The AD Scout (also known as the Sparrow) was designed by Harris Booth of the British Admiralty's Air Department as a fighter aircraft for the anti-Zeppelin defense role during World War I.

The Scout was a decidedly unconventional aircraft - a biplane with a fuselage pod mounted on the upper wing. A twin-rudder tail was attached by four booms, and it was provided with an extremely narrow-track undercarriage. The primary armament was intended to be a 2 lb (900 g) recoil-less Davis Gun , but this was never fitted.

Four prototypes were built - two each by Hewlett & Blondeau and Blackburn. Trials proved the aircraft to be fragile, sluggish, and difficult to handle, even on the ground. The project was abandoned and all four prototypes scrapped.

Specifications (AD Scout)

General Characteristics

• Crew: one, pilot
• Length: 22 ft 9 in (6.93 m)
• Wingspan: 33 ft 5 in (10.18 m)
• Height: 10 ft 3 in (3.12 m)
• Wing area: ft² ( m²)
• Empty: lb ( kg)
• Loaded: lb ( kg)
• Maximum takeoff: lb ( kg)
• Powerplant: 1x Gnôme Monosoupape, 100 hp (75 kW)

Performance

• Maximum speed: 84 mph (135 km/h)
• Range: 210 miles (336 km)
• Service ceiling: ft ( m)
• Rate of climb: ft/min ( m/min)
• Wing loading: kg/m² ( lb/ft²)
• Power/Mass:

Armament (intended)

• 1x downward-firing .303 Lewis machine gun
• 1x 2-lb Davis recoilless gun

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