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flush antenna
flush antenna One conforming with external shape of
vehicle.
flush deck Whole ship upper deck at same level.
flush intake Not protruding, orifice in skin of vehicle.
flush on warning Take off immediately radar evidence
suggests hostile missile attack so that, when airfield is hit,
aircraft are just out of dangerous radius of thermonuclear
warhead.
flush rivet Head is flush with surface into which it is
countersunk.
flush weld Plug or butt weld which leaves no weld
material on surfaces.
fluted Skin stiffened by evenly spaced parallel semicircular
channels. External * cannot be aligned with
complex slipstream.
flutter 1 High-frequency oscillation of structure under
interaction of aerodynamic and aeroelastic forces; basic
mechanism is that aerodynamic load causes deflection of
structure in bending and/or twist, which itself increases
imposed aerodynamic load, structure overshooting
neutral position on each cycle to cause load in opposite
direction. Distinguished by number of degrees of freedom
(bending and torsion of wing, aileron and other components
are considered separately), symmetry across
aircraft centreline, and other variables. When heating
involved subject becomes aerothermoelasticity (see classicial
*, hard *, soft *).
2 Radio beat distortion when receiving two signals of
almost same frequency.
flutter model Flexible model with mass distribution,
flexure and other features designed so that flutter qualities
simulate those of full-scale aircraft.
flutter speed Lowest EAS at which flutter occurs.
fluvial Adjective meaning that seaplane [widest
meaning] is intended to operate from calm water only.
Opposite = maritime.
flux 1 Generally, quantity proportional to surface
integral of normal (90°) field (eg, magnetic) intensity over
given cross-section.
2 Volume, mass or number of fluid elements or particles
passing in given time through unit area of cross-section;
eg luminous *, measured in lumens (abb. lm).
3 Magnetic * can be thought of as number of lines of
force passing through particular coil or other closed
figure; symbol Φ, unit weber Wb.)
4 Materials used in welding, brazing and soldering to
clean mating surfaces, and/or form slag, which helps separate
out oxides and impurities by flotation and exclude
oxygen.
flux density 1 Unit of magnetic ** is Wb/m 2 , or tesla (T).
2 Neutron **, and particle physics generally, is particles
per unit cross-section per second multiplied by velocity,
∆ø/∆t = nv.
fluxgate Sensitive detector giving electrical signal
proportional to intensity of external magnetic field acting
along its axis, used as sensing element of most remoteindicating
compasses; also called fluxvalve.
fluxgate compass Uses fluxgate to indicate, subject to
corrections, direction of magnetic meridian.
fluxvalve See fluxgate.
FLW 1 Forward-looking [i.e. predictive] windshear
radar.
2 Follow[s].
flying position
fly a desk Retirement from professional flying (e.g.,
senior officer].
fly-away cost Published retail price of GA aircraft, with
specified avionics fit, ignoring spares, training or support.
fly-away disconnects Launch-vehicle umbilicals on rigid
arms which swing clear under power.
flyback Controlled descent through atmosphere of
returning aerospace-plane.
fly-back period That during which CRT spot returns
from end of one line to start of next when in raster-scan
mode.
fly-back time Time, usually ns or µs, for each fly-back
period.
fly-back vehicle Space vehicle intended to be reusable.
flybar Flying by auditory reference.
fly before buy Philosophy of flight evaluation of new
aircraft type, esp. by military (government) customer for
combat aircraft.
fly-by 1 Interplanetary mission in which TV and instrumented
spacecraft passes close to target planet but does
not impact or orbit it.
2 Slow flight past tower to verify aircraft configuration
or possible damage.
fly-by-cable Mechanical links join cockpit to PFCUs.
fly-by-light Flight-control system with signalling by
optical fibres.
fly-by-speech Flight-control system with input signalled
by voice of pilot (various research programmes).
fly-by-wire Flight-control system with electric
signalling.
flyco 1 Abbreviation for Wing Commander, Flying, at
an RAF station.
2 Position aboard aircraft carrier from which all
aircraft launches and recoveries are controlled.
Flygtekniska Föreningen Society of Aeronautics
(Sweden).
Flygtekniska Försökanstalten Aeronautical Research
Institute (Sweden).
fly-in Informal gathering of private and club aircraft at
particular airfield, usually with a relaxed programme of
events and competitions.
flying blind Piloting without external cues.
flying boat Seaplane whose main body is a hull with
planing bottom; US = boat seaplane.
flying cable Connects captive or kite balloon to winch.
flying club Civilian group formed to assist its members
to fly light aircraft as owner, hirer, pupil or pasenger. It
need not itself own an aircraft, or an airfield. First UK was
Midlands Aero Club, 3 September 1909.
flying controls See control system.
flying diameter Overall diameter of circular parachute
canopy in normal operational descent.
Flying Farmers Association of over 400 airstrip owners
[not necessarily farmers] (UK).
flying grading See grading.
flying machine Powered aerodyne; common pre-1914,
today humorous or derogatory.
flying order book Set of rules governing the flying of
aircraft owned by a club (UK usage), or by club members.
flying pay Extra emoluments payable to military aircrew
when actively engaged in flying operations.
flying position Attitude of aircraft when lateral and
longitudinal axes are level or in flight attitude; esp. when
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