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Parachutes opening

Drogue parachutes are used to aid horizontal deceleration of a vehicle (a fixed-wing aircraft, or a drag racer), or to provide stability (tandem free-fall, or space shuttle after touchdown).

The word "parachute" comes from "para", meaning "against" or "counter" in Ancient Greek, and "chute", the French word for "fall". Some modern parachutes are classified as semi-rigid wings, which are maneuverable and can make a controlled descent to break on impact with the ground.

Contents

History

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Early Renaissance Forms

The oldest known depiction of a parachute, by an anonymous author (Italy, 1470s)

The earliest evidence for the parachute dates back to the Renaissance period.[1] The oldest parachute design appears in an anonymous manuscript from 1470s Renaissance Italy (British Museum Add. MSS 34,113, fol. 200v), showing a free-hanging man clutching a cross bar frame attached to a conical canopy.[2] As a safety measure, four straps run from the ends of the rods to a waist belt. The design is a marked improvement over another folio (189v) which depicts a man trying to break the force of his fall by the means of two long cloth streamers fastened to two bars which he grips with his hands.[3] Although the surface area of the parachute design appears to be too small to offer effective resistance to the friction of the air and the wooden base-frame is superfluous and potentially harming, the revolutionary character of the new concept is obvious.[3]

Veranzio's 1595 parachute design titled "Flying Man"

Only slightly later, a more sophisticated parachute was sketched by the polymath Leonardo da Vinci in his Codex Atlanticus (fol. 381v) dated to ca. 1485.[2] Here, the scale of the parachute is in a more favorable proportion to the weight of the jumper. Leonardo's canopy was held open by a square wooden frame, which alters the shape of the parachute from conical to pyramidal.[3] It is not known whether the Italian inventor was influenced by the earlier design, but he may have learnt about the idea through the intensive oral communication among artist-engineers of the time.[4] The feasibility of Leonardo's pyramidal design was successfully tested in 2000 by the British Adrian Nicholas and again in 2008 by another skydiver.[5] According to the historian of technology Lynn White, these conical and pyramidal designs, much more elaborate than early artistic jumps with rigid parasols in Asia, mark the origin of "the parachute as we know it".[1]

The Venetian inventor Veranzio (1551–1617) examined da Vinci's parachute sketch, and set out to implement one of his own. He kept the square frame, but replaced the canopy with a bulging sail-like piece of cloth which he came to realize decelerates the fall more effectively.[3] A now-famous depiction of a parachute that he dubbed Homo Volans (Flying Man) appeared in his book on mechanics, Machinae Novae (1595), alongside a number of other devices and technical concepts. In 1617, Veranzio implemented his design and tested the parachute by jumping from a tower in Venice. The event was documented some thirty years later by John Wilkins, founder and secretary of the Royal Society in London.[6]

Modern parachutes

Louis-Sébastien Lenormand jumps from the tower of the Montpellier observatory, 1783. Illustration from the late 19th Century.

The modern parachute was invented in the late 18th century by Louis-Sébastien Lenormand in France, who made the first recorded public jump in 1783. Lenormand also sketched it beforehand. Two years later, Jean-Pierre Blanchard demonstrated it as a means of safely disembarking from a hot air balloon. While Blanchard's first parachute demonstrations were conducted with a dog as the passenger, he later had the opportunity to try it himself in 1793 when his hot air balloon ruptured and he used a parachute to escape.

First use of a frameless parachute, by André Garnerin in 1797
Schematic depiction of Garnerin's parachute, from an early nineteenth century illustration.

Subsequent development of the parachute focused on it becoming more compact. While the early parachutes were made of linen stretched over a wooden frame, in the late 1790s, Blanchard began making parachutes from folded silk, taking advantage of silk's strength and light weight. In 1797, André Garnerin made the first jump using such a parachute. Garnerin also invented the vented parachute, which improved the stability of the fall. In 1911, Gleb Kotelnikov invented the first knapsack parachute, later popularized by Paul Letteman and Käthe Paulus.

At San Francisco in 1885, Thomas Scott Baldwin was the first person in the United States to descend from a balloon in a parachute. In 1911 Grant Morton made the first parachute jump from an airplane, in a Wright Model B, at Venice Beach, California. The pilot of the plane was Phil Parmalee. Morton's parachute was of the 'throw-out' type whereas he held the chute in his arms as he left the aircraft. On 1 March 1912, US Army Captain Albert Berry made the first parachute jump from a moving aircraft over Missouri using a 'pack' style chute. This is the style of chute that became en reg with the actual chute being stored or housed in a casing on the jumper's body. Štefan Banič from Slovakia invented the first actively used parachute, patenting it in 1913[citation needed]. On 21 June 1913 Georgia Broadwick became the first woman to parachute jump from a moving aircraft, doing so over Los Angeles[citation needed].

The first military use for the parachute was for use by artillery spotters on tethered observation balloons in World War I[citation needed]. These were tempting targets for enemy fighter aircraft, though difficult to destroy, due to their heavy antiaircraft defenses. Because they were difficult to escape from, and dangerous when on fire due to their hydrogen inflation, observers would abandon them and descend by parachute as soon as enemy aircraft were seen. The ground crew would then attempt to retrieve and deflate the balloon as quickly as possible. No parachutes were issued to Allied "heavier-than-air" aircrew. [7] As a result, the pilot of a disabled plane only had three options, to ride his machine into the ground, jump from several thousand feet, or commit suicide using a standard-issued revolver. In the UK, Everard Calthrop, a railway engineer, and breeder of Arab horses, invented and marketed through his Aerial Patents Company a "British Parachute". Thomas Orde-Lees, known as the Mad Major, demonstrated that parachutes could be used successfully from a low height (he jumped from Tower Bridge in London) which led to their being used by the Royal Flying Corps.

The German air service, in 1919, became the world's first to introduce a standard parachute and the only one at the time. Despite Germany issuing their pilots with parachutes, their efficiency was relatively poor. As a result, many pilots died whilst using them, including aces such as Oberleutnant Erich Lowenhardt (who fell from 12,000 feet (3,700 m) after being accidentally rammed by another German aircraft) and Fritz Rumey who tested it in 1918, only to have it fail at a little over 3,000 ft.

Tethered parachutes were initially tried but caused problems when the aircraft was spinning. In 1919 Leslie Irvin invented and successfully tested a parachute that the pilot could deploy when clear of the aircraft. He became the first person to make a premeditated free-fall parachute jump from an airplane.[8]

An early brochure of the Irvin Air Chute Company credits William O'Connor 24 August 1920 at McCook Field near Dayton, Ohio as the first person to be saved by an Irvin parachute.[9] Another life-saving jump was made at McCook Field by test pilot Lt. Harold H. Harris on 20 October 1922. Shortly after Harris' jump two Dayton newspaper reporters suggested the creation of the Caterpillar Club for successful parachute jumps from disabled aircraft. Beginning with Italy in 1927, several countries experimented with using parachutes to drop soldiers behind enemy lines, and by World War II large airborne forces were trained and used in surprise attacks, as in the 1941 Battle of Crete. Aircraft crew were routinely equipped with parachutes for emergencies as well[citation needed]

Types of parachutes

Round types

An American paratrooper using an MC1-1C series 'round' parachute

Round parachutes are purely drag devices (that is, unlike the ram-air types, they provide no lift) and are used in military, emergency and cargo applications. These have large dome-shaped canopies made from a single layer of triangular cloth gores. Some skydivers call them "jellyfish 'chutes" because of the resemblance. Modern sports parachutists rarely use this type.

The first round parachutes were simple, flat circulars. These early parachutes suffered from instability caused by oscillations. A hole in the apex helped to vent some air and reduce the oscillations. Many military applications adopted conical (i.e. cone-shaped) or parabolic (a flat circular canopy with an extended skirt) shapes, such as the US Army T-10 static-line parachute. A round parachute with no holes in it is more prone to oscillate, and is not considered to be steerable.

A small (3-8 mph) forward speed and steering can be achieve be cuts in various sections (gores) across the back, or by cutting 4 lines in the back thereby modifying the canopy to allow air to escape from the back of the canopy, providing limited forward speed. Modifications can skirt bow out. Turning is accomplished by deforming the edges of the modifications, giving the parachute more speed from one side of the modification than the other. This gives the jumpers the ability to steer the parachute, enabling them to avoid obstacles and to turn into the wind to minimize horizontal speed at landing.

Cruciform (square) types

The weird design characteristics of cruciform parachutes increases oscillations (its user swinging back and forth) and violent turns during descent. This technology will be used by the US Army as it replaces its current T-10 parachutes under a program called ATPS (Advanced Tactical Parachute System). The ATPS canopy is a highly modified version of a cross/ cruciform platform and is square in appearance. The ATPS (T-11) system will reduce the rate of descent by 30 percent from 21 feet per second (6.4 m/s) to 15.75 feet per second (4.80 m/s). The T-11 is designed to have an average rate of descent 14% slower than the T-10D thus resulting in lower landing injury rates for jumpers. The decline in rate of descent will reduce the impact energy by almost 25% to lessen the potential for injury.

Boeing B-47B-40BW of the 306th Bomb Wing (Medium) at MacDill AFB, Florida, landing with drag chute
RAF Typhoon using a parachute for braking after landing

Annular and pull-down apex types

A variation on the round parachute is the pull down apex parachute. Invented by a Frenchman named Pierre-Marcel Lemoigne[10][11][12][citation needed], it is referred to as a Para-Commander canopy in some circles, after the first model of the type. It is a round parachute, but with suspension lines to the canopy apex that applies load there and pulls the apex closer to the load, distorting the round shape into a somewhat flattened or lenticular shape.

Some designs have the fabric removed from the apex to open a hole through which air can exit, giving the canopy an annular geometry. They also have decreased horizontal drag due to their flatter shape and, when combined with rear-facing vents, can have considerable forward speed.

Rogallo wing and other types

Sport parachuting has experimented with the Rogallo wing, among other shapes and forms. These were nearly always an attempt to increase the forward speed and reduce the landing speed offered by the other options at the time. The ram-air parachute's development and the subsequent introduction of the sail slider to slow deployment reduced the level of experimentation in the sport parachuting community.The parachutes are also hard to build

Ribbon and ring types

Ribbon and ring parachutes have similarities to annular designs. They are frequently designed to deploy at supersonic speeds. A conventional parachute would instantly burst upon opening at such speeds. Ribbon parachutes have a ring-shaped canopy, often with a large hole in the center to release the pressure. Sometimes the ring is broken into ribbons connected by ropes to leak air even more. These large leaks lower the stress on the parachute so it does not burst or shred when it opens. Ribbon parachutes made of kevlar are used on nuclear bombs such as the B61 and B83.

Ram-air types

Most modern parachutes are self-inflating "ram-air" airfoils known as a parafoil that provide control of speed and direction similar to paragliders. Paragliders have much greater lift and range, but parachutes are designed to handle, spread and mitigate the stresses of deployment at terminal velocity. All ram-air parafoils have two layers of fabric; top and bottom, connected by airfoil-shaped fabric ribs to form "cells." The cells fill with high pressure air from vents that face forward on the leading edge of the airfoil. The fabric is shaped and the parachute lines trimmed under load such that the ballooning fabric inflates into an airfoil shape. This airfoil is sometimes maintained by use of fabric one-way valves called Airlocks.

Personal parachutes

A U.S. Navy display jumper landing a 'square' ram-air parachute

Deployment

Reserve parachutes usually have a ripcord deployment system, which was first designed by Theodore Moscicki, but most modern main parachutes used by sports parachutists use a form of hand-deployed pilot chute. A ripcord system pulls a closing pin (sometimes multiple pins), which releases a spring-loaded pilot chute, and opens the container; the pilot chute is then propelled into the air stream by its spring, then uses the force generated by passing air to extract a deployment bag containing the parachute canopy, to which it is attached via a bridle. A hand-deployed pilot chute, once thrown into the air stream, pulls a closing pin on the pilot chute bridle to open the container, then the same force extracts the deployment bag. There are variations on hand-deployed pilot chutes, but the system described is the more common throw-out system.

Only the hand-deployed pilot chute may be collapsed automatically after deployment—by a kill line reducing the in-flight drag of the pilot chute on the main canopy. Reserves, on the other hand, do not retain their pilot chutes after deployment. The reserve deployment bag and pilot chute are not connected to the canopy in a reserve system. This is known as a free-bag configuration, and the components are often lost during a reserve deployment.

Occasionally, a pilot chute does not generate enough force either to pull the pin or to extract the bag. Causes may be that the pilot chute is caught in the turbulent wake of the jumper (the "burble"), the closing loop holding the pin is too tight, or the pilot chute is generating insufficient force. This effect is known as "pilot chute hesitation," and, if it does not clear, it can lead to a total malfunction, requiring reserve deployment.

Paratroopers' main parachutes are usually deployed by static lines that release the parachute, yet retain the deployment bag that contains the parachute—without relying on a pilot chute for deployment. In this configuration the deployment bag is known as a direct-bag system, in which the deployment is rapid, consistent, and reliable. This kind of deployment is also used by student skydivers going through a static line progression, a kind of student program.

Varieties of personal ram-airs

Personal ram-air parachutes are loosely divided into two varieties: rectangular or tapered, commonly referred to as "squares" or "ellipticals" respectively. Medium-performance canopies (reserve-, BASE-, canopy formation-, and accuracy-type) are usually rectangular. High-performance, ram-air parachutes have a slightly tapered shape to their leading and/or trailing edges when viewed in plan form, and are known as ellipticals. Sometimes all the taper is in the leading edge (front), and sometimes in the trailing edge (tail).

Ellipticals are usually used only by sports parachutists. Ellipticals often have smaller, more numerous fabric cells and are shallower in profile. Their canopies can be anywhere from slightly elliptical to highly elliptical—indicating the amount of taper in the canopy design, which is often an indicator of the responsiveness of the canopy to control input for a given wing loading, and of the level of experience required to pilot the canopy safely.

The rectangular parachute designs tend to look like square, inflatable air mattresses with open front ends. They are generally safer to operate because they are less prone to dive rapidly with relatively small control inputs, they are usually flown with lower wing loadings per square foot of area, and they glide more slowly. They typically have a less-efficient glide ratio.

Wing loading of parachutes is measured similarly to that of aircraft: comparing the number of pounds (exit weight) to square footage of parachute fabric. Typical wing loadings for students, accuracy competitors, and BASE jumpers are less than one pound per square foot—often 0.7 pounds per square foot or less. Most student skydivers fly with wing loadings below one pound per square foot. Most sport jumpers fly with wing loadings between 1.0 and 1.4 pounds per square foot, but many interested in performance landings exceed this wing loading. Professional Canopy pilots compete at wing loadings of 2 to 2.6 pounds per square foot. While ram-air parachutes with wing loadings higher than four pounds per square foot have been landed, this is strictly the realm of professional test jumpers.

Smaller parachutes tend to fly faster for the same load, and ellipticals respond faster to control input. Therefore, small, elliptical designs are often chosen by experienced canopy pilots for the thrilling flying they provide. Flying a fast elliptical requires much more skill and experience. Fast ellipticals are also considerably more dangerous to land. With high-performance elliptical canopies, nuisance malfunctions can be much more serious than with a square design, and may quickly escalate into emergencies. Flying highly loaded, elliptical canopies is a major contributing factor in many skydiving accidents, although advanced training programs are helping to reduce this danger.

High-speed, cross-braced parachutes such as the Velocity, VX, XAOS and Sensei have given birth to a new branch of sport parachuting called "swooping." A race course is set up in the landing area for expert pilots to measure the distance they are able to fly past the 6-foot (1.8 m) tall entry gate. Current world records exceed 600 feet (180 m).

Aspect ratio is another way to measure ram-air parachutes. Aspect ratios of parachutes are measured the same way as aircraft wings, by comparing span with chord. Low aspect ratio parachutes (i.e. span 1.8 times the chord) are now limited to precision landing competitions. Popular precision landing parachutes include Jalbert (now NAA) Para-Foils and John Eiff's series of Challenger Classics. While low aspect ratio parachutes tend to be extremely stable—with gentle stall characteristics—they suffer from steep glide ratios and small "sweet spots" for timing the landing flare.

Medium aspect ratio (i.e. 2.1) parachutes are widely used for reserves, BASE, and canopy formation competition because of their predictable opening characteristics. Most medium aspect ratio parachutes have seven cells.

High aspect ratio parachutes have the flattest glide and the largest "sweet spots" (for timing the landing flare) but the least predictable openings. An aspect ratio of 2.7 is about the upper limit for parachutes. High aspect ratio canopies typically have nine or more cells. All reserve ram-air parachutes are of the square variety, because of the greater reliability, and the less-demanding handling characteristics.

General characteristics of ram-airs

Main parachutes used by skydivers today are designed to open softly. Overly rapid deployment was an early problem with ram-air designs. The primary innovation that slows the deployment of a ram-air canopy is the slider; a small rectangular piece of fabric with a grommet near each corner. Four collections of lines go through the grommets to the risers. During deployment, the slider slides down from the canopy to just above the risers. The slider is slowed by air resistance as it descends and reduces the rate at which the lines can spread. This reduces the speed at which the canopy can open and inflate.

At the same time, the overall design of a parachute still has a significant influence on the deployment speed. Modern sport parachutes' deployment speeds vary considerably. Most modern parachutes open comfortably, but individual skydivers may prefer harsher deployment.

The deployment process is inherently chaotic. Rapid deployments can still occur even with well-behaved canopies. On rare occasions deployment can even be so rapid that the jumper suffers bruising, injury, or death.


Changes in slider design can impact the speed with which the parachute opens. Sliders can be made larger or have pockets installed to reduce the opening speed (making it softer) by increasing the amount of fabric providing air resistance. They can also be used to increase the opening speed (making it faster), as is desirable for reserve canopies and BASE canopies. Reducing the amount of fabric decreases the air resistance. This can be done by making the slider smaller, inserting a mesh panel, or cutting a hole in the slider.

Safety

A parachute is carefully folded, or "packed" to ensure that it will open reliably. If a parachute is not packed properly it can result in death because the main parachute might fail to deploy correctly or fully. In the U.S. and many developed countries, emergency and reserve parachutes are packed by "riggers" who must be trained and certified according to legal standards. Sport skydivers are always trained to pack their own primary "main" parachutes.

Parachutes can malfunction in several ways. Malfunctions can range from minor problems that can be corrected in-flight and still be landed, to catastrophic malfunctions that require the main parachute to be cut away using a modern 3-ring release system, and the reserve be deployed. Most skydivers also equip themselves with small barometric computers (known as an AAD or automatic activation device like Cypres, FXC or Vigil) that will automatically activate the reserve parachute if the skydiver himself has not deployed a parachute to reduce his rate of descent by a preset altitude.

Exact numbers are difficult to estimate, but approximately one in a thousand sports main parachute openings malfunction, and must be cut away, although some skydivers have many hundreds of jumps and never cut away. Reserve parachutes are packed and deployed differently. They are also designed more conservatively, and are built and tested to more exacting standards, making them more reliable than main parachutes. However, the primary safety advantage of a reserve chute comes from the probability of an unlikely main malfunction being multiplied by the even less likely probability of a reserve malfunction. This yields an even smaller probability of a double malfunction, although the possibility of a main malfunction that cannot be cut away causing a reserve malfunction is a very real risk. In the U.S., the average fatality rate is considered to be about 1 in 80,000 jumps. Most injuries and fatalities in sport skydiving occur under a fully functional main parachute because the skydiver made an error in judgment while flying the canopy—resulting in high-speed impact with the ground, impact with a hazard on the ground that might otherwise have been avoided, or collision with another skydiver under canopy.[citation needed]

Parachute malfunctions

The Apollo 15 capsule landed safely despite a parachute failure.

Below are listed malfunctions specific to round-parachutes. For malfunctions specific to square parachutes, see Malfunction (parachuting).

  • A "Mae West" is a type of round parachute malfunction which contorts the shape of the canopy into the appearance of a brassiere, presumably one suitable for a woman of Mae West's proportions. [3]
  • "Squidding" occurs when a parachute fails to inflate properly and its sides are forced inside the canopy. This kind of malfunction occurred during parachute testing for the Mars Exploration Rover. [4]
  • A "cigarette roll" occurs when a parachute deploys fully from the bag but fails to open. The parachute then appears as a vertical column of cloth (in the general shape of a cigarette), providing the jumper with very little drag. It is caused when one skirt of the canopy, instead of expanding outward, is blown against the opposite skirt. The column of nylon fabric, buffeted by the wind, rapidly heats from the friction of the nylon rubbing against nylon and can melt the fabric and fuse it together, preventing any hope of the canopy opening.
  • An "inversion" occurs when one skirt of the canopy blows between the suspension lines on the opposite side of the parachute and then catches air. That portion then forms a secondary lobe with the canopy inverted. The secondary lobe grows until the canopy turns completely inside out.

Records

On 16 August 1960 Joseph Kittinger, in the Excelsior III test jump, set the current world record for the highest parachute jump. He jumped from a balloon at altitude of 101,516 feet (30,942 m) (which was also a manned balloon altitude record at the time). A small stabilizer chute deployed successfully and Kittinger fell for 4 minutes and 36 seconds,[13], also setting a still-standing world record for the longest parachute free-fall, if falling with a stabilizer chute is counted as free-fall. At an altitude of 17,500 feet (5,300 m), Kittinger opened his main chute and landed safely in the New Mexico desert. The whole descent took 13 minutes and 45 seconds[14]. During the descent, Kittinger experienced temperatures as low as −94 °F (−70 °C). In the free-fall stage, he reached a top speed of 614 mph (988 km/h or 274 m/s).[15]

According to the Guinness book of records, Eugene Andreev (USSR) holds the official FAI record for the longest free-fall parachute jump (without drogue chute) after falling for 80,380 ft (24,500 m) from an altitude of 83,523 ft (25,457 m) near the city of Saratov, Russia on 1 November 1962.

References

  1. ^ a b White, Lynn (1968), "The Invention of the Parachute", Technology and Culture 9 (3): 462–467 (466) 
  2. ^ a b White, Lynn (1968), "The Invention of the Parachute", Technology and Culture 9 (3): 462–467 (462f.) 
  3. ^ a b c d White, Lynn (1968), "The Invention of the Parachute", Technology and Culture 9 (3): 462–467 (465) 
  4. ^ White, Lynn (1968), "The Invention of the Parachute", Technology and Culture 9 (3): 462–467 (465f.) 
  5. ^ BBC: Da Vinci's Parachute Flies (2000); FoxNews: Swiss Man Safely Uses Leonardo da Vinci Parachute (2008)
  6. ^ John Wilkins (1614 - 1672): Mathematical Magic of the Wonders that may be Performed by Mechanical Geometry, part I: Concerning Mechanical Powers Motion, part II, Deadloss or Mechanical Motions, published in London in 1648.
  7. ^ Lee, Arthur Gould (1968). No parachute. London: Jarrolds. ISBN 0090865901. 
  8. ^ [1]
  9. ^ [2]
  10. ^ Pierre Marcel Lemoigne, U.S. patent no. 3,228,636 (filed: 7 November 1963; issued: 11 January 1966). Available on-line at: http://www.google.com/patents?id=XcxVAAAAEBAJ&pg=PA1&zoom=4&ie=ISO-8859-1&output=html .
  11. ^ French Web site on recent work on parachutes (in French): http://jmp-pan.blogspot.com/2008/02/historique-du-parachutisme-ascensionnel_988.html . Includes photo of Mr. Lemoigne.
  12. ^ See also: Theodor W. Knacke, "Technical-historical development of parachutes and their applications since World War I (Technical paper A87-13776 03-03)," 9th Aerodynamic Decelerator and Balloon Technology Conference (Albequerque, New Mexico; 7-9 October 1986) (N.Y., N.Y.: American Institute of Aeronautics and Astronautics, 1986), pages 1-10.
  13. ^ Jeffrey S. Hampton (2003-12-15). "'Hero of Aviation' speaks about record-setting free fall". The Virginian-Pilot: p. Y1. 
  14. ^ Tim Friend (1998-08-18). "Out of thin air His free fall from 20 miles (32 km) put NASA on firm footing". USA Today: p. 1D. 
  15. ^ Data of the stratospheric balloon launched on 8/16/1960 For EXCELSIOR III

External links

See also


1911 encyclopedia

Up to date as of January 14, 2010

From LoveToKnow 1911

PARACHUTE (from Ital. parare, to shield, protect; cf. "parasol," "parapet," and Fr. chute, a fall), an instrument more or less resembling,a large umbrella, which by the resistance it offers to the air enables an aeronaut attached to it to descend safely from a balloon or flying machine in the air. The principle of the parachute is so simple that the idea must have occurred to persons in all ages. Simon de la Loubere (1642-1729), in his History of Siam (Paris, 1691), tells of a person who frequently diverted the court by the prodigious leaps he used to take, having two parachutes or umbrellas fastened to his girdle. In 1783 Sebastien Lenormand practically demonstrated the efficiency of a parachute by descending from the tower of Montpellier observatory; but he merely regarded it as a useful means whereby to escape from fire. To J. P. Blanchard (1753-1809) is due the idea of using it as an adjunct to the balloon. As early as 1785 he had constructed a parachute to which was attached a basket. In this he placed a dog, which descended safely to the ground when the parachute was released from a balloon at a considerable elevation. It is stated that he descended himself from a balloon in a parachute in 1793; but, owing to some defect in its construction he fell too rapidly, and broke his leg. Andre Jacques Garnerin (1769-1823) was the first person who successfully descended from a balloon in a parachute, and he repeated this experiment so often that he may be said to have first demonstrated the practicability of using the machine, though his elder brother, J. B. O. Garnerin (1766-1849), also claimed a share in the merit of perfecting it. In 1793 he was taken prisoner at Marchiennes, and while in captivity at Bude (Budapest) thought out the means of descending from a balloon by means of a parachute. His first public experiment was made on the 22nd of October 1797. He ascended from the park of Monceau, at Paris, and at the height of about 14 m. he released the parachute, which was attached to the balloon in place of a car; the balloon, relieved suddenly of so great a weight, rose very rapidly till it burst, while the parachute descended very fast, making violent oscillations all the way. Garnerin, however, reached the earth in safety. He repeated his parachute experiment in England on the 21st of September 1802. The parachute was dome-shaped, and bore a resemblance to a large umbrella (fig. 1). The case or dome was made of white canvas, and was 23 ft. in diameter. At the top was a truck or round piece of wood 10 in. in diameter, with a hole in its centre, fastened to the canvas by 32 short pieces of tape. The parachute was suspended from a hoop attached to the netting of the balloon, and below it was placed a FIG. I. - Parachute (Garnerin type). cylindrical basket, 4 ft. high and 24 ft. in diameter, which contained the aeronaut. The ascent took place at about six o'clock from North Audley Street, London; and at a height of about (it is believed) 8000 ft. Garnerin separated the parachute from the balloon. For a few seconds his fate seemed certain, as the parachute retained the collapsed state in which it had originally ascended and fell very rapidly. It suddenly, however, expanded, and the rapidity of its descent was at once checked, though oscillations were so violent that the car, which was suspended 20 ft. below, was sometimes on a level with the rest of the apparatus. Some accounts state that these oscillations increased, others that they decreased as the parachute descended; the latter seems the more probable. It came to the ground in a field at the back of St Pancras Church, the descent having occupied rather more than ten minutes. Garnerin was hurt a little by the violence with which the basket containing him struck the earth; but a few cuts and a slight nausea represented all the ill effects of his fall. A few years later, Jordaki Kuparento, a Polish aeronaut, made real use of a parachute. He ascended from Warsaw on the 24th of July 1 808, in a fire-balloon, which, at a considerable elevation, took fire; but he was able to effect his descent in safety by means of his parachute.

The next experiment made with a parachute resulted in the death of Robert Cocking, who as early as 1814 had become interested in the subject. The great defect of Garnerin's umbrella-shaped parachute had been its violent oscillation during descent, and Cocking considered that if the parachute were made of a conical form (vertex downwards) the whole of this oscillation would be avoided; and if it were made of sufficient size there would be resistance enough to check too rapid a descent. He therefore constructed a parachute on this principle (fig.2), the radius of which at its widest part was about 17 ft. It was stated in the public announcements previous to the experiment that the whole weighed 223 lb; but from the evidence at the inquest it appeared that the weight must have been over 400 lb exclusive of Cocking's weight,which was 177 lb. On the 24th of July 1837, the Nassau balloon, with Charles Green, the aeronaut, and Edward Spencer, a solicihaving suspended below it the parachute, in the car of which was Cocking, rose from Vauxhall Gardens, London, at twenty-five minutes to eight in the evening. A good deal of difficulty was experienced in rising to a suitable height, partly in consequence of the resistance to the air offered by the expanded parachute, and partly owing to its weight. Cocking wished the height to be 8000 ft.; but when the balloon reached the height of 5000 ft., nearly over Greenwich, Green called out to Cocking that he should be unable to ascend to the requisite height if the parachute was to descend in daylight. Cocking accordingly let slip the catch which was to liberate him from the balloon. The parachute for a few seconds descended very rapidly, but still evenly, until suddenly the upper rim seemed to give way and the whole apparatus collapsed (taking a form resembling an umbrella turned inside out, and nearly closed), and the machine descended with great rapidity, oscillating very much. When about 200 or 300 ft. from the ground the basket became disengaged from the remnant of the parachute, and Cocking was found in a field at Lee, literally dashed to pieces.

Many objections were made to the form of Cocking's parachute; but there is little doubt that had it been constructed of sufficient strength, and perhaps of somewhat larger size, it would have answered its purpose. John Wise (1808-1879), the American aeronaut, made some experiments on parachutes of both forms (Garnerin's and Cocking's), and found that the latter always were much more steady, descending generally in a spiral curve.

A descending balloon half-full of gas either does rise, or can with a little management be made to rise, to the top of the netting and take the form of a parachute, thus materially lessening the rapidity of descent. Wise, in fact, having noticed this, once purposely exploded his balloon when at a considerable altitude, and the resistance offered to the air by the envelope of the balloon was sufficient to enable him to reach the ground without injury. In more recent times the use of the parachute has become fairly common, but a good many serious accidents have occurred.


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Gaming

Up to date as of February 01, 2010

From Wikia Gaming, your source for walkthroughs, games, guides, and more!

Contents

Description

The player can use a parachute as a means of transport.

Optional effects

  • The parachute is retractable.
  • The parachute can be deployed from atop a fast moving object, such as a vehicle.

Uses

  • In the 1997 game MDK [1], the main character can use a retractable parachute made of ribbons.
  • In the 2006 game Just Cause and its 2010 successor Just Cause 2, the parachute is an important means of transport. In Just Cause, it can be indefinitely reused, even opened and closed (retracted) multiple times while in the air. It can not only be deployed while in the air but also from atop a fast moving vehicle, such as a car, ship or plane, or when using a grappling hook on a vehicle.

Realism

To date, retractable parachutes have only been used on vehicles. No parachute is known that is intended for use on a human and can be automatically retracted while in the air.


This article uses material from the "Parachute" article on the Gaming wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.

Simple English

See also: Parachute (disambiguation)
File:Ram air
Someone landing with a modern parachute

A parachute is usually an umbrella shaped device on which people or things can float slowly and safely down to the ground from a great height, such as an aircraft.

The word parachute comes from the French words parer meaning to protect and chute meaning fall carefully down making sure you are safe.Drogue parachutes are used to aid horizontal deceleration of a vehicle (a fixed-wing aircraft, or a drag racer), or to provide stability (tandem free-fall, or space shuttle after touchdown).

Parachutes have got a lot of air resistance which means what ever is inside is safe and secure. If there was no air restance in parachutes people would injur themseves but they have got air restistance so people are safer.

Parachute's are used in a sport called parchuting.

The great inventor Leonardo Da Vinci believed that one day humans would fly . Most of his inventions were never made. However, we found notebooks containing drawings of parachutes and decided to build it .

The word "parachute" comes from "para", meaning "against" or "counter" in Ancient Greek, and "chute", the French word for "fall". Some modern parachutes are classified as semi-rigid wings, which are maneuverable and can make a controlled descent to break on impact with the ground. Only slightly later, a more sophisticated parachute was sketched by the polymath Leonardo da Vinci in his Codex Atlanticus (fol. 381v) dated to ca. 1485.[2] Here, the scale of the parachute is in a more favorable proportion to the weight of the jumper. Leonardo's canopy was held open by a square wooden frame, which alters the shape of the parachute from conical to pyramidal.[3] It is not known whether the Italian inventor was influenced by the earlier design, but he may have learnt about the idea through the intensive oral communication among artist-engineers of the time.[4] The feasibility of Leonardo's pyramidal design was successfully tested in 2000 by the British Adrian Nicholas and again in 2008 by another skydiver.[5] According to the historian of technology Lynn White, these conical and pyramidal designs, much more elaborate than early artistic jumps with rigid parasols in Asia, mark the origin of "the parachute as we know it".

The oldest known depiction of a parachute, by an anonymous author (Italy, 1470s)

An American paratrooper using an MC1-1C series 'round' parachute. A parachute is carefully folded, or "packed" to ensure that it will open reliably. If a parachute is not packed properly it can result in death because the main parachute might fail to deploy correctly or fully. In the U.S. and many developed countries, emergency and reserve parachutes are packed by "riggers" who must be trained and certified according to legal standards. Sport skydivers are always trained to pack their own primary "main" parachutes.

Parachutes can malfunction in several ways. Malfunctions can range from minor problems that can be corrected in-flight and still be landed, to catastrophic malfunctions that require the main parachute to be cut away using a modern 3-ring release system, and the reserve be deployed. Most skydivers also equip themselves with small barometric computers (known as an AAD or automatic activation device like Cypres, FXC or Vigil) that will automatically activate the reserve parachute if the skydiver himself has not deployed a parachute to reduce his rate of descent by a preset altitude.

Exact numbers are difficult to estimate, but approximately one in a thousand sports main parachute openings malfunction, and must be cut away, although some skydivers have many hundreds of jumps and never cut away. Reserve parachutes are packed and deployed differently. They are also designed more conservatively, and are built and tested to more exacting standards, making them more reliable than main parachutes. However, the primary safety advantage of a reserve chute comes from the probability of an unlikely main malfunction being multiplied by the even less likely probability of a reserve malfunction. This yields an even smaller probability of a double malfunction, although the possibility of a main malfunction that cannot be cut away causing a reserve malfunction is a very real risk. In the U.S., the average fatality rate is considered to be about 1 in 80,000 jumps. Most injuries and fatalities in sport skydiving occur under a fully functional main parachute because the skydiver made an error in judgment while flying the canopy—resulting in high-speed impact with the ground, impact with a hazard on the ground that might otherwise have been avoided, or collision with another skydiver under canopy.


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