SIFT ARMY AVIATION INFORMATION
SECTION EXAM 2024-2205
A helicopter is a rotorcraft that can take off and land vertically, hover, and fly
forward, backwards, and sideways (laterally).
A thrust engine is an engine that generates power and sends it to the helicopter's
overhead and tail rotors (via one or more transmissions and drive shafts).
Fuselage – The main body of the helicopter.
Mast - A shaft extending from the top
The engine and gearbox of many helicopters are covered by a cowling on the
upper half of the fuselage.
Two to six rotor blades - ANSWER How many rotor blades are connected to
the mast via a rotor head?
Flybar - also known as a stabilizer bar.
Rotor systems include upper and lower swashplates, blade grips, control rods,
pitch and scissor links, teeter or coning hinges, pitch horns, and counterweights.
ANSWER What is the Function of Flybars?
ANSWER: What are the pilot's flight instruments and controls?
Avionics is a term that refers to electronics used for navigation,
communications, and aircraft systems.
guns control - ANSWER: How does a military helicopter pilot use guns from
the cockpit?
, Weight, lift, thrust, and drag are the four aerodynamic forces that act on a
helicopter when it is airborne.
ANSWER: Lift is the force that counteracts an aircraft's weight and causes a
helicopter to rise into the air and remain airborne.
Lift is created by airfoils - rotor blades in the case of helicopters - moving
through the air at a high enough speed to create a pressure differential between
the two sides of the airfoils.
Thrust - ANSWER is an aircraft's forward force generated by one or more
engines and converted into rotational motion in the case of helicopters via the
aforementioned components. _______ typically acts parallel to the aircraft's
longitudinal axis, but not always.
Drag, which opposes propulsion, is a rearward-acting force created by airflow
passing over the aircraft's structure and getting disrupted. ________ behaves in
a parallel to the relative wind.
What are the three types of drag? They are profile, induced, and parasitic.
Profile drag - The drag caused by the blades' frictional resistance increases. Skin
friction caused by surface defects, as well as form drag.
Induced drag is caused by air circulating around each rotor blade as it rotates,
creating lift; this circulation generates a vortex behind each blade.
Parasite drag is the drag produced by helicopter components and connected
equipment that do not contribute to lift, such as the fuselage, tail section, skids
or wheels, externally mounted engines, sensors, and weaponry.
Bernoulli's Principle - ANSWER Scientific Principle that energy cannot be
generated or destroyed, only its form can be modified, and the total energy of a
system does not rise or decrease.
SECTION EXAM 2024-2205
A helicopter is a rotorcraft that can take off and land vertically, hover, and fly
forward, backwards, and sideways (laterally).
A thrust engine is an engine that generates power and sends it to the helicopter's
overhead and tail rotors (via one or more transmissions and drive shafts).
Fuselage – The main body of the helicopter.
Mast - A shaft extending from the top
The engine and gearbox of many helicopters are covered by a cowling on the
upper half of the fuselage.
Two to six rotor blades - ANSWER How many rotor blades are connected to
the mast via a rotor head?
Flybar - also known as a stabilizer bar.
Rotor systems include upper and lower swashplates, blade grips, control rods,
pitch and scissor links, teeter or coning hinges, pitch horns, and counterweights.
ANSWER What is the Function of Flybars?
ANSWER: What are the pilot's flight instruments and controls?
Avionics is a term that refers to electronics used for navigation,
communications, and aircraft systems.
guns control - ANSWER: How does a military helicopter pilot use guns from
the cockpit?
, Weight, lift, thrust, and drag are the four aerodynamic forces that act on a
helicopter when it is airborne.
ANSWER: Lift is the force that counteracts an aircraft's weight and causes a
helicopter to rise into the air and remain airborne.
Lift is created by airfoils - rotor blades in the case of helicopters - moving
through the air at a high enough speed to create a pressure differential between
the two sides of the airfoils.
Thrust - ANSWER is an aircraft's forward force generated by one or more
engines and converted into rotational motion in the case of helicopters via the
aforementioned components. _______ typically acts parallel to the aircraft's
longitudinal axis, but not always.
Drag, which opposes propulsion, is a rearward-acting force created by airflow
passing over the aircraft's structure and getting disrupted. ________ behaves in
a parallel to the relative wind.
What are the three types of drag? They are profile, induced, and parasitic.
Profile drag - The drag caused by the blades' frictional resistance increases. Skin
friction caused by surface defects, as well as form drag.
Induced drag is caused by air circulating around each rotor blade as it rotates,
creating lift; this circulation generates a vortex behind each blade.
Parasite drag is the drag produced by helicopter components and connected
equipment that do not contribute to lift, such as the fuselage, tail section, skids
or wheels, externally mounted engines, sensors, and weaponry.
Bernoulli's Principle - ANSWER Scientific Principle that energy cannot be
generated or destroyed, only its form can be modified, and the total energy of a
system does not rise or decrease.
