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positive stagger
disturbance (upset or gust) in pitch, without pilot action.
Term applies only to motion in vertical plane, along OZ
axis.
positive stagger Leading edge of upper wing is ahead of
that of lower.
positive stall Stall under l g flight or positive acceleration,
ie not from inverted attitude or negative g.
positive yaw Tending to rotate anticlockwise about OZ
axis seen from above, ie nose to left.
positron Short-lived particle equal in mass to electron
but positive in sign.
positron emission tomography Technique for measuring
fluid flow in which positrons are used as labels, generating
511 keV gamma rays which can be read from outside the
structure of an engine or other container.
Posix 1 Portable operating system interface for
computer environments.
2 Also translated as Portable operating system IX.
POSN, Posn Position.
POS-Ref Position reference.
POSS, Poss 1 Power-off stalling speed.
2 Precipitation-occurrence sensor system.
3 Possible (ICAO).
POST 1 Portable optical sensor testbed (hardened
sites).
2 Passive optical seeker technique (or technology).
3 Production-oriented scheduling technique.
4 Point-of-sale terminal.
post 1 Vertical primary structure, eg fin *, king-*.
2 Main landing leg, thus MLG of YC-14 described as
of four-* type.
post-attack period Between termination of nuclear
exchange and cessation of hostilities.
post-boost After cut-off of mainstage propulsion.
post-boost vehicle Vehicle and payload after cut-off of
mainstage propulsion, and hence posing new problems to
SDI acquisition and tracking systems.
post-exit deflector Powered flap(s) downstream of
engine nozzle, able to vector entire thrust for STOVL or
air combat.
post-flight report Basically comprises ECAM warnings
and maintenance status, printed on demand.
post-integration Occurring after assembly of complete
space launch system but before lift-off.
post-pass After (usually soon after) satellite has passed
overhead.
post-stall gyration Uncontrolled motions about one or
more axes, usually involving large excursions in AOA,
following departure (3).
post-stall manoeuvres Manoeuvres carried out [more or
less] under full control with AOA near or even beyonf 90°.
post-strike Immediately after attack on surface target,
hence * reconnaissance provides information for damage
assessment.
posture Military strength, disposition and readiness as it
affects capabilities (DoD).
POT, pot Potentiometer.
pot Piston engine cylinder (colloq.).
potassium K (from kalium), reactive silvery metal, MPt
64°C, density 0.86.
potential 1 In electric field, work done in bringing unit
positive charge to that point from infinite distance.
2 Value atmospheric thermodynamic variable would
power amplifier
have if expanded or compressed adiabatically to 1,000 mb
(100 kPa).
3 Specialized meanings in thermodynamics, geodesy
and celestial mechanics.
potential density That which parcel of air would have if
adjusted adiabatically to 1,000 mb (100 kPa), given by
ρ´ = p/Rθ where ρ´ is **, p is pressure at 100 kPa, R is gas
constant and θ is potential temperature.
potential difference Measured between any two points in
conductive circuit, in volts; if between terminals of
battery, when no current is flowing.
potential energy That possessed by mass by virtue of
position in gravitational field; can yield ** by ‘falling’, ie
moving towards region of lower **.
potential flow Fluid motion in which vorticity is everywhere
zero.
potential gradient Local space (linear) rate of change of
potential.
potential refractive index That so formulated that variation
with height in adiabatic atmosphere is zero.
potential temperature That which parcel of dry air would
have if adiabatically brought to pressure of 100 kPa.
potentiometer 1 Variable resistance (rheostat), esp. one
of precise type giving, eg, accurate radar pointing
information.
2 Instrument for measuring EMF (potential differnce,
esp. DC), usually without drawing current from circuit
measured.
POTS 1 Production off the shelf.
2 Plain old telephone service, or system.
potted device Electronic component encapsulated in
resin, mainly to give mechanical protection.
pouce Inch [measurement unit] (F).
Pounce Air-intercept code: “I am in position to engage
target”.
pound Non-SI unit of mass, abb. lb, = 0.45359237 kg.
Note, plural also lb. Strictly, not the same as force or
weight of 1 lbf.
poundal Non-SI unit of force, abb pdl, = 0.138255 N =
0.31081 lbf.
pound force Abb. lbf, see pound weight.
pounds per square inch Non-SI unit of pressure, abb.
lbf/sq in (psi or lb psi not recommended), = 6,894.76
Pa =6.89476 kPa; = 14.696 ata = 2.03596 in Hg.
pound weight Attraction of standard Earth gravity for
mass of 1 lb, abb. lbf (lb force), = 4.44822 N. See pound.
pour point Temperature established by standard pour
test as lowest at which liquid, esp. fuel or lube oil, will
flow.
POV Pigmented oil varnish.
POW Prisoner of war.
Powdered Tactical code: enemy aircraft broke up in the
air.
powder metallurgy Production of finished or nearfinished
parts by fusion under heat and pressure of metal
in form of finely divided powder. Usually synonymous
with sintering.
power Rate of doing work; SI unit is watt (W) = J/s;
kW = 1.34012 hp = 1.359621 cv, PS; hp = 0.745700 kW;
cv, PS = 0.7355 kW.
power amplification Ratio of AC power at output to AC
power at input circuit.
power amplifier Amplifier designed to deliver large
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