Subject: Stall proof
From: Paul
Date: 1/14/2001, 1:38 PM


"Tami, John E" wrote:
 >
 > That's how it's taught to F-16 Pilots. If you get into a deep stall (not
 > easy to do with Computerized Flight System) you must disable the CFS (
there
 > is a switch) and then manually get in synch with pitch oscillations. You
 > should be able to do it within 3-4 cycles....if not...punch out time!
And
at
 > the speed they are falling...you best be paying attention to your
altitude!


This stuff is really neat to hear about.  The stories about the velocity
stalls are really amazing.  I'm surprised I have never heard about that
before.

Not that it contributes to the discussion but I was able to attend a lecture
for F-18 pilots on uncontrolled flight.  The F-18 has some 7 different stable
(will continue until countered) uncontrolled flight (falling) patterns (about
5 upright and 2 inverted).  All have been successfully recovered from in
flight,  but sometimes 20k' is not enough time.  Some are very violent,
producing in excess of 7 lateral G's in alternating directions.  As expected,
most are highly dependent on external configuration for entry characteristics
(weapons, external tanks, canopy size), as well as weight distribution (try
doing a dynamic W&B for 7 different fuel tanks and weapons... thank God for
computers) and transonic characteristics.  Surprisingly (to me), a couple of
these "spin" modes can occur in what I would think were very stable portions
of the flight envelope such as moderate speed and unloaded flight.

Just for fun.

Dave Leonard

 
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