Archives for November 2022

X-Ray Class Submarine

The Paltus-class submarine is a Russian special purpose mini-submarine of project 1851.1. Two boats were completed – AS-21 and AS-35 as a follow up of the single “X-Ray”-class boat AS-23 (Project 1851). 

X-ray with various gripper options

The surface displacement is approximately 300 tons with a length of 98 feet (30 m). The propulsion comes from nuclear power with the operating depth in excess of 3,800 feet (1,200 m). The designer, according to Polmar was Sergei Bavilin who had designed the earlier diesel electric Project 865/Piranya small submarine of similar dimensions

Continue reading for more renderings and STL files for 3d printing this sub.

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Steam Engine Model

steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be transformed, by a connecting rod and crank, into rotational force for work

I made this model a while back. It was lying around in my hard drives, so i’ve given it a quick update and tidying to be a 3d printable project. Here it is, continue reading for more images and STL files.

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Zeeteyfel Submarine with tank tracks

German engineers were able to create a number of interesting mini-submarine projects. One of them was a kind of crossing a submarine with a tank. This very interesting example was the ultra-small amphibious submarine “Seeteufel” (translated from German as “monkfish”) with a caterpillar mover. This boat was intended both for independent carrying out torpedo attacks and for delivering small groups of swimmers-saboteurs to the target of the attack.


Seeteufel was a rather unusual, even amazing, development. This “pocket” submarine was supposed to feel at home on the water surface, under water, and on land. This combat apparatus, as if descended from the pages of books by the famous science fiction writer Jules Verne. This boat attracted special attention and sympathy from the sabotage detachment “K” specially created in the German fleet. Members of this squad are accustomed to evaluate military equipment from the point of view of its combat use behind the front line of the enemy, so they could not but like this machine.

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Bushnell’s Turtle Submersible

Side view

In 1776, during the American Revolution, inventor David Bushnell decided to take his skills to the next level and build a submarine. And not just any submarine, mind you – this one was specifically designed to attack British ships!

Now, you might be thinking, “But wait, how could a guy in the 18th century possibly build a functional submarine?” Well, let me tell you, Bushnell was no ordinary inventor. He was a genius, a visionary, and a bit of a madman.

Turtle (also called American Turtle) was the world’s first submersible vessel with a documented record of use in combat. It was built in 1775 by American David Bushnell as a means of attaching explosive charges to ships in a harbor, for use against Royal Navy vessels occupying American harbors during the American Revolutionary War. More on Wikipedia.

The submarine he built was called the Turtle, and it was shaped like, you guessed it, a turtle. It was about six feet long and three feet wide, and it had a hatch on top that could be opened and closed by the operator.

Continue reading for more renderings and a free hi rez stl file for a 3d printable display model.

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