Presenting to you, the Project A4 Hydrofoil proposed to the Soviet Navy in 1941.
Translated from a Russian-language site:
"In 1941, Rostislav Evgenievich Alekseev defended his graduation project for the A4 high-speed hydrofoil glider, and the state commission awarded Rostislav Evgenievich the title of shipbuilding engineer. However, the outbreak of the war demanded to rethink the purpose of the ship, on the basis of which he began to stubbornly develop a torpedo fighter boat. Being engaged in this project in his spare time, from 1941 to 1943 Alekseev worked as a control foreman for the production of tanks at the Krasnoye Sormovo plant. However, in 1942, the Naval Shipbuilding Department officially allocated him premises and people to work on the creation of hydrofoil combat boats."
Essentially, this was a modification of his dissertation proposal to become a high-speed torpedo boat. The boat retained the very strange hull shape, which was stated to be powered by a 2000 horsepower engine. The estimated displacement of the ship was only 28 tons, length 45 m, width 3.25 m, crew of about 10 people. The engine was claimed to be capable of propelling the boat to 100 knots, an insane speed for that time.
The main armament, consisting of four 533 mm caliber torpedoes, was located in the middle part of the hull. The torpedoes were dropped through elongated side ports, and they were aimed by turning the entire boat itself. At the top of the craft was a circular turret with a universal 75-mm gun and a built-in optical rangefinder. It is assumed that it had 100 rounds alotted to the gun. Additionally, it was planned to install from one to three multi-barreled DShK machine-gun mounts with 50,000 rounds of ammunition, and a bomb releaser for twelve depth charges was equipped at the stern.
Truly a strange design, such a shame that it never came into fruition - would've been cool to see!
Here is my rendition of the boat:
