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((Short description|Safety mechanism on some types of parachute))
((Citations missing|date=January 2017))

A '''parachute airlock''', often abbreviated to '''airlock''', is a safety mechanism built into some [[parachute]] models which helps them resist losing their shape while open. It uses a [[Parafoil|ram air]] structure to stiffen each section of the outer edge.

The design was first developed by parachute inventor Brian Germain following a near-fatal ram-air wing collapse in 1994. Germain made a full recovery and went on to personally test many of the airlock [[prototype]] parachutes, often in extreme conditions. Specific parachute designs utilizing the [[Airlock|airlock technology]] include the following: Jedei, Sweptwing, Genesis, Warlock, (AirTimeDesigns.com) Vengeance, (PerformanceDesigns.com) Samurai, Lotus, Sensei R1 (BigAirSportz.com).

While the airlock approach to [[Canopy (parachute)|canopy]] design has generated an enthusiastic user base, the design also has its problems. For example, a [[Parachute|ram-air parachute]] designed with airlocks will not deflate quickly upon landing on a windy day. This may result in dragging a [[Parachuting|parachutist]] across the ground. Parachute packers have also noted that these [[canopy (aircraft)|canopies]] take longer to pack due to the extra time it takes to squeeze the air out. However, proponents of the design prefer the safety advantages of a stable canopy in flight over the convenience of other designs on the ground.<ref>((cite news
 |first=Brian 
 |last=Johnson 
 |title=Airlock 
 |date=1999-11-08 
 |url=http://www.dropzone.com/gear/articles/Airlock.shtml 
 |work=Dropzone.com 
 |accessdate=2007-02-02 
 |url-status=dead 
 |archiveurl=https://web.archive.org/web/20070216003621/http://www.dropzone.com/gear/articles/Airlock.shtml 
 |archivedate=2007-02-16 
))</ref>

==Patent abstract==

=== [[Valve]] apparatus for ram-air wings ===

This invention describes a [[ram-air intake|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 [[Atmospheric pressure|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. ([[Kensington, Maryland]])

'''Appl. No.:''' 08/617,471

'''Filed:''' March 15, 1996<ref>((US Patent|5573207))</ref>

==External links==
* [https://web.archive.org/web/20070101022213/http://www.totalcontrol.com.au/services-select.asp?iServicesID=26 Airlocks:  A discussion of the empirical and theoretical issues relating to valve parachutes. (illustrated)]
* [http://www.performancedesigns.com/docs/Turbulence-Hazard.pdf Turbulence:  The Invisible Hazard]

==References==
((Reflist))

((DEFAULTSORT:Airlock (Parachute)))
[[Category:Parachuting]]


((Air-sports-stub))

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