page 6 - CYPRES 2 User’s Guide -
1.3 How CYPRES works
Every time CYPRES is switched on, it measures
the air pressure several times in a short period of
time, takes the average value as the value for ground
level, thus „zeroing“ itself. This happens during the
integrated self-test.
While it is in use, CYPRES constantly checks the
air pressure while on the ground and, if necessary,
adjusts to changing weather conditions. Even though
you might need to reset your altimeter before a jump,
CYPRES takes care of itself. This very accurate cali-
bration is the basis for CYPRES to recognize exactly
the activation altitude and speed.
The processing unit contains a factory programmed
microprocessor that is capable of real-time calcula-
tions of the jumper‘s altitude and rate of descent based
on barometric pressure.
By monitoring this data, certain criteria are generated
from which conclusions are drawn. Should the con-
clusion be that the jumper is in a dangerous situation
(i.e. still in freefall at a low altitude) the processing
unit triggers the release unit to initiate the reserve
container opening sequence.
The release unit (cutter) system for the reserve con-
tainer is completely independent of the rig‘s primary
system, because it does not pull the ripcord pin out
of the closing loop, but rather cuts the loop inside the
reserve container to initiate the opening sequence.
The reserve closing loop has to pass through the
cutters passing hole.
Initiating the opening sequence of a reserve container
by cutting the loop is a method invented and patented
by the founder of Airtec, Helmut Cloth, in 1987.
The CYPRES‘ activation system has these advan-
tages:
• The reserve container opening sequence can be
initiated in two different ways. One method is by
the jumper manually pulling the reserve release
handle. The other method is by CYPRES when
it automatically cuts the closing loop.
• Mechanical components are reduced to a single
movable piston in the release unit.
• The activation system is located inside the
reserve container where it is not exposed to
excessive shock or other adverse inuences.
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