Miss Britain III as a Harmsworth Trophy challenger. In a 1933 race Scott-paine was narrowly defeated by the four-engined Miss America X. In 1934 Miss Britain III set the world record for a single-engined boat of 110.1 mph. Miss Britain III is now on display at the National Maritime Museum at Greenwich. Motor torpedo boats From 1933 Scott-Paine designed and built hard chine motor torpedo boats, and MA/SB anti-submarine boats, from 1935 having them accepted by the Admiralty. Scott-Paine and George Selman designed and built a new private venture PV70, a seagoing MTB with three marinised Rolls-Royce Merlin engines. The boat was launched in 1938, but although no orders came from the Admiralty, orders were received from friendly governments. PT boats In 1939 agreement was reached with the American Electric Launch Company (Elco) to purchase a British Power Boat 70-footer (later named PT9), as a template for American production under licence. PT9 was taken by the SS President Roosevelt to Elco’s works at New London, Connecticut. On 3 October Scott-Paine met President Roosevelt and senior Elco representatives at the White House to authorize the creation of a new naval arm, the PT Boat Squadrons. (PT boat was short for patrol torpedo boat). Production started at a new Elco factory at Bayonne, New Jersey in January 1940. The Canadian Power Boat Company was set up by Scott-Paine in 1940. This produced 39 boats, mainly MTBs. After the passing of Lend-Lease in 1941 comparative trials, nicknamed the Plywood Derbys, were held between rival American boatbuilders, Elco winning both. Elco went on to produce 754 70-, 77-, and PT boats, including Jack Kennedy’s PT109 as well as the boat that rescued General Douglas MacArthur from Corregidor. Later years In December 1944, Scott-Paine received a cheque for $200,000 with an accompanying letter of appreciation for his contributions made to the development of the PT boat from Secretary of the Navy James Forrestal. The money was from Elco and was brokered by legal teams, releasing Elco from any and all further liabilities concerning the license rights. In 1945 all contracts at both the Canadian and British Power boat Companies were cancelled. Scott-Paine was divorced in 1946 and married Margaret Dinkeldein, his secretary, in New York in the same year. His health had not been good for years and in April, two months later, he suffered a stroke. In 1948 he was made an American citizen.