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Grigorovich M-24
Shchetinin M-24
Dmitri Grigorovich, active during the 20’s in the gas plant No.3 “Red Flyers” in St. Petersburg, where he began the development work on the M-24 Soviet biplane flying boat in April 1922. The design was based on its successful M-9. Some of the differences in the M-24 was dual wings ailerons, and the total area of the hull was changed. The original design used a 220 hp Renault engine, first flying in 1923.

Forty were built that were characterized by poor production quality and multiple problems. However, the absence of better candidates led to their entry into service.
The 1924 M-24bis was an improved development of the Grigorovich M-24 with a slightly higher power modified Renault engine.
Twenty were built at GAZ.3 without the presence of Grigorovich, who by that time had gone to work at GAZ No.1 in Moscow.
Grigorovich M-24
Engine: 1 × Renault V-8, 260 hp (194 kW)
Wingspan: 16.00 m
Wing Area:55,00 m²
Length: 9.00 m
Empty Weight: 1200 kg
Take Off Weight: 1700 kg
Top speed: 140 km / h
Ceiling: 4000 m
Crew: 2 (pilot / observer)
Armament: 1 × 7.62 mm machine gun
Bombload: 100 kg

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