The Aero Ae 04 was a Czechoslovakian biplane fighter aircraft of 1921. A development of the Ae 02, it was no more successful than its predecessor in attracting purchase orders, and it flew only in prototype form. Undaunted by the lack of interest, development continued as the A.18. Specifications (Ae 04) General characteristics -Crew: one, pilot -Length: 5.60 m (18 ft 4 in) -Wingspan: 7.70 m (25 ft 3 in) -Height: 2.70 m (8 ft 10 in) -Wing area: 14.6 m² (157 ft²) -Empty weight: 670 kg (1,474 lb) -Max takeoff weight: 900 kg (1,980 lb) -Powerplant: 1× BMW IIIa, 138 kW (185 hp) Performance -Maximum speed: 225 km/h (69 mph) -Service ceiling: 6,362 m (20,876 ft) -Rate of climb: 357 m/min (1,171 ft/min) Armament -2 x synchronised .303 Vickers machine guns

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Source: WikiPedia