BSFC
Cavitation
ColdSoaking
Corrosion
CriticalAltitude
Density Altitude
DynamicCondition
E.G.T.
ExhaustBack Pressure
Four Cycle
FuelInjection
Gallery
Gallingor Scuffing
Hg"
Heat Soaked
Humidity
ImpulseCoupling
LeanLimit Mixture
Brake Specific FuelConsumption. Fuelconsumptionstated inpounds per hour
per brake horsepower. For example, an engine developing
300
horsepower
while burning
150
poundsof fuelper hour, has a BSFCof
.5.
Fuel
Qmsmwtionin PPH
5
-
-.
BrakeHorsepower
Formationof partialvacuums in aflowing liquid as a result of the separation of
itspart.
Prolonged exposure of an object to cold temperatures so that its temperature
throughoutapproachesthat of ambient.
Deteriorationof a metalsurfaceusuallycausedby oxidationof the metal.
"CriticalAltitude"meansthe maximumaltitudeat which, instandardatmosphere,
it ispossible to maintain,at a specified rotationalspeed, a specified power or a
specifiedmanifoldpressure. Unlessotherwise stated.
Altitude as determinedbypressurealtitude andexistingambienttemperature. In
StandardAtmosphere (IAS)density andpressurealtitudesareequal. Foragiven
pressurealtitude,the higherthetemperature, the higherthe density altitude.
Aterm referringto propertiesof a body in motion.
Exhaust GasTemperature. Measurementof this gastemperatureissometimes
usedas an aidto fuel management.
Oppositiontotheflow of exhaustgas, primarilycausedby the size andshapeof
the exhaust system. Atmospheric pressure also affectsbackpressure.
Short for "Four Stroke Cycle." It refers to the four strokes of the piston in
completing a cycle of engine operation (Intake, Compression, Power and Ex-
haust).
A processof meteringfuel intoan engine by means otherthanacarburetor.
A passagewayinthe engine or subcomponent. Generallyone throughwhich oil
isflowed.
Excessivefrictionbetweentwo metalsurfacesresultinginparticlesof the softer
metalbeingtorn away and literallyweldedto the harder metal.
Inchesof Mercury.
A
standardfor measuring pressure, especially atmospheric
pressureor manifoklpressure.
Prolonged exposure of an object to hot temperature so that its temperature
throughoutapproachesthat of ambient.
Moisture in the atmosphere. Relative humidity, expressed in percent, is the
amountof moisture(watervapor)inthe aircomparedwiththe maximumamount
of moisturethe aircouldcontain at agiventemperature.
A mechanicaldevice usedinsome magnetosto retardthe ignitiontiming and
providehighervoltage at crankingspeeds for starting.
The leanest mixtureapprovedfor any givenpowercondition. Itisnot necessarily
the leanest mixtureat which the engine willcontinue to operate.
