the aircraft stalled approximately 50kts above Vs1.0g speed. The resulting rotation rate was sufficient to throw an outboard engine off the pylon.
Splash,
grief,
flowers,
eulogies etc.
This was an extreme case, as it occurred in a VMCA demonstration with rudder boost off, but the physics remains, high beta angles, and spoiler rise results in an elevated stall speedparticularly on a swept wing. If trying to maintain a total lift evel such as in level flight, or a constant flight path, then the aoa is increased. Recently listened to a qualified & experienced group of crew discussing the IAS bands on a B744 with speedbrake raised, comment was that the increased indication is "just a glitch in the display...". Really?
Being out of balance wil increase the stall speed where spoilers are used for roll control. Using speedbrake will for a 1.0g condition increase stall speed. The amounts are dependent on the aircraft design.
Last edited by fdr; 13th Aug 2009 at 03:12.