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The 'F' Class were built to an Admiralty design for comparison with the experimental classes which had been approved a year earlier. They were double hulled and based largely on the design of the experimental 'V' Class but with an additional stern tube.
After trials F1 was given larger hydroplanes and substantial plane guards
F1 and F3 were fitted with Vickers diesels, whilst F2 was fitted with MAN diesels built under licence by Whites. These boats saw little in the way of war service apart from some local defence work and were quickly disposed of.
Five further boats F4 to F8 were cancelled after the outbreak of war.
2 Electric Motors 400hp.