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Topic: Drag

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	Encyclopedia :: encyclopedia : Wave drag (Site not responding. Last check: 2007-10-22)
		Wave drag is an aerodynamics term that refers to a sudden and very powerful form of drag that appears on aircraft flying at high-subsonic speeds.
		Wave drag is caused by the formation of shock waves around the aircraft.
		One common solution to the problem of wave drag due to the wings was to use a swept-wing, which had actually been developed before WWII and used on some German wartime designs (none of which saw service).
	www.hallencyclopedia.com /Wave_drag (747 words)

	Form Drag Encyclopedia Articles @ HotAndCold.com (Hot and Cold) (Site not responding. Last check: 2007-10-22)
		In aviation, induced drag tends to be greater at lower speeds because a high angle of attack is required to maintain lift.
		Interference drag is also create by closely spaced parallel surfaces such as the wings of a biplane or triplane, or the facing surfaces of an external load (such as an external fuel tank or weapon) and the fuselage or wing.
		Skin friction is a function of the interaction between the fluid and the skin of the body, as well as the wetted surface, or the area of the surface of the body that would become wet if sprayed with water flowing in the wind.
	www.hotandcold.com /encyclopedia/Form_drag (680 words)

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