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#1
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"Wayne" writes:
Since the airspeed indicator (pitot tube) is pointed the same as the wing, then "indicated airspeed" does mean something. For instance, if you were to put the wing at a 90 degree AOA to the relative wind, then the airspeed would also read nothing or almost nothing correct? So I agree that airspeed doesn't matter, but indicated airspeed does. His point was that the stall speeds marked on the ASI (Vs and Vso) are applicable only at 1 G, maximum gross weight, and the appropriate flap/gear configuration. That's why an angle-of-attack indicator would be nice. If you're doing anything that increases the G-load on the plane, like turning or pulling up from a dive (i.e. anything that presses your behind into the seat), the stall speeds will be higher; if the plane is loaded below maximum gross weight, the stall speeds will be lower; and so on. It's a bit of an overstatement to say that stall speeds don't matter, but you do have to take them with a big grain of salt. Let's say that you have just recovered from a stall or spin and are now in a dive heading quickly towards the ground. If you pull up hard, you might stall the plane at close to double the Vs marked on the ASI. All the best, David |
#2
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"David Megginson" wrote in message
... His point was that the stall speeds marked on the ASI (Vs and Vso) are applicable only at 1 G, maximum gross weight, and the appropriate flap/gear configuration. That's why an angle-of-attack indicator would be nice. Well, in a way, the airspeed indicator IS an angle-of-attack indicator. -- Chris Hoffmann Student Pilot @ UES 30 hours |
#3
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"Chris Hoffmann" writes:
His point was that the stall speeds marked on the ASI (Vs and Vso) are applicable only at 1 G, maximum gross weight, and the appropriate flap/gear configuration. That's why an angle-of-attack indicator would be nice. Well, in a way, the airspeed indicator IS an angle-of-attack indicator. It's related to angle-of-attack, but note all the cautions in the rest of this thread. It's definitely not the same thing (that's why you see AOA indicators in some military and aerobatic aircraft). All the best, David |
#4
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On Mon, 01 Sep 2003 20:40:51 GMT, "Chris Hoffmann"
wrote: "David Megginson" wrote in message ... His point was that the stall speeds marked on the ASI (Vs and Vso) are applicable only at 1 G, maximum gross weight, and the appropriate flap/gear configuration. That's why an angle-of-attack indicator would be nice. Well, in a way, the airspeed indicator IS an angle-of-attack indicator. I've seen this The airspeed indicator is an airspeed indicator ONLY. It is not, and should not be thought of as, ANY sort of AOA indicator. If you fly long enough, this will kill you. Stall AOA, for example, is a constant. The airspeed occuring at the stall AOA can and will vary, depending on wing loading resulting primarily from the weight loaded into the aircraft or loads imposed by maneuvering the aircraft. |
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