A.Jackson Avro Aircraft since 1908 (Putnam)

Avro 509
  Type number first used for a set of tanks and strut sockets supplied to the Walsh brothers for the first Walsh flying boat, built at Orakei, Auckland, in August 1913. Evidently these components were later considered unworthy of a special type number as the designation Avro 509 was reissued in November 1913 to a projected radio equipped twin-float seaplane. This was a three-seater, three-bay biplane with two 120 hp Austro-Daimler engines outboard and a heavy calibre gun in the nose. A contract, to the value of £3,384, for one prototype was awarded by the Admiralty in January 1914 and serial 94 was allocated. However the machine was not built, possibly because of there being insufficient capital available to finance its construction. Span (upper) 80 ft 0 in, (lower) 56 ft 0 in. Length 44 ft 3 in. Wing area 931 sq ft. Tare weight 2,800 lb. All-up weight 4,510 lb. Maximum speed 70 mph.

Avro 512
  A projected landplane with one 65 hp Austro-Daimler engine. Span 26 ft 0 in.

Avro 513
  A design study made in March 1914 for a two seat, twin-float bomber seaplane powered by two 80 hp Gnome engines. Wings were designed to fold, and floats and flying surfaces were interchangeable with those of the Avro 510. Span (upper) 72 ft 0 in, (lower) 47 ft 0 in. Length 36 ft 6 in.

Avro 515
  Layout for a biplane with one 150 hp Sunbeam engine, September 1914.
Avro 516
  A monoplane with one 80 hp Gnome considered in January 1915.

Avro 517
  Layout for a biplane version of the Avro 516, February 1915

Avro 518
  A projected single-seater with one 150 hp Sunbeam engine, May 1915

Avro 520
  Designs for a single-seat landplane with one 150 hp Sunbeam engine for the Royal Navy, May 1915.

Avro 524
  A projected scout with one 80 hp engine.

Avro 525
  Layout for a single-seat ground attack fighter to RAF Type II; November 1915.
Avro 526
  Similar to the Avro 525 but with monoplane tail unit.