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vertical probable error
V FE
vertical probable error Product of range probable error
and slope of fall.
vertical reference Earth-related vertical axis, ie local
vertical normally approximated by vertical gyro.
vertical reference gyro Vertical gyro.
vertical replenishment Use of VTOL (helicopter) or
V/STOL aircraft for transfer of stores and/or ammunition
from ship to ship or to shore (NESN).
vertical reverse Aerobatic manoeuvre related to half
flick (snap) roll; begun from tight turn by pulling hard
back and applying full top rudder to flick inverted, thereafter
completing second half of loop to recover level flight;
often called vertical reversement (US term).
vertical riser Flat-rising VTOL, ie jet-lift aircraft taking
off with fuselage horizontal.
vertical rolling scissors Defensive descending
manoeuvre in vertical plane in attempt to make enemy
overshoot and fly into attacker’s future flight path.
vertical separation Specified difference in FL between
air traffic on conflicting courses; normally published for
(1) tracks 000–179 and (2) tracks 180–359, and for FLs
0–180, 180–290 and 290 +.
vertical situation display Abb. VSD, flight instrument
designed to avoid CFIT. It adds a large rectangle in the
lower half of the ND showing a side profile of the flight
path and the terrain, based on current track. This gives a
valuable extra view supplementing TAWS (Boeing).
vertical situation indicator See above.
vertical speed 1 Helicopter autopilot mode, rate of
change of pressure altitude.
2 Loosely, rate of change of height.
vertical speed indicator Panel instrument indicating
vertical speed, ie rate of climb/descent; invariably one
pointer zeroed at 9 o’clock.
vertical spin tunnel See spinning tunnel.
vertical stabilizer Fin (US).
vertical stiffeners Angle or other sections riveted or
bonded at intervals along spar web or fuselage keel to
resist buckling in vertical plane.
vertical strip Single flightline of overlapping vertical
reconnaissance images, eg of beach or road.
vertical tail Traditionally, fin(s) and rudder(s); hence **
area, aggregate area in side elevation of fin(s) and
rudder(s), together with dorsal fin and any ventral fin(s)
but exclusive of fillets, fairings or bullets.
vertical tail length Distance from c.g. to aerodynamic
centre of vertical tail.
vertical tailplane Airbus term for fin.
vertical take-off and landing Aerodyne has capability of
rising from surface without airspeed, hovering and
returning to soft landing again without airspeed, generating
lift greater than its weight by rotors, ducted fans,
jets, deflected propulsion or other internally energized
means.
vertical tape instrument Display has roller blind translating
vertically, against which are read fixed and/or
moving index markers; usually engine instruments are
grouped in multi-engine aircraft so that in correct
operation all similar readouts are at same levels.
vertical translation Motion of aeroplane in vertical
plane, esp. under direct lift force, without change of pitch
attitude; can be achieved, eg, by Harrier viff or by F-16
symmetric wing-flaperon deflection with scheduled flaperon/tailplane
interconnect gain and with pitch hold
engaged.
vertical tunnel See spinning tunnel.
vertical turn Turn with approx. 90° bank.
vertical virage Turn with approx. 90° bank (arch.).
vertical visibility Self-explanatory, can be looking down
or up.
vertical wind tunnel See spinning tunnel
vertigo Subjective sensations caused by faults in
inner ear semicircular canals: subjective * = external
world is moving past sufferer; objective * = external world
is rotating.
vertiplane VTOL aircraft having fixed wing with flaps
powerful enough to lift aircraft at zero forward speed by
deflecting propwash; FAI category E-4 but no records
and (it would appear) no current flying examples.
vertrep See vertical replenishment.
Vervis Vertical visibility.
Very Patented signal pistol, standard Allied aviation
from WW1; hence * light, * pistol etc.
very high Above FL 500 (DoD).
very high frequency 30-300MHz, see Appendix 2.
very high frequency omni-range see VOR.
very high speed photography Image rate 500 to 10 4 /s.
Faster = ultra.
very large aircraft No definition known to exist.
very-large-scale integration Commonly accepted as over
10 5 devices (some authorities, over 16 kbit) per chip.
very low frequency 3–30 kHz, see Appendix 2.
very light aircraft 1 MTOW 750 kg, 1,653lb (FAA).
2 390 kg, 860 lb (BCAR).
V esc Escape velocity = 2K/R where K is a constant
(universal gravitational constant primary-body mass)
and R is distance from centre of primary body.
vespel polyimide Coating for bearing surfaces retaining
low-friction qualities to high temperature.
Vest Visualization of expeditionary support tools [software
integration] (USAF).
Vesta Vecteur à statoréacteur [long-burn ramjet] (F).
vestibule Region immediately inside main entrance
door.
VEWS Volcano early-warning system (US Geological
Survey).
VEX Vertical Extension.
VF 1 Voice, or variable, frequency.
2 Unit prefix, fighter squadron (USN).
V F Design flap limiting speed; replaced by V FE .
V f 1 Surface wind.
2 Volume fraction of fibre or whisker reinforced
composites; expressed as % volume occupied by fibre.
3 Fuel flow (CAA).
4 Aircraft forward velocity at moment of touchdown.
VFB Video-frame buffer.
V FC Maximum speed for flight stability ( FC = full
control); usually synonymous with V MO , little used
outside US and suggest passing from use.
VFCT Voice frequency carrier telegraph.
VFD Vacuum fluorescent display.
VFDR Variable-flow ducted rocket.
V FE Maximum flaps-extended placard speed; usually an
ASIR and in most flight manuals precise meaning is
explained, eg whether limit is for landing setting or any
lesser setting. Note: this is invariably a limit for an established
flap setting; it does not allow for changed settings.
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