The propeller blades produce a rotating slipstream tube with a diameter equal to that of the propeller disc and a helicity that increases as forward speed increases.
VENTURI TUBE - A small, hourglass-shaped metal tube, usually set laterally on a fuselage in the slipstream to create suction for gyroscopic panel instruments. Now outdated by more sophisticated means.
affect the tilt of the rotor are a tilting hub (Cierva), swashplate (Air & Space 18A), or servo-flaps (Kaman SAVER). A rudder provides yaw control. On pusher configuration autogyros, the rudder is typically placed in the propeller slipstream to ...
 See also: Performance, Landing, Drag, Altitude, Power
  
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