The dramatic successes of aircraft such as Hawker Hunter, the B-47, and F-86 embodied the widespread acceptance of the swept wing research acquired from Germany. Eventually, almost all advanced design efforts would incorporate a swept wing configuration. The classic Boeing B-52, designed in the 1950s, continues in service as a high-subsonic long-range heavy bomber despite the development of the triple-sonic North American B-70 Valkyrie, supersonic swing-wing Rockwell B-1 Lancer, and flying wing designs. While the Soviets never matched the performance of the Boeing B-52 Stratofortress with a jet aircraft, the intercontinental range Tupolev Tu-95 turboprop bomber with its near-jet class top speed of 920 km/h, combining swept wings with propeller propulsion, also remains in service today, being the fastest propeller-powered production aircraft. In Britain, a range of swept-wing bombers were designed, these being the Vickers Valiant (1951), the Avro Vulcan (1952), and the Handley Page Victor (1952).