Convair XP6Y

The Convair XP6Y, also called the P6Y, was an unbuilt anti-submarine warfare flying boat that Convair designed in the 1950s to a United States Navy requirement. It was to use boundary layer control for slow-speed flight so that it could alight on the open ocean in rough seas and lower a dipping sonar. Its most distinctive features were an extremely large swept vertical fin and a thimble nose radome. The Navy ordered two prototypes as XP6Y-1 and preferred the design to its rival, the Martin P7M SubMaster, but budget constraints stopped both, the contract was cancelled, and the Navy chose the land-based P-3 Orion instead.