 Avro submitted their modified C105 design in May 1953 , essentially a two @-@ man version of the C104 / 2 . A change to a " shoulder @-@ mounted " wing allowed rapid access to the aircraft 's internals , weapons bay , and engines . The new design also allowed the wing to be built as a single structure sitting on the upper fuselage , simplifying construction and improving strength . The wing design required a long main landing gear that still had to fit within the thin delta wing , presenting an engineering challenge . Five different wing sizes were outlined in the report , ranging between 1 @,@ 000 ft2 and 1 @,@ 400 ft2 ( 93 m2 to 130 m2 ) ; the 1 @,@ 200 ft2 ( 111 m2 ) sized version was eventually selected . The engines considered for the aircraft were the Bristol Olympus OL @-@ 3 , the Curtiss @-@ Wright J @-@ 67 ( a US @-@ built version of the Olympus ) , or the Orenda TR.9 engines . 
