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Netma
Netma NATO Eurofighter and Tornado Management
Agency.
net performance Gross performance factored to take
account of temporary variations (from whatever cause)
and pilot handling skill.
net propulsive force See net thrust.
net radiation factor Percentage of radiant energy
emitted by one surface or volume that is absorbed by
another surface or volume.
net shape Finished shape [many refinements, depending
on tolerances and which dimensions are chosen].
nettage decrement Percentage difference between gross
and net performance.
net thrust Fn, effective thrust of jet engine numerically
equal to change in momentum of fluids (air/gas and fuel)
passing through engine (plus, in engine operating with
choked nozzle, extra aeroydynamic thrust generated in
nozzle).
netting Electronically interlinking numerous related
stations, such as SAM launchers or battlefield communications
centres, which are dispersed randomly over a wide
area and move relative to each other.
net weight Loosely empty weight, but usually excluded
from aerospace usage.
net wing area Gross area minus projected plan area of
fuselage, nacelles over wing and other non-aerofoil parts.
network System of communications linking computers
and other management tools.
network carrier Large airline serving many cities or
countries, opposite of hub/spoke.
network centric warfare Radical new command, control
and communications systems, with every post, vehicle
[including airborne] and sensor interconnected. A core
objective is to find targets using multiple—possibly widely
dispersed—sensors and provide near-instaneous target
data.
network enabled capability Local or global linkage of
sensors, decision-makers and weapons in order to achieve
rapid and correct overwhelming effect.
neutral networks Loosely follow architecture of human
neurons and their dendritic connections; NNP is a pioneer
multiple instruction/multiple data neural processor.
neutral-angle intake An inlet whose mouth is shaped to
minimise variation of ram pressure with airspeed.
neutral area “A strip of ground of specified width
adjoining the sides of a runway” (B.S., 1940).
neutral axis Locus of points within structural member at
which bending imposes neither tension nor compression.
neutral burning Combustion of solid propellant grain in
which exposed surface [and thus thrust] remains almost
constant over burn-time.
neutral engine Main propulsion engine devoid of
dressing peculiar to either particular aircraft type or to left
or right installation in multi-engined aircraft, and thus
available for quick completion for desired installation.
neutral equilibrium Normally means that system
will tend to stay in most recently commanded attitude
or condition, without oscillation, unstable divergence or
recovery of previous condition.
neutral flame Neither oxidizing nor reducing.
neutral hole Aperture cut from sheet, esp. in wall of
internally pressurized container (usually taken to be cylindrical)
shaped so that peak stress around periphery is
minimised and stress in surrounding material is as if hole
NEZ
did not exist. Credited to E.H. Mansfield, RAE. Normally
approximates to ellipse, with minor axis parallel to
cylinder longtitudinal axis.
neutralized controls Usually taken to mean centralized.
neutralized track Air intercept code: target is ineffective
or unusable.
neutral point 1 Location of aircraft, esp. aeroplane, c.g.
at which longitudinal stability would be neutral [C m = 0];
rear extremity from which static margin is measured.
More strictly, stick-fixed ** is c.g. position at which stick
movement to trim a change in speed is zero; stick-free **
is c.g. position at which stick force to trim a change in
speed is zero.
2 Lagrangian point.
3 Any sky direction where polarization of diffuse (ie not
from specific source) radiation is zero.
neutral stability See neutral equilibrium.
neutrino Elusive small particle, rest mass 0, spin ½.
neutron Particle of atomic nucleus having no charge and
mass 1.6749286 × 10 –24 g (proton is 1.6726231 × 10 –24 g).
neutron bomb Enhanced-radiation weapon.
neutron radiography NDT method similar to X-ray
inspection and ‘photography’ but using beam of neutrons.
Nevatron Possible future gyro: magnetic field guides
atoms at near-zero temperature round 20-mm ring.
NEW 1 NATO electronic warfare [AC adds advisory
committee, TS training system].
2 Network-enabled warfare.
Newac NATO Electronic Warfare Advisory
Committee.
new blue Recruit (USAF).
Newhaven Visual marking of ground target (RAF
WW2).
new heading R/T for “that is my next routeing”.
newton SI unit of force, = 1 kg m s –2 = 10 5 dyn = 7.233
pdls = 0.224809 lbf = 0.10197 kgf; written without initial
capital, but symbol N.
Newtonian flow That in extremely rarified gas where
mean free path is in order of metres and hypersonic body
is surrounded by incident arriving molecules passing
between those bouncing off surface; also called free-molecule
flow.
Newtonian mechanics Those based on Newton’s laws of
motion, in which mass and energy are unrelated.
Newtonian speed of sound Relation a = √pρ where p is
pressure and ρ density.
Newtonian stress Fundamental shear stress in fluid,
du
given by law τ = µ ––
dy
where µ is fluid viscosity and u is
fluid velocity at distance y from fixed surface.
Newton’s laws Briefly: (1) body at rest remains at rest
unless acted upon by outside force, (2) change in motion
(momentum) is proportional to applied force, and (3) to
every action (force or change in momentum) there is equal
and opposite reaction.
Newts Naval electronic-warfare training system (USN).
Nex, NEX Next-generation (prefix, DoD).
Nexcom Next-generation air/ground communications
[P adds program] (FAA).
Nexrad Next-generation radar.
NEXST Next-generation supersonic transport.
Next NASA evolutionary xenon thruster.
Nexwos Next-generation weather-observing system
(FAA, 1995).
NEZ No-escape zone.
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