V/STOL

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RAF Harrier GR9 arrives at RIAT 2008
A U.S. Marine Corps MV-22 Osprey prepares to land aboard a ship

A vertical and/or short take-off and landing (V/STOL) aircraft is an airplane able to take-off or land vertically or on short runways. Vertical takeoff and landing (VTOL) aircraft are a subset of V/STOL craft that do not require runways at all. Generally, a V/STOL aircraft needs to be able to hover. Helicopters are not considered under the V/STOL classification as the classification is only used for airplanes, aircraft that achieve lift in forward flight by planing the air, thereby achieving speed and fuel efficiency that is typically greater than helicopters are capable of.

Most V/STOL aircraft types were experiments or outright failures from the 1950s to 1970s. V/STOL aircraft types that have been produced in large numbers include the Harrier, Yak-38 Forger and V-22 Osprey.

A rolling takeoff, sometimes with a ramp (ski-jump), reduces the amount of thrust required to lift an aircraft from the ground (compared with vertical takeoff), and hence increases the payload and range that can be achieved for a given thrust. For instance, the Harrier is incapable of taking off vertically with a full weapons and fuel load. Hence V/STOL aircraft generally use a runway if it is available. I.e. short takeoff and vertical landing (STOVL) or conventional takeoff and landing (CTOL) operation is preferred to VTOL operation.

V/STOL was developed to allow fast jets to be operated from clearings in forests, from very short runways, and from small aircraft carriers that would previously only have been able to carry helicopters.

The main advantage of V/STOL aircraft is closer basing to the enemy, which reduces response time and tanker support requirements. In the case of the Falklands War, it also permitted high performance fighter air cover and ground attack without a large aircraft carrier equipped with a catapult.

The latest V/STOL aircraft is the F-35B, which is expected to enter service in 2016.[1]

Lists of V/STOL aircraft[edit]

This is a partial list, there have been many designs for V/STOL aircraft.

Fan-in-Wing[edit]

  • Ryan XV-5. Gas driven fans in wings with half-trash can lid covers. Crashed when rescue dummy was ingested by fans.

Vectored thrust[edit]

  • Hawker P.1127/Kestrel/Harrier; four rotating nozzles for vectored thrust of fan and jet exhaust. Most successful V/STOL in history, most successful modern subsonic fighter.

Tilt-jet[edit]

Tilt-rotor[edit]

Tilt-wing[edit]

Separate thrust and lift[edit]

Supersonic[edit]

Although many aircraft have been proposed, built, and some even tested, the F-35B is expected to be the first supersonic VTOL aircraft in operational service.

References[edit]

  1. ^ "Report: F-35 Work Falls Behind Two More Years." CQ Politics, 23 July 2009.
  2. ^ Kjelgaard, Chris (Senior Editor). "From Supersonic to Hover: How the F-35 Flies." space.com, 21 December 2007.

External links[edit]