Development
The B.T. in the Beagle's designation stood for bomber and torpedo, the first aircraft that Blackburn had built for both roles. Its design was started to Air Ministry specification 24/25 for a high-altitude bomber, but was later modified to meet specification 23/25 for a day bomber, reconnaissance and torpedo aircraft.
The Beagle was a single-bay biplane with staggered and slightly swept wings. The fabric-covered wings, which did not fold as the aircraft was not intended for carrier service, had spruce spars and ribs with metal bracing. Four ailerons were fitted. The fuselage followed standard Blackburn practice with a steel tube centre section and wooden construction aft, though the final section was again of tube steel; covering was fabric throughout. Fin area was small and the rudder large, with a horn balance initially merging into the fin but later reduced, leaving a prominent step rather like of the Nautilus. The braced tailplane had significantly greater elevator than stabiliser area, the former again having prominent horn balances.
The undercarriage was of the split type required by the torpedo dropping role, but a carrier mechanism between the legs could also hold a 185 imp gal (840 L) fuel tank for reconnaissance work. Cockpits were open with the pilot in front, armed with a forward-firing .303 in (7.7 mm) Vickers machine gun mounted on the port side. The gunner's cockpit was close to the pilot's for communication. He had a Scarff ring-mounted .303 in (7.7 mm) Lewis Gun, but to fulfil his role as torpedo or bomb aimer, he moved into a prone position in a station below the pilot's cockpit. This had a bomb sight used via an opening with a sliding door in the bottom of the fuselage and had bomb fusing and release controls plus altitude and airspeed gauges and a hand-operated rudder control for yaw corrections on target.
The Beagle was initially powered by a 460 hp (340 kW) Bristol Jupiter VIIIF radial engine mounted in a smooth and rather pointed nose cone, leaving the tops of the nine cylinders exposed. After the competitive trials it was re-engined with a supercharged 590 hp (440 kW) Jupiter XF, though the extra power seems not to have led to significant performance improvement. This installation had a more pointed cowling, with more cylinder head exposed for better cooling.
The Beagle flew first at Brough Aerodrome on 18 February 1928 piloted by W.S. Bulman. The rudder modification mentioned above was made before the aircraft went to competitive trial.
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