PPRuNe Forums - View Single Post - explain the "auto throttle" to me/us
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Old 14th Dec 2013, 18:54
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roulishollandais
 
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Originally Posted by Capt Bloggs
Gums, you've lost me. For any configuration, there is only one speed that will give you a particular AoA. That is why Vref to the knot is used by airliners. Somebody decided many moons ago that speed would be a better "target" to use.

Airliners generally don't do accelerated stalls so the stalling speed is always the same for a particular configuration and in any case is calculated by theFMS (taking into account allsortsof thingslikeC of G)and is displayed on the ASI by way of Vref, being the stall plus 30%.
NO NO NO! That is only true in steady flight. Stall is a transient situation.
See the PRANDTL basic curve : all the points are mesured at the same speed, but different AoA.
Speed is a bad indicator of stall. Only AoA is true
gums is true.

Last edited by roulishollandais; 14th Dec 2013 at 19:21.
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