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Wednesday, April 25, 2018

Taking Off


VTOL, STOL, CTOL, STOVL

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. Some VTOL aircraft can operate in other modes as well, such as CTOL (conventional take-off and landing), STOL (short take-off and landing), and/or 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 is a subset of V/STOL (vertical and/or short take-off and landing).

Besides the ubiquitous helicopter, there are currently two types of 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 aircraft have been proposed and are under development as of 2017). Generally speaking, VTOL aircraft capable of STOVL use it wherever possible, since it typically significantly increases takeoff weight, range or payload compared to pure VTOL.

Harrier Jump Jet, is a family of jet-powered attack aircraft capable of vertical/short takeoff and landing operations (V/STOL). Originally developed by UK manufacturer Hawker Siddeley in the 1960s, the Harrier emerged as the only truly successful V/STOL design of the many attempted during that era, despite being a subsonic aircraft, unlike most of its competitors. It was conceived to operate from improvised bases, such as car parks or forest clearings, without requiring large and vulnerable air bases. Later, the design was adapted for use from aircraft carriers

Marines are different kind of breed. During its heydays with the US Marine Corps, Harriers had been the main stay of close air support during beachhead landings. Its treasured by Marine Coprs and its driven by US Marine Lt GEN rank

The Hawker Siddeley Harrier is the first generation-version and is also known as the AV-8A Harrier; it was used by multiple air forces, including the Royal Air Force (RAF) and the United States Marine Corps (USMC). The Sea Harrier is a naval strike/air defence fighter derived from the Hawker Siddeley Harrier; it was operated by both the Royal Navy and the Indian Navy. During the 1980s, a second generation Harrier emerged; manufactured in the United States as the AV-8B and in Britain as the British Aerospace Harrier II respectively. By the start of the 21st century, the majority of the first generation Harriers had been withdrawn, many operators having chosen to procure the second generation as a replacement. In the long term, several operators have announced their intention to supplement or replace their Harrier fleets with the STOVL variant of the F-35 Lightning II, designated as the F-35B

As of June 2015, the STOVL variant of the F-35 Lightning II (formerly the Joint Strike Fighter), designated as the F-35B, is intended to replace the AV-8B Harrier II in service with the US Marine Corps while the RAF and Royal Navy are scheduled to introduce the F-35B in 2016 with their first F35 unit, 617 Squadron and the Italian Navy in 2018–2019

During 2010, it was announced that the RAF and RN would retire their remaining Harriers by 2011, and in December 2010 the RAF's Harrier GR9s made their last operational flights. In June 2011, the MoD denied press reports that the aircraft were to be sold to the US Marine Corps for spares to support their AV-8B fleet. However, at the end of November 2011, the Defence Minister Peter Luff announced the sale of the final 72 Harriers to the US Marine Corps. As many as possible of the 72 Harrier GR9s will be converted to match AV-8B Night Attack configuration to augment the total AV-8B end strength (this will allow the USMC to retire some high-flight-hour F/A-18D aircraft), while the remaining aircraft will be used as spare parts sources for the airworthy fleet

During the first half of 2016, the Indian Navy retired the last of their remaining 11 Sea Harriers, which had been operating from the INS Viraat (formerly the HMS Hermes), in favour of the conventional Mikoyan MiG-29K

STOL is an acronym for a short takeoff and landing aircraft with short runway requirements for takeoff and landing. Many STOL-designed aircraft also feature various arrangements for use on runways with harsh conditions (such as high altitude or ice). STOL aircraft, including those used in scheduled passenger airline operations, have also been operated from STOLport airfields which feature short runways or aircraft carriers’ short runways

Have you ever seen aircraft moving forward and back in air and land?

F35 lightning II are doing STOVL and V22 Ospreys are doing VTOL plus V22 Ospreys can back up in the air on their own. C130 Hercules also can back it up on their own on the ground.

USAF F-22 Raptors 

I am obligated to write up about F-22 Raptors which was manufactured in South Korea by Lockheed Martin and ROK Aerospace Engineers during 1990s

The F-22 Raptor defines air dominance. The 5th Generation F-22’s unique combination of stealth, speed, agility, and situational awareness, combined with lethal long-range air-to-air and air-to-ground weaponry, makes it the best air dominance fighter in the world.

F-22 Raptor has delivered on its promise to provide unprecedented air dominance. The F-22 has demonstrated precision attack capabilities, defeating both air- and ground-based threats with unparalleled lethality and survivability.

The F-22’s ability to collect and share tactical information with friendly assets enables U.S. and allied forces to engage targets with unmatched battle space awareness. The Raptor makes other coalition aircraft more survivable.

The F-22 is the world’s most dominant fighter, but potential adversaries continue to develop capabilities intended to challenge the ability of U.S. and allied air forces to gain and maintain air superiority. With that in mind, Lockheed Martin is dedicated to working with the U.S. Air Force on a robust F-22 combat enhancement program to bolster the Raptor’s asymmetric advantage over current and potential adversaries. The capabilities of the F-22 Raptor remain essential to deter and defeat threats and ensure regional and global security well into the future.






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