Supermarine Seal II

Based on the Supermarine Commercial Amphibian which achieved second place in an Air Ministry competition in 1920, the Supermarine Seal II prototype first flew on 21 May 1921. The designation Seal II is presumed to come from the Commercial Amphibian which was briefly named Seal before it crashed and was written off.

Testing by the RAF of the Seal II resulted in several changes, including a more powerful engine and relocation of the fuel tanks to the upper wing. Two additional prototypes were ordered, but were renamed Seagull before delivery. See these pages for photos and a brief history of the resulting Seagull II Seagull III and Seagull V (which became the Supermarine Walrus).

The Seal II and one of the prototypes were sold to the Imperial Japanese Navy Air Service for evaluation.