The Grigorovich M-5

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The Grigorovich M-5 , was a single-engine double-decker boat of Russian origin. The aircraft was Manufacture by Shchetinin and designed by the ukrainer  "Dmitry Pavlovich Grigorovich" .

The M-5 is based on Grigorovich M-4. Compared to the initial pattern, the lower wing was extended and attached directly to the fuselage. The profile thickness was only 4%. At the end of the lower wing support swimmers were attached. The boat level was reduced to 70 mm in the middle and 140 mm to the edge. Behind the wing, the trunk tapered sharply to form a tailplane. The two-seater aircraft was made in mixed construction (wooden frame / fabric). The engine was first driven by a Gnôme Monosoupape engine of 100 hp, which propelled a thrust propeller. The carburettor was supplied with a pressure line. The fuel tank in the rear fuselage had to be manually overloaded with a manual pump.

The flight tests began in the spring of 1915. It was shown that the M-5 was able to fly with a wave height of up to 0.5 meters and was very easy to fly. Already on April 12, 1915, serial production began, which continued, with many changes in detail on the machine, until 1923. The performance of the M-5 and the serial production started to make it possible to do without foreign flying boats of this performance class. The pilots were sitting side by side. The copilot or observer could, if necessary, mount a 7.62mm Vickers machine gun in a swivel bracket, although the machine serving as a reconnaissance aircraft normally flew unarmed.

With the appearance of the Grigorowitsch M-9 the M-5 migrated into the training, since the maximum speed was no longer sufficient. The flight schools complained about the frequent, necessary repairs of the wooden floor. An improved, especially in the floor area strengthened version, was not delivered for economic reasons.

Attempts to increase the top speed by a performance increase did not lead to any useful result. Grigorowitsch built five test patterns with stronger Rhone engines of 110 hp and 120 hp, as well as a single one with a 130 hp Clerget engine. In order to compensate for the larger engine torque, the angle of attack had to be slightly increased, which meant that the performance increase did not affect the top speed. However, the 130-horsepower Clerget was used in large numbers for the armed reconnaissance aircraft. In addition to the types mentioned, further rotary engines were used, which were often adapted in front workshops.

In all, about 300 copies were produced of this machine, which were used both during the First World War and in the civil war following the October Revolution. In 1918 numerous machines participated in the defense of Baku. Some machines were used until 1925.

Specifications :  
Wingspan : 13.62 m
Length 8,60 m
Wingarea : 37,91 m²
Empty Weight :  660 kg
Max.take-off weight :960 kg
Max speed 105 km/h
Service Ceilling : 3300 m
Range about 350 km
Engine : Gnome Monosoupape with 74 kW (100 hp) or 81 kW 
Clerget with 96 kW 
Armament : Arming a 7.62 mm machine guns 
Crew : 2

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