History of Science and Engineering Annotation << Back Forming a Rational Approach to Selecting a Hydrodynamic Design for Hydrofoil at a new Stage of Their Development Mukhina M.L. A retrospective review of the development and evolution of hydrodynamic hydrofoil designs belonging to the "domestic," "European," and "American" design schools was conducted. Essential information was collected on the key technical and operational characteristics of virtually all passenger hydrofoils built in the USSR, as well as foreign hydrofoils of the "RT" and "RHS" series, and an analysis of "new" hydrofoils was performed. Conclusions were drawn: 1. For the foreseeable future, the tandem hydrofoil design will remain the only alternative in our country, as it has been in the past. Hydrofoils of this type have a simpler, more streamlined design, are relatively lighter in weight, and are simpler and easier to operate than hydrofoils with a "plane" or "duck" design. 2. As is well known, hydrofoils with a tandem design trace their origins to the vessels of G.F. Shortel ("European school") and the vessels of R.E. Alekseev. Essential information has been collected on the key technical and operational characteristics of virtually all passenger hydrofoils built in the USSR, as well as foreign hydrofoils of the RT and RHS series. The vast majority of these are actual vessels that previously performed liner passenger transportation and continue to operate in some regions of our country. It has now become clear that when developing a vessel's hydrodynamic design, the proportion of physical experiments using dynamically similar hydrofoil models can be reduced. The optimal time- and cost-effective approach to resuming hydrofoil construction in Russia is the development of new hydrofoils based on the hydrodynamic designs of such vessels developed and tested by R.E. Alekseev, Doctor of Engineering, State and Lenin Prize laureate, and the Nizhny Novgorod School of High-Speed Shipbuilding Research and Design, which he founded. This paper discusses modeling two hydrodynamic systems using the dynamic similarity theory modeling method, referred to in the article as hydrodynamic copying. Keywords: hydrodynamic hydrofoil design; tandem hydrofoil design with shallow-dive foils; hydrofoil with automatic hydrofoil control system; hydrodynamic copying method. DOI: 10.25791/intstg.12.2025.1589 Pp. 39-55.