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20 Cards in this Set
- Front
- Back
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Interference Drag
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function of construction/design of a/c; Caused by pressure differentials where wings and tail components join the fuselage. Also where engine nacelles join wings or fuselage. Can be minimized by good design techniques.
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Friction Drag
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Molecular level; happens when any fluid passing over any surface
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Form Drag
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related to shape of object
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Parasite Drag, list three main of these drags...
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Interference, friction, form drag
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Parasite drag, what is the most common source of configuration change?
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landing gear
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______ changes have the greatest effect on drag.
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Airspeed
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Induced Drag
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lift production of wing; like two vortices attached to back of wing; physical property of wing;wing tip vortices start it, upwash, movves relative wind; greatest at wing tip; least near wing root
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drag do to lift
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induced drag
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Induced Drag Equation
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wings with high aspect ratio have lower induced drag than wings with low aspect ratio for the same wing area. So wings with a long span and a short chord have lower induced drag than wings with a short span and a long chord
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F 18 have low aspect ratio produce more _____ drag
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induced
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Big Aspect Ratio small
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induced Drag
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long, thin wings have low _____ drag
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induced
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Total Drag Equation
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coefficient of drag, air density, velocity squared, area--can be any area
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An elliptical wing produces the (Least/Most) amount of drag for a subsonic (slower speed of sound) aircraft
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least
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_____ has benefits both in reduced drag and in construction
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Taper
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Stall patterns: _____ wing - stalls evenly throughout the span; does not give much warning. Ailerons may be rendered ineffective
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Elliptical
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Stall patterns: ______ wing, stalls begin at the root and moves outward. Lots of warning. Ailerons effective throughout the stall.
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Rectangular
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Moderate taper- close to the _____ wing.
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elliptical
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_____ Taper- Tip stalls first. No warning. Ailerons blanked out. Design features can control these tendencies and render the wing sable with adequate stall protection.
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High
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winglets:
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8-10% fuel savings, made of composite material
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