need evidence GBU-24 CLAR PP. LAR not displayed until in-line with planned attack vector.

[Hippo]

Sorry if this is not a bug, but if it isn't then I'm struggling to see the point of using CLAR PP over CLAR SL.  The manual on p. 332 states

Quote

The straight-line LAR is only displayed when target steering error is less than 20°.

This suggests to me that in PP CLAR the LAR should appear with larger steering errors.  In the attached track I am planning to attack the target at WP1 on a heading of 270, by flying to a point near to WP2 and starting the attack from there.  Shouldn't I see the LAR on the HSI well before I am lined up?  Otherwise, what is the point?

At 6:03 (first screenshot) I have designated the target.  Shouldn't I be seeing the LAR at this point?  BTW the arrow showing the offset ?steering error? 67 is not explained in the manual.

Only at around 6:05 (second screenshot) does the LAR appear.

Hopefully I'm explaining myself adequately, and apologies again if it's me misunderstanding.

gbu-24_clar_pp.trk

Edited March 23, 2023 by Hippo

[BIGNEWY]

Hi, 

based on the information we have it is implemented correctly. but if you have public information that would suggest different please PM me. 

thank you

[Hippo]

Thanks for responding.  I don't have any such information.  I probably should have posted in the main forum and not in bugs; it's just that this mode doesn't seem to offer very much to distinguish it from SL  Maybe I'm misunderstanding something, but why use PP when you can just fly the bearing you want to the target and then use SL; all it seems to offer is to save the pilot from doing a subtraction (of bearings) in their head.  It seems rather implausible that such a mode would be implemented when it offers so little additonal value to SL.

Edited March 23, 2023 by Hippo

[Hippo]

Sorry to keep banging on about this, and you might want to move this post out of bugs and into the general forum, but the workings of this mode just appear irrational to me.  Perhaps I'm missing something and someone can explain the thinking behind it.  I have attached a second track.  If you go to 06:06, I have designated the target near WP1.  You will probably want to watch it speeded up.  Why the following work as they do is inexplicable to me:

The LAR appears on the HSI depending only on your heading and not on your position relative to the target.

So the only point of this mode seems to be that the LAR is not shown if your aircraft's heading does not match (+ or - some angle) the selected heading irrespective of the aircraft's postiion.  I can see no realistic practical advantage to using it instead of SL.

gbu-24_clar_pp_01.trk

Edited March 24, 2023 by Hippo

[maxTRX]

11 hours ago, Hippo said:

Sorry to keep banging on about this, and you might want to move this post out of bugs and into the general forum, but the workings of this mode just appear irrational to me.  Perhaps I'm missing something and someone can explain the thinking behind it.  I have attached a second track.  If you go to 06:06, I have designated the target near WP1.  You will probably want to watch it speeded up.  Why the following work as they do is inexplicable to me:

The LAR appears on the HSI depending only on your heading and not on your position relative to the target.

So the only point of this mode seems to be that the LAR is not shown if your aircraft's heading does not match (+ or - some angle) the selected heading irrespective of the aircraft's postiion.  I can see no realistic practical advantage to using it instead of SL.

gbu-24_clar_pp_01.trk 237.31 kB · 2 downloads

 

I agree. I couldn't see any advantage of using PP LAR over any other mode... the way they are modelled, especially when launching from low altitudes.  On top that there is another LAR calculation bug related to high elevation targets. Say you target is at 10k ft. and your release alt. is 15 or 16k. The only way for the bomb to reach the target is by using MAN mode and releasing at min LAR. It's been reported a while back.