Scale Model Flight Test Prototypes Sunk in Lake May Provide Clues to Mystery. The Canadian-built CF-105 Avro Arrow is many things in aviation history, but more than anything else, it is an enigma. Aviation historians suggest the Avro Arrow was an aircraft well ahead of its time. A Canadian project from the start, the CF-105 was a large, delta-wing supersonic interceptor built to repel the bomber threat from the Soviet Union. During the 1950s at the height of the Cold War the Avro CF-105 Arrow project showcased many aviation firsts, including the first fly-by-wire flight control system and very impressive...