06/23/2025. Remarks by Johan Visschedijk: "Designed by Mario Castaldi as a potential successor to the M.7ter, the M.26 single-seat fighter flying boat was completed and tested in 1924. Powered by a 296 hp Hispano-Suiza 42 eight-cylinder liquid-cooled V-engine strut braced above the hull and driving a pusher propeller, the M.26 was of wooden construction and of extremely clean aerodynamic design. Armament consisted of two 0.303 in (7.7 mm) Vickers guns.

Although the M.26 demonstrated an extremely good performance, no production order was forthcoming from the Regia Aeronautica, only two prototypes being completed.

Span: 30 ft 2.2 in (9.20 m)
Length: 26 ft 8.86 in (8.15 m)
Height: 9 ft 10.5 in (3.00 m)
Wing area: 279.86 sq.ft (26.00 sq.m)
Empty weight: 1,907 lb (865 kg)
Loaded weight: 1,195 lb (2,635 kg)
Max speed: 152 mph (244 kmh)
Climb: to 13,123 ft (4,000 m) 12 min 18 sec
Endurance: 2 hr 30 min