Dd Tank Origin Here

His assistant, a young Royal Engineer named Corporal Bill Jenkins, fished him out. "It's a coffin, sir," Jenkins said, shivering.

He went back to the drawing board. He replaced the rubber tubes with a system of thirty-six hollow steel pillars. He used stronger, waterproofed canvas treated with wax and linseed oil. The drive mechanism was refined: the tank's own sprockets would turn a pair of propellers mounted at the rear, disconnected from the tracks.

The design was rushed into production. The "DD"—standing for "Duplex Drive"—was born. But the true test was yet to come. On June 6, 1944, at 5:30 AM, off the coast of Normandy, the sea was brutal. Six-foot swells swallowed small craft whole. Many DD tanks, launched too far from shore in the chaos, were swamped and sunk. At Omaha Beach, nearly all of them were lost.

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. dd tank origin

The War Office was skeptical. "Swimming tanks?" a general scoffed. "Next you'll want flying horses."

It worked.

Nicholas Straussler never saw the landings. He was in a workshop in Berkshire, covered in oil, already sketching a different kind of flotation device for a different kind of war. When the news came, he simply said, "Good. Now, about the problem of mud..." His assistant, a young Royal Engineer named Corporal

But at Sword, Juno, and Gold beaches, the crews remembered Straussler's lesson: Don't fight the sea. Borrow its skin. They launched closer to shore. The canvas screens billowed. The little propellers whirred. And out of the grey, choppy water, the tanks rose like prehistoric beasts crawling onto land.

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 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. He replaced the rubber tubes with a system

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.

They came not as boats, but as ghosts. And behind them, the infantry followed, walking on ground that had, for one terrible morning, become solid again.

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.