need track replay Are the delay fuses broken for laser-guided bombs right now?

[AceMcPlane]

I was trying to bomb a tank under a bridge today and it just kept blowing up when it hit the top of the bridge like an instant fuse whether I set it to delay 1 or delay 2. Is there something I'm missing or is this just not working right now? I haven't used GBU-12's with a delayed fuse in a while, but I don't remember this ever being a problem.

[BIGNEWY]

Hi Ace

not seeing any problems related to this, best thing to do is post a short as possible track replay example so we can take a closer look. 

thank you 

[AndrewDCS2005]

Just tried this out.

Target: T-72 under railway bridge

Platform: F/A-18

Weapon: GBU-12

Fuze: FMU-152 set to function delay 0.18s

Config: EFUZ=DLY1 on stores page

 

While the GBU-12 goes through the bridge and doesn't detonate immediately on impact, in the 0.18s of delay before detonation it continues to move beyond initial point of impact and detonates around ~30ft from the target. 

So the question is how this scenario is expected to be carried out for targets below bridges (or hangars/shelters?) - shorter delay leads to premature detonation, longer delay detonates off target since the weapon seems to move under the surface quite a bit.

Track attached.

 

F18-GBU12-tank-under-bridge.trk

Edited Thursday at 11:10 AM by AndrewDCS2005

[EricJ]

I don't think the fuze is broken, but a typical Delay fuze is milliseconds, not seconds long (because the kinetic energy would produce enough to pierrce stuff, like foilage, not a bridge). So in real life you wouldn't drop a bomb on a tank under a bridge anyway. Makes no sense since the bridge would stop the bomb from blowing up a tank. Damage maybe, but the bridge would absorb much of the blast, and the sim is acting as such.

I mean you're using a 500lb bomb, use a GBU-10/24 and you might get better results too.

Edited Thursday at 11:56 AM by EricJ

[Draken35]

2 hours ago, AndrewDCS2005 said:

Just tried this out.

Target: T-72 under railway bridge

Platform: F/A-18

Weapon: GBU-12

Fuze: FMU-152 set to function delay 0.18s

Config: EFUZ=DLY1 on stores page

 

While the GBU-12 goes through the bridge and doesn't detonate immediately on impact, in the 0.18s of delay before detonation it continues to move beyond initial point of impact and detonates around ~30ft from the target. 

So the question is how this scenario is expected to be carried out for targets below bridges (or hangars/shelters?) - shorter delay leads to premature detonation, longer delay detonates off target since the weapon seems to move under the surface quite a bit.

Track attached.

 

F18-GBU12-tank-under-bridge.trk 1.66 MB · 0 downloads

I watched your track and, according to DCS the bombs were doing about 530sh Knots before impact and then I looked at it in Tacview.
That gave me 49822 ft/ min which are 830ft/sec , and not accounting for g or other accelerations, that bomb could had moved, vertically, 150ft in 0.18s...The 25ms of the FMU-152 should give around 20ft according to these numbers.

 

Edited Thursday at 12:56 PM by Draken35

[AceMcPlane]

A track won't work with the mission I'm playing. The tanks move into position randomly after you take out a nearby air defence system with SLAM-ER's so the plane will target an empty spot with no tank if you replay a track. I appreciate that AndrewDCS2005  uploaded one.

So it looks like there have been some updates to the laser guided bombs since I last used them. More realistic is good. I'm going to have to play with this more to know if it's still possible to blow them up under bridges like I did before. I think the fact that I was using the ATFLIR pod instead of the Litening didn't help. It might have been automatically switching its lock to the bridge when it lost sight of the tank as I was over top of it. The last time I had it working, I'd just target a fixed point where they're at instead of tracking them as a moving target. I'm guessing you can change the fuse time now in the UFC or maybe the stores page? That's something I have to fiddle with too. If none of this works EricJ is probably right and I should use a bigger bomb, but based on what I'm seeing I think it's not even penetrating the bridge at all because I'm doing something wrong so I'll keep testing.

[rob10]

You (mostly, there are a couple of exceptions) need to set up your fuze timings on the ground in the rearm/refuel menu (not any of the in-cockpit displays -- they're strictly for pilot reference/bomb computer use) because IRL you would have to physically change a dial on the bomb itself.

[AceMcPlane]

1 hour ago, rob10 said:

You (mostly, there are a couple of exceptions) need to set up your fuze timings on the ground in the rearm/refuel menu (not any of the in-cockpit displays -- they're strictly for pilot reference/bomb computer use) because IRL you would have to physically change a dial on the bomb itself.

Cool, good to know. Thanks for the solution.

[AceMcPlane]

Ah. I didn’t know you could click on the bombs to bring up the fuze menu. Nice. The bridge I’m punching through is around 40ft high so I’ll definitely be dropping at high altitude with a decent amount of function delay.