Built to test Saunders' metal hull design by replacing the wooden one on a Supermarine Southampton II. The new hull showed signs of structural weakness after 50 hours. Despite strengthening, the hull continued to deteriorate and the test program ended at 75 hours. Saunders persisted with the design and the same construction technique was used on the Cutty Sark, Cloud, Windhover and London. Photo from: Air Force Museum of New Zealand