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  • Chapter 5: Aerodynamics of Flight › Load Factors › Load Factors and Stalling Speeds

    Load Factors and Stalling Speeds Any aircraft, within the limits of its structure, may be stalled at any airspeed. When a sufficiently high AOA is imposed, the smooth flow of air over an airfoil breaks up and separates, producing ... abrupt change of flight characteristics and a sudden loss of lift, which results in a stall. A study of this effect has revealed that an aircraft’s stalling speed increases in proportion to the square root of the load factor…

  • Chapter 5: Aerodynamics of Flight › Stalls

    stated above, it does not completely stop producing lift. In most straight-wing aircraft, the wing is designed to stall the wing root first. The wing root reaches its critical AOA first making the stall progress outward toward the wingtip ... having the wing root stall first, aileron effectiveness is maintained at the wingtips, maintaining controllability of the aircraft. Various design methods are used to achieve the stalling of the wing root first. In one design, the wing is “twisted…

  • Chapter 7: Aircraft Systems › Turbine Engines › Compressor Stalls

    Compressor Stalls Compressor blades are small airfoils and are subject to the same aerodynamic principles that apply to any airfoil. A compressor blade has an AOA that is a result of inlet air velocity and the compressor’s rotational velocity ... combine to form a vector, which defines the airfoil’s actual AOA to the approaching inlet air. A compressor stall is an imbalance between the two vector quantities, inlet velocity, and compressor rotational speed. Compressor stalls occur when the compressor…

  • Chapter 5: Aerodynamics of Flight › Boundary Layer Separation › Sweepback

    words, the use of sweepback “softens” the force divergence. A disadvantage of swept wings is that they tend to stall at the wingtips rather than at the wing roots. [Figure 5-69] This is because the boundary layer tends ... tips of a swept wing are on the aft part of the wing (behind the CL), a wingtip stall causes the CL to move forward on the wing, forcing the nose to rise further. The tendency for tip stall…

  • Chapter 5: Aerodynamics of Flight › Load Factors › Stalls

    Stalls The normal stall entered from straight-and-level flight, or an unaccelerated straight climb, does not produce added load factors beyond the 1 G of straight-and-level flight. As the stall occurs, however, this load factor ... load on the wings and raise the pilot from the seat) may be produced. During the pull up following stall recovery, significant load factors are sometimes induced. These may be further increased inadvertently during excessive diving (and consequently high airspeed…

  • Chapter 5: Maintaining Aircraft Control: Upset Prevention and Recovery Training › Stalls › Common Errors

    accelerated stall by pulling too fast on the controls during a power-off or power-on stall entry. 4. Inability to recognize an impending stall condition. 5. Failure to take timely action to prevent a full stall during the conduct of impending stalls. 6. Failure to maintain a constant bank angle during turning stalls. 7. Failure to maintain proper coordination with the rudder throughout the stall and recovery. 8. Recovering before reaching…