 Almost every fighter project in the postwar era immediately applied the concept , which started appearing on production fighters in the late 1940s . Avro engineers explored swept @-@ wing and tail modifications to the CF @-@ 100 known as the CF @-@ 103 , which had proceeded to wooden mock @-@ up stage . The CF @-@ 103 offered improved transonic performance with supersonic abilities in a dive . However , the basic CF @-@ 100 continued to improve through this period , and the advantages were continually eroded . When a CF @-@ 100 broke the sound barrier on 18 December 1952 , interest in the CF @-@ 103 waned . 
