Problems with GBU38s

[Tj1376]

Hey team!

 

A buddy of mine swears he can employ 3 gbu 38s on a target no issues. Im trying to get one on target and can nearly never get a hit. I saved a track of how I do this, could any of you fine folks help me figure out what Im doing wrong in the employment of this weapon on the Harrier? I have much better success on the F18!!! :(

 

Master Arm ON

J82 selected

Fuze to inst

tpod laser armed on lrng and fired at target

hold down waypoint next button for longer than .8 second

verify inrange counter starts counting up to 100

release

 

I release two bombs on this pass at two targets, one with north of 80% hit probability and one with 40% hit probability. Both bombs miss their target.

harriergbu38miss.trk

 

Is this expected? Am I doing something wrong?

 

HELP!

 

TJ

[harvesthunt]

Without even watching the track, you need to release AS CLOSE to 100 as possible. The counter will start out at 0 then work it's way to 100% probability, then it will count down as the probability decreases. AS CLOSE AS POSSIBLE to 100 is the ticket. Give that a shot and see how that works!

 

Just think about your example. In addition to your probability of hits, you have a 20% and 60% chance of miss, respectively.

 

Good Luck

[ChickenSim]

The 100 isn't probability of hit. It's physically how far into the release window you are.

[Tj1376]

So you guys can put GBU 38s on target using TOO mode? I guess thats the real question, and if so, how do you do it? I have to be doing something wrong, I just cant figure out what it is.

 

TJ

[Biga42]

in this video, 2 Harriers 20 GBU dropped on target. Its spoken in portuguese but you will get he point

 

[Frederf]

I can. It's good to look at the MSN page so you can see what coordinates are stored on the weapon before release. That is the authoritative source of information.

 

Anything which shoves target position in those fields on the MSN page is a method of TOO JDAM attacking. That can be a waypoint which has been designated as TGT, radar designated as target, or FLIR designated as target, and probably a few ways I don't know about.

 

I think the easiest way is to get the FLIR pod in inertial mode (has a diamond in the center of the display). If you can manage to get it pointed at a target you should see the JDAM MSN coordinates change in real time as you slew around the FLIR diamond. If it doesn't press TDC designate and try again. With FLIR suppling "live" target coordinates I was able to drop 6 JDAMs on six parked trucks inside 10-20 seconds from first to last.

[Tj1376]

I can. It's good to look at the MSN page so you can see what coordinates are stored on the weapon before release. That is the authoritative source of information.

 

Anything which shoves target position in those fields on the MSN page is a method of TOO JDAM attacking. That can be a waypoint which has been designated as TGT, radar designated as target, or FLIR designated as target, and probably a few ways I don't know about.

 

I think the easiest way is to get the FLIR pod in inertial mode (has a diamond in the center of the display). If you can manage to get it pointed at a target you should see the JDAM MSN coordinates change in real time as you slew around the FLIR diamond. If it doesn't press TDC designate and try again. With FLIR suppling "live" target coordinates I was able to drop 6 JDAMs on six parked trucks inside 10-20 seconds from first to last.

Can you upload a track so I can see what you are doing? Also, what do you mean "MSN" page?

 

TJ

 

Sent from my SM-N970U using Tapatalk

Edited August 14, 2020 by Tj1376

[LastRifleRound]

I can. It's good to look at the MSN page so you can see what coordinates are stored on the weapon before release. That is the authoritative source of information.

 

Anything which shoves target position in those fields on the MSN page is a method of TOO JDAM attacking. That can be a waypoint which has been designated as TGT, radar designated as target, or FLIR designated as target, and probably a few ways I don't know about.

 

I think the easiest way is to get the FLIR pod in inertial mode (has a diamond in the center of the display). If you can manage to get it pointed at a target you should see the JDAM MSN coordinates change in real time as you slew around the FLIR diamond. If it doesn't press TDC designate and try again. With FLIR suppling "live" target coordinates I was able to drop 6 JDAMs on six parked trucks inside 10-20 seconds from first to last.

 

This is for the Hornet

[Frederf]

Sorry, confused. I was thinking F/A-18 not AV-8B.

[Mars Exulte]

Are you sure you're supposed to use lrng? I'm 99% certain you use the regular target mode as if lasering for a maverick etc. Using the JDAM in TOO effectively turns it into a LGB for practical purposes.

 

I haven't done in it in quite a while, though

[F1GHTS-ON]

another test you could run is to set up the target as pre planned (i.e target data inputted from F10 map and loaded as "T1" either before (easier) or after take off). Now fly to target and use TPOD to set up TOO JDAM target.

 

In the CAS page data is there a way now of comparing the position/ data - they should be the same.

 

Noting the comment above about dropping at/as near to 100% as poss. I've always dropped in the 90's (%) but today in MP, I dropped 10 GBU-38's (pre planned) in the 40% range because of need to take avoiding action. 9 out of 10 direct hits and a good 30% damaged against an MBT for the 10th ....so I'm not entirely sold on holding out for that perfect 100% drop point.... just a thought :)

[Tj1376]

Are you sure you're supposed to use lrng? I'm 99% certain you use the regular target mode as if lasering for a maverick etc. Using the JDAM in TOO effectively turns it into a LGB for practical purposes.

 

I haven't done in it in quite a while, though

 

In the hopes that you were right, I tried on the latest open beta- makes no difference. Using the normal laser tracking (liked you use for a maverick) to create a target waypoint for the jdam in TOO mode did not increase its accuracy. Thx for the suggestion though!

 

TJ

[Tj1376]

another test you could run is to set up the target as pre planned (i.e target data inputted from F10 map and loaded as "T1" either before (easier) or after take off). Now fly to target and use TPOD to set up TOO JDAM target.

 

In the CAS page data is there a way now of comparing the position/ data - they should be the same.

 

Noting the comment above about dropping at/as near to 100% as poss. I've always dropped in the 90's (%) but today in MP, I dropped 10 GBU-38's (pre planned) in the 40% range because of need to take avoiding action. 9 out of 10 direct hits and a good 30% damaged against an MBT for the 10th ....so I'm not entirely sold on holding out for that perfect 100% drop point.... just a thought :)

 

Even zoomed in ALL THE WAY on the F10 map and placing the circle over the enemy unit and then employing PP mode isnt yielding accurate results with the 38. Although this mode is useless on our server as we disable units visible in the F10 map, so I wont have this option.

 

I agree with your comments on percentage - believe its just percentage in zone, not accuracy. Ironically I get more hits around the 30-40% range than I do at 90% and above.

 

Thx though

 

TJ