Supermarine Sea Urchin

The Supermarine Sea Urchin was a proposed British racing biplane flying boat developed by Supermarine Aviation Works with the intention of entering the 1924 Schneider Trophy competition. This single-seat biplane was designed to be powered by a Rolls-Royce Condor V-12 water-cooled engine, which was to be installed within the fuselage. The engine would have transmitted power to a pusher propeller located on the upper wing through a system of geared shafts. However, the project was ultimately discontinued before construction due to technical difficulties involving the engine and the complex transmission mechanism needed to operate the propeller.

Sources

• Andrews, Charles Ferdinand; Morgan, Eric B. (1981). Supermarine Aircraft since 1914. London: Putnam. ISBN 978-03701-0-018-0.