When did the Mk IIa series 1 Hurricanes first enter service ?
The Merlin XX engine on the Sea Hurricane generated 1460 hp at 6,250 ft and 1435 hp at 11,000 ft. Top speed was 322 mph at 13,500 ft and 342 mph at 22,000 ft. Sea Hurricane Mk XIIA Canadian - built Hurricane Mk XIIA converted into Sea Hurricanes .