GPS-guided bombs getting it wrong

[MATTAY]

I'm having a problem with the GPS-guided bombs LS-250/500 and sb-6 of the JF-17, I mark the PP1 waypoint on the target I want and release my bombs, they fly to the target and when they arrive at the target they They miss and fall 200 meters away, this happened with the glide bombs from my friend's F-18 too, he set the coordinates and the bombs fell very far from the target.

Before this didn't happen, the bombs went exactly where I placed the waypoint with a precision of about 3 to 5 meters, now it's impossible to use them

Edited January 7, 2024 by MATTAY

[rob10]

Post a track and people will be able to see what you're doing and maybe help.  You can save a track from the debrief screen after you finish the mission.

[MATTAY]

22 hours ago, rob10 said:

Post a track and people will be able to see what you're doing and maybe help.  You can save a track from the debrief screen after you finish the mission.

Can I record a video and post it here? it would be easier for me.

[Gierasimov]

11 minutes ago, MATTAY said:

Can I record a video and post it here? it would be easier for me.

No, the videos are not good enough to check the problem. Track must show the issue you are having and as short as possible. 

I don't know much about JF-17 but Hornet JDAMS used to have issue when terrain elevation was high. Also, make sure your target waypoint is set initially to 0 feet and allow it adjust automatically based on the coordinates for a given map. Alignment of JDAMS is important alike. 

[rob10]

3 hours ago, MATTAY said:

Can I record a video and post it here? it would be easier for me.

Posting a track is likely much easier than making a video.  Fly a short flight showing the issue.  Exit mission.  Click "save track" file on the debrief screen.  Upload.

If making a video and posting it is easier I'd be genuinely curious why (maybe there is something I'm missing).

And as Gierasimov said, a track show exactly what buttons you pressed or moved (or maybe switches that defaulted to on because your HOTAS synced them that way) that may not be obvious in a video.  That's why a track is always asked for.  You might think you're showing how to reproduce an issue, but sometimes there is a small thing you don't mention or show that makes a difference.

[My_Name_Jeff]

9 hours ago, rob10 said:

Posting a track is likely much easier than making a video.  Fly a short flight showing the issue.  Exit mission.  Click "save track" file on the debrief screen.  Upload.

If making a video and posting it is easier I'd be genuinely curious why (maybe there is something I'm missing).

And as Gierasimov said, a track show exactly what buttons you pressed or moved (or maybe switches that defaulted to on because your HOTAS synced them that way) that may not be obvious in a video.  That's why a track is always asked for.  You might think you're showing how to reproduce an issue, but sometimes there is a small thing you don't mention or show that makes a difference.

Check weapon alignment, by default when you enter anti ground mode, it should be on the sub display of right mfd, you'll see a count down, make sure the count down is over before launch

[SOLIDKREATE]

On 1/7/2024 at 11:24 AM, MATTAY said:

I'm having a problem with the GPS-guided bombs LS-250/500 and sb-6 of the JF-17, I mark the PP1 waypoint on the target I want and release my bombs, they fly to the target and when they arrive at the target they They miss and fall 200 meters away, this happened with the glide bombs from my friend's F-18 too, he set the coordinates and the bombs fell very far from the target.

Before this didn't happen, the bombs went exactly where I placed the waypoint with a precision of about 3 to 5 meters, now it's impossible to use them

 

 

Has he tried to target them with the T-POD? I just waypoints to get close and then I just lock them up with the pod.

[MATTAY]

On 1/7/2024 at 5:19 PM, rob10 said:

Post a track and people will be able to see what you're doing and maybe help.  You can save a track from the debrief screen after you finish the mission.

I'm sorry for the delay in posting. I did the test with the LS-250 GB-6 HE/SFW bombs, 2 LS-250 bombs I launched in TOO mode (follows the target you locked on the camera) and all the others I launched in PP mode (follows the target marked on the Waypoint ), the only bomb that caused a problem was the SFW bomb, which is fragmentation. This didn't happen in the past, I took the measurement and the SFW bomb fell 500 meters from the marked target.

bomb test.trk

On 1/9/2024 at 5:50 AM, SOLIDKREATE said:

 

Has he tried to target them with the T-POD? I just waypoints to get close and then I just lock them up with the pod.

he marked it using the GPS using the coordinates on the map.

[SOLIDKREATE]

17 hours ago, MATTAY said:

bomb test.trk 1.41 MB · 1 download

he marked it using the GPS using the coordinates on the map.

 

I know, I was asking if maybe he could try that and hit his targets. I think it would work better.

[MATTAY]

On 1/12/2024 at 5:00 AM, SOLIDKREATE said:

 

I know, I was asking if maybe he could try that and hit his targets. I think it would work better.

I'm waiting for a solution, the problem still occurs today

bomb test.trk

[Nix Mills]

I too have found that GBU-32s consistently fall about 100 to 200 ft short of the target point when released at near-maximum range. In my case from the Hornet. At closer ranges, it hits just fine. 

Images here show a GBU-32 pickled a few seconds after getting 'in zone'. Speed 350 kts at 12,300 ft in PP mode with precise target coordinates (lat/long) and elevation (ft). Target was the pump jack, bomb falls short and hits the building and fence.

Hope this helps. Love your work.

 

[Tango3B]

On 1/30/2024 at 9:46 AM, Nix Mills said:

I too have found that GBU-32s consistently fall about 100 to 200 ft short of the target point when released at near-maximum range. In my case from the Hornet. At closer ranges, it hits just fine. 

Images here show a GBU-32 pickled a few seconds after getting 'in zone'. Speed 350 kts at 12,300 ft in PP mode with precise target coordinates (lat/long) and elevation (ft). Target was the pump jack, bomb falls short and hits the building and fence.

Hope this helps. Love your work.

 

Also, you always want to use the laser ranging for a few seconds before you pickle your GBU. Why is that? Because this way you basically update the slant range determined by the TGP to the most accurate actual slant range which otherwise might be some feet off without laser ranging. Is this even simulated in DCS you might ask? Yes. Best example is the F-16C. So, always do a little laser ranging and then you should be good to go.
Note: This is not required when using radar generated range/coordinates. Radar generated range/coordinates are accurate enough. 
 

*to the OP: the GPS guided bombs used by the JF-17 currently have guidance issues. This is a known bug.

Edited January 31, 2024 by Tango3B

[Napillo]

On 1/30/2024 at 1:46 AM, Nix Mills said:

bomb falls short and hits the building and fence

The bomb calculations aren't going to take into consideration the obstacles in the way, you have to do that part. If the building and fence weren't there, would the bomb have reached it's target? I'm going to say probably so, max range is going to have the shallowest dive, or the longest glide. Come in at an angle where there's no obstacles near the target, or wait until it has a steeper dive.