The Klimov VK-1: The Centrifugal Turbojet That Powered the Early Jet Age

In the history of aviation, few powerplants bridged the gap between propeller-driven warfare and supersonic supersonic flight quite like the Klimov VK-1. As the first Soviet jet engine to enter massive, industrial-scale production, the VK-1 drove some of the most iconic aircraft of the early Cold War, most notably the swept-wing MiG-15 fighter that shocked Western observers over the skies of Korea.

Though its engineering roots lay across the English Channel, the VK-1 evolved into a rugged, high-thrust symbol of Soviet industrial might—and an engineering masterclass in squeezing maximum performance out of centrifugal-flow technology.

1. The British Blueprint: A Stroke of Diplomatic and Technical Irony

To understand the VK-1, one must look back to 1946. The Soviet Union, eager to catch up with Western advancements in gas turbine technology, found itself trailing behind British achievements. In a surprising display of post-war technological cooperation, the Labour government led by Clement Attlee—eager to foster good diplomatic ties—authorized the sale of Rolls-Royce Derwent and Nene turbojet engines to the USSR.

Soviet engineers, led by designer Vladimir Yakovlevich Klimov, meticulously reverse-engineered the Rolls-Royce Nene. Initially designated the RD-45, Klimov and his team quickly realized that simply copying the British design wasn’t enough. They needed more thrust, greater reliability, and materials capable of withstanding the punishing environment of high-performance military flight.

By scaling up airflow, reinforcing internal components, and upgrading metallurgy, Klimov birthed an entirely redesigned engine: the VK-1.

2. Design and Engineering Characteristics

Unlike the sleeker axial-flow turbojets favored in later decades, the VK-1 utilized a centrifugal-flow compressor.

• The Centrifugal Trade-off: Centrifugal compressors (which use a rotating impeller to fling air outward) are inherently rugged, resistant to compressor stalls, and relatively simple to manufacture. However, they force a wide engine diameter. This required aircraft built around the VK-1—like the MiG-15 and MiG-17—to feature characteristically stout, “tubby” fuselages to accommodate the girth of the compressor casing.
• Combustion and Turbine: The engine featured nine individual can-type combustion chambers arranged circularly, feeding into a single-stage axial turbine.
• The VK-1F Variant (Afterburner): To maximize combat performance, the later VK-1F variant introduced an afterburner (reheat), significantly boosting thrust for short bursts of supersonic-approaching acceleration during dogfights.

Key Specifications (Base VK-1)

• Type: Centrifugal-flow turbojet
• Length: 2,600 mm (102 in)
• Diameter: 1,300 mm (51 in)
• Dry Weight: 872 kg (1,922 lb)
• Maximum Thrust: 26.5 kN (5,955 lbf)
• Specific Fuel Consumption: ~1.07 lb/(lbf·h)

3. Operational Legacy: The Wings of the Cold War

The VK-1 became the beating heart of several critical Soviet aircraft platforms:

1. MiG-15 “Fagot”: The aircraft that shocked American forces in the Korean War. Powered by the VK-1 (and later the VK-1A), the MiG-15 could out-climb and out-dive many early Western opponents, proving to be a formidable adversary.
2. MiG-17 “Fresco”: An evolution of the MiG-15, the MiG-17 utilized the afterburning VK-1F engine to push transonic limits, serving as a staple interceptor across the Eastern Bloc and allied nations.
3. Ilyushin Il-28 “Beagle”: This twin-engine tactical bomber relied on the VK-1 to project high-subsonic striking power across medium ranges.

Production numbers were staggering. Across multiple state factories in the Soviet Union—and later under license in China as the Wopen WP-5—roughly 20,000 VK-1 engines were built.

4. An Unusual Afterlife: From Fighter Jets to Snow Blowers

By the late 1950s, centrifugal turbojets were largely eclipsed by axial-flow engines, which offered superior fuel efficiency and narrower frontal cross-sections for supersonic flight. Yet, the story of the VK-1 did not end on the scrap heap.

Because of their immense thrust and sturdy construction, retired VK-1 engines found a bizarre, highly practical second career. Bolted onto the chassis of heavy trucks or railroad snowplows, repurposed VK-1 engines were deployed across freezing regions of Russia and Eastern Europe. Blasting a jet exhaust stream onto snow-packed runways and rail switches melted ice and cleared deep drifts in seconds—a testament to the unyielding durability of Klimov’s engineering.