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251(e)2). It follows then that as altitude increases manoeuvrability becomes increasingly restricted and the margins to both the high and low speed buffets are reduced. In good weather this is of little consequence, however, in bad weather it has great significance because of the possibility of turbulence disturbing the ‘status quo’ and requiring correction which becomes increasingly more difficult as altitude increases. As shown at Figure 1-20 and Figure 1-21. Chapter 1 Page 38 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Aerodynamics FIGURE 1-20 Chapter 1 Page 39 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Aerodynamics FIGURE 1-21 Chapter 1 Page 40 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Aerodynamics Descending Flight 28.

Although a warning device is fitted to the aeroplane which activates at this low speed, it is unlikely that the pilot would allow the speed of the aeroplane to fall to this speed inadvertently. However, it is possible to inadvertently exceed the VMo/MMo and encounter the highspeed buffet. This increase in speed may be caused by gust upsets, unintentional control movement, passenger movement, levelling off from a climb or a descent from Mach to airspeed limit altitudes. For such an eventuality a high-speed aural warning device is fitted to most aeroplanes and additionally a maximum speed needle on the airspeed indicator shows VMo up to the altitude at which VMo=MMo where the datum becomes MMo.

For a descent at a constant angle, the lift/drag ratio will remain constant. In Figure 1-23 the AB lift/drag ratio is represented in triangle ABC as -------- . It can be seen that triangle EFG is similar to BC dis tan ce travelled triangle ABC, therefore the lift/drag ratio can be represented by the -------------------------------------------- . Provided the height glide angle remains constant then the lift/drag ratio will remain constant. Chapter 1 Page 43 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Aerodynamics FIGURE 1-23 L/D Ration v Height/Distance in a Glide Chapter 1 Page 44 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Aerodynamics 30.

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Aeroplane Performance Tutorial - PPSC


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