The Avro 521 was a British two-seat fighter first flown late in 1915, based on the 504. Only a prototype of the Avro 521 was built. It was powered by a 110 hp (80 kW) Clerget engine, with a provision for a .303 in (7.7 mm) Lewis Gun in the rear cockpit.
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| loaded weight main |
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| power main |
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| power/mass main |
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| empty weight main |
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| First Flight |
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| jet or prop? |
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| loading alt |
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| plane or copter? |
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| Number Built |
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| abstract |
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