Fairmile A and B: the subchaser lineage

The Fairmile A used a hard-chine planing hull as a coastal subchaser, but its seakeeping limitations led to only a twelve-boat production run. The more successful Fairmile B combined modest speed with anti-submarine weapons and grew to a production total of about 650 boats. Crews often added weapons before the Royal Navy standardized heavier gun fits, turning local improvisation into a logistical requirement for common ammunition and support. Fairmile Bs served as assault transports at the Saint-Nazaire Raid, where twelve of the sixteen involved were lost, and as navigation launches during the Normandy landings, rescue craft, and subchasers. Their construction in Britain, Canada, the United States, Australia, New Zealand, and South Africa shows how a versatile coastal hull became part of Allied industrial mobilisation.