By 1929, the TsAGI in Sevastopol researchers began to develop experiments with a view to defining the ideal characteristics of the hulls of ships and aircraft.
Between 1929 and 1930 the engineer NN Podsevalov began to experiment with the different pressures experienced by the hull of a flying boat in the different regimes of navigation; take-off and landing. For this, a series of membranes fixed to dynamometers were installed in different positions at the bottom of the hull of the Grigorovich MUR-1 prototype.
For the continuation of the tests, Grigorovich was asked to build a slightly different hull with a 14º increase in the angle of incidence in the keel area. Built by GAZ No.3 “Krasni Liotchik” from Leningrad, this new flying boat model received the name MUR-2 (Russian: Григорович МУР-2) and was tested in flight, showing characteristics similar to those of the MUR-1. Later it was delivered to the TsAGI for further testing, so this model, of which only one example was built, can be considered purely experimental.
The hydrodynamic tests continued until 1931 allowed the TsAGI to issue the Stiffness Norms for the design of flying boats.
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