The Avro 531 Spider, was a British fighter biplane prototype.
It was a conventional configured sesquiplane with warren-type interplane struts.
When tested, it showed excepcionally good rates, handling and visibility, anyway the war office had already selected the Sopwith Snipe for mass production and had discarded this one.
A second version, the 531A was planned but never completed with some of it's components used to build the Avro 538 which was conceived as a racing airplane and had normal interplane struts. However it was never used with that purpose as it had a faulty wing spar, so it was used as a hack by Avro from May 1919 until September 1920.
Sources:
1. https://en.wikipedia.org/wiki/Avro_531_Spider
2. Salamander Books - The Complete Book of Fighters
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