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electrostatic storage
electrostatic storage Storage of information as electrostatic
charges.
electrostatic unit, ESU Unit of electric charge, amount
of charge which repels similar charge in vacuum with force
of one dyne; a statcoulomb.
Elektron Magnesium alloys with 3–12% aluminium,
0.2–0.4% manganese and often 0.3–3.5% zinc.
element 1 In electron tube, constituent part that
contributes to electrical operation.
2 In circuit, electrical device such as inductor, resistor,
capacitor, generator, line, electrode or electron tube.
3 In semiconductor device, integral part that
contributes to its operation.
4 Parameters defining orbit of body attracted by
central, inverse-square force: longitude of ascending
node, inclination of orbit plane, argument of perigee,
eccentricity, semimajor axis, mean anomaly and epoch.
5 Flight of two or three aircraft (US) or basic fighting
unit of two aircraft (UK).
6 Component parts of aircraft sufficiently distinctive
and specific in type, shape or purpose as to be of major
importance in design.
elementary charge Electron charge.
elementary trainer Ab initio, also known as primary
trainer.
element leader Lead aircraft or pilot of element or flight.
elephant ear 1 Thick plate on rocket or missile used to
reinforce hatch or aperture.
2 Air intake consisting of twin inlets, one on each side
of fuselage.
3 Quasi-circular balancing area ahead of hinge axis of
flight-control surface [rare after 1920].
Elev, elev Elevation.
elevation 1 Side or front view as drawn in orthographic
projection.
2 Vertical distance of point or level, measured from
mean sea level.
3 See airfield*.
4 Angle in vertical plane between local horizontal and
line of sight to object.
elevation rudder Elevator (arch.).
elevator 1 Movable control surface for governing
aircraft in pitch.
2 Effectiveness of pitch control, as in expression “to run
out of *”.
3 In air intercept, code meaning ‘take altitude indicated
(in thousands of feet), calling off each 5,000 ft increment’
(DoD).
elevator angle Angle between chord of elevator and that
of either the tailplane or aircraft longitudinal axis.
elevator tab Trim (or other) tab attached to elevator.
11-9 Date of 2001 terrorist attacks on US.
elevons Wing control surfaces combining functions of
ailerons and elevators, esp. on delta-wing or ‘tailless’
aircraft.
elex Electronics (colloq.).
e.l.f., ELF 1 Extremely low frequency, see Appendix 2.
2 Electronic location-finder.
3 Aerosports federation (Estonia).
4 Early long flights [flight-test programme].
Elfaa European Low-Fares Airlines Association
[January 2004–, 12 members] (Int.).
Elfin ATR racking and module for housing instrument,
electronic unit or other equipment.
EMAGR, E-MAGR
ELG 1 Emergency landing ground.
2 Electric Landing Gear (UK 2004–).
ELGB Emergency Loan Guarantee Board.
Elint Electronic intelligence.
Elinvar Trade name for an invar of steel character.
Elios Elint identification and operating system.
Elips Electronic integrated protection shield.
Elite Trade name for new [2005] range of lubricating
oils, initially 20W-50.
ELJ External-load jettison.
elliptical orbit Orbit of space object about primary body
having form of ellipse. Nearest/furthest points pericentre/
apocentre.
elliptical wing Aerodynamic theory shows that for
highest efficiency (lowest induced drag) the planform
should be an ellipse with the quarter-chord line straight.
elliptic loading Ideal form of spanwise loading of wing,
lift vectors forming semi-ellipse seen in front elevation.
ELM 1 Extended-length message.
2 Electrical load management [S adds system, U unit].
elongation 1 Increase in length of hardware under
tension.
2 Angle at Earth between lines to Sun and another
celestial body of the solar system.
ELP Electroluminescent panel.
ELQA Extended link quality analysis (TADIL).
ELR 1 Environmental lapse rate.
2 Extra-long-range.
3 Eyesafe laser ranger, or rangefinder.
ELS 1 Emitter location system.
2 Emergency landing strip.
3 (Electron) energy-loss spectroscopy.
4 Electronic library system.
5 Elementary surveillance.
Elsa Electronic lobe-switching antenna.
Elsec Electronic security.
ELSS Environmental life-support system.
ELSSE Electronic sky screen equipment; indicates
departure of rocket from predetermined trajectory.
ELT 1 Emergency locator transponder, or transmitter.
2 Enforcement of laws and treaties.
3 Electronic light table, for EO reconnaissance.
4 Emergency landing technique.
ELV Expendable launch vehicle.
Elvis Enhanced linked virtual information systems.
EL/VT, ELVT Ejector lift, vectored thrust.
EM 1 Electromagnetic.
2 Energy manoeuvrability.
3 Electron microscope.
4 Element manager.
Em Emission.
e.m. Electromagnet.
e/m Electron charge/mass ratio.
EMA 1 Electromechanical actuator, or actuation.
2 Electron microprobe analysis.
3 External mounting assembly (helicopter).
4 Electronic missile acquisition.
EMAA Etat-Major de l’Armée de l’Air (Chief of
Staff, F).
EMAD Engine-mounted accessory drive.
EMADS Euromux management and data sheets.
EMAGR, E-MAGR Enhanced miniaturized airborne
GPS receiver.
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