Conrado Bertorello

The Soviet MIG-31 was an extraordinary aircraft, even by Cold War standards. Weighing up to 46 tonnes at takeoff, this enormous interceptor could reach nearly 3,000 km/h and operate above 20 kilometres. Its two D-30F6 engines produced a combined 304 kN of afterburning thrust, but achieving such speeds demanded far more than powerful engines. At nearly Mach 3, aerodynamic heating becomes a serious structural challenge. Almost half its airframe was built from nickel-steel alloys, with another 16% titanium, while sophisticated variable geometry intakes slowed and compressed supersonic air before it entered the engines. These were engineering solutions to conditions that ordinary fighter aircraft were never designed to endure. But the MiG-31's most remarkable technology was arguably hidden inside its enormous nose. When introduced in 1981, its Zaslon became the world's first operational electronically scanned fighter radar, capable of tracking ten targets and engaging four simultaneously. At a time when most fighters still relied on mechanically scanning radars, this was a substantial technological achievement. More impressively, four MIG-31s could exchange targeting information through digital data links, coordinate interceptions without continuous ground guidance, and collectively defend an 800-900 kilometre frontage. The aircraft was built to protect the Soviet Union's vast northern approaches against US bombers, reconnaissance aircraft and increasingly, low flying cruise missiles such as those carried by American strategic bombers. Its size and limited agility were deliberate compromises for speed, range and interception capability. The MIG-31 changed the notion that Soviet fighters relied primarily on brute power. More than four decades later, modernized versions still serve in Russia's air-defence network.