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Sudden pitch down - effect from the auto trim?


Fri13

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Now and then I experience that Hornet will suddenly pitch down like it would lose something.

 

AP are off

Flaps are in AUTO

ATC can be enabled or disabled.

Mach 0.5-0.8 speed range at steady speed.

Altitudes 7000-25000 ft.

 

It commonly happens (when it does) after take-off that it is like something suddenly pulls nose to the ground.

 

But it as well can happen after 40-50 seconds of level flight with ATC maintaining speed for AUTO bombing. Just couple seconds before bomb should drop as fallline comes down and severe pitch down happens.

 

I can find reports about sudden trimmer pitching up, but nothing about pitch down notch suddenly.

 

 

i7-8700k, 32GB 2666Mhz DDR4, 2x 2080S SLI 8GB, Oculus Rift S.

i7-8700k, 16GB 2666Mhz DDR4, 1080Ti 11GB, 27" 4K, 65" HDR 4K.

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  • 2 weeks later...

Most of the cases of sudden pitch up, if right after takeoff are likely due to takeoffs with flaps in auto instead of half. Have you checked through all your control bindings to make sure you don't have pitch double bound. If using a HOTAS, it may be wise to unbind the keyboard bindings for pitch/roll etc as well. (I use the arrow keys for SRS instead)
The best thing you could do after that is try to make the bug repeatable every time with the exact same steps. Then double check that doing those steps isn't causing an input on your pitch. Turn on controls indicator. "Show Controls Indicator" RCTRL + Enter by default.

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Im having this issue when launching off a carrier, I have everything setup correctly to the T and its fighting me it really wants to dive. Just to stay level i have to apply constant stick pressure back just to keep it level. I have played with the Trim going all the way up to 23 and it still is fighting me, nothing i do will make it fly level. I also have to be almost in full afterburn to keep it from slowing down.

In the pic with the 23 on trim that was me trying to get it to fly level with any means i can here are more pics of my struggle

Digital Combat Simulator  Black Shark Screenshot 2021.01.29 - 14.49.07.38.png

Digital Combat Simulator  Black Shark Screenshot 2021.01.29 - 14.43.02.34.png

Digital Combat Simulator  Black Shark Screenshot 2021.01.28 - 21.26.49.54.png

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This started with the most recent update and now the f18 does not want to fly level. Its constantly pulling my nose down. I have adjusted the trim to try and counter this issue but I cant trim it enough . with full trim to 23 its still pulling the nose down , I also have to be almost in full afterburn to have enough force to stay level or even climb a small amount

 

Digital Combat Simulator  Black Shark Screenshot 2021.01.29 - 14.49.07.38.png

Digital Combat Simulator  Black Shark Screenshot 2021.01.28 - 21.25.00.40.png

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Gear down? 🤪

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I see that this thread is labeled as "set flaps to half" - which really goes along with my recommendation in the other thread that you have mentioned your issue in.
 

My recent comment of suggestion to you there:

Other than the flaps being incorrect in the pictures you've included - my secondary recommendation goes along the lines of what the person above has suggested (regarding input checks).

 

 

Cheers,

 

Ziptie

i7 6700 @4ghz, 32GB HyperX Fury ddr4-2133 ram, GTX980, Oculus Rift CV1, 2x1TB SSD drives (one solely for DCS OpenBeta standalone) Thrustmaster Warthog HOTAS, Thrustmaster Cougar MFDs

 

Airframes: A10C, A10CII, F/A-18C, F-14B, F-16C, UH=1H, FC3. Modules: Combined Arms, Supercarrier. Terrains: Persian Gulf, Nevada NTTR, Syria

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I'm not saying it's the cause of the problem you describe but I don't think taking off with full flaps is ever a procedure. Normal procedures are half flaps for take-off and full flaps for landing.

 

Also, FYI, I just launched from a carrier in the F-18 today and didn't experience what you describe.

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On 1/28/2021 at 8:03 AM, tech_op2000 said:

Most of the cases of sudden pitch up, if right after takeoff are likely due to takeoffs with flaps in auto instead of half. Have you checked through all your control bindings to make sure you don't have pitch double bound. If using a HOTAS, it may be wise to unbind the keyboard bindings for pitch/roll etc as well. (I use the arrow keys for SRS instead)
The best thing you could do after that is try to make the bug repeatable every time with the exact same steps. Then double check that doing those steps isn't causing an input on your pitch. Turn on controls indicator. "Show Controls Indicator" RCTRL + Enter by default.

 

This is not pitching up, but pitching Down.

Your nose will just in a second dip it nose down. As flaps would generate more lift and pitch up, this does pitch down quickly.

 

  • I don't have keyboard.
  • I don't have keyboards bindings (even Esc doesn't work).
  • This happens with flaps as Auto as manually.
  • There is no double bindings.
  • This happens in straight and level flight with steady speed or changing ones.

I can't even reproduce it with a Auto flaps by slowing down purposely to get while flaps angles changes.

 

 

i7-8700k, 32GB 2666Mhz DDR4, 2x 2080S SLI 8GB, Oculus Rift S.

i7-8700k, 16GB 2666Mhz DDR4, 1080Ti 11GB, 27" 4K, 65" HDR 4K.

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Great. Now Turn on the controls indicator and see if it is an input into the jet problem or a problem with the system.

@rooster7755 It would probably be good for you to start your own thread for this issue. and providing a track file is always helpful


Edited by tech_op2000
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9 hours ago, Rooster7755 said:

I have everything setup correctly to the T

Your first image has an amber FLAPS indication. Your Standby ASI shows about 280 so looks like FCS retracted flaps to protect the aircraft.

Your second image shows FLAPS FULL.

Your third image shows externally FLAPS FULL.

The times for all 3 shots show these are minutes apart, and you mentioned the problem just after a cat shot.

 

I think you catapulted with full flaps sir.

 

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9 hours ago, Rooster7755 said:

was it a super carrier? I dunno im just trying to figure this out.  I tried it with flaps in every position and it does it in all cases.  THat one pic was just the one when i was in that setting

Yes, I launched from the super carrier.

 

How is the jet being started? Hot Start, Manual Start from a cold jet, or Auto Start? If you are Manually Starting you may be missing some item(s) in the checklist.

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17 hours ago, Ziptie said:

I see that this thread is labeled as "set flaps to half" - which really goes along with my recommendation in the other thread that you have mentioned your issue in.
 

My recent comment of suggestion to you there:

Other than the flaps being incorrect in the pictures you've included - my secondary recommendation goes along the lines of what the person above has suggested (regarding input checks).

 

 

Cheers,

 

Ziptie

So I tried another campaign that isnt Raven one and It doesnt happen. even with the flaps set to whatever. Sure  you fall a bit but you can easily power out of it with full afterburn. Im telling you there is something going on here other than flaps not being set correctly.  I can take off no problem out side of this mission

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No, I do not have Raven One.

 

Unfortunately, if you do an auto start, launch with half flaps, and bring up the gear and flaps right after launch, I can’t imagine what’s causing the pitch down for you.

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5 hours ago, FoxTwo said:

Are you resetting the FCS and take-off trim? Are you set to +15-17 trim for carrier takeoff by weight?

Yes yes and yes, I cant seem to post a file here its too big, but Im pretty sure its not pilot error. I have taken off from a carrier so many times and even if my trim or flaps were not set correctly you can usually power out of it, This is a constant pull nose down, I tried it on starting in the air and its not an issue. I also tried off the old carrier and it doesnt do it. It seems to be tied to the super carrier or the raven one mission.  Or something because that is the only place it happens. and it only started for me after an update the other day.

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2 hours ago, FoxTwo said:

I just tried taking off in mission 9 of raven one without issue.


What mission specifically are you noticing the issue with?

its only 8 the one where you have the fast movers, Ive been taking off all day today in other missions and stuff with ZERO issues, heck i even missed the wire and have to full afterburn off the deck and still made it.  Ive tried it on autostart and manual start doing all the flcs stuff trim and flaps at half all that stuff and still the nnose just wants to pull down like there is a weight on the nose. I didnt mess with the loadout and its not overweight

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