How to induce Deep Stall
-
I’m gonna try this again. I was using a -D model before with just a center line tank and asymmetric missiles. I noticed the video has a -C model with a TGP as well.
-
As I said, that’s the only function of MPO: disconnect the neg G limiter.
-
Saw this and thought it was cool. No info on how the jet was loaded, but gives a HUD view of departure in left turn at M0.91 and 36~37k:
-
Nice find. I still have not seen a r/l vid with a comfirmed deep stall. They must as rare in r/l as they are in F4.
-
Found one…… nasty
-
Does not sound like this guy was able to rock out of it with the MPO and has to use the drogue chute.
Some countries deep stall SOP is a chute recovery?
-
Saw this and thought it was cool. No info on how the jet was loaded, but gives a HUD view of departure in left turn at M0.91 and 36~37k:
I think that’s the HUD cam from the video posted in post #22. You can just hear what sounds like the same female voice in the background of the AvWeb external video. And it’s the same kind of test - Yaw Departure during Test Flight.
-
Does not sound like this guy was able to rock out of it with the MPO and has to use the drogue chute.
Some countries deep stall SOP is a chute recovery?
Chute did not deploy.
Check YouTube Description, then listen again …. you’ll hear it.
-
I heard that…
then I think he said “chute ____ late.” -
I think that’s the HUD cam from the video posted in post #22. You can just hear what sounds like the same female voice in the background of the AvWeb external video. And it’s the same kind of test - Yaw Departure during Test Flight.
It was probably similar, but the on in #22 was a right-turn. This one was a left.
I tried to replicate and was still unsuccessful. Block 52 with center tank, TGP, two AIM120s on left wing, one (STA9) on the right. Tried M0.8 and M0.9 at 37k. No departure. I even added the “boot-full of right rudder” myself and all I got was the stall horn for a brief second. I don’t understand what I’m doing wrong.
-
I’ve tried a lot of load out. Even empty the forward tank to move the CG aft. No departure.
There is a TE that was bundled with BMS that I did get a good departure, but, never could repeat it.
It was a test flight TE. iirc ,“FLCS failure” maybe -
I heard that…
then I think he said “chute ____ late.”@YouTube:
“Deploy” = Deploy the Spin Recovery Parachute
“Deploy, Deploy, Deploy”“How’s the Chute?”, “No Chute”, “Negative Chute” = The Spin Recovery Parchute Failed to Deploy (electrical connector had come undone)
Then “Chute Arm Light is Off”
-
It was probably similar, but the on in #22 was a right-turn. This one was a left.
I tried to replicate and was still unsuccessful. Block 52 with center tank, TGP, two AIM120s on left wing, one (STA9) on the right. Tried M0.8 and M0.9 at 37k. No departure. I even added the “boot-full of right rudder” myself and all I got was the stall horn for a brief second. I don’t understand what I’m doing wrong.
I tried this maneuver many times but the result was same: No Departure. I think it doesn’t work in BMS.
-
This thread cracks me up
5 pages on how to get your aircraft into a bad situation :uham:
All jokes aside keep your aircraft flying and not falling.
-
HARTs does not induce a departure. They are horn awareness and recovery techniques which if flown correctly never depart controlled flight. The airplane will commonly self-recover with no pilot input from most departures. A deep stall is a pitch departure which has reached and is maintaining a stable AOA at ±60°. What the FLCS does in pitch departures is command the tail surfaces either maximum up or down which is often enough for self-recovery. The deep stall is a situation where the airplane is in positive stability region around ±60° AOA and also doesn’t have the tail surface authority to leave it by applying constant deflection. The tail surfaces do have authority to recover from this stable AOA if intelligently rocked to generate sufficient pitch rate to leave the undesired stability region.
To get into a deep stall we must not only cause the AOA to approach ±60° but somehow reduce the pitch rate such that the automatic FLCS reaction of maximum deflection of the tail surfaces is insufficient to transit the airplane through this region and achieve self-recovery. Simply being at this AOA instantaneously is not sufficient as pitch rate or tail surface authority can be enough for the simplistic FLCS recovery to be enough. If the airplane achieves self-recovery then it was merely a departure and not a deep stall.
Accidentally getting into a deep stall is not assured however the MPO allows the pilot enough tail surface authority to encourage the airplane into this state such that the FLCS input to the tail surfaces alone cannot achieve self-recovery.
Stabilize in the TE at altitude and about 200-250KT level flight. Set the pitch about 60 degrees nose high and reduce the throttle to idle. Switch the view to external and take note of the AOA readout on the bar at the bottom. Press and hold the master pitch override to retain tail surface control throughout the departure. Speed will decrease and AOA will increase due to the pitch and power combination. As the nose begins to naturally fall, apply pitch input to maintain attitude. Beyond 30 degrees AOA the airplane will depart. Use forward and aft pitch input to dampen the AOA as near as possible at 60 degrees. As AOA exceeds 60 pitch foward, below 60 pitch aft. Once the AOA is stabilized at 60 degrees, release MPO and the controls. Notice that the FLCS will command tail surfaces for pitch downward and that the airplane will not undergo self-recovery. The airplane is stable at this AOA and despite some control possible by the tail surfaces it is insufficient to resume normal flight as the FLCS applies it.
To recover, engage MPO and apply full aft input. At the maximum pitch attitude, reverse the stick input to full forward. If the airplane reduces AOA enough to recover, maintain a nose low attitude until 200KT before recovering from the dive. If the minimum pitch attitude is insufficient, reverse the controls again as the downward pitch rate ceases and repeat the process.
-