**Structural Analysis of Hydrodynamical Interaction of Full-Submerged Archimedes Screws of Rotary-Screw Propulsion Units of Snow and Swamp-Going Amphibious Vehicles with Water Area via Methods of Computer Simulation †**

**Svetlana Karaseva 1,\*, Aleksey Papunin 1, Vladimir Belyakov 1, Vladimir Makarov <sup>1</sup> and Dmitry Malahov <sup>2</sup>**


**Abstract:** The paper considers the problems of estimation and provision of efficiency of rotary-screw propulsion units (RSP) for snow and swamp-going amphibious vehicles. The performance curves of fully submerged Archimedes screws of RSP are presented with parameters typical for snow and swamp-going amphibious vehicles. These parameters were obtained from the results of computer simulation. For a wide range of performance modes, the impact of particular elements of Archimedes screws on the general efficiency of the propulsion unit is analysed. According to the results of analysis of data received, lines of further research will aim to increase the efficiency of RSP when moving afloat.

**Keywords:** rotary-screw propulsion units; amphibious vehicles; Archimedes screws
