Airlock (parachute)
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Airlocks are one-way valves in the leading edge of the wing of a ram-air parachute. Panels of fabric are positioned at an angle to the leading edge of the wing such that air is allows to flow in, but not out. This reduces the rate of depressurization of the airfoil, which enhances safety when flying in turbulent conditions near the ground. [1] This proximity to the ground gives parachutists little time to recover from a collapsed canopy. A canopy collapse near the ground may result in serious injury or death.
While the airlock approach to canopy design has generated an enthusiastic user base, the design also has its problems. For example, a ram-air parachute designed with airlocks will not deflate quickly upon landing on a windy day. This may result in dragging a parachutist across the ground. Parachute packers have also noted that these canopies take longer to pack due to the extra time it takes to squeeze the air out. However, proponents prefer the safety advantages of a stable canopy in flight over inconveniences on the ground. [2]
[edit] Patent abstract
- United States Patent 5,573,207
- Germain November 12, 1996
- Valve apparatus for ram-air wings
This invention describes a ram-air type inflatable wing that is resistant to deflation. The inflatable air wing includes a plurality of cells disposed between the top and bottom skins of the wing, with at least one valve positioned within each of a plurality of cells. Each valve generally inhibits deflation of the cells when the air pressure inside the cells is greater than the air pressure outside the cells and permits the cells to inflate when the air pressure outside the cell is greater than the air pressure inside the cells. Inventors: Germain; Brian S. (Zephyrhills, FL) Appl. No.: 08/617,471 Filed: March 15, 1996
[edit] External links
- Airlocks: A discussion of the empirical and theoretical issues relating to valve parachutes. (illusrated)
- Turbulence: The Invisible Hazard
