Here are the main types of AAD, which are widespread among the parachutists:
Parachute semiautomatic combined and unified PPK-U is used to actuate the device reveals a parachute. The device is used on parachutes as a means of insuring when a parachutist for one reason or another did not open the parachute using the pull ring.
The device consists of a body with a tube, hose, clockwork and aneroid devices. To bring the device to a working state of his platoon, after inserting a pin into a flexible shutter.
The device PPK-U has a different labeling and packaging in accordance with it. The first four letters signify the name of the device. Three figures for the length of their mechanism exhaust hose (120, 240, 405, 165, 575 mm). The letter after the numbers determines how the device is equipped with a loop. The letter A corresponds to a short loop which is used in the rescue and sports-training parachutes. B - curly loop for parachutes with two taper lock. The letters - elongated loop is rarely used. If the letter V is the letter T, it is not included flexible hose and such devices are used in the ejection units. Letters GR y is determined after a shortened course of the exhaust mechanism (40 mm vs. 70 mm conventional) - such devices are put on the cargo system.
Manufacturer: Second Moscow Instrument-Making works.
Fully mechanical (and PPK-U) device. Produced in France by American license since 1979 by Parachutes de France.
The device consists of two parts: the main unit - sensor vertical velocity and cutter - is located inside the backpack and open the reserve parachute.
The control unit with barometric sensor. Located on the suspension. It is set QFE.
The device does not work with the rate of decline of less than 12 m/s. The device is triggered when the rate of decline of more than 20 m/s at a height too low.
Height operation set in the range 300-1200 m.
Recommended for use on student and military parachute systems.
Manufacturer: Parachutes de France.
Cypres (Cybernetic Parachute Release System) - a fully electronic instrument that works on the principle of "plug and forget". CYPRES consists of a microprocessor device self-testing, the control panel, which is made using beforejump height adjustment, and the cutter. On knapsacks with two pins is used with two pyrotechnical device. When the Cypres performs a self during which determines the height of the airfield. During the day the instrument amends by measuring the pressure twice a minute. When triggered, the device for locking the cutter cuts the loop of the reserve parachute. Cypress is running on battery, which is designed for its work for about 2 years, or about 500 jumps.
Available in six models Cypres - Expert, Student and Tandem - each with one (1-pin) or two (2-pin) pyrotechnical.
At Cypres Expert button on the control panel of red color.
His cutter triggered if the rate of decline of more than 35 m / s at a height of about 225 meters. In the event of a cutaway at elevations below this height CYPRES will operate up to a height of approximately 40 m. Below 40 m opening the PP does not make sense - at this altitude work Cypres stops.
At Cypres Student button on the control panel of yellow color with the inscription «Student». His cutter triggered if the rate of descent of 13 m / s. The height of the operation is different. In the case of rate of descent equal to the speed of free fall height of the operation that is about 225 m is the same as that of the Cypres Expert. However, if the rate of decline is less than the speed of free fall, but still more than 13 m / s (ie, partially open the dome), at an altitude of 300 meters work squib.
At Cypres Tandem button on the control panel in blue with the words «Tandem».
His cutter triggered if the rate of decline of more than 35 m / s at a height of about 580 meters.
Cypres 2 - this is a step forward. Realizing that the paratroopers are skeptical and cautious to treat the full conversion of the product, Airtec engineers decided to keep the new version of the device almost all the main characteristics of Cypres.
The main innovation of the new instrument - hi-tech battery and related power-management technology.
The first device operates on batteries, lithium-C-cell, that need to be replaced after two years or after 500 jumps. Cypres 2 runs on batteries, hi-tech, service life is about 4 years.
The device Cypres 2 less than its predecessor, but at the same time has a more rugged casing with rounded corners. C2 waterproof to a depth of 15 feet (4.7 meter) for 15 minutes. (If the unit still gets wet, replace the filter, otherwise the instrument will not work.) It weighs a little less than a new device first.
New options: the device is still controlled by a single button, but when turned on, this button can also display the serial number and date of the next routine test. Self-testing device (self-test) takes less time. The former option (included in the new device) operation at a certain height, depending on the operation speed drops and the algorithm (principle) instrument response, depending on the situation.
Airtec have already sold more than 50,000 units Cypres. Thousands of them are used daily. For 10 years of his service Cypres has earned an enviable reputation around the world for its trouble-free operation and no false positives. The company Airtec has information about more than 1,000 lives saved. Founder and president of the company Helmut Klos it can not but rejoice.
Cypres 2 has a 12-year lifespan and, just like its predecessor Cypres, is required every 4 years (after 4-el and 8 years of use) be checked in service center. The test includes the replacement of the batteries.
At Cypres 2 check may be carried out, plus (minus) 6 months from the date of the put, unlike (plus or minus) 3 months in Cypres. On the bags, which fit Cypres, without any problems come up and Cypres 2.
Cypres 2 as well as Cypres, has three versions: Expert, Tandem, and Student. Cypres 2 sold since May 2003. New waterproof cutter from Cypres 2 as the first approach and Cypres.
A few weeks later, after the announcement of the release of Airtec Cypres 2, a small Belgian company announced the release of a new device ADD Vigil with promising characteristics. If you believe the creators of the new device, it can become a serious competitor Cypres 2.
Vigil - safety device, like Cypres. Just like Cypres, Vigil consists of a control unit (including a computer and the battery), the cutter and the console display. Judging by the size, devices from each other does not differ. Representatives of the Advanced Aerospace say Vigil suitable for all backpacks that are suitable for the installation of Cypres. At Vigil battery similar Cypres 2 to be replaced after 4 years of use. It seems that the Advanced Aerospace Designs simply just cloned Cypres 2. However, the devices have a number of distinctive features.
Firstly, for instruments not provided periodic Vigil (4-year) to check the service center. That is, when a low battery appears on the display corresponding to the label and the user can replace the battery yourself. The device has an unlimited guarantee. The only exception is the release unit, which is designed for 20 years.
When comparing the Cypres and Vigil, we can say that the latter is "closer" to the people. One of the main advantages of the Vigil Cypres is that the touch of a button the device can be programmed as an expert, student or tandem version.
Vigil has similar Cypres'u nominal value of height and speed of response. Unlike Cypres, a program (set) downloaded to a computer Vigil'a can be changed via a built-in infrared port. Rigger using this port can print the results of the device during its operation and the parachutist can clearly see the number of jumps made to them, and the free fall. Vigil as Cypres has a shell in water protection as well as protection from electromagnetic radiation. The device is on sale from July 2003. When comparing the instruments we should mention this fact: users Cypres every four years should be laid out on more than $ 200 for the next. service. But just do not forget that safety comes first. Ten years of trouble-free operation speak for themselves. Skydivers know what would have happened in the air - you can rely on Cypres. Moreover, the Vigil is still in the testing phase.
Advanced Aerospace said that in the past two years have tested this unit in a high-pressure chamber and directly at skydiving.
Manufacturer: Advanced Aerospace Designs
Many thanks to the site www.volosovo.ru for assistance in preparing this material.