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static ceiling
along interior of transport to which parachute strops of
troops and airdropped loads are attached. Also called
strop line, anchor cable.
static ceiling Altitude at which airship in ISA (in some
definitions, without forward speed) neither gains nor loses
altitude after all ballast has been dumped.
static characteristic Basic plot of thermionic valve, grid
volts against anode current.
static clash detection Use of detailed 3-D computer
simulation in the design process to confirm that an
assembly can actually be assembled without conflict.
static coefficients Those obtained from a static body,
e.g., in a wind tunnel.
static conversion Conversion of energy from one form to
another without use of moving parts; common example is
solid-state AC/DC converter.
static discharger Device for harmless distribution of
static electricity, static wick.
static electricity Electric charge built up on non-conductive
surface or insulated body by deposition of electrons
or positive charges, eg by friction between air and aircraft
or between fuel and hose, ultimately reaching very large
potential difference.
static firing Firing test of rocket motor, engine or vehicle
while attached to test stand.
static flux Magnetic field through magneto frame and
inductor with latter stationary.
static friction Force required to initiate relative movement
between surfaces in contact.
static gearing ratio Ratio of angular deflection of vehicle
(esp. missile or RPV) control surface to rotation of vehicle
axis which caused surface to deflect.
static ground line Connection of aircraft earthing
(grounding) system to earth.
static head Pitot head measuring ambient static
pressure.
static instability Unlikely design fault in which aircraft,
once disturbed from straight/level flight, suffers
increasing upset in absence of aerodynamic inputs, eg due
to high c.g.
static inverter Non-rotating device for converting a.c. to
d.c.: two forms, either transistor or gas tube [eg
thyratron].
static lift Difference in mass between gas contained in
aerostat at rest and air displaced by whole aerostat.
static line 1 Links parachute with static cable so that as
parachute leaves aircraft it is opened automatically.
Hence ** jump.
2 Line of parked aircraft on static display at airshow.
static load Applied force is unidirectional, either held
constant or increasing in programmed way from zero to
maximum.
static longitudinal stability Static stability (1).
static margin Basic measure of aeroplane static stability
(primarily in pitch), normally defined as distance of c.g.
ahead of neutral point expressed as %MAC. Measured
stick-fixed or stick-free; former is %MAC proportional to
stick displacement with percentage change of speed from
trimmed value, called positive when direction backward
for lower speed; stick-free is %MAC proportional to rate
of change of applied stick force with percentage change of
speed from trimmed speed, positive when pull needed by
lower speed. Often written L np or l np ; in US often h np – h cm .
static temperature
static marking Flaws on imagery caused by staticelectricty
discharge.
static moment Product of area and its distance
(measured from centroid) from reference axis.
Staticon Photoconductive type of TV camera tube.
static pin Wire fitting, usually multi-pin, pulled from
parachute by static line.
static port See static vent.
static positioning GPS output made possible by fact
receiver is fixed relative to Earth.
static power installation Electrical ring mains on airfield.
static pressure That exerted by fluid on surface of body
moving with it; alternatively on a surface exactly parallel
to local free-stream velocity vector and which does not
affect local flow.
static pressure gradient Possible progressive increase in
static pressure along constant-section duct, eg tunnel
working section, resulting from progressive thickening of
boundary layer.
static pressure head See static head.
static probe See static head.
static propeller thrust That generated by propeller
restrained against movement.
static radar One whose scanning is electronic, not
mechanical.
static radial Normal radial engine, as contrasted with
rotary.
static rail Rigid form of static cable.
static RAM Constructed of bistable transistor elements,
not needing refreshing.
static sag Angular or vertical-linear distance through
which a structure sags at rest compared with some other
reference condition, esp. wingtip at rest compared with 1 g
flight.
static seal Seal [of any kind] between two components
between which there is only microscopic movement, even
though both may be in high-speed motion together.
static soaring Soaring (US term, now arch., contrasting
normal soaring with so-called dynamic soaring).
static-source error Correction applied to measured
static pressure [of particular aircraft] to give correct
reading over range of altitudes and Mach numbers.
static-source selector Pilot switch connecting static
system with chosen sensor.
static stability 1 Measure of tendency of aeroplane to
return to or diverge from initial trimmed condition
following upset, with throttle[s] fixed.
2 Study of applied moments imposed on aeroplane
following upset of AOA or speed from initial trimmed
condition.
3 Quality of having positive static margin.
4 Stability attained by action of weight, esp. by having
low c.g. (common US definition entirely unrelated to
normal meanings).
static-stability compensator Limited-authority
subsystem which ensures aeroplane has stick-free static
stability by applying small nose-down trim force immediately
before stalling AOA is reached, esp. to avoid
self-stall; in UK called static-stability augmenter.
static system Barometric-ASI plumbing incorporating
pitot/static head of static vent and connections to ASI,
VSI and possibly other devices; usually includes alternative
sources.
static temperature T s , temperature measured by
655