srijeda, 17. ožujka 2010.

F/A-18 Hornet

The McDonnell Douglas (now Boeing) F/A-18 Hornet is a supersonic, all-weather carrier-capable multirole fighter jet, designed to attack both ground and aerial targets. The F/A-18 was derived from the YF-17 in the 1970s for use by the United States Navy and Marine Corps. The Hornet is also used by the air forces of several other nations. It has been the aerial demonstration aircraft for the U.S. Navy's Flight Demonstration Squadron, the Blue Angels, since 1986.

The fighter's primary missions are fighter escort, fleet air defense, suppression of enemy air defenses (SEAD), air interdiction, close air support and Aerial reconnaissance. Its versatility and reliability have proven it to be a valuable carrier asset, though it has been criticized for its lack of range and payload compared to its earlier contemporaries, such as the F-14 Tomcat in the fighter and strike fighter role, and the A-6 Intruder and A-7 Corsair II in the attack role.

F/A-18 Hornet provided the baseline design for the F/A-18E/F Super Hornet, a larger, evolutionary redesign of the F/A-18. Compared to the Hornet, the Super Hornet is larger, heavier and has improved range and payload capability. The F/A-18E/F was originally proposed as an alternative to a completely new aircraft to replace existing dedicated attack aircraft such as the A-6. The larger variant was also directed to replace the aging F-14 Tomcat, thus serving a complementary role with Hornets in the U.S. Navy, and serving a wider range of roles including refueling tanker, and electronic jamming platform.

The F/A-18 is a twin engine, mid-wing, multi-mission tactical aircraft. It is highly maneuverable, owing to its good thrust to weight ratio, digital fly-by-wire control system, and leading edge extensions (LEX). The LEX allow the Hornet to remain controllable at high angles of attack. This is because the LEX produce powerful vortices over the wings, creating turbulent airflow over the wings and thus delaying or eliminating the aerodynamic separation responsible for stall, allowing the Hornet's wings to generate lift several times the aircraft's weight, despite high angles of attack. The Hornet is therefore capable of extremely tight turns over a large range of speeds.

Canted vertical stabilizers are another distinguishing design element, and among the other design characteristics that enable the Hornet's excellent high angle-of-attack capability include oversized horizontal stabilators, oversized trailing edge flaps that operate as flaperons, large full-length leading edge slats, and flight control computer programming that multiplies the movement of each control surface at low speeds and moves the vertical rudders inboard instead of simply left and right. The Hornet's normally high angle-of-attack performance envelope was put to rigorous testing and enhanced in the NASA F-18 High Alpha Research Vehicle (HARV). NASA used the F-18 HARV to demonstrate flight handling characteristics at high angle-of-attack (alpha) of 65-70 degrees using thrust vectoring vanes. F/A-18 stabilators were also used as canards on NASA's F-15S/MTD.

The Hornet was among the first aircraft to heavily utilize multi-function displays, which at the switch of a button allow the pilot to perform either fighter or attack roles or both. This "force multiplier" capability gives the operational commander more flexibility in employing tactical aircraft in a rapidly changing battle scenario. It was the first Navy aircraft to incorporate a digital multiplex avionics bus, enabling easy upgrades.

The Hornet is also notable for having been designed with maintenance in mind, and as a result has required far less downtime than its heavier counterparts, the F-14 Tomcat and the A-6 Intruder. Its mean time between failure is three times greater than any other Navy strike aircraft, and requires half the maintenance time. For example, whereas replacing the engine on the A-4 Skyhawk required removing the aircraft's tail, the engine on the Hornet is attached at only three points and can be directly removed without excessive disassembly. An experienced maintenance crew can remove and replace an F/A-18 engine in only a couple of hours.

Specifications (F/A-18C/D)

General characteristics

  • Crew: F/A-18C: 1, F/A-18D: 2 (pilot and weapons system officer)
  • Length: 56 ft (17.1 m)
  • Wingspan: 40 ft (12.3 m)
  • Height: 15 ft 4 in (4.7 m)
  • Wing area: 400 ft² (38 m²)
  • Airfoil: NACA 65A005 mod root, 65A003.5 mod tip
  • Empty weight: 24,700 lb (11,200 kg)
  • Loaded weight: 37,150 lb (16,850 kg)
  • Max takeoff weight: 51,550 lb (23,400 kg)
  • Powerplant:General Electric F404-GE-402 turbofans
    • Dry thrust: 11,000 lbf (48.9 kN) each
    • Thrust with afterburner: 17,750 lbf (79.2 kN) each

Performance

Armament

  • Guns:20 mm (0.787 in) M61 Vulcan nose mounted gatling gun, 578 rounds
  • Hardpoints: 9 total: 2× wingtips missile launch rail, 4× under-wing, and 3× under-fuselage with a capacity of 13,700 lb (6,215 kg) external fuel and ordnance
  • Rockets:

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