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In page Supermarine:

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With it looking likely that no British company would be entering an aircraft in the 1923 Schneider Trophy contest Scott-Paine was persuaded by the British organizers to enter. As Supermarine being in a poor financial state, Mitchell was restricted to modifying the Sea Lion II, the result which was designated Sea Lion III and proved to be uncompetitive. For the 1924 contest Mitchell began design work on a completely new flying-boat biplane design called the Sea Urchin, which would have been fitted with a Rolls-Royce engine. However, there was insufficient time to overcome a number of design issues which lead to Supermarine withdrawing from the event.[citation needed]