Jdam - last bomb dropped falls behind/short of target

[Flapjacks]

I haven't seen anyone else with this issue but almost every time I pickle multiple jdams, the last one falls way short of it's target. I've experienced this with gbu 38's and 54's. It happens no matter how I designate the targets, whether it be through the tpod, HRM, or target point transfer from nav. I've tried dropping in groups of 3, 4 and 6 and it's always the last bomb of the bunch that falls short. I set direct mode, step and N/T fuze. Anyone else having this issue? 

UPDATE: It's not the last bomb released. It's bombs dropped from stations L1 and R1 on the CFTs.

Jdam.trk

Edited November 29, 2023 by Flapjacks

[Joghurt]

I tried it just now (7 GBU-34, on CFTs and centerline) and have this only with the two bombs that are transported on the back of the fuselage. They are staying behind, overflying the target and then coming back and therefore hitting way after the other bombs.

Have you checked if in your case it's always the same bomb(s) or just the last one?

I used 7 times GBU-34, on CFTs and centerline, direct, step, and tried to hit a beam of 8 hangars, programming from left to right. I set the GBUs up starting with the left center CFT to the leftmost hangar, left front CFT to second, centerline to third (and so on), right aft CFT, right center CFT, right front CFT, left aft CFT - and the fourth and seventh hangar were hit way after the rest.

Edited November 17, 2023 by Joghurt

[Agent_Scarn]

Yes, it happens to me too and it's always the last one

[Flapjacks]

4 hours ago, Joghurt said:

I tried it just now (7 GBU-34, on CFTs and centerline) and have this only with the two bombs that are transported on the back of the fuselage. They are staying behind, overflying the target and then coming back and therefore hitting way after the other bombs.

Have you checked if in your case it's always the same bomb(s) or just the last one?

I used 7 times GBU-34, on CFTs and centerline, direct, step, and tried to hit a beam of 8 hangars, programming from left to right. I set the GBUs up starting with the left center CFT to the leftmost hangar, left front CFT to second, centerline to third (and so on), right aft CFT, right center CFT, right front CFT, left aft CFT - and the fourth and seventh hangar were hit way after the rest.

 

So, I just tested without loading info to the two bombs on back, stations R1 and L1(FYI another bug, can't select the bomb on L1 until some other bombs have been dropped) and it looks to be working. Going to do some further testing, but so far, I've dropped a group of 4 and a group of 6 and they all hit their respective targets.

Further testing, after dropping the first 6 with no problem and 3 remaining bombs, it appears that something is up with both R1 and L1. Both bombs from those stations would lag behind. They still seem to hit their targets if dropped IN ZONE, albeit they kinda overfly their target a short bit then angle back towards the target. 

Edited November 17, 2023 by Flapjacks

[thodre]

I can confirm this behaviour. The last bomb after coming in way too high then even tries to hit the target by flying back in the direction it came from. Yes, and it's always the last for me too.

Edited November 17, 2023 by thodre

[zlm63682]

yes. the last bombs on the CFTs (not sure which ones.. the one that close to the engine or the cockpit??? don't remember, anyway there are always 2 bombs out of the 6 CFT bombs if using GBU38 or 54) will always maintain at high altitude and low speed, results in a fly-over the target and will TURN AROUND in the sky to the target.. sometimes hit sometimes miss, very funny indeed.

Edited November 17, 2023 by zlm63682

[Nealius]

Doing PP runs with 6xGBU38 All bombs hit their intended targets, can't see any falling noticeably short. However, when targeting from AG radar, my last bomb to impact always hits a target that's already been hit by an earlier bomb.

[Flapjacks]

1 hour ago, Nealius said:

Doing PP runs with 6xGBU38 All bombnulls hit their intended targets, can't see any falling noticeably short. However, when targeting from AG radar, my last bomb to impact always hits a target that's already been hit by an earlier bomb.

Maybe it's the same stations that's giving me problems thats causing your problem? Out of curiosity, could you try the run again without using stations L1 and R1? These two.

[Nealius]

I can try. I assume bombs that haven't been programmed get skipped in the drop sequence?

[t_hedlund]

 My understanding is the 1st bomb released is the last bomb on the CFT, so the 2 that you have boxed should be the 1st one off the jet.

[Flapjacks]

1 hour ago, Nealius said:

I can try. I assume bombs that haven't been programmed get skipped in the drop sequence?

yes

[tae.]

I can confirm after some testing that I am seeing the same issue with JDAMs loaded on L1 and R1. They always behave very oddly, losing a lot of energy and falling short of target or exhibiting strange behaviours. Every other station works just fine.

[Nealius]

This seems to only affect GBU38s. Dropping four GB31v1 in direct mode and they behave as expected. Or perhaps that was because I was lofting them instead of a level delivery. Will have to test more.

Edited November 20, 2023 by Nealius

[Flapjacks]

6 hours ago, Nealius said:

This seems to only affect GBU38s. Dropping four GB31v1 in direct mode and they behave as expected. Or perhaps that was because I was lofting them instead of a level delivery. Will have to test more.

 

I just tested with the -31v1 and have the same result as the -38 and -54 in that they all fall behind when dropped from the rear station but the -31v1 sometimes does make it to it's target when dropped in IN RANGE distances unlike the other two. Interesting find.

Edited November 20, 2023 by Flapjacks

[Flapjacks]

Thought this was fixed with this patch but it's still broken. Although sometimes the bombs from L1/R1 fly correctly, so it's not as consistently bugged

since the update. Anyone else still getting this problem?

Edited December 20, 2023 by Flapjacks

[zlm63682]

On 12/20/2023 at 8:37 AM, Flapjacks said:

Thought this was fixed with this patch but it's still broken. Although sometimes the bombs from L1/R1 fly correctly, so it's not as consistently bugged

since the update. Anyone else still getting this problem?

 

did you use GBU54? seems they have fixed 38 but not 54

[Flapjacks]

6 hours ago, zlm63682 said:

did you use GBU54? seems they have fixed 38 but not 54

Yeah, GBU-54's are what I've been using, although I also seen it happen with the GBU 38's and 31 1/B before the patch and I saw it happen with the GBU-31 penetrators yesterday. I'll try out the -38's again and see how it goes.

[Flapjacks]

@zlm63682 I tried the GBU-38's and they did good for a while but ended up having the same issue as the GBU-54's and -31's.

Edited December 22, 2023 by Flapjacks

[zlm63682]

7 hours ago, Flapjacks said:

@zlm63682 I tried the GBU-38's and they did good for a while but ended up having the same issue as the GBU-54's and -31's.

 

i have tried 6 rounds of 9 x gbu38s, dropping at max range and all hit targets after the patch

before the patch like 4 out of 6 rounds will fly overhead the target

to me it seems to be fixed

will update later if i see another overhead bomb flying

 

[Flapjacks]

1 hour ago, zlm63682 said:

i have tried 6 rounds of 9 x gbu38s, dropping at max range and all hit targets after the patch

before the patch like 4 out of 6 rounds will fly overhead the target

to me it seems to be fixed

will update later if i see another overhead bomb flying

 

Mine lose speed (when they do bug) when dropped before getting to IN ZONE distances and never reach their targets. When dropped within IN ZONE (at least the -54's, I haven't tried the -38's yet with this part), they fly overhead/past the targets then try to angle back and hit them. When that happens, sometimes they hit and sometimes they don't.

[zlm63682]

5 hours ago, Flapjacks said:

Mine lose speed (when they do bug) when dropped before getting to IN ZONE distances and never reach their targets. When dropped within IN ZONE (at least the -54's, I haven't tried the -38's yet with this part), they fly overhead/past the targets then try to angle back and hit them. When that happens, sometimes they hit and sometimes they don't.

i found the same issue to be still existed when i tested dropping the GBU38s IN ZONE and 2 of the 9 bombs still fly overhead just like before the patch

the solutions seems to be dropping the bombs as long as they are IN RANGE and they will behave properly and hit targets. in previous version no matter you drop IN RANGE or IN ZONE they just fly overhead so they only fix the problem to some degree.

[Rainmaker]

For the time being, you’ll likely have better luck giving them a manual impact angle instead of letting the bomb decide, use a default, or whatever the bomb does when you don’t tell it what to use. 

[Flapjacks]

Just wanted to update that this is still a problem. Hopefully it gets fixed with the next patch. JDAMS from stations L1 and R1 lose energy and end up falling short of their targets. Tested with every JDAM I believe and all have done it. It doesn't happen every time, but happens quite often. 

Edited January 6, 2024 by Flapjacks

[Nickkerkwijk]

On 1/6/2024 at 8:50 PM, Flapjacks said:

Just wanted to update that this is still a problem. Hopefully it gets fixed with the next patch. JDAMS from stations L1 and R1 lose energy and end up falling short of their targets. Tested with every JDAM I believe and all have done it. It doesn't happen every time, but happens quite often. 

 

Can confirm this is still a present problem. The rear 2 Jdams have a somewhat lofting trajectory and end up falling short or overcorrect last minute and miss the target. For me it doesnt matter if you drop them In Zone or In Range

[Flapjacks]

This bug wasn't fixed with today's patch. Please look into this Razbam. Stations L1 and R1 aren't releasing JDAMS properly. They lose speed and fall way short of their targets when dropped from IN RANGE distances. I've found that if I'm at roughly 35k ft and above 400 CAS that they seem to work properly or if I get within IN ZONE distances and slow to roughly 440 CAS.