Deck-landing reconnaissance and Fleet gunnery spotting biplane, first flown in 1921. Twelve Bison Is built for the FAA in 1923. One converted to an Avro 555B amphibian with a central float. Main production during 1925-26 comprised 41 Bison IIs, each with the upper wing raised on struts above the fuselage and no dihedral. Operated from the aircraft carrier HMS Eagle in the Mediterranean, on board HMS Furious and at Hal Far, Malta.
| MODEL||Bison IA|
| ENGINE||1 x Napier Lion II, 336kW|
| Take-off weight||2631 kg||5800 lb|
| Empty weight||1887 kg||4160 lb|
| Wingspan||14.02 m||46 ft 0 in|
| Length||10.97 m||36 ft 0 in|
| Height||4.22 m||14 ft 10 in|
| Wing area||57.6 m2||620.00 sq ft|
| Max. speed||177 km/h||110 mph|
| Cruise speed||145 km/h||90 mph|
| Ceiling||4265 m||14000 ft|
| Range||547 km||340 miles|
| ARMAMENT||1 x 7.7mm machine-gun|
During the early 1920s directing the gunfire of the battleships was considered a far more important mission for carrier-based aircraft than either attacking enemy warships or defending the fleet from enemy air attack. Both the Avro Bison and the Blackburn Blackburn were specifically designed during that period to fulfill that mission. It is difficult to determine which of the two airplanes was uglier.
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