Flying Boat - Post World War II

Post World War II

The Hughes H-4 Hercules, in development in the U.S. during the war, was even larger than the BV 238 but it did not fly until 1947. The "Spruce Goose", as the H-4 was nicknamed, was the largest flying boat ever to fly. That short 1947 hop of the "Flying Lumberyard" was to be its last, however; it became a victim of post-war cutbacks and the disappearance of its intended mission as a transatlantic transport.

In 1944, the Royal Air Force began development of a small jet-powered flying boat that it intended to use as an air defence aircraft optimised for the Pacific, where the relatively calm sea conditions made the use of seaplanes easier. By making the aircraft jet powered, it was possible to design it with a hull rather than making it a floatplane. The Saunders-Roe SR.A/1 prototype first flew in 1947 and was relatively successful in terms of its performance and handling. However, by the end of the war, carrier based aircraft were becoming more sophisticated, and the need for the SR.A/1 evaporated.

During the Berlin Airlift (which lasted from June 1948 until August 1949) 10 Sunderlands and two Hythes were used to transport goods from Finkenwerder on the Elbe near Hamburg to isolated Berlin, landing on the Havelsee beside RAF Gatow until it iced over. The Sunderlands were particularly used for transporting salt, as their airframes were already protected against corrosion from seawater. Transporting salt in standard aircraft risked rapid and severe structural corrosion in the event of a spillage. In addition, three Aquila flying boats were used during the airlift. This is the only known operational use of flying boats within central Europe.

After World War II the use of flying boats rapidly declined, though the U.S. Navy continued to operate them (notably the Martin P5M Marlin) until the early 1970s. The Navy even attempted to build a jet-powered seaplane bomber, the Martin Seamaster. Several factors contributed to the decline. The ability to land on water became less of an advantage owing to the considerable increase in the number and length of land based runways during World War II. Further, as the speed and range of land-based aircraft increased, the commercial competitiveness of flying boats diminished; their design compromised aerodynamic efficiency and speed to accomplish the feat of waterborne takeoff and landing. Competing with new civilian jet aircraft like the de Havilland Comet and Boeing 707 proved impossible.

BOAC ceased flying boat services out of Southampton in November 1950.

Bucking the trend, in 1948 Aquila Airways was founded to serve destinations that were still inaccessible to land-based aircraft. This company operated Short S.25 and Short S.45 flying boats out of Southampton on routes to Madeira, Las Palmas, Lisbon, Jersey, Majorca, Marseilles, Capri, Genoa, Montreux and Santa Margherita. From 1950 to 1957, Aquila also operated a service from Southampton to Edinburgh and Glasgow. The flying boats of Aquila Airways were also chartered for one-off trips, usually to deploy troops where scheduled services did not exist or where there were political considerations. The longest charter, in 1952, was from Southampton to the Falkland Islands. In 1953 the flying boats were chartered for troop deployment trips to Freetown and Lagos and there was a special trip from Hull to Helsinki to relocate a ship's crew. The airline ceased operations on 30 September 1958.

The technically advanced Saunders-Roe Princess first flew in 1952 and later received a certificate of airworthiness. Despite being the pinnacle of flying boat development none were sold, though Aquila Airways reportedly attempted to buy them. Of the three Princesses that were built, two never flew, and all were scrapped in 1967. In the late 1940s Saunders-Roe also produced the jet-powered SR.A/1 flying boat fighter, which did not progress beyond flying prototypes.

Helicopters ultimately took over the air-sea rescue role.

The land-based P-3 Orion and carrier-based S-3 Viking became the U.S. Navy's fixed-wing anti-submarine patrol aircraft.

Ansett Australia operated a flying boat service from Rose Bay to Lord Howe Island until 1974, using Short Sandringhams.