Parachute
Overview
A parachute is a device that reduces the speed of descent by using air resistance (drag) to allow an object or person to reach the ground safely. It is primarily used for emergency escape during aircraft accidents, military operations, sports skydiving, and cargo airdrops. Modern parachutes are made of lightweight and strong fabrics such as nylon or silk, and are designed in various shapes and sizes.
Main Content
History
The concept of the parachute first appeared in sketches by Leonardo da Vinci in the 15th century, but the practical parachute was developed in the late 18th century. In 1783, Frenchman Louis-Sébastien Lenormand made the first recorded parachute jump from a tree using an umbrella-shaped device. In 1797, André-Jacques Garnerin successfully landed using a parachute from a hot air balloon. With the development of aircraft in the early 20th century, parachutes became essential equipment in military and civil aviation.
Principle
Parachutes are based on Newton's laws of motion and aerodynamics. When a parachute opens, its large surface area collides with air molecules, generating drag. This drag acts in the opposite direction to gravity, limiting the descent speed. The terminal velocity depends on the size, shape of the parachute, air density, and the weight of the falling object, typically around 5–7 m/s, allowing for a safe landing.
Types
- Round Parachute: A traditional form, mainly used for military and cargo airdrops. It has low maneuverability but is stable.
- Square Parachute (Ram-air): Used for modern skydiving, featuring a wing-shaped airfoil structure for excellent maneuverability and glide performance. Air fills between two layers of fabric to form a rigid wing.
- Drogue Parachute: A small parachute used to slow down high-speed aircraft or spacecraft, aiding in the deployment of the main parachute.
- Brake Parachute: Used to reduce speed during landing, also applied to racing cars and military aircraft.
Components
A parachute system consists of the main parachute, reserve parachute, harness, container, and deployment devices (ripcord, pilot chute). The reserve parachute is used in case of main parachute failure, and an automatic activation device (AAD) automatically deploys it below a certain altitude.
Applications
- Military: Airborne operations, special forces infiltration, cargo airdrops
- Aviation Safety: Aircraft emergency escape (ejection seats)
- Sports: Skydiving, BASE jumping
- Space: Spacecraft recovery (drag chute), Mars rover landing
- Rescue: Mountain rescue, maritime rescue
Safety and Regulations
Parachutes require regular inspection and packing, and users must undergo training and obtain certification. Aviation authorities in each country (e.g., FAA in the US, EASA in Europe) have established strict standards for parachute design, manufacturing, and maintenance.
Latest Trends
As of 2024–2025, parachute technology is focusing on automation and material innovation. Automatic activation devices (AADs) integrate GPS and barometric sensors for more accurate altitude detection and emergency deployment. Additionally, smart parachute systems transmit real-time data to optimize landing points. In the military field, precision-guided parachutes (e.g., JPADS) have been developed to accurately airdrop cargo to target locations. In space exploration, following the success of the Mars helicopter Ingenuity, landing systems combining parachutes and retro-rockets are being researched. Studies on environmentally friendly materials (biodegradable fabrics) and reusable parachutes are also ongoing.
Related Topics
- [[Skydiving]]
- [[Aviation Safety]]
- [[Aerodynamics]]