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drag strut
[e.g. by splitting into upper/lower halves] on tailless
aircraft.
drag strut Strut reacting drag forces, esp. one incorporated
in a wing.
drag-weight ratio Ratio of total drag at burnout to total
weight of missile or rocket.
drag wires 1 Wires inside or outside wing(s) to react
drag.
2 Wires led forward from car or other nacelle of airship
to hull or envelope to react drag.
drain mast Pipe, usually telescopic through which liquid
[fuel, water from cabin environmental system, grey water]
can be extracted. No relevance to toilet servicing.
drains tank May be provided to collect fuel that escapes
from any part of the [gas-turbine] engine, often continuously
emptied by suction into the combustion chamber.
Fuel is drained here after shutdown, and an ejector pump
may transfer it back on engine start.
DRAM, Dram Dynamic random-access memory.
draping code Virtual processing tool [simulation] for
composite structure in which dry preform[s] are wrapped
around smooth tool.
Drapo Dessin et réalisation d’avions par ordinateur (F).
drawing introduction schedule Checks details for compliance
with authorities.
DRB Defense Resources Board (US).
DRC 1 Defense Review Committee (NATO).
2 Data-recording cartridge.
DRD 1 Dry-runway distance.
2 Digital radar display.
DRDB Dual-redundant data bus.
DRDC Defense Research and Development Canada
(Valcartier, Quebec).
DRDF VHF/UHF radio D/F (UK).
DRDL Defence R & D Laboratory (Hyderabad) or
Laboratories (India).
DRDO Defense R & D Organization (US, India).
DRDPS Digital radar data-processing system.
DREA Defence Research Establishment Atlantic
(Canada).
DRED Ducted-rocket engine development.
Dreem Drone radar electronic enhancement
mechanism.
Drem lighting Visual landing approach aid with red,
amber and green lights in accurately inclined tubes
pointing up glidepath (from RAF Drem, Scotland, 1937).
DREO/P/S Defense Research Establishments: Ottawa/
Pacific/Suffield (Canada).
DRER Designated Radio Engineering Representative
(FAA).
Dress Distributed and redundant electrical nose-gear
steering system.
dressed Equipped with all externally attached accessories,
piping and control systems, esp. of an aircraft
engine or accessory gearbox.
DRET Direction des Recherches, Etudes et Techniques
(F).
DREV Defense Research Establishment, Valcartier
[Québec G3R 1X5] (Canada).
DRF 1 Dual-role fighter.
2 Deutsche Rettungsflugwacht eV, air rescue service
(G).
3 Data-recording facility.
dripshield
DRFM Digital RF memory; S adds system[s], TG techniques
generator.
DRFT Drift
DRG During.
DRIC Defence Research Information Centre (UK,
Glasgow).
DRI/DRO Dolly roll-in to dolly roll-out; engine-change
elapsed time.
Drier, DRIER Dial-up rate IP [internet protocol] over
existing radios (USAF).
drift 1 Lateral component of vehicle motion due to
crosswind or to gyroscopic action of spinning projectile.
2 Slow unidirectional error movement of instrument
pointer or other marker.
3 Slow unidirectional change in frequency of radio
transmitter.
4 Angular deviation of spin axis of gyro away from
fixed reference in space.
5 In semiconductors, movement of carriers in electric
field.
6 Drag (until 1915).
7 Outward flow of boundary layer over swept wing,
drawn towards tips by peak suction.
drift angle Angle between heading (course) and track
made good.
drift climb Gentle climb after takeoff through noisesensitive
area at power just sufficient for ROC to be
positive.
drift correction Angular correction to track made good
to obtain correct track (for navigation, bombing, survey
etc).
drift-down Gradual en route descent from top of flight
profile (now rare).
drift error Change in output of instrument over period
of time, caused by random wander.
drift indicator See drift meter.
drift meter Instrument indicating drift angle; in simple
optical form a hair line is rotated until objects on ground
travel parallel with it.
drift sight See drift meter.
drill 1 Correct procedure to be followed meticulously,
eg in particular phase of flight such as takeoff.
2 Training flight by a formation, including formation
changes.
drill card Checklist for correct procedures to be followed
in particular phase of flight.
drill round Dummy missile or gun ammunition used for
training.
D-ring 1 Ring in shape of capital D to which suspension
ropes from balloon or other lighter-than-air craft are
attached.
2 Handle for pulling parachute ripcord.
drink [the] Open sea or ocean (RAF colloq., equivalent
to oggin).
drip flap Strip of fabric secured by one edge to envelope
or outer cover of balloon or other lighter-than-air craft to
deflect rain from surface below it and prevent it from dripping
into basket or car; also helps to keep suspension
ropes dry and non-conducting. Sometimes called drip
band or drip strip.
drip loop Inserted in wiring loom to allow for future
extra length, and to direct condensation to drip in harmless
place.
dripshield Any tray for collecting fluid under machinery.
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