Yakovlev Yak-3

Soviet fighter design in the middle of the war worked under a permanent handicap: the engines. The Klimov VK-105 was reliable, well understood and produced in enormous numbers, and it was simply not powerful enough to compete with the Daimler-Benz engines it was going to meet. Alexander Yakovlev’s answer was the only one available to him — if the power could not be increased, the aeroplane around it had to be made lighter.

That thinking had already produced the Yak-1 and Yak-9, and it was pushed to its conclusion in the Yak-1M prototypes of 1943, from which the Yak-3 emerged. Every component was reviewed for weight, the wing was made smaller, and the result entered service in 1944 as one of the lightest single-engine fighters of the war.

The changes were systematic rather than dramatic. Wing area came down to about 14.85 m², the structure was revised with metal wing spars in place of wood where supply allowed, and the airframe was cleaned up aerodynamically to an extent Soviet production standards had not previously attempted — including a properly fitted, flush-riveted skin over the forward fuselage.

The most visible change was the removal of the oil cooler from under the nose; it was moved into the wing roots, which cut drag and gave the aircraft its distinctive clean chin. That detail matters beyond aerodynamics: it was the recognition feature by which the Luftwaffe would learn to identify what it was up against.

Empty, the Yak-3 weighed about 2,105 kg — several hundred kilograms less than the fighters it fought — on a wing spanning just 9.20 m over a fuselage 8.5 m long. On roughly 1,300 hp it reached about 646 km/h. More important than the top speed was what the low weight did to everything else: acceleration, climb, roll rate and turning circle were all exceptional, and below 4,000 m the aircraft could out-manoeuvre anything the Luftwaffe had in the East. Pilots converting to it from the Yak-9 reported that it climbed and turned like a different class of machine.

The price was paid where the Soviets had decided it did not matter. Range was short, the armament of one 20 mm ShVAK and two 12.7 mm machine guns was adequate rather than heavy, and performance fell away above 5,000 m. On the Eastern Front, where air combat happened low down over the battlefield in support of the ground armies, all three were acceptable trades. The Yak-3 was not built to escort bombers to Berlin; it was built to own the air over a Soviet tank breakthrough.

The clearest testimonial to the design came from the other side. The Yak-3 reached the front in numbers during the summer offensives of 1944, and German fighter units in the East were issued instructions to avoid combat below 5,000 m with Yakovlev fighters lacking an oil cooler under the nose — a description that identified the Yak-3 precisely, and an admission that in that part of the sky the Luftwaffe no longer expected to win. Soviet accounts also credit the type with a series of lopsided engagements in its first weeks at the front; those claims, like all claims of that summer from either side, are contested.

Formal warnings of that kind were rare, and they mark a real inversion. For most of the war German pilots in the East had enjoyed a margin of performance that let them choose their fights. By the summer of 1944, at the altitudes where the Eastern Front air war was actually fought, that margin had gone — and the order that acknowledged it is the single most quoted fact about the aircraft, because it was the enemy who wrote it.

The Yak-3 also equipped the one Western unit that fought with the Soviet air force: the Normandie-Niémen regiment of French volunteers, which flew on the Eastern Front from 1943 and converted to the type in 1944. Offered a choice of Allied aircraft, its pilots asked to keep the Yak — the strongest possible endorsement from men who could have flown Spitfires instead.

At the end of the war Stalin allowed them to keep the aeroplanes. In June 1945 the regiment flew its Yak-3s home to France, landing at Le Bourget in Soviet fighters wearing French markings — an image that did more for the aircraft’s reputation in the West than any specification could have, and the reason the Yak-3 is the one Soviet fighter of the war that Western audiences reliably recognise.

About 4,848 Yak-3s were built, the great majority with the VK-105PF2. A version with the more powerful VK-107A promised roughly 720 km/h and would have been among the fastest piston fighters of the war, but it suffered persistent overheating and structural problems and never entered service in meaningful numbers — the engine problem that had shaped the whole design reasserting itself at the last step.

Production continued after the war, and Yak-3s served with the air forces of Yugoslavia and Poland into the post-war years. Wartime examples were built partly of wood, which is why so few originals survive: the aircraft flying at air shows today are largely new-build machines produced in Russia from the 1990s using the original drawings.

The Yak-3 is the clearest expression in the war of designing for the fight you are actually having. Judged by the standards applied to a P-51 — high-altitude speed, range, heavy armament — it is an unimpressive aeroplane, short-legged and lightly armed, with performance that fades above 5,000 m. Judged by what the Soviet air force needed in 1944, it was very close to ideal.

That the Luftwaffe formally told its pilots to avoid it below 5,000 m settles the argument at the only altitude that counted. Yakovlev could not have the engine he wanted, so he built the lightest airframe that could carry the engine he had, and accepted every limitation that followed. The result was a fighter that was decisively better than its opponents in one specific band of sky — which happened to be the band in which the Eastern Front was decided.

• Yefim Gordon, Yakovlev’s Piston-Engined Fighters (Midland, Red Star).
• George Mellinger, Yakovlev Aces of World War 2 (Osprey).
• Hans Seidl, Stalin’s Eagles (Schiffer).