flaps are secured with rubber bands and light cords (much like shoestrings). These are designed to break or fall away when the parachute is deployed, and must be replaced prior to each jump. As for the parachute itself, the actual deployment is handled by a long cord (called a static line) attached to the drop aircraft. When the jumpers exit the door of the airplane, they fall a set distance, and then the static line yanks the parachute loose from the bag, starting the deployment cycle. Use of the static line also has the advantage of taking the task of parachute deployment out of the hands of what probably is an overloaded, frightened, and potentially forgetful paratrooper. Should the back-mounted parachute (called the “main”) fail to deploy properly, the jumper can usually make use of a chest-mounted backup chute. The backup parachutes are manually deployed, and represent a second (and final!) chance should the main fail to open properly. By the middle of World War II, most nations deploying paratroopers had such equipment.
There were some differences in the parachutes used by various nations during World War II. For example, the German RZ-16/20 utilized a suspended harness arrangement, which allowed a Fallschirmjäger to fire his weapon while descending, but placed a premium on the athletic skills of the operator to avoid injury during parachute deployment and landing. By contrast, the American T-series chutes were utterly conventional, and have been little changed in today’s T-10 models. For their time, though, the early T-series chutes were fairly reliable, with good sink rates (how fast you lose altitude and hit the ground!) and maximum payloads. However, the use of parachutes to deliver loads like personnel and light cargo containers represented the upper limit of what could be achieved using natural fabrics. This meant that other means had to be developed so that heavy weapons and equipment could be delivered with airborne troops. In fact, the development of cargo gliders was the beginning of what we now call “heavy drop.” This is because higher loads would cause the natural fibers of the day to rip, tear, or break, causing the parachute to fail. Synthetic fibers would have been tougher and thus capable of handling larger loads, but their use was some years off.
The cargo gliders of the Second World War were designed to move personnel and heavier equipment like jeeps, antitank and field guns, and headquarters gear. Early on, the German airborne forces led the world in the development of specialized equipment for delivery of combat gear by air. The Germans started with the small DFS 230, which could carry ten men or a 900-kg/1,984-1b cargo load. Later, they produced the Go 242 medium glider and the huge Me 321, which could carry loads up to a light tank. The British produced similar craft, with their own Horsa medium glider and the big Hamilcar, which could carry a small Locust light tank. American efforts were somewhat more limited than the Germans and British, producing the Waco medium glider, with a similar load to the Horsa. Gliders, however, were dangerous and unreliable. Lightly built, they sometimes would break up while being towed to their landing zones. Even more likely was a dangerous crash upon landing, which could kill the crew and passengers, or destroy the cargo load. But until the development of really large synthetic cargo parachutes in the 1950s, gliders were the only way to land really big loads into a drop zone.
All that changed during the postwar period. Paratroopers were relieved to see the development of larger purpose-designed transport aircraft like the Flying Boxcars, and parachutes large enough to be able to land the largest loads they might need. These large cargo chutes made unmanned delivery of cargo and equipment both possible, and much more reliable than gliders of World War II. The key to the new cargo parachute designs was the use of synthetic fibers as the load-bearing
Mary Wollstonecraft Shelley