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Refer to figure.
Point number 1 in the figure indicates which flight state?

  • A

    Stall

  • B

    Inverted flight

  • C

    Best gliding angle

  • D

    Slow flight

Refer to figure.
A method to represent the variation in drag is to plot the variation in Drag Coefficient (CD) with the corresponding aircraft Lift Coefficient (CL). This plot is known as a Drag Polar and provides a snapshot of the aircraft's performance for the entire flight envelope (at a given atmospheric condition and altitude). Dividing the CL by the drag coefficient CD results in a value known as the Lift-to-Drag Ratio or the aerodynamic efficiency.

Number 1 represents flight with negative CL at low CD and refers to an Inverted flight.

Number 2 represents flight with zero Angle of Attack and CL at minimum Drag Coefficient. Refers to a symmetrical airfoil with zero Angle of Attack which produces no lift and drag is only parasite caused from shape.

Number 3 represents flight with low lift at minimum CD.

Number 4 represents the flight of the best gliding angle.

Number 5 represents flight at a Critical Angle of Attack, slow flight. Maximum CL with high CD.

Number 6 represents flight at stall. No lift is produced at maximum CD.

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