Supermarine Scylla

The Supermarine Scylla was a British biplane flying boat of the 1920s built by Supermarine. It was designed by R. J. Mitchell, the company's chief designer, as an experimental wooden twin-engined biplane amphibian, and it was developed in parallel with the Supermarine Swan, both being intended as a replacement for the Royal Air Force's Felixstowe F5 flying boat. The Scylla was operated by the Royal Air Force at the Marine Aircraft Experimental Establishment at Felixstowe, where such experimental types were evaluated. Its related development was the Swan, which became the world's first twin-engine amphibian and the forerunner of the Southampton. The source for the Scylla is brief, so this entry records only what its Wikipedia article states about the aircraft's purpose, designer and operator.