Dd Tank Origin (UHD)

The tank rolled into the water. For a sickening moment, it listed to the left. The crew inside felt the cold seep through the hull. But then, the canvas billowed out, the air pockets caught, and the tank leveled. The little twin propellers bit into the water. Chugging like a tugboat, the Valentine moved away from the shore.

He began with a Tetrarch light tank. His idea was simple but audacious: make a tank that could swim. Not float like a boat, but propel itself through the sea using its own tracks. The key was displacement. He bolted a rectangular, collapsible canvas screen to the tank's hull, held aloft by rubber tubes. When raised, the screen acted like the sides of a ship, pushing water away and allowing the 7-ton tank to bob just below the surface, with only a small air intake and an exhaust pipe visible. dd tank origin

The problem was beaches. Any invasion of Nazi-occupied Europe would require landing tanks directly onto shore. But landing craft couldn't get close enough without being blown out of the water. Tanks launched too far out simply sank like stones. The tank rolled into the water

The War Office was skeptical. "Swimming tanks?" a general scoffed. "Next you'll want flying horses." But then, the canvas billowed out, the air

On a cold November morning, Straussler stood on the bank of a placid, man-made lake in Surrey. A Valentine tank, its canvas screen raised like the frill of a startled lizard, sat on the concrete ramp. The crew inside—three nervous volunteers—gave a thumbs up.

The first test was a disaster. The canvas ripped. The tank took on water. It sank to the bottom of the Hamble River like a dead beetle.

The rain over the River Thames was a persistent, needle-fine drizzle. In a rented hangar near the Hamble River, a Hungarian-born engineer named Nicholas Straussler watched a canvas screen sag under the weight of collected water. His overalls were stained with grease and river mud. It was 1941, and Britain was losing the war.