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starter is engaged. The slip clutch minimizes the shock that could damage the engine or the starter when the
starter engages.
slip joint (reciprocating engine exhaust system component). A type of connection used in the exhaust
system of a reciprocating engine that provides for the expansion of the system components as they get hot.
The exhaust system is assembled and connected together with ball joints, bellows, and slip joints that allow
the system to move and not crack. Slip joints fit together loosely when the system is cold, but tighten when
the components reach their operating temperature.
slippage mark (tires and tubes). A small mark painted between a wheel and a tube-type tire. The mark is
half on the tire and half on the wheel. If the mark on the tire is not lined up with the mark on the wheel, it
shows that the tire has slipped on the wheel. When a tire slips, the valve in the tube is likely to be damaged,
and the tire should be removed from the wheel and the tube examined.
slip rings (electrical machine). Smooth, continuous rings of brass or copper mounted on the rotor shaft of
an electrical generator or alternator. Current used to produce the magnetic field in the rotor of a DC
alternator flows into the rotor coil through slip rings. Slip rings also carry current into the deicer heating
coils on an airplane propeller blade.
slip-roll former (sheet metal tool). A type of sheet-metal shop tool used to form large-radius curves in
sheets of metal. Slip-roll formers have three hardened steel rollers mounted in a framework. One roller, the
drive roller, is turned with a hand crank to pull the metal through the former. The clamp roller is adjustable
up or down to clamp the sheet metal tightly against the drive roller.
The radius roller is adjustable so it can be pressed against the metal to bend it as the metal is
pulled by the clamp roller and drive roller. This determines the radius of the bend.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 534
slip stick (mathematics). A commonly used term for a slide rule. This name comes from the fact that most
slide rules have a slide that slips in and out of grooves in the body of the rule.
slipstream (aircraft operation). The strong flow of air moved rearward by an airplane propeller.
slipstream area. For the purpose of rib stitch spacing, the slipstream area is considered to be the diameter
of the propeller plus one wing rib on each side.
sloshing compound (fuel tank sealant). A rubbery sealant used to line the inside of built-up metal fuel
tanks. The sloshing compound is poured into the tank until the tank is about half full. The filler cap is
installed and the tank rotated until the compound covers all of the internal surface. Then the compound is
drained from the tank. The compound that sticks to the walls of the tank cures to form a tight seal over all
of the seams in the tank.
slot (aerodynamic component). A fixed, nozzle-like opening near the leading edge of an airplane wing,
ahead of the aileron. A slot acts as a duct to force air down on the upper surface of the wing when the
airplane is flying at a high angle of attack. Forcing the air down on the top of the wing allows the airplane
to fly at a higher angle of attack before it stalls.
Since the slot is located ahead of the aileron, the aileron remains effective even at very high angles
of attack.
slotted flap (aircraft secondary control). A type of trailing-edge flap that forms a slot between its leading
edge and the inside of the flap well in the wing. This slot directs fast-moving air over the lowered flap and
prevents it separating from the flap upper surface. The air flowing over the top of the flap increases the lift
produced by the wing when the flap is lowered.
slotted-head screw. A screw having a single, straight slot cut across its head for the blade of a screwdriver
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 535
to fit.
slotted nut. A regular hexagon nut with slots cut across its top. A cotter pin is installed through a hole in
the shank of the bolt and through the slots in the nut to safety the nut to the bolt. Slotted nuts differ from
castle nuts in that the sides of slotted nuts are straight, rather than domed.
slow-blow fuse. A special type of fuse that allows a large flow of current for a short period of time, but
opens the circuit if current in excess of its rating flows for a longer period. Slow-blow fuses are used in
electric motor circuits and circuits with incandescent lamps. Both of these circuits have a large inrush of
current when the switch is first closed, but when the motor begins to turn, or when the lamp filaments heat
up, the current drops to a much lower value.
　
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