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[Updated on 02 May 2023] Frank B. Halford was a talented independent British engine designer of the early and mid-twentieth century who worked for a number of manufacturers including de Havilland, Cirrus and Fiat. In 1928, he contracted with Napier for design of a series of air-cooled engines in a vertical H configuration having twin crankshafts geared together. There were two basic types, the 16-cylinder Rapier and the 24-cylinder Dagger. The Rapier, produced in small numbers, powered the Short Mercury seaplane. By 1935, the Dagger served a large military market, and the British Air Ministry ordered it in quantity. Both the lower powered Dagger I and Dagger II versions powered the Hawker Hart aircraft. The final version, the 712 kW (955 shp) Dagger VIII, powered the Fairey Battle I and Handley Page H.P.52 Hereford I. Source https://airandspace.si.edu/collection-objects/napier-halford-dagger-series-ii-h-24-engine/nasm_A19710930000
import "engine_sim.mr" import "themes/default.mr" import "engines/oror/napier_dagger.mr" use_default_theme() set_engine(eng()) set_vehicle(veh())