Before the ASW hydrofoils of the Pr.1141 Sokol (NATO: Babochka) were actually built, they underwent the prolonged research and development process that had its origins as early as 1956 when Zelenodolsk Design Bureau (TsKB-340) begun design works into a new methods of hunting newly-introduced fast submarines. That work research effort was formalized in the joint decision 994-467 of the Central Commitee of the CPSU and Council of Ministers of the USSR declared on 28th of August 1958, about the creation of the complete design of the ASW hydrofoil vessel Pr.1121 by 1960, coupled with test works on the scale model Pr.M1121 Smerch and eventual construction of two full scale ships by 1962.
![[ img ]](https://dl.dropboxusercontent.com/s/ho9zbb3a7c2zf3n/mpk_pr.1121.png)
In 1964 the cancellation of the manufacture of the NK-6 engine planned for these vessels and adaptation of the NK-7 engines led in turn to closure of works on Pr.1121. Instead the works on design project Pr.1141 were initiaded, and by 1967 the early design versions were ready.
![[ img ]](https://dl.dropboxusercontent.com/s/yrxwy35pdz8xs4y/mpk_pr.1141_early_designs_1.png)
Soon thereafter, already in 1967 projects were modified, becoming more similar to final result, although the whole design process continued, and in 1969 at least one more interim design was created.
![[ img ]](https://dl.dropboxusercontent.com/s/qzsqc3y5vsy0cqu/mpk_pr.1141_early_designs_2.png)
Note that there are no information on these vessels' exact length, so it had to be based on approximate calculations.
Well done...
![[ img ]](https://dl.dropboxusercontent.com/s/szqy1u0lnlvb5wc/mrk_pr.1141_uragan.png)
