J.Davilla Italian Aviation in the First World War. Vol.3: Aircraft M-W (A Centennial Perspective on Great War Airplanes 75)

Macchi M.4

  The final stage in the evolution of Macchi flying-boats derived from the L.1, the Macchi M.4 appeared in 1917. It was more powerful than the M.3, being tested with both a 300-hp (224-kW) Fiat A.12 engine and a 420-hp (313-kW) F.T.; with the latter it had a maximum speed of 118 mph (190 km/h). One of the two examples built was used in tests with a Vickers COW gun for anti-submarine attack, but it was armed normally with a single machine-gun and carried a heavier bomb load than the M.3. With the end of the war and appearance of the M.9, development was abandoned.


Macchi M.4 Two-Seat Reconnaissance and Bomber Flying Boat with One 300-hp Fiat A.12 Engine
  Wing span 16,00 m; length 9,95 m; height 3,22 m; wing area 49,00 sq m
  Empty weight. 1100 kg (2,420 lbs) payload 600 kg (1,320 lbs.);
  Loaded weight 1700 kg (3,740 lbs.).
  Maximum speed 165 km/h (102 m.p.h.); ceiling 4000 m (13,120 ft), range 660 km (410 mis.), endurance 4 h.
  Armament was 1 machine gun and two lance bombs (2 lancia-bombe).
  Two built