Pronunciation: [pˈaɹəfˌɔ͡ɪl] (IPA) 
The word parafoil, referring to a type of parachute, is spelled with three syllables: /ˈpærəˌfɔɪl/. The first syllable, "par", is pronounced with a short "a" sound, like in "cat". The second syllable, "a", is pronounced with a schwa sound, like in "uh". The third syllable, "foil", is pronounced with a long "oi" sound, like in "coin". Therefore, the correct pronunciation of parafoil is /ˈpærəˌfɔɪl/.
A parafoil is a type of wing-shaped, aerofoil structure that is commonly used in the field of aerodynamics. Designed to generate lift and provide controlled flight, a parafoil essentially consists of two fabric surfaces connected by a series of ribs or cells. These fabric surfaces are typically made from lightweight, durable materials such as ripstop nylon.
The parafoil's unique design allows it to manipulate airflow and generate lift, similar to the wings of an aircraft. As air flows across the fabric surfaces, it creates a pressure differential, with higher pressure below the parafoil and lower pressure above it. This difference in pressure generates lift, causing the parafoil to rise and remain airborne.
One of the prominent characteristics of parafoils is their ability to be controlled and maneuvered. By strategically altering the angles and positions of the parafoil's airfoil ribs, along with the use of control lines, the pilot can manipulate the shape and geometry of the parafoil, thereby controlling its flight path, speed, and direction.
Parafoils find applications in a wide range of fields, including parachuting, aviation, and aerospace research. They are commonly used in paragliders, kiteboarding, and military operations for their stability and maneuverability. Additionally, parafoils have been utilized in certain scientific missions, such as launching payloads into space, high-altitude research, and atmospheric data collection due to their versatility and controllability.
The word "parafoil" is a combination of two elements: "para" and "foil".
- "Para" comes from the Greek word "pará", which means "beside" or "beyond". It is often used as a prefix in English to signify something alongside or parallel to a specific function or purpose.
- "Foil" is derived from the Old French word "foille", meaning "leaf" or "sheet". In this context, it refers to a surface, usually flat and thin, that provides lift or resistance due to its shape.
When combined, "parafoil" suggests a foil-like structure or device that operates in parallel to a typical foil. In the case of parafoil, it refers to a type of parachute-like wing used in kiteboarding, parachuting, or other recreational activities that allow for controlled flight.
