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Ratio of the amount of water vapor
present in the air to that which the air
would hold at saturation at the same
temperature.
RELEASE, BAROMETRIC
PRESSURE—A device of the
automatic opening of a free-fall parachute
operating on the differences of
barometric pressure.
RELEASE, RISER—A canopy
release.
REPACK CYCLE—The time
that a certificated parachute is considered
to be airworthy before being
inspected and repacked. The current
U.S. repack cycle is 120 days.
RESERVE PARACHUTE—
The second or “auxiliary” parachute
worn by a person making a premeditated
jump.
RESERVE STATIC LINE
(RSL)—A backup device for activating
the reserve after a cutaway.
Usually a line, webbing or cable,
which connects the main risers with
the ripcord handle, housing, or cable.
RESTITCHING—The process
of sewing directly over base or broken
stitching.
RETAINER BAND—A rubber
band used to hold folded suspension
lines or static lines to the parachute
pack.
RIGGER ROLL—To prepare
an unpacked parachute for storage by
rolling the canopy into a ball with the
suspension lines around it.
RIGGING, PARACHUTE—
The process of inspecting, repairing,
and replacing minor parts of a parachute
assembly, and of repacking the
G-11
SEAM, RADIAL—A seam
extending from the skirt to the apex,
joining two gores. A portion of the
suspension lines may be concealed in
the tube formed by the radial seam.
SEAMS—Where two pieces of
fabric are joined together.
SEAR—Damage to fabric or lines
by heat generated through rubbing.
The melting of webbing, fabric or
line of nylon to prevent fraying.
SEAT PARACHUTE— Parachute
positioned below the back of
the wearer. Forms part of the seat
cushion in the aircraft.
SECTION—Any one of the
pieces of cloth which, when assembled,
form one gore of a parachute
canopy. Also known as a panel.
SELVAGE EDGE—The edge of
cloth which is so woven as to prevent
raveling.
SENIOR PARACHUTE
RIGGER—An individual certified
by the FAA to pack and maintain
parachutes. A journeyman
level classification of parachute
rigger.
SEPARATOR, LINE—A slotted
metal or wood device used to
hold suspension lines at the canopy
skirt after separation into groups during
packing.
SEWING MACHINE KNEE
LIFTER—A knee operated mechanism
which lifts the presser foot of a
sewing machine.
SEWING MACHINE
UPRISE—The uprise is the
upright part of the head (generally
located on the right side of the head)
that houses a portion of the moving
parts that transmit motion through
mechanical shafts and linkages to the
mechanisms in the base of the
machine.
SEWING MACHINE—A
machine with a mechanically driven
needle used for sewing.
SEWING PATTERN—A
design outlined in drawings for joining
parts.
SHOCK CORD—A straight
elastic cord comprised of continuous
strands of rubber encased in a braided
cover. Used today primarily for
Safety Stow® loops on free bags.
SHOCK LOAD—The maximum
force exerted on the canopy by inflation.
This maximum force may be the
snatch force or it may be the opening
shock.
SHOCK, OPENING—The maximum
force developed during inflation
of the canopy. Follows the snatch
force.
SHOT BAG—A parachute packing
tool. A rectangular bag filled with
shot and used to hold folded gores in
position during packing.
SHOULDER STRAP—That
part of the harness webbing which
crosses the wearer’s back diagonally
between the shoulder blades and the
horizontal backstrap.
SIDE FLAP—A fabric extension
on each of the long sides of the pack
which fold over to enclose the
canopy.
SILK—A fiber produced by the silk
worm.
SINGLE POINT RELEASE—
A harness release which has a single
closure such as the T-10 type; also, a
canopy release system operated by
one hand or action.
SINGLE THROW
ZIGZAG—A machine zigzag
stitch from left to right to left, etc.
Also known as a 304 stitch.
SKIRT—The reinforced hem forming
the periphery of a canopy.
SKYDIVING—A popular name
for sport parachuting.
SLAG—A type 6 deployment
device. A short sleeve configuration
used on ram-air parachutes.
　
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