Delta wood (delta-drevesina, also called lignofol) was made by impregnating thin birch veneers with a phenol-formaldehyde resin and pressing them under heat into a hard, dense laminate. The result was strong, resistant to fire and immune to the corrosion that plagued metal aircraft — but heavier than the aluminium alloys used elsewhere. The Soviets adopted it deliberately: with duralumin reserved for bombers and in chronically short supply, a fighter that could be built largely of wood and resin in dispersed, low-skill-tolerant workshops was a strategic advantage in itself. The wing was even made detachable to ease transport and field repair. The trade-off — weight, and the labour-intensive, irritating job of sanding the laminate — was accepted as the cost of building fighters in the numbers the war demanded.

The light I-301 prototype was genuinely quick, but the production LaGG-3 was ordered to carry far more fuel — roughly doubling its range at Stalin’s insistence — and the extra tanks added weight the Klimov M-105 could not overcome. Contemporary verdicts were blunt: the aircraft was “too heavy for the engine installed.” The hoped-for M-106 never materialised, so designers instead spent the type’s whole career fighting the weight back out of it — deleting guns and fuel tanks, cleaning up the aerodynamics and fitting the boosted M-105PF. The best batches, notably the aerodynamically refined Series 66, were genuinely competitive fighters — but they arrived too late to rehabilitate the LaGG-3’s name.

The LaGG-3’s single greatest contribution was its airframe. In 1942, with the inline-engined fighter falling behind, Lavochkin’s team grafted a powerful air-cooled Shvetsov M-82 (ASh-82) radial onto the wooden fuselage. The transformation was dramatic: the same basic aircraft, now with far more power, became the La-5, judged superior in trials and rushed into production. It led directly to the La-5FN and the superb La-7 — frontline fighters that helped win air superiority over the Eastern Front. The “guaranteed coffin” had fathered one of the best fighter families of the war.

The LaGG-3 was a Soviet state product built to conserve strategic materials, never sold on an open market, so no trustworthy flyaway unit price survives in the public record. Its whole rationale was cheapness — wood and resin instead of aluminium, dispersed factories tolerant of unskilled labour — but that was measured in war-economy terms, not dollars. A modern “cost per flight hour” figure is a peacetime accounting metric that was neither computed nor published for wartime Soviet fighters: no reliable cost-per-flight-hour number exists for the type, and any precise figure you see attached to it should be treated as invention rather than record.