SIFT Army Aviation Information Section Study Guide with Complete Solutions
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Course
SIFT
Institution
SIFT
SIFT Army Aviation Information Section
Study Guide with Complete Solutions
A Helicopter - Answer-Is a type of rotorcraft that is able to takeoff and land vertically, hover, and fly
forward, backward, and side to side (laterally).
Thrust engine - Answer-an engine that produces power and delivers...
Avionics - Answer✔✔-what are electronics used for navigation, communications and aircraft systems
term?
Weapons controls - Answer✔✔-How does the pilot use weapons from a military helicopter cockpit?
weight, lift, thrust, and drag - Answer✔✔-what are the four aerodynamic forces that act on a helicopter
when it is airborne?
Lift - Answer✔✔-what is the force that counteracts an aircrafts weight and causes a helicopter to rise
into the air and stay aloft.
Lift - Answer✔✔-is produced by airfoils - rotor blades, in the case of helicopters - that move through the
air at a speed sufficient to create a pressure differential between the two sides of the airfoils.
Thrust - Answer✔✔-is an aircraft's forward force, which is created by one or more engines, and is
transformed in the case of helicopters into rotary motion via the components mentioned. Generally,
_______ acts parallel to the aircrafts longitudinal axis, but not always.
Drag - Answer✔✔-opposes thrust; it is a rearward- acting force caused by airflow passing over the
aircraft's structure and becoming disrupted. ________ acts parallel to the relative wind.
Profile, induced and parasite - Answer✔✔-what are the three types of drag?
Profile drag - Answer✔✔-Drag created by the blades' frictional resistance increases. Consists of skin
friction created by surface imperfections and form drag.
Induced drag - Answer✔✔-Drag created by air circulating around each rotor blade as it spins and creates
lift; the circulation causes a vortex behind each blade.
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