The Mosquito’s fuselage was moulded from thin sheets of birch and spruce plywood sandwiching a lightweight balsa core, formed in two halves over concrete or mahogany moulds and then bonded together with the equipment already fitted inside. The one-piece wing was built the same way. Wood was not a wartime compromise so much as a clever choice: it saved aluminium and skilled metalworkers for other aircraft, it produced an aerodynamically clean, light and strong airframe, and it let production be farmed out to an army of woodworking firms — cabinet-makers, coachbuilders and piano factories — across Britain, Canada and Australia. The main weakness surfaced in the heat and humidity of the Far East, where glues could fail and skins delaminate; better adhesives and reinforcement largely fixed it, though the “falling apart in the jungle” story is often overstated.

From December 1942, Mosquitoes of No. 109 Squadron pioneered Oboe, a blind-bombing system that used two ground stations in England to guide an aircraft along an arc and signal the precise release point. Flying high and fast, the Mosquito was the ideal Oboe carrier, and its target-marking flares gave the following heavy bombers an accuracy they had never had before — a key enabler of the Battle of the Ruhr. Pathfinder Mosquitoes flew tens of thousands of sorties for a loss rate widely cited at around 0.03%, the lowest of any Bomber Command type.

The FB Mk XVIII “Tsetse” replaced the four cannon with a single auto-loading 57 mm Molins gun — a modified six-pounder anti-tank weapon — for attacking U-boats and shipping. On 25 March 1944 a Tsetse helped sink U-976 off France. From late 1944 the Banff Strike Wing in Scotland, with British, Norwegian, Canadian and New Zealand crews, hammered German shipping along the Norwegian coast with cannon, rockets and bombs — one of the Mosquito’s deadliest campaigns.

The Mosquito was deliberately economical. By using non-strategic materials and semi-skilled woodworkers, it sidestepped the aluminium and skilled-labour bottlenecks that constrained metal aircraft. Wartime unit costs are hard to standardise, but a Mosquito is commonly cited at very roughly £10,000–13,000 — a fraction of a four-engined heavy bomber — while carrying a comparable blast bomb to Berlin with a crew of two rather than seven. Treat any single figure as an order-of-magnitude estimate: prices varied by mark, factory and year, and no reliable cost-per-flight-hour figure exists for a 1940s type. The handful of airworthy Mosquitoes flying today are, by contrast, among the most expensive warbirds in the world to restore and operate.