Broken INS due to "jumping" on CV

[The_Tau]

Hey,

I have this issue, not sure if its bug or not. But check this mission I recorded 

 

at 13:30 You can see how me (I am number 3 in flight) and my buddy (number 2 in our flight) jumps like crazy, as (possibly) ship was turning towards wind.

It seem that it broke our INS as our 3rd Tomcat (our lead) seem to be fine and he didn't register jumping on his part.

at 43:50 lead takes us to bombing zone but as you can see his directions are much different then mine. That's when I noticed something is wrong. I compare my A/C coordinates with GPS and I found them wrong. I do some not perfect realignment (I just copy A/C coords from GPS), but it doesnt fix it. My buddy (nr 2) notices as well that his flight plan is different then our lead 

at 45:00 I check my wind according to INS and it shows 175 for 65kt, quite a lot. I ask my Lead for his wind and he says its 292 for 10 kt. A big difference. My theory is that "jumping" damaged somehow wind sensor or system that calculates it and "fake" wind is "pushing us" off course according to INS. Wind strength is only rising with time making system more and more wrong. Its not the first time this happen to me. Other time at the end of mission according to INS wind was like 1000kts and higher and I was like 10000nm away from waypoints. Interestingly my nr2 had also wrong wind but much less then me. 

at 52:05 I decided to switch to IMU mode (a bit sloppy in updating wind taken from lead, but I think it was correct way) and update my position again coping from GPS. It seem it fixed the problem. But also its weird that I entered wind 295 for 10 kt but the HSD in DEST mode shows wind 180 for 10kt. What gives? you can see it at 56:10

Also at 56:10 I ask them to report winds again. Lead have 229 for 13kt and nr 2 178 for 49kt (so its increasing as well)

at 1:09:45 I update wind on deck 240 for 17kt. However at 1:14:55 HSD  DEST compass still shows 180 for 17kt for some reason. 

at 1:15:50 you can see the accuracy of manual wind, not bad, but not too accurate 

So question is. Is there anything I should done differently is this scenario? Anything to do to prevent this scenario? I realize that F14 jumping on supercarrier is more ED thing (F18s also can jump but they got fancy INS/GPS so they dont feel it at all). But this is not the first time this happens, and I only recently I learned to use IMU to salvage NAV system as over time 1000kt wind makes radar completely useless making BVR impossible leaving you with only PAL and VSL. It can be a mission killer and we can fly long missions.

Any inputs are welcome 

 

Edited October 22, 2022 by The_Tau

[Lt_Jaeger]

Nobody ever experienced this?

I was - 2 on this mission and the only out of the ordinary was the heavy "bumping" during startup. 

Wonder what gets broken in this situation and what can be done to rectify it. 

Edited October 23, 2022 by Lt_Jaeger

[Q3ark]

I’ve seen bumping around like that when the carrier starts turning, not sure if that’s the problem. 

[Nealius]

I've experienced the bumping a few times, and it may have messed with my INS as well. A short time ago I posted about breaking my HUD/VDI/HSI no more than 4Gs pulled in the entire mission, and I recally on that mission my plane was bumping around a bit before I launched. I didn't think anything of a possible connection but now it's making me question that again.

[The_Tau]

I think 2.8 patch fixed "jumping" on turning carrier, therefore I suspect that issue  of breaking INS due to that is gone but need more testing

Edited November 2, 2022 by The_Tau