U. S. Centennial of Flight - History of Flight

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Images from: Theories of Flight (Aerodynamics)

	Types of propellers Credit - NASA
	Blade rotation produces thrust and torque Credit - NASA
	Pitch of propeller blades Credit - NASA
	Propeller terminology Credit - NASA
	Use of pitch control Credit - NASA
	Aircraft with contrarotating blades Credit - NASA
	Helicopter rotor configurations Credit - NASA
	Helicopter forward motion Credit - NASA