Principle and composition of paraglider flight

The aerodynamic structure of the paraglider is relatively clear. Its parasol has an upper wing surface, a lower wing surface, and dozens of shaped ribs (compartments). The front edge of the canopy has a certain size of air inlet (air vent), while the rear edge is completely closed, so when the pilot runs forward on the hillside, air is poured into the air vent. According to the principle of fluid continuity and Bernoulli s theorem, Due to the different curvatures of the upper and lower wing surfaces, a pressure difference occurs when the air flows through, and the shorter and lower wing surface generates thrust to the longer and upper wing surface. The paraglider is able to take people off the ground by this lifting force. Taking off at ground, the airspeed range during flight is 21-65 km / h.

The umbrella suit is also called the umbrella head, which is divided into air chambers by the upper and lower wing surfaces and the left and right ribs. When the air enters the air chamber from the air outlet, the inner cavity of the umbrella suit is uniformly inflated and maintained under the effect of the air pressure Of rigidity. The different-sized hollows on the ribs allow the air between the air chambers to flow in the span direction to balance the internal pressure of the entire umbrella wing.

Early umbrellas were sewn with colorful, airtight, tear-resistant coated nylon fabrics. Today s paragliders use double-sided coatings coated with polyurethane and silicon. UV-resistant, tear-resistant polyester Polyester fabric sewn.

The weight of the umbrella suit is between 6-8 kg, the wingspan is up to 11-13 meters, the wing area is between 20-30 square meters, and the wing area of ​​the umbrella suit in different sizes and grades ( projection), Number of air cells, aspect ratio (ratio of wingspan length to chord length) and other parameters are different, so the speed, glide ratio, and sink rate of the paraglider are also different, so it depends on the pilot s weight and flight technology, Select the appropriate level and model.

Umbrella rope is a force-transmitting member that connects umbrella clothing and seat belt. Early paragliders often used cotton ropes used in conventional parachutes. In order to reduce deformation and wind resistance and reduce weight, basically small diameters, high strength, Made of bullet- proof fiber material with small deformation. Its inner core is Kevlar fiber or Spectra material, and the outer layer is a polyester fiber sheath. It prevents the ultraviolet radiation from reducing the strength and increasing the abrasion resistance. Dont underestimate this. The thickness of the match stick s umbrella rope can reach more than 40KG.

The umbrella strap is divided into 3 to 4 groups (called groups A, B, C, and D) from the front to the back, which are symmetrically distributed on both sides of the central axis of the umbrella clothing, which sequentially controls the leading edge tuyere and the main center of the umbrella. And the trailing edge and other parts, the end point of the band is connected to the seat belt by a metal insurance main hook. The left and right hand brake ropes can control left and right turns , deceleration, and stop motions, so the pilot can accurately control the flight direction and course in the air. Through the control of the brake rope when landing, the impact on the feet is even gentler than that of descending the steps, and it can reach the sky and descend from the sky.

The pouch is an important part of the pilot s support of the human body during the flight, so that the pilot can fly in a semi-lying or sitting position, maintaining a good perspective and comfort. The high-strength fiberboard in the seat pocket can protect the body from impact, and some are equipped with inflatable seat cushions. The back cushion is equipped with a fixed or movable fiberglass back panel to enhance the protection of the human back and spine. Features. The streamlined seat pocket is designed for off-road racing to reduce air resistance. In addition, the harness system is also provided with a space for a life umbrella and a counterweight water bag (weight).

Parachute is also called para-umbrella. It has a round dome shape, a large sink rate, and a small glide ratio. It is mainly responsible for lifesaving. The auxiliary umbrella handle is designed to be reachable by the pilot s hand. When the main umbrella cannot be recovered in case of unrecoverable conditions, the auxiliary umbrella can be thrown to land. In order to obtain maximum traction and slow down the sinking speed, the main umbrella should be recovered as soon as possible after the auxiliary umbrella is thrown so that the auxiliary umbrella can be raised directly above the pilot. The secondary umbrella is usually folded in a seat bag, and even if it is not used, it must be repacked every 3-6 months to prevent adhesion and affect the performance and speed of opening the umbrella.

The front parachute bag is designed as a platform where various flight instruments such as altimeters, walkie-talkies, GPS (Global Positioning System for navigation), compass, flight computer, etc. can be provided to provide flight data, allowing pilots to During the flight, you can see the airspace, altitude, speed, and direction at a glance, and can maintain mutual contact with teammates and ground personnel at any time.

In order to meet the needs of flight and ensure safety, you should also carry a life umbrella and personal protective equipment, such as Helmets, a professional helmet with excellent seismic performance, flight suits that reduce wind resistance and keep warm and moisture, professional umbrella boots with ankle and anti-slip, gloves And goggles.

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