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31 Cards in this Set
- Front
- Back
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Who was the true inventor of the airplane?
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George Cayley
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Who designed and flew the first glider?
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Otto Lilienthal
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What year did the Wright brothers achieve flight?
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1903
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Four Fundamental principles of a flow field?
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Velocity, Pressure, Density, Temperature
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Which of the principles of a flow field are scalars and which are vectors?
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Scalar: pressure, density, temperature
Vector: Velocity |
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Explain what the hydrostatic equation means.
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As height changes, pressure changes.
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State the two forces of Aerodynamic Forces.
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Lift and Drag
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What must occur to achieve SLUF?
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Lift=Weight
Drag=Thrust |
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Which forces from SLUF are aerodynamic forces?
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Lift and Drag
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What needs to happen for flow to be incompressible?
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constant density
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Define a streamline.
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Imaginary line that its flow velocity vectors are tangent to the airflow
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Define a streamtube
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a collection of streamlines in a tube.
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Define steady flow.
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All variables are constant
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List Bournouli's assumptions.
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Steady Flow
Incompressible Flow Inviscid Flow |
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List 3 components of pressure.
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Dynamic Pressure
Static Pressure Total Pressure |
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List the physical meaning of continuity equation.
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What goes in= what comes out
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List the assumed density at the Indicated Air Speed.
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Sea Level on a standard day
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True or False: Inviscid flow exists in nature.
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False
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Why is it necessary to know the Position Error?
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To account for the installation error in the pitot tube
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NACA 2412
What do numbers mean? |
First #: Camber thickness
Second #: Location Third #: Max Thickness |
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What are ways to decrease leading edge flow separation?
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Leading Edge Extensions
Vortex Generators |
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List two types of viscous drag?
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Pressure Drag
Skin Friction |
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What is the transition point between laminar and turbulent flow?
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Critical Reynold's Number
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What are the effects of flow separation?
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Loss in Lift, Increase in Drag
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What is the center of pressure?
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the point where lift acts
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What is the Aerodynamic center?
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moment is independent of the angle of attack
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List two types of wing twists.
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Geometric
Aerodynamic |
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Is induced drag the result of creating lift?
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Yes
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From 2-D to 3-D, what occurs?
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Loss in Lift
Drag increases |
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List design techniques to reduce induced drag.
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Winglets (increases efficiency)
Increase the AR |
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What are the Four Pillars?
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Aerodynamics
Structures Propulsion Stability and Control |
