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ejector lift
ejector lift Method of powered lift in which high-energy
flow of hot gas (rarely, HP bleed air) from jet engine is
expelled downwards through arrays of nozzles in large
profiled vertical duct to entrain much greater flow of free
air.
ejector nozzle Propulsive nozzle for engine of supersonic
aircraft whose jet can entrain a large surrounding airflow.
ejector ramjet See ram-rocket.
ejector seat See ejection seat.
EJS Enhanced JTIDS.
EK Equatorial air mass.
EKG Electrocardiograph.
Ekman layer Transition between surface boundary
layer and free atmosphere.
EKP Electronic knee-pad.
EKV Exatmospheric kill vehicle.
ekW Equivalent shaft power of turboprop, measured in
kW. See equivalent power.
EL 1 Electroluminescent.
2 Ejector (augmented) lift.
3 Emitter locator (or location).
4 Elevation [or el].
5 Electronic logbook; also see ELB.
6 Expeditionary logistic [EAW] (RAF).
E L Reduced elastic modulus in local buckling.
Elac, ELAC 1 En-route low-altitude chart.
2 Elevator and aileron computer.
Elass, E-LASS Enhanced low-altitude surveillance
system.
elastance Inability to hold electrostatic charge.
elastic axis Spanwise line along cantilever wing along
which load will produce bending but not torsion.
elastic centre 1 Point within wing section at which
application of concentrated load will cause wing to deflect
without rotation.
2 Point within wing section about which rotation will
occur when wing is subjected to twist.
elastic collision Collision between two particles in which
no change occurs in their internal energy or in sum of their
kinetic energies.
elastic instability Condition in which compression
member will fail in bending before failing compressive
strength of material is reached.
elasticity Property of material which enables a body
deformed by stress to regain original dimensions when
stress is removed.
elasticiser Elastic substance or fuel used in solid rocket
propellant to prevent cracking of grain and bind it to case.
elastic limit Maximum stress withstood by material
without causing permanent set or deformation. Hooke’s
Law asserts that within ** ratio of stress to strain is
constant.
elastic model Linear dimensions, mass distribution and
stiffness are so represented that aero-elastic behaviour of
model can be correlated with that of full-scale aircraft.
elastic modulus Ratio of stress to strain [up to elastic
limit].
elastic stability Able to bear compressive yield stress of
materials without buckling.
elastic stop nut Nut in which self-locking is ensured by
ring of fibre in which threads are formed as nut is screwed
down.
elastivity See specific elastance.
elastomeric bearing Bearing in which angular (and some
electric propulsion
linear) relative motion is permitted by distortion of
flexible blocks bonded to the two parts. Needs no
maintenance.
elastomers Rubber-like compounds used as pliable
components in tyres, seals, gaskets etc.
elasto-optical effect Variation in length and refractive
index of fibre optics when subjected to tensile stress.
elastoplasticity Theory of finite deformations.
el-az Elevation/azimuth.
ELB 1 Emergency locator beacon [A adds aircraft].
2 Extended [or extension of the] littoral battlespace.
3 Electronic logbook; FCG adds fault-correction
guide, ISE in-service evaluation.
ELBA Emergency locator beacon, aircraft.
elbow 1 Angled section of piping used where change of
direction is necessary.
2 Hollow fixture used for joining two lengths of electric
conduit at an angle.
ELC Engine-life computer.
ELCH Elasticity laminate checker.
ELCU 1 Electrical control unit (CAA).
2 Electronic load-control unit.
ELD 1 Electroluminescent display.
2 Earth leakage detector.
ELDO, Eldo European Launcher Development Organization
(1960, now defunct).
elec Usually electrical, not electronic.
ElectRelease Patented epoxy adhesive, rapidly disbonded
by application of low voltage.
electrical-discharge machining Shaping hard metals by
making the workpiece the anode in an electric circuit and
eroding it by a shaped cathode tool, all submerged in
ionised electrolyte.
electrical engine Rocket in which propellant is accelerated
by electrical device; also called electric rocket (see
electric propulsion).
electrical interference Undesirable and unintended
effects on equipment due to electrical phenomena associated
with other apparatus, cables, materials or
meteorological conditions.
electrical load management Supervises links between
generators/alternators on main engines and APU,
batteries and ground power supplies and on-board loads.
electric altimeter Indicates height by variation of electrical
capacitance. Also called electrostatic or capacity
altimeter.
electric bonding Interconnection of metallic parts for
safe distribution of electrical charges.
electric braking Use of powerful [rare-earth] electromagnets
to squeeze the landing-gear brake rings.
electric energy Product of current and time, 1MJ =
0.277 kWh, 1J = 1Ws.
electric field strength Electric potential per unit distance
across field, symbol E, units volts per metre.
electric flux density Also called dielectric flux density, D
= 4π × displacement current, units coulombs/metre².
electric gyro One whose rotor is driven electrically.
electric propeller One whose pitch-change mechanism is
actuated by an electric motor and gearbox.
electric propulsion General term describing all types of
propulsion in which propellant consists of charged electrical
particles accelerated by electric or magnetic fields or
both; eg electrostatic, electromagnetic or electrothermal.
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