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 Fallschirmjager 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 material. The larger cargo parachutes changed the face of airborne warfare. Rather than the vulnerable gliders having to follow the paratroopers into a “hot” DZ, the heavy cargo could now be dropped just minutes ahead of the troopers. This improved the chances of achieving tactical surprise in a drop operation as well as insuring that more of the airborne’s vital equipment and supplies arrived intact. As an added bonus, the new materials, synthetics like nylon and rayon, were also used in the new generation of personnel parachutes, making them much more reliable with a much longer service life. Up to a hundred jumps can be made on a single modern synthetic T-10 parachute, which makes it quite a bargain by current defense standards.
By the 1960s, several new ideas in parachute design were beginning to make themselves known around the world. One of these was to change the shape of the parachute canopy to give it some degree of maneuverability. As mentioned previously, other than the effects of winds, the circular canopy parachutes tend to float down vertically in a fairly straight line. While desirable when dropping large units, this characteristic can become a liability when you want to drop people and things with pinpoint precision on a particular spot or thing. When the British attacked the Pegasus and Orne river bridges on D-Day, they used manned Horsa gliders which could land right on the targets. Fortunately, the Air Force and NASA were looking into the problem of maneuverable parachute systems for applications in recovering satellites and down aircrews. One of the most promising of these was the parafoil, which utilized a rectangular-shaped canopy with tunnels to channel air and provide forward thrust to the chute. By pulling down on various lines attached to the corners, the whole assembly could be maneuvered, with a fair cross-range. Quickly, the military adopted several maneuverable designs, primarily for special operations forces. Unfortunately, steerable personnel parachutes can be highly dangerous during massed unit drops. The problem is that the various jumpers tend to maneuver around, making the chances of a midair collision between troopers a distinct possibility. Thus, other than for Pathfinders and Ranger units, the forces within the 82nd and XVIII Airborne Corps use only circular canopy chutes.
Nevertheless, the steerable parachute is finding a new role as a result of a new concept: precision heavy airdrop. Current heavy airdrop doctrine has the aircraft manually dropping supplies and equipment from as low as 500 feet/152 meters. This makes the transport aircraft sitting ducks, and the loss of any airlifters can have a severe effect on your abilities to conduct follow-on operations. More recently, Air Force C-130s have been taking fire and hits from ground-based defenses while dropping relief supplies in Northern Iraq and Bosnia-Herzegovina. The USAF therefore has a need to be able to drop heavy equipment and supplies from high altitudes, as well as in bad weather and rough terrain. Currently, the Air Force is testing a new kind of heavy drop system, which combines a large steerable parachute with an autonomous autopilot system tied to a NAVSTAR GPS receiver. In this way, all the airdrop crew has to do is to input a desired aimpoint position into the autopilot, then release the parachute with its attached cargo. Once the chute deploys, the GPS system guides it to a pinpoint landing, within just a few yards/meters of the aimpoint. The system is simple and relatively cheap, and will probably come into service within the next few years.
As the paratroops of the United States enter the 21st century, they will do so with the same basic parachute they have used for over a generation. Though improved through four separate design upgrades, the Army’s classic T-10 canopy is still the same basic design that entered service back in 1958. Able to lower
Lightweight Equipment
So far, most of what I have shown you has to do with the
