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hydrograph
hydrograph Hydrometer hard-copy output.
hydrokinetics Science of liquids in motion.
hydrolapse Rate of decrease of atmospheric water
vapour with altitude.
hydromagnetics See MHD.
hydromechanical logic Performed with mechanical
elements wherein information exists as hydraulic
flows/pressures.
hydromechanical metering unit Fuel metering unit.
hydrometer Instrument for determining density of
liquids.
hydrometeor 1 Any atmospheric water in solid or liquid
form; all precipitation, fog, dew, frost etc.
2 Phenomena dependent upon (1).
hydrophobic Rain-repellant.
hydrophilic Affinity for water, so acts as dessicant
(various spellings).
hydroplane Light boat which skims water surface on
planing bottom when at high speed; erroneously misused
for seaplane and/or hydrofoil.
hydroport Inland airport for marine aircraft.
hydropress Diverse family of hydraulic presses widely
used in aerospace with large-area platen on which are
mounted large or multiple tools around which sheet is
shaped by rubber pad or mating tools.
hydroskis Planing surface, usually in left/right pair and
retractable, used for takeoff and landing of certain marine
aircraft; have little buoyancy, so ski aircraft rests on water
like flying boat when at rest.
hydrosphere Water resting on or within crust of Earth or
other body, excluding that in atmosphere.
hydrostatic bearing Spinning shaft, sphere or other mass
is supported (usually radially and axially) by filtered gas
or liquid dynamic reaction, eliminating contact between
fixed and moving solid surfaces.
hydrostatic drive Transmits power, usually between
rotating shafts, by pumping hydraulic fluid round closed
circuit; both pump and motor usually have stroke or
output infinitely variable down to zero, giving perfectly
flexible dynamic link from zero to maximum output
power.
hydrostatic equation Applies when secondary effects
(Earth curvature, friction, coriolis etc) ignored, leaving
dp/dz ρg where p is pressure, z geometric height and
ρ density.
hydrostatic extrusion Advanced technique for extrusion
of steels and other materials, usually at room temperature
by forcing through die under extreme hydraulic pressure.
hydrostatic fuze Triggered by depth-dependent water
pressure.
hydrostatic test Test of container (fuselage, solid rocket
case) under high pressure using water or other liquid to
minimize stored energy.
hydrovane One meaning is a patented form of hydrofoil
intended to facilitate emergency water alighting of landplane.
Hydrus FBMS ship/shore communications system.
Hydulignum Trade name (Hordern-Richmond) for
densified wood.
Hydyne Storable rocket fuel in various formulations
based upon 60% UDMH and 40% diethylenetriamine.
hyetograph 1 Recording rain gauge.
2 Annual rainfall chart.
hyperspectral
Hyfil Trade name for family of CFRP raw materials
marketed in standard forms or used for inhouse production
(Rolls-Royce).
Hyflex Hypersonic flight experiment.
HyFly Programme of Mach-6 research (Darpa/ONR).
HYE High-yield explosive.
hygrograph 1 Output from a recording hygrometer.
2 Instrument for recording humidity, traditionally with
pen positioned by bundle of stretched human hair.
hygrometer Determines atmospheric humidity (strictly,
wet and dry bulb * is psychrometer).
hygroscopic Eager to absorb moisture.
Hy-Jet/I,II,III,IV Ester-based non-inflammable
hydraulic fluids (Chevron).
Hy-Lite Hyperspectral long-wave imager for the
tactical environment.
Hylite British titanium alloys (+ Sn, Zr, Al); creepresistant.
H y MIC Hybrid micro integrated circuit.
hyperabrupt Device, eg diode, tailored to most rapid
possible action.
hyperacoustic zone Region above 100 km (62 miles)
where mean free path approximates to wavelengths of
sound; limit of sound propagation.
hyperbaric 1 Having atmospheric pressure or oxygen
concentration greater than normal sea-level.
2 Internal body pressures greater than ambient.
hyperbola Conic section obtained by plane cutting both
nappes (normal right circular cone and its mirror-image
inverted above); locus of points whose distances from two
foci have constant difference, standard equation
x 2 /a 2 –y 2 /b 2 = 1. Because of constant difference in distance
from two foci, possible to base families of navaids on
keyed radio emissions from two fixed stations.
hyperbolic navaids Based upon synchronized emissions
from fixed ground stations, often called master and
slave(s), which are received by aircraft at time differences
which yield lines of constant time (ie range) difference in
form of hyperbolic position lines. First were Gee, Loran
and Decca, later developed to give instantaneous readout
of position or moving-map display.
hyperbolic error That due to assumption that waves
received at all antennas of an interferometer baseline are
travelling in parallel directions.
hyperbolic frequencies Measured in several tens of GHz.
hyperbolic re-entry At hyperbolic speed.
hyperbolic speed Sufficient to escape from Solar System;
on Earth trajectory away from Sun about 40,597 km/h,
25,226 mph.
hypergolic Of rocket propellants, those which ignite
spontaneously when mixed.
hypermetropia Long-sightedness.
hypermixing nozzle In ejector-lift system, row of nozzles
which alternately deflect jets in opposite directions to
create large vortices promoting rapid mixing.
hyperoxia Excess oxygen in the blood.
hypersat Loose term for advanced small satellite[s].
hypersonic Having Mach number exceeding 5 [another
authority, M8 to M12].
Hypersonic National Plan Co-ordinates DoD, NASA,
industry and academia (US).
hypersound Frequency greater than 10 9 Hz.
hyperspectral Operating in several electromagnetic
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