Test Bank Solution Manual for Helicopter Private Pilot Rated 100%
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Course
Private pilot
Institution
Private Pilot
Test Bank Solution Manual for Helicopter Private Pilot Rated 100%
What is an airfoil? - Answers Is any surface producing more lift than drag when passing through the air ar a suitable angle.
Describe the leading edge of an airfoil? - Answers It lead the airfoil through the air. Rounded shape on ...
Test Bank Solution Manual for Helicopter Private Pilot Rated 100%
What is an airfoil? - Answers Is any surface producing more lift than drag when passing through the air
ar a suitable angle.
Describe the leading edge of an airfoil? - Answers It lead the airfoil through the air. Rounded shape on a
helicopter.
Describe the trailing edge of an airfoil? - Answers It trails behind the leading edge. Small tipped shape on
a helicopter.
What are the two types of rotor blades? - Answers Symmetrical and asymmetrical.
Describe the upper and lower cambers of each rotor blade type. - Answers Symmetrical- upper and
lower cambers are the same shape.
Asymmetrical- upper and lower cambers are not the same.
What is the cord line on an airfoil? - Answers It is an imaginary line from the leading edge to the trailing
edge of an airfoil.
What is the plane of rotation on an airfoil? - Answers The actual plane the rotor blade is moving through
the air.
Define relative wind. - Answers It is airflow relative to an airfoil.
What is angle of attack? - Answers It is the angle between the airfoil cord line and the resultant relative
wind.
What is induced flow (downwash)? - Answers Downward flow of air. Most pronounced at a hover with
no wind.
Describe the mechanical angle AKA pitch angle or angle of incident. - Answers It is the angle between
the cord line of a main or tail rotor blade and it's rotor disk.
Describe how an airfoil produced lift. Venturi and Bernoulli's - Answers Venturi - velocity is increased as
static pressure is decreases.
Bernoulli's - as air speed increases pressure decreases. (Low pressure on top of airfoil and high pressure
on bottom of airfoil).
What percentage of lift is achieved from Bernoulli's principle? - Answers 70%. The rest is from Newton's
third law.
, Describe Newton's third law of motion. - Answers For every action there is an equal and opposite
reaction.
What percentage of lift comes from Newton's third law? - Answers 30%
Describe parasite drag. - Answers Is the non lifting components of the helicopter. (Cabin, rotor mast, tail,
landing gear). It is present any time the helicopter is moving through the air.
Describe induced drag. - Answers It is generated by airflow circulation around the rotor blade as it
creates lift. AKA a by product of lift.
What are the two types of profile drag? - Answers Form drag
Skin friction
Describe form drag. - Answers It results from the turbulent wake caused by separation of airflow from
the surface of a structure. AKA the design of the airfoil, or object.
Describe skin friction. - Answers It is caused by surface roughness.
How do you get your total drag curve? - Answers Average all drags together.
The best rate do climb for an R-22 is? - Answers 53 knots.
How is drag considered by the manufacturer when determining the best rate of climb and autorotative
decent speeds? - Answers By averaging all of the drags and determining the total drag curve.
What are the 4 forces acting upon an aircraft? - Answers Lift
Weight
Thrust
Drag
Describe lift? - Answers Lift is the force that acts upward on the helicopter. Opposes weight.
Describe weight. - Answers Weight is the force of gravity that pulls down on the helicopter. It opposes
lift.
Describe thrust. - Answers It is the force that propels the aircraft in a particular direction. It opposes
drag.
Describe drag. - Answers It is the force that resists movement in any direction. It opposes thrust.
What is translating tendency? - Answers tendency of a single rotor helicopter to drift laterally while
hovering. Also called tail rotor drift.
What are the three elements of blade coning? - Answers Weight
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