Mark 18 Torpedo Blueprint Poster – "Sharon’s Secret Weapon" (unframed, high-resolution print on archival-quality paper, 13 x 9")

Own a piece of WWII history with this highly detailed, vintage-style blueprint poster of the legendary Mark 18 electric torpedo—America’s top-secret underwater weapon that changed naval warfare forever. Ideal for military history buffs, engineers and STEM enthusiasts, World War II collectors, classrooms, workshops, or man caves.

Featuring authentic schematics and meticulously labeled components, this poster highlights the inner workings of the U.S. Navy's first electric torpedo, reverse-engineered from a captured German G7e in 1942. Developed in total secrecy by Westinghouse Electric Corp. in Sharon, Pennsylvania, the Mark 18 was a silent, wakeless powerhouse that helped sink over 400 enemy ships and more than 1 million tons of Japanese shipping during the war. This cross-sectional diagrams of the Mark 18 torpedo, made at Westinghouse in Sharon, Pennsylvania, shows the detailed internal components (labeled), including: warhead, battery compartment, electric motor, propellers, steering gear, various valves and circuits.

Under the historical technical illustration, the title reads: “SHARON’S SECRET WEAPON: THE MAKING OF THE MARK 18 TORPEDO” and the historical description and narrative reads: “In 1942, after the British captured a German G7e torpedo, Westinghouse Electric Corp. in Sharon, Pennsylvania, was secretly tasked with reverse-engineering it for the U.S. Navy. Just 15 weeks later, the first prototypes of the electric Mark 18 torpedo were delivered—silent and wakeless, unlike steam-driven models. Weighing 3,000 pounds and carrying a 600-pound charge, it became one of World War II’s most successful submarine-launched weapons, sinking over 400 enemy ships and about 1 million tons of Japanese shipping. By VJ Day, 10,000 had been produced in the fortified T-1, T-2, and T-3 buildings. The project remained top secret—even within the plant itself—most plant workers never even knew it existed.”