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Aerodynamics during slip to landing and stall characteristics.

Asked by: 2517 views Aerodynamics, Flight Instructor, General Aviation, Student Pilot

I just read a notes on sideslip and here is the excerpt to that note.

If an airplane in a slip is made to stall, it displays very little of the yawing tendency that causes a skidding stall to develop into a spin

i. The airplane in a slip may do little more than tend to roll into a wings level attitude

ii. Stall characteristics may even be improved

 

Can anyone explain me on this ?

 

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1 Answers

  1. Best Answer


    Skyfox on Apr 11, 2016

    If I remember correctly (and I may make a fool of myself for continuing if I’m totally wrong), an airplane in a slip is creating a sort of wind “shadow” on the wing that’s pointing away from the direction of slip. For example, say an airplane is in a side slip to the left with left aileron and right rudder. The fuselage and cowling of the airplane block the right wing’s root from a good airflow, disrupting and diminishing lift even at a low angle of attack with plenty of airspeed. If the angle of attack is increased towards the stalling point, that wing will stall more harshly than the wing that’s in the upwind position, in this example being the left wing. That would make the right wing drop back to a more wings level attitude.

    According to the Airplane Flying Handbook [FAA-H-8083-3B]:
    “Unlike skids, however, if an airplane in a slip is made to stall, it displays very little of the yawing tendency that causes a skidding stall to develop into a spin. The airplane in a slip may do little more than tend to roll into a wings level attitude. In fact, in some airplanes stall characteristics may even be improved.”

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