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Extra resources for Introduction to Helicopter Aerodynamics Workbook CNATRA P-401
When transitioning to forward flight the rotor outruns this continuous recirculation of old wingtip vortices and begins to work in relatively undisturbed air. Moreover, the mass airflow through the rotors becomes more horizontal as airspeed increases (see figure 3-17). Both effects combine to cause a sharp decrease in induced flow, induced drag and, therefore, power required. Depending on wind conditions, the onset of translational lift and ground vortex may or may not be noticed or encountered during transition to forward flight.
Autorotation, however, does not usually occur after entering vortex ring state. It usually follows an engine failure if the pilot initiates corrective action in a timely manner. This action centers on meticulous energy management focusing on rotor RPM and forward airspeed. AUTOROTATION ENTRY Once the engine selects the most convenient time and place to cease working, the power required for flight, now autorotative flight, must come from another source. This energy comes from the rate of decrease in potential energy as the helicopter loses altitude.
_________________________is the self-sustaining rotation of the rotor blades in unpowered flight. 2. For unpowered flight, induced flow is perpendicular/parallel to the tip-path-plane and comes from above/below the rotor disk. 3. Pro-autorotative force is the vertical/horizontal component of lift/profile drag. 4. _____________________________ 5. The three conditions required to enter an autorotation are____________, ____________, and ______________. 6. ____________________ ________________________________________ 7.