Shared Flashcard Set

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BMA 5
Aircraft basics and aerodynamics
41
Aviation
Not Applicable
03/06/2012

Term
 ________ use buoyancy to float in the air in much the same way that ships float on the water
Definition
 Aerostats
Term
 What two purposes does the fuselage serve?
Definition
 1- Carries payload2- holds control and stabilization
Term
 What is a setback from having a straight wing?
Definition
 Loses a lot of lift due to wingtip vortices
Term
 What is an advantage of having swept wings?
Definition
 They provide yaw stability
Term
 ________ are symmetrical triangular wings designed to fly at transonic or supersonic speeds
Definition
 Delta
Term
 What is a drawback to delta wings in regards to efficiency?
Definition
 It's shape creates a very small speed range in which it can operate at its peak efficiency
Term
 The _______ is an aviation term used to describe the tail portion of an aircraft
Definition
 Empennage
Term
 What does the empennage consist of?
Definition
 entire tail assembly:-Vertical stab-Horizontal Stab-trim devices-rudder-part of the fuselage where it's all attached
Term
 The two types of landing gear are:
Definition
 Fixed and retractible
Term
 Which law is this?"In the absence of forces, a body at rest will stay at rest, and a body at a constant velocity in a straight line continues to do so indefinitely"
Definition
 Newton's first law
Term
 Which law is this?"When a force is applied to an object, it accelerates. The acceleration is in the direction of the force and proportional to its strength, and also inversely proportional to the mass being moved"
Definition
 Newton's second law
Term
 Which law is this?"For every action, there is an equal but opposite reaction"
Definition
 Newton's third law
Term
 Which law is this?"The pressure of a fluid (liquid or gas) decreases as the speed of the fluid increases
Definition
 Bernoulli's Principle
Term
 The differential pressure between the upper and lower part of the wing creates ______
Definition
 lift
Term
 What does this describe:The component of the aerodynamic force which is perpendicular to the relative wind
Definition
 Lift
Term
 How can a pilot control air density?
Definition
 By flying at a different altitude
Term
 How can a pilot control True Airspeed?
Definition
 By changing the speed of the flight
Term
 How can a pilot change the coefficient of lift?
Definition
 By varying the angle of attack
Term
 What three things in the Lift equation can a pilot control?
Definition
 True airspeed, coefficient of lift, air density
Term
 Explain what a critical angle of attack is. What happens when it is exceeded?
Definition
 Where an airfoil stops generating lift. The aircraft stalls
Term
 _____________ is a measure of the curvature of an airfoil
Definition
 Camber
Term
 In relation to the CG, where does the center of lift need to be to have a positively stable aircraft?
Definition
 aft of the CG
Term
 What aircraft axis extends from the front to the rear of the aircraft? When there is motion about this axis what is the aircraft doing?
Definition
 Longitudinal axis, roll
Term
 What aircraft axis extends crosswise left and right? When there is motion about this axis what is the aircraft doing?
Definition
 Lateral; Pitch
Term
 What aircraft axis extends upward and downward? When there is motion about this axis what is the aircraft doing?
Definition
 Vertical, Yaw
Term
 ________ control rotation about the longitudinal axis
Definition
 Ailerons
Term
 _______ controls rotation about the lateral axis
Definition
 Elevator
Term
 ________ controls rotation about the vertical axis
Definition
 Rudder
Term
 ______ occurs when the left and right wing experience different amounts of lift due to aileron deflection when rolling the aircraft
Definition
Term
 Adverse yaw is countered by applying ________
Definition
 rudder in the direction that the aircraft is rolling
Term
 What are the four forces acting on an aircraft
Definition
 Lift, weight, drag and thrust
Term
 _________ is defined as the force acting on an aircraft during flight that opposes thrust
Definition
 drag
Term
 ____ drag is caused by friction and form drag
Definition
 Parasite
Term
 ________ drag is the drag due to lift production
Definition
 induced
Term
 As velocity increases, _____ drag decreases sharply and ____ increases sharply.
Definition
 induced, parasite
Term
 You must include ____ drag when you are in the transonic region
Definition
 wave
Term
 A ___ is a sudden reduction in the lift forces generated by an airfoil
Definition
 stall
Term
 The easiest spin to get out of is ___
Definition
 an inverted spin
Term
 ___________ is the maximum speed at which the pilot can use full, abrupt control movement without overstressing the airframe
Definition
 Instantaneous corner velocity (Maneuvering speed)
Term
 The angle between the relative wind and the chord line is called ____
Definition
 the angle of attack
Term
 ____ drag is a product of an increase in lift
Definition
 induced
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