Avro 501

{{Infobox aircraft

|name=501

|image=Авро 501 (503).jpg

|caption=

|type=Military utility seaplane

|manufacturer=Avro

|national_origin=United Kingdom

|designer=

|first_flight=January 1913

|introduction=

|retired=

|status=

|primary_user=

|more_users=

|produced=

|number_built=1 – 501
4 – 503

|variants=

}}

The Avro Type H, Type 501, and Type 503 were a family of early British military seaplanes. They were a development of the Avro 500 design and were originally conceived of as amphibious, the prototype being fitted with a single large main float (equipped with wheels) under the fuselage, and two outrigger floats under the wings.

Design and development

Tests were conducted on Windermere in January 1913. It was later converted to a twin-float configuration and bought by the British Admiralty. It now, however, proved too heavy and was converted again – this time to a landplane.{{cite book |last=Jackson |first=A.J.|title=Avro Aircraft since 1908 |year=1990|edition=Second |publisher= Putnam|location= London|isbn=0-85177-834-8 }}

An improved version, designated the 503, was demonstrated to the Inspector of Naval Aircraft, who placed an order for three machines. The prototype itself was demonstrated for the Imperial German Navy in its seaplane trials in June 1913 and was purchased by the government of the German Empire for evaluation purposes. This machine subsequently became the first aircraft to fly across the North Sea, from Wilhelmshaven to Heligoland, in September 1913. Gotha purchased a licence from Avro and produced the type as the WD.1 (Wasser Doppeldecker – "Water Biplane").

Operators

File:Avro 501.jpg in January 1913. Used for training at Royal Naval Air Station Eastchurch.Thetford, Owen, British Naval Aircraft Since 1912: Sixth Revised Edition, Annapolis, Maryland: Naval Institute Press, 1991, {{ISBN|1-55750-076-2}}, p. 400.}}]]

;{{flag|German Empire}}