The Harrier II: How a Vertical-Takeoff Jet Redefined Modern Close Air Support
In short: The AV-8B Harrier II transformed the limitations of early vertical-takeoff flight into a versatile combat machine. By pioneering the extensive use of carbon-fiber composites and a supercritical wing design, this aircraft allowed the U.S. Marine Corps to operate from simple forward bases, proving essential in conflicts from the Gulf War onward.
The Harrier II emerged from a need to overcome the range and payload constraints of the first-generation Hawker Siddeley Harrier. In the 1970s, the U.S. and UK attempted to develop a high-performance successor, the AV-16, but the project collapsed in 1975 due to rising costs and shifting defense priorities. McDonnell Douglas, however, persisted by tailoring a redesign specifically for the U.S. Marine Corps. By retaining the core Pegasus engine but introducing a larger, supercritical composite wing and a redesigned fuselage, the company created an aircraft that could carry significantly more weaponry while maintaining its signature vertical or short takeoff and landing (V/STOL) capability.
A defining feature of the Harrier II was its pioneering reliance on advanced materials. It became the first combat aircraft to incorporate carbon-fiber composites across a large portion of its structure, including the wings, rudder, and fuselage. This innovation reduced the total weight by 480 pounds compared to traditional metal construction, allowing for a 6,700-pound increase in payload capacity. The aircraft also featured lift-improvement devices on the underside of the fuselage, which captured engine exhaust to provide extra lift during the critical takeoff phase, a necessity for operating from small ships or makeshift landing zones.
Throughout its service life, the Harrier II underwent several significant upgrades to remain relevant. The Night Attack variant introduced thermal imaging and digital navigation, while the Harrier II Plus integrated radar, enabling the use of beyond-visual-range missiles. Despite its versatility, the program faced bureaucratic hurdles, including repeated attempts by the U.S. Navy to cancel it in favor of the F/A-18 Hornet. The aircraft eventually saw extensive service in the Gulf War, Afghanistan, and Libya. As of 2026, the U.S. Marine Corps is retiring the fleet in favor of the F-35B Lightning II, marking the end of a 22-year production run that produced approximately 340 aircraft.
The Harrier II’s design philosophy focused on reducing pilot workload through hands-on-throttle-and-stick controls and advanced digital displays. While it maintained the operating fundamentals of its predecessor, the refinements made it fundamentally more capable. Its ability to operate from simple forward operating bases and small carriers made it a unique asset, though its high accident rate—linked to the complexity of vertical flight—remained a notable aspect of its operational history.
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- Summary by Intellect · source: McDonnell Douglas AV-8B Harrier II
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