VTOL is an abbreviation for Vertical Take-Off and Landing. VTOL describes
fixed-wing aircraftthat can lift off vertically. "Vertical lift” is the capability to execute a controlled vertical take-off and vertical landing with a mission payload [Rhett Flater, AHS International Executive Director and Michael Hirschberg, DARPA Aerospace Engineer] . This classification includes only a very few aircraft; helicopters, autogyros; balloons and airships are not normally considered VTOL. Some aircraftcan operate in VTOL mode in addition to others, such as CTOL(Conventional Take-off and Landing) and/or STOL(Short Take-Off and Landing). Others can only operate by VTOL, due to the aircraft lacking landing gearthat can handle horizontal motion.
Currently there are two types of practical VTOL aircraft in military service: craft using a
tiltrotor, such as the Bell Boeing V-22 Osprey, and craft using directed jet thrust such as the Harrier family.
1928, Nikola Teslareceived patents for an apparatus for aerial transportation. Tesla called it the " Flivver". It is one of the earliest examples of VTOL aircraft.
In late World War II, German designers studied the possibility of a VTOL aircraft, the
Heinkel Lerche, but the plan never got off the drawing board.
An early contribution to VTOL was Rolls-Royce's Thrust Measuring Rig ("flying bedstead") of 1953 . This led to the first VTOL engines as used in the first British VTOL aircraft, the
Short SC.1( 1957) which used 4 vertical lift engines with a horizontal one for forward thrust.
The idea of using the same engine for vertical and horizontal flight by altering the path of the thrust led to the
Bristol Siddeley Pegasusengine which used rotating ducts to direct thrust over a range of angles. 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 Harrierthough the supersonic Hawker Siddeley P.1154was cancelled in 1965 .
The Harrier is often flown in
STOVLmode which enables it to carry a higher fuel or weapon load over a given distance. The Indian Navyoperates Sea Harriers mainly from its aircraft carrier INS Viraat. The United States Marine Corps, and the Italian and Spanish Navies use the AV-8 Harrier II, an advanced derivative of the Harrier. The Harrier II will be replaced in the air arms of the US and UK by a STOVLvariant of the F-35 Joint Strike Fighter. NASAhas flown other VTOL craft such as the XV-15 research craft ( 1977), as have the Soviet Navyand " 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-50is a Canard Rotor/Wingprototype that utilizes a similar concept.
In the 1960s France developed a version of the
Dassault Mirage IIIcapable of attaining Mach 1. The Dassault Mirage IIIV(not to be confused with the Mirage 5) achieved transition from vertical to horizontal flight in March 1966 and reached Mach 1.3 in level flight a short time later.
Yak-38 Forgerwas the Soviet Navy's VTOL aircraft for their light carriers, cargoships, and capital ships. It was developed from the Yak-36 Freehandexperimental aircraft. Before the Soviet Union collapsed, a supersonic VTOL aircraft was developed as the Yak-38's successor, the Yak-141, which never went into production. The Yak-141, also called Yak-41was further developed into the Yak-43.
In the 1960s and early 70s Germany planned three different VTOL planes. One used the
F-104as a base for research for a V/STOLaircraft. 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 Luftwaffeand NATO. The EWR VJ 101C did perform free 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 Museumin Munich, Germany. The others were the VFW-Fokker VAK 191B light fighter and reconnaissance plane [http://www.deutsches-museum.de/flugwerft/sammlungen/senkrechtstarter/vak-191/] , and the Dornier Do 31E-3 (troop) transport [http://www.deutsches-museum.de/flugwerft/sammlungen/senkrechtstarter/do-31/] , prototypes of the two can be seen at the Deutsches Museum branch at OberschleißheimAirfield.
Canadair CL-84 Dynavert
The CL-84 was a
Canadian V/STOLturbine tilt-wing monoplane designed and manufactured by Canadairbetween 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. These trials involved military pilots from the United States, the United Kingdom and Canada. Two of the CL-84s crashed due to mechanical failures, but no loss of life occurred as a result of these accidents. Despite the fact that the CL-84 was very successful in the experimental and operational trials carried out between 1972 and 1974, no production contracts resulted.
Moller Skycaris a prototype personal VTOL aircraft -- literally, a "flying air vehicle" (PAV). It has, as of this date, never made the transition to level flight, nor has it ever flown with anybody on board.
Aircraft designed to operate in extraterrestrial environments often utilize VTOL. An example of this type of aircraft is the
LLRV. Spacecrafttypically operate in environments where runways or even a suitably flat surface for skids is nonexistent.
V-22 Ospreyis the world's first production tiltrotor aircraft, with one three-bladed proprotor, turbopropengine, and transmission nacellemounted on each wingtip. The Osprey is a joint service, multimission, military tiltrotor aircraftwith both a vertical takeoff and landing (VTOL) and short takeoff and landing capability ( STOL)(Vertical or Short Takeoff and Landing(V/STOL)) . It is designed to perform missions like a conventional helicopterwith the long-range, high-speed cruise performance of a turbopropaircraft. The FAA classifies the Osprey as a model of powered liftaircraft.Fact|date=May 2007
List of VTOL aircraft
Military flying saucers
Bristol Siddeley BS100- a ducted turbofan engine for VTOL use
Rolls-Royce RB.108- one of the first dedicated lift engines
Masten Space Systems- an aerospace company that that is developing a VTVL (Vertical Takeoff Vertical Landing) Spacecraft
* [http://www.militaryimages.net/photopost/data/520/Doak_VZ-4.jpgDoak VZ-4 image]
Wikimedia Foundation. 2010.
Look at other dictionaries:
VTOL — es el acrónimo inglés para Vertical Take Off and Landing que en castellano significa Despegue y Aterrizaje Verticales. Es una capacidad de ciertos aviones, no entran en esta consideración los helicópteros. En 1928 a Nikola Tesla se le concedieron … Enciclopedia Universal
vtol — [vtɔl] n. m. ÉTYM. 1964; sigle anglais de Vertical Take Off and Landing. ❖ ♦ Techn. Avion susceptible de décoller et d atterrir verticalement. Équivalent français recommandé : A. D. A. V. (avion à décollage et atterrissage verticaux). Appos. ||… … Encyclopédie Universelle
VTOL — sigla ES ingl. Vertical Take Off and Landing, decollo e atterraggio verticale … Dizionario italiano
VTOL — ☆ VTOL [vē′tôl΄ ] n. [v(ertical) t(ake)o(ff and) l(anding)] an aircraft, usually other than a helicopter, that can take off and land vertically … English World dictionary
VTOL — Dornier Do 31 bei der Erprobung 1967 Senkrechtstart und landung bezeichnet die Fähigkeit eines Flugzeugs, senkrecht und ohne Start und Landebahn starten und landen zu können. Ebenso gebräuchlich ist die englische Abkürzung VTOL, was für vertical… … Deutsch Wikipedia
VTOL — Un McDonnell Douglas AV 8B Harrier II de la Cuerpo de Marines de los Estados Unidos realizando un despegue vertical. VTOL (del inglés de Vertical Take Off and Landing, «despegue y aterrizaje verticales»),[1 … Wikipedia Español
VTOL — abbr. vertical take off and landing. * * * ˈvēˌtōl, ȯl abbreviation vertical takeoff and landing * * * /vee tawl /, n. Aeron. a convertiplane capable of taking off and landing vertically, having forward speeds comparable to those of conventional … Useful english dictionary
VTOL — Самолёт вертикального взлета и посадки фирмы McDonnell Douglas, штурмовик AV 8B+ Harrier II Самолёт вертикального взлёта и посадки, общепринятое сокращение СВВП или англ. VTOL Vertical Take Off and Landing самолёт, способный взлетать и садиться … Википедия
VTOL — Aéronef à décollage et atterrissage verticaux Un aéronef à décollage et atterrissage verticaux (dont l acronyme est ADAV) est un aéronef à voilure fixe conçu pour s affranchir des pistes qui lui sont normalement nécessaires pour le décollage et l … Wikipédia en Français
VTOL — vertical takeoff and landing … Military dictionary