+--------------------------------------------+ | Collapsible Canvas Screen (Waterproof) | <--- Raised by Compressed Air +--------------------------------------------+ | | | STANDARD M4 SHERMAN MEDIUM TANK | <--- Duplex Drive System | | +--------------------------------------------+ || || [ Tracks for Land ] [ Twin Propellers for Water ]
When we think of the Allied invasion of Normandy on June 6, 1944, images of storm-troopers rushing onto Omaha Beach under a hail of machine-gun fire often come to mind. We picture the Higgins boats and the air support, but often overlooked is one of the most audacious engineering feats of the war: the DD Tank. dd tank origin
Secrecy was paramount. The canvas screen and propellers were classified “Bigot” (the highest level of D-Day secrecy). Crews were told they were training on “flotation devices” without being shown the full system until one week before the invasion. Many tankers believed they were training for river crossings, not a sea assault. The canvas screen and propellers were classified “Bigot”
However, the development process was not without challenges. The DD Tank had a tendency to capsize, and the flotation screen was prone to damage. Additionally, the tank's weight and size made it difficult to maneuver in the water. However, the development process was not without challenges
The engineering was intricate. The screen had to be waterproof and rigid enough to withstand waves,