL
VTOL
Aircraft

v t e

Types of takeoff and landing

Takeoff

Assisted take-off Balanced field takeoff JATO Non-rocket spacelaunch Rejected takeoff Rocket launch Zero-length launch

Takeoff
Takeoff
and landing

CATOBAR CTOL STOBAR STOL STOVL V/STOL VTHL/VTOHL VTOL Launch and recovery cycle VTVL VTHL HTHL HTVL

Landing

Belly landing Corkscrew landing Crosswind landing Deadstick landing Emergency landing Forced landing Hard landing SRVL Short-field landing Soft landing Splashdown Touch-and-go landing Water landing
Water landing
/ Ditching Floating landing platform

Authority control

.