The Avro 504 was produced in Great Britain until 1927. The undercarriage included a long skid which was to prevent overturning. The elevators were unbalanced and the comma-type rudder was characteristic for the Avro 504. There were ailerons on both the upper and lower wings. Both wings and tailplane were of constant chord and had straight tips with rounded corners. Each wing panel had five main ribs and the spars were made of pine (U-1). The equal-span, two-bay wings were rigged with stagger (30 The wing centre section was supported by four struts. The circular cowling enclosed a rotary engine, which could be of several different types including the 100hp Gnome Monosoupape, 110hp Le Rhone and 130hp Clerget. The long fuselage of the Avro 504 was of rectangular section with four longerons, wire braced, box-girder type, with rounded top decking. The Avro 504K version, which appeared in 1918, had a new universal engine mounting which permitted more powerful types of engines to be fitted. The Avro 504J version (and later Avro 504K) became the standard trainer of the RFC in 1917 and several thousands were built during the First World War and and in the early 1920s. Designed as a successor to the Avro 500 the two-seat Avro 504 biplane - made its maiden flight in September 1913.
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