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EAA’s Attic — RAF Course and Speed Calculator

eaas attic raf course and speed calculator Airplane GEEK EAA’s Attic — RAF Course and Speed Calculator

This piece originally ran in the July 2021 issue of EAA Sport Aviation magazine.

This Mk IIA course and speed calculator was a mechanical computer used by British and Commonwealth air forces during World War II. The computer, equipped with both a linear and a circular slide rule for drift, time, and distance calculations, was used until the E-6B — generally referred to by the British as the Dalton computer — saw widespread adoption. EAA’s example bears both Royal Air Force and Royal Canadian Air Force serial numbers, and is believed to be a wartime production model.

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