Р-1, оснащенный в НИИ ВВС турбонагнетателем "Дженерал электрик"
In 1935 a single M-5-powered R-1 was fitted with a General Electric turbocharger for tests at the V-VS Scientific Research Institute. Although the M-5 was completely obsolete by this time, useful technical and operational information about turbocharging was accrued and the results incorporated into newer aircraft and engines.

Самолёты на фотографии: Aircrafts on the photo: Поликарпов Р-1 - РоссияRussia - 1923

Р-1, изготовленный в Таганроге в 1930г.
A factory-fresh Polikarpov R-1 awaits delivery in 1930 at Factory No 31 at Taganrog on Russia’s south­western border with Ukraine. The type entered service with the Voyenno-Vozdushnye Sily (V-VS - Soviet Air Force) in the summer of 1924. By the end of production some 2,500 examples of the R-1/MR-1 had been built.

Самолёты на фотографии: Aircrafts on the photo: Поликарпов Р-1 - РоссияRussia - 1923

Замена мотора в полевых условиях на Р-1 19-го отряда, Дальний Восток, зима 1928/29 годов
Changing the M-5 engine on an R-1 of the 19th Aviation Detachment in Khabarovsk in December 1928. The R-1 began to be replaced in service by the BMW-powered (or Soviet version thereof) Polikarpov R-5 from 1931, after which the R-1 was relegated to purely training duties.

Самолёты на фотографии: Aircrafts on the photo: Поликарпов Р-1 - РоссияRussia - 1923

В авиационной школе в Кабуле проводят замену двигателя «Либерти» на самолете Р-1
Changing the M-5 on an R-1 in Kabul, Afghanistan, in 1925. The original American Liberty also proved its inbuilt ruggedness, the engine still powering US Army Air Corps types into the mid-1930s.The Liberty’s combination of power and lightness was a quantum leap from the heavy but durable engines that preceded it.

Самолёты на фотографии: Aircrafts on the photo: Поликарпов Р-1 - РоссияRussia - 1923

Передняя часть Р-1 со снятым радиатором
With the radiator removed, the front section of the M-5 on this R-1 is clearly visible. This aircraft was one of many R-1s used for training duties, this example serving with the Borisoglebsk Flying School in the Voronezh region in the summer of 1930.

Самолёты на фотографии: Aircrafts on the photo: Поликарпов Р-1 - РоссияRussia - 1923

Гидросамолет МР-1, построенный на заводе ГАЗ-10 (N 31 ?) в Таганроге.
Soviet Russia’s first mass-produced aircraft, the Polikarpov R-1 was essentially a reverse-engineered Airco D.H.9A powered by a similarly re-engineered copy of the type’s Liberty L-12 engine. This example is a float-equipped MR-1, this variant seeing combat during operations over the Chinese Eastern Railway in 1929.

Самолёты на фотографии: Aircrafts on the photo: Поликарпов МР-1 - РоссияRussia - 1925

The M-5 engine was also fitted to the Tupolev R-3 reconnaissance biplane, built using the new Kolchug construction technique, similar to the corrugated structures used by Junkers. The R-1’s large drag-inducing radiator was replaced on the R-3 with a pair of Lamblin "lobster pot” radiators, one of which is clearly visible here.

Самолёты на фотографии: Aircrafts on the photo: Туполев Р-3 / АНТ-3 - РоссияRussia - 1925

The Grigorovich I-2bis fighter was also powered by the M-5 engine, the type making its first flight in 1925 in the hands of test pilot A.I. Zhukov. The I-2bis was the first Soviet-designed fighter to be put into large-scale production, approximately 210 examples being built during 1925-29.

Самолёты на фотографии: Aircrafts on the photo: Григорович И-2 - РоссияRussia - 1924