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cyclic pitch
cyclic pitch In most helicopters main rotor blade pitch
progressively increases from minimum (a very small)
angle when head-on to airstream (momentarily occupying
position of wing) to maximum 180° later (when in position
of wing trailing-edge-on to airstream); this makes blade
fall on advancing side of rotor and rise on retreating side,
effectively decreasing and increasing angle of attack to
even-out lift on both sides. This is also called feathering,
and results in blade flapping (see * control).
cyclic-pitch control Primary helicopter flight control.
Usually governed by stick, similar to aeroplane control
column, which in central position causes basic cyclic
variation as described above by tilting stationary and
rotating stars on rotor hub. Pilot demand is passed
through mixing unit and output tilts fixed star in desired
direction to superimpose additional cyclic variation
causing disc to tilt in desired direction to cause helicopter
to rotate about pitch or roll axis.
cyclic rate Rate at which automatic gun fires, expressed
in shots per minute, measured after maximum rate has
been attained and not necessarily attainable except for
brief periods.
cyclic stick Cyclic-pitch control stick.
cyclic testing Repeated application of supposed operating
cycle, usually of exceptionally severe nature, under
arduous environmental conditions to prove endurance or
life of hardware.
cycling Cyclic testing.
Cycloconverter Elegant method of generating constantfrequency
a.c., by commutating six phases of h.f. [over
1,600 Hz] to very precise 400 Hz three-phase.
cyclogenesis Development of a cyclone.
cyclogiro Aerodyne, never successfully achieved, lifted
and propelled by pivoted blades rotating about substantially
horizontal transverse axis as in paddle steamer.
cyclone Tropical revolving storm.
Cyclonite See RDX.
cyclostrophic force That experienced by wind following
CZI
curved isobars acting in addition to geostrophic force to
give resultant wind along isobar according to Buys
Ballot’s law. At Equator geostrophic force vanishes,
leaving pure cyclostrophic wind.
cyclostrophic wind As explained above, wind near
Equator with strong circular motion, such as a tornado.
Cyclotol Specially formulated high explosive, used
alone or with PBX-9500 series, to cause implosion trigger
(NW).
cyclotron Family of magnetic resonance particle accelerators,
many extremely large.
cyclotron resonance Motion of moving charged particle
in magnetic field on which is superposed alternating electric
field normal to magnetic field.
cyc/sec Cycles per second, SI unit is Hz.
CYI Canary Islands (AMR).
cylinder One unit of piston engine, or, specif.,
surrounding cylinder enclosing combustion space and
guiding piston.
cylinder block Single unit enclosing row of liquid-cooled
in-line piston engine cylinders.
cylinder head Usually removable top of piston engine
cylinder containing plugs, inlet/exhaust connections and
(except with sleeve valve) valves.
cylinder liner Hard abrasion-resistant lining inserted
into cylinder of light alloy or other soft material.
C yp Side force due to roll rate.
C yr Sideforce due to yaw rate.
Cytac Loran-C.
CY2KSS Center for year-2000 strategic stability
(US/R).
CZ Control-zone (US).
C z Normal force coefficient, C L cos A + C d sin A, where
A is angle of attack; rarely called C N , which is strictly
negative.
cZ Fore/aft magnetic VSI component.
CZCS Coastal zone colour scanner.
CZI Compressor-zone inspection.
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