Aircran
Publicat~ons
Pipcr
Comanche
250
(Early Model)
Section
-
1
General
SYMBOLS, ABBREVWTIONS
AND
TERMINOLOGY (Cont.)
Best Glide (Optimum)
The engine-out airspeed which results in the best glide ratio
BHP Brake Horsepower
-
The power developed at the propeller shaft of the engine measured in
customary US units.
BMEP Brake Mean Effective Pressure
-
The average pressure inside the cylinder of a
reciprocating engine during the power stroke, measured in the customary units of pounds per
square inch. Used as an index for a majority of items of engine output, efficiency and
operating limitations.
Bootstrap System
A
dynamic feedback system whereby an increase in the input power causes an
increase in the system output, which is returned to the input, which again affects the output,
etc.
A
bootstrap system
is
inherently unstable and requires slow and smooth control
operation.
CAS Calibrated Airspeed
-
The indicated airspeed of an aircraft corrected for position and
instrument error.
C.G. Center of Gravity
-
The point at which an aircraft would balance if suspended. Also, the
point at which the longitudinal, lateral and vertical axes all converge, and through which the
resultant force of gravity acts. Its distance from the reference datum is found by dividing the
total moment by the total weight of the aircraft.
C.G. Arm Center of Gravity
Arm
-
The arm obtained by adding the aircraft's individual moments
and dividing by the total weight.
C.G. Limits Center of Gravity Limits
-
The extreme center of gravity locations within which the
aircraft must be operated at a given weight.
CHT Cylinder Head Temperature
-
Temperature of an engine measured by a thermocouple
device installed at the cylinder head to determine engine cooling.
CID Cubic Inch Displacement
-
The volume of the cylinders of an internal combustion engine,
measured in customary
US
units. Equal to the area of the bore multiplied by the stroke times
the number of cylinders.
Climb Gradient The ratio of change in altitude during a portion of a climb to the horizontal
distance traversed in a given time interval. Climb Gradient is measured in feet per nautical
mile and equal to the rate of climb in feet per minute, times
60,
divided by ground speed in
knots.
Compressor
A
centrihgal air pump connected directly to the turbine, the purpose of which is to
increase the density of air to the induction system.
Critical Altitude The maximum altitude at which a normally aspirated engine can produce a
given horsepower, or a turbocharged engine can produce sea level power.
Copyright:
1993
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