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Terms in this set (27)
a rearward, retarding force caused by
disruption of airflow by the wing, rotor, fuselage, and
other protruding objects. Drag opposes thrust and acts
rearward parallel to the relative wind.
the combined load of the aircraft itself, the
crew, the fuel, and the cargo or baggage. Weight pulls
the aircraft downward because of the force of gravity.
It opposes lift and acts vertically downward through
the aircraft's center of gravity (CG).
What is CG?
Center of Gravity
the forward force produced by the power
plant/propeller or rotor. It opposes or overcomes the
force of drag. As a general rule, it acts parallel to the
longitudinal axis. However, this is not always the case,
as explained later.
opposes the downward force of weight, is
produced by the dynamic effect of the air acting on
the airfoil, and acts perpendicular to the flightpath
through the center of lift.
What is AOA?
Angle of Attack
Induced drag is generated by the airflow circulation around
the rotor blade as it creates lift.
Parasite drag is present any time the helicopter is moving
through the air. This type of drag increases with airspeed. Non lifting components of the aircraft such as the rotor mast, tail, cabin, and landing gear.
Total drag for a helicopter is the sum of all three drag forces.
the length of the rotor blade from center of rotation to tip of the blade.
a straight line intersecting leading and trailing edges of the airfoil.
the length of the chord line from leading edge to trailing edge; it is the characteristic longitudinal dimension of the airfoil section.
Mean Camber Line
a line drawn halfway between the upper and lower surfaces of the airfoil.
Angle of Incidence
the angle between the chord line of a blade and rotor hub. It is usually referred to as blade pitch angle.
What is AOI?
Angle of Incidence.
What is Angle of Attack?
the angle measured between the resultant relative wind and chord line.
the front edge of an airfoil.
the speed and direction of the airfoil passing through the air.
defined as the airflow relative to an airfoil and is created by movement of an airfoil through the air.
the rearmost edge of an airfoil.
The downward flow of air through a rotor disk.
Resultant Relative Wind
Relative wind modified by induced flow.
on the mast is the center point and attaching point for the root of the blade.
the farthest outboard section of the rotor blade.
the inner end of the blade and is the point that attaches to the hub.
the change in blade incidence from the root to the outer blade
What is OGE
Out of Ground Effect
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