Hi,
I understand if we lose speed we loose lift from L = Cl.1/2.rho.V2.S
That would result in pitch down due to main wing loosing lift. What if the gust means that airspeed is constant (maybe highly theoretical...)?
The restoring force is only coming from the turning moment of the tail in that case? In that case lift from both wings (main and tail) is only modified by the relative change in AoA of both.
Maybe I'm getting out of my depth by getting too technical. I guess my question now is this:
If an upward gust causes a aeroplane to pitch up (consider speed to be constant), will the restoring effect of stability cause it to pitch back toward level, by pitching nose down slightly, even before the gust is removed? Or does the restoring pitch down only happen when the gust is removed?
My instinct leans toward the latter, which means the extra down pitch moment of the tailplane will not be present (gust removed at this stage, so the larger proportion of AoA increase on the tail, and hence larger turning moment, is removed). So the balance of forces will return to the pre-gust situation.
Is the tendency during the gust (constant speed) to start to recover to level, but this will be achieved fully once gust is removed? Maybe there is no such thing as a gust where speed remains constant??