F-15QA at Qatar Air Show

[Lonewolf_50]

https://youtu.be/Ar6f4Pw3UHs

As I read the article that this came from, on the Drive, I was interested to learn that the Eagle (In this iteration) is fly by wire.
Nice airshow bit.

[Commando Cody]

https://youtu.be/Ar6f4Pw3UHs

As I read the article that this came from, on the Drive, I was interested to learn that the Eagle (In this iteration) is fly by wire.
Nice airshow bit.

It was the introduction of FBW on the QA and SA (and consequently the EX) that permitted activation of the Eagle's outboard wing stations.

[Ascend Charlie]

The fluttering of the elevators at 1:27 is interesting.

[Avionker]

The fluttering of the elevators at 1:27 is interesting.

Pretty sure that is intentional flight control modulation as opposed to flutter.

[Less Hair]

By returning to "straight" it might clean the stabilizer from turbulent air to get back the maximum effect it can get flying that slow?

[Thrust Augmentation]

Pretty impressive for a strike aircraft approaching the weight of a WW2 heavy bomber & without thrust vectoring.

[dead_pan]

Looks a bit Foxbatty from the underside

[Ascend Charlie]

Pretty sure that is intentional flight control modulation as opposed to flutter.

Perhaps "flutter" was the incorrect term - the movements of the elevators are quite dramatic to get the attitudes desired by the computers.

[57mm]

Food for thought in that video. If performance of that standard can be wrung from an airframe approaching 50 years old, there must be hope for other fighters of this vintage.

[Easy Street]

Food for thought in that video. If performance of that standard can be wrung from an airframe approaching 50 years old, there must be hope for other fighters of this vintage.

Hmm, not sure about that. McDonnell got the fundamentals right with F15 - the original 'flying tennis court' with low wing loading, twin tails and significant excess power all foreshadowing the design approach taken by Sukhoi with the Flanker. It would take more than a modern flight control system to wring that kind of performance out of a Tornado or a Mirage!!

[Big Pistons Forever]

Any modern fighter is going to be pretty sporty with no weapons and only enough fuel to do a 5 minute show. How zippy is it with a full weapons loadout and enough fuel to get to enemy territory ?

[Thrust Augmentation]

Any modern fighter is going to be pretty sporty with no weapons and only enough fuel to do a 5 minute show. How zippy is it with a full weapons loadout and enough fuel to get to enemy territory ?

True, but the only place most will ever see an aircraft performing like this is at an airshow & everything performing there is light load, short duration, so some comparison can be made.

[chopper2004]

https://youtu.be/Ar6f4Pw3UHs

As I read the article that this came from, on the Drive, I was interested to learn that the Eagle (In this iteration) is fly by wire.
Nice airshow bit.

Over the last couple of years, its been great to see F-15QA transiting through RAF Mildenhall from St Louis, on their way to Doha and I have been attending Dubai Air Show all this week so its great to see the F-15QA Abibail fly so here are my photos below.

https://cimg7.ibsrv.net/gimg/pprune.org-vbulletin/2000x1333/f15qa_dubai_2023_285756d83310c206239d814cc7665116dabf80f9.jp g
https://cimg4.ibsrv.net/gimg/pprune.org-vbulletin/960x640/f15qa_1_dubai_2023_17cebc45c20d9d53395469874d70129e95b625de. jpg
https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/960x640/f15qa_3_dubai_2023_84b14aec201ad51633c276c86b26ae39dfb59661. jpg
https://cimg6.ibsrv.net/gimg/pprune.org-vbulletin/960x640/f15qa_4_dubai_2023_eca7dad659a33a38d65d377e5f8cc1f362b8b801. jpg

Pretty impressive, then again, ones used to going down to RAF Lakenheath on friday morning to see the Panthers and Bolars do unrestricted climbs along with their F-35A cohorts of the Grim Reapers and Valkyries

cheers

[Octane]

Anyone know why at times the exhaust is smokey?

[henra]

Perhaps "flutter" was the incorrect term - the movements of the elevators are quite dramatic to get the attitudes desired by the computers.
High gain in the feedback loop. Seems they are trying to keep the values quite close to the target values. The elevator is still deflected quite a bit upward. Seems they didn't go too deep into relaxed stability territory. That said, It's always a bit of a trade- off between High Alpha and Lift/Drag optimisation in high speed turns. Seems they went more the F-18 path than the F-16 route.
Still quite an impressive show by this good old and big bird.

[unmanned_droid]

Just not ideal combustion regime so you get more soot by product

In this configuration the QA must be approaching a T/W = 1, and it shows in the vertical 8 imo.

The amount of movement on the HStabs is interesting - its usually lower amplitude higher frequency on truly unstable aircraft, so I tend to agree that this might be more to do with re-attaching flow and keeping control surface power up.

I think the Singaporeans have internal AMRAAM bays in their CFTs (permanently attached?).

[Commando Cody]

Just not ideal combustion regime so you get more soot by product

In this configuration the QA must be approaching a T/W = 1, and it shows in the vertical 8 imo.

The amount of movement on the HStabs is interesting - its usually lower amplitude higher frequency on truly unstable aircraft, so I tend to agree that this might be more to do with re-attaching flow and keeping control surface power up.

I think the Singaporeans have internal AMRAAM bays in their CFTs (permanently attached?).

I don't think Singapore does since they would have had to pay the whole development cost themselves to add that unique capability to their SGs.

[unmanned_droid]

I don't think Singapore does since they would have had to pay the whole development cost themselves to add that unique capability to their SGs.

You're right, it was the F-15SE (from 2009!) that had two internal carriage bays per CFT for AMRAAMs.

https://secure.boeingimages.com/archive/F-15SE-Silent-Eagle-Displays-Internally-Mounted-AIM-120-AMRAAM-Missiles-2F3XC5HU08Z.html