Robinson 44 Definitions and Abbreviations (5/17/2024) Flashcards
Vh
Stabilized level-flight speed at maximum continuous power.
The maximum speed that the helicopter can fly to ensure structural integrity and stability.
KIAS
Knots Indicated Airspeed is speed shown on the airspeed indicator.
KCAS
Knots Calibrated Airspeed is speed shown on the airspeed indicator corrected for instrument and position error.
KTAS
Knots True Airspeed is airspeed relative to undistributed air. It is KCAS corrected for pressure altitude and temperature.
BHP (Name and definition)
Brake Horsepower, Actual power output of the engine.
“brake”denotes the type of dynamometer that is used to access engine output at the crankshaft.
MAP (Name and definition)
Manifold Absolute Pressure, is the absolute pressure in the engine intake manifold
MCP (name)
Maximum Continuous Power
TOP (name)
Takeoff Power (or 5-minute power)
Critical Altitude
Maximum altitude at which full throttle produces maximum allowable power
TOGW
Takeoff Gross Weight
Reference Datum (location on the R44)
100 inches forward of the main rotor shaft
Arm
Horizontal distance from a reference datum to the CG of an item
Moment
Weight of an item multiplied by its arm
Useful load
Difference between maximum gross weight and basic empty weight
OAT
Outside Air Temperature
CAT
Carburetor Air Temperature
CHT
Cylinder Head Temperature
GPH
Gallons Per Hour
AGL
Above Ground Level
IGE
In Ground Effect
OGE
Out of Ground Effect
ALT
Alternator
Station
A fore-and-aft location along the helicopter fuselage usually given in terms of distance in inches from the reference datum.
Center of Gravity (CG)
The point at which a helicopter would balance if suspended. Its distance from the reference datum is found by dividing the total moment by the total weight of the helicopter.
CG Arm
The arm from the reference datum obtained by adding the helicopter’s individual moments and dividing the sum by the total weight.
CG Limits
The extreme center gravity locations within which the helicopter must be operated at a given weight.
Usable Fuel
Fuel available for flight planning.
Unusable Fuel
Fuel remaining after a runout test has been completed in accordance with government regulations.
Standard Empty Weight
Weight of a standard helicopter including unusable fuel and full operating fluids (i.e. hydraulic, engine oil, etc.).
Basic Empty Weight
Standard empty weight plus weight of installed optional equipment.
Payload
Weight of occupants, cargo, and baggage.
Anything that is paying to be on the aircraft.
Useful Load
Difference between maximum takeoff weight and basic empty weight.
Vy
Speed for best rate of climb
The airspeed at which the helicopter will get to a specific altitude in the shortest amount of time.
Vne
Speed never exceed
MSL Altitude
Altitude above mean sea level, indicated by the altimeter (corrected for instrument error)
Pressure Altitude
Altitude indicated by the altimeter (corrected for instrument error) when the barometric subscale is set to 29.92
Density Altitude
Pressure altitude, corrected for non-standard temperature
ISA
International Standard Atmosphere exists when pressure is 29.92 and temperature is 15 C
What is centrifugal force?
Pulls the blades outward
What is centripetal force?
Pulls you inward (the moon is orbit because of this)
