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Kovar
Kovar Fe/Ni/Co alloy whose coefficient of thermal
expansion is close to that of glass.
Kp Kilopound, also called kip.
kp Kilopond, 1 kgf.
kPa Kilopascal[s], 1,000 N/m 2 , SI unit of pressure.
kph Incorrect abbreviation for kilometres per hour.
KPP Key performance parameter[s].
KPS 1 Kilobytes per second.
2 Kills per sortie.
3 Knowledge-processing system.
KPU Keyboard printer unit.
k Q Torque coefficient.
Kraken Knowledge-rich acquisition of knowledge from
experts who are non-logicians (USAF).
Kriegsmarine Navy (G, 1933-45).
KRL Khan Research Laboratories (Pakistan).
KRs & ACIs King’s Regulations and Air Council
Instructions (RAF ‘bible’ to 1952).
Krueger Not Krüger, leading-edge flap normally flush
with undersurface, hinged down and forward to give bluff
leading edge on high-speed profile.
krypton Kr, inert gas, density 3.7x10 -3 , BPt -52°C.
Ks Factor of takeoff distance.
K S See K(17).
k s Stiffness of spring or shock absorber.
KSA Royal Swedish aero club [186 clubs, SE-16102
Bromma] (Sweden).
KSC 1 John F Kennedy Space Center, includes Capes
Canaveral and Kennedy, Merritt Island and the ETR.
2 Most confusing, kg/sq cm.
KSFC Thousands of simulated flight-cycles.
KSI, ksi Most confusing, thousands of pounds per
square inch.
K σ Gust-alleviation factor related to wing chord.
K su Spin-up factor on wheel hitting runway, = f (t su /t n ),
spin-up time and natural period of gear in fore/aft vibration.
KT Geometric stress-concentration factor.
kT Kiloton[nes].
k T 1 Thrust coefficient.
2 Stiffness of tyre [tire].
kt Knot[s].
KTAS Knots true airspeed.
KTD Key-transfer device.
KTN Knowledge-transfer network.
kts, KTS See kt.
Küchemann carrot See shock body.
Küchemann ‘Coke bottle’ Wasp-waisted fuselage of
kΩ
high-subsonic aircraft with sides following local streamlines
past wing. Not area ruled.
Küchemann tip Low-drag wingtip following outwardcurved
streamlines, with large-radius curve from leading
edge to corner at trailing edge.
kulbit 1 A circle (R).
2 Somersault [Frolou], stopping motionless in vertical
nose-up attitude whilst using vectoring to rotate in
azimuth 360°.
3 Less dramatic, in horizontal or vertical flights point
nose around circle centred on longitudinal axis.
KUR Key user requirement[s].
Kussner function A correcting factor for angle of attack
as an aerofoil penetrates a gust, because the α changes
gradually, not instantaneously, symbol ã.
Kutney bump Drag-reducing bulge on inner side of
pylon/wing junction.
Kutta condition The strength of the circulatory vortex on
the underside of the wing is equal and opposite to that on
the upper surface, Γ l Γ u [sometimes written γ l + γ u ] = 0
Kutta-Zhukovsky Formula giving lift per unit span as
KρV (circulation density velocity) for twodimensional
irrotational inviscid flow.
KV Kill vehicle.
kV Kilovolt[s].
kVA Kilovolt-ampere[s].
KVAR kVA-reactive, measure of reactive power.
KVDT Keyboard visual display terminal.
KW 1 Kinetic warhead.
2 Key word; IC and OC add in, or out of context.
kW Kilowatt[s].
kWh Kilowatt-hour[s].
KWS Kampfwertsteigerung (G).
Kx, Ky ‘Engineering’ drag and lift coefficients.
k x , k y Respectively, helicopter rotor longitudinal and
lateral inflow gradients.
kymograph 1 See barograph.
2 Smoked-paper chart recording aircraft angular
movements (arch.).
Kyoto Protocol The first international agreement on a
[small] reduction in greenhouse-gas emissions [38 nations]
(1997).
kytoon Combination kite + balloon or kite-shaped
balloon.
kZ Vertical component of VSI (1).
KZB Drop tank (G).
KZO Mini-RPV for target detection and location (G).
kk 1,000 1,000 pixels.
kΩ Kilohm.
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