Laser weapons miss moving units bug

[Skarp]

have an Abrams driving full speed on a road and try to drop a gbu12 or laser rocket. the weapons will hit just behind them and miss.

laserbugjf17.trk

Edited July 23, 2020 by Skarp

[Skarp]

updated OP with track showing an example.

[Fri13]

Should do so.... GBU-12 ain't capable track moving targets. That is the AGM-65 Mavericks purpose.

 

The GBU-12 can hit moving targets, if they move slow, like a 10-15 km/h. A walking man speed is about 4 km/h and jogging a 6 km/h. So it is about cyclist speed it can hit at around 10-15 km/h.

 

The new GBU-49 is designed for that. It has dual-seeker, Laser and GPS guidance, and it has proportional navigation for moving targets so it will measure distance to target and calculate intercept point to it.

 

The GBU-49 guidance is as well proportional, it's wings can be deflected proportionally so it can fly more effectively against high wind or make better corrections.

 

The GBU-12 has so called "bang-bang" wings, that is not simulated in DCS. The wings will be deflected always fully until bomb overcorrects it to target, then it will reflect to another direction fully until again overcorrects, and it repeats this method until it is pointing at the target.

 

But because bomb is aiming always straight to target, it doesn't mean it's wings has enough angle of attack to make it fall on the target. Kinematic energy, aerodynamic lift and all doesn't allow GBU-12 to glide toward target even when it points at it.

 

It would need to start guiding over the target in first moment, otherwise it doesn't have changes to impact on moving target.

 

And this doesn't even matter as 250 kg bomb should be very effective against MBT from 100-150 meters impact radius.

 

You basically don't need to hit target, just get the bomb 30-60 meters from it to likely disable it.

[LastRifleRound]

Should do so.... GBU-12 ain't capable track moving targets. That is the AGM-65 Mavericks purpose.

 

The GBU-12 can hit moving targets, if they move slow, like a 10-15 km/h. A walking man speed is about 4 km/h and jogging a 6 km/h. So it is about cyclist speed it can hit at around 10-15 km/h.

 

The new GBU-49 is designed for that. It has dual-seeker, Laser and GPS guidance, and it has proportional navigation for moving targets so it will measure distance to target and calculate intercept point to it.

 

The GBU-49 guidance is as well proportional, it's wings can be deflected proportionally so it can fly more effectively against high wind or make better corrections.

 

The GBU-12 has so called "bang-bang" wings, that is not simulated in DCS. The wings will be deflected always fully until bomb overcorrects it to target, then it will reflect to another direction fully until again overcorrects, and it repeats this method until it is pointing at the target.

 

But because bomb is aiming always straight to target, it doesn't mean it's wings has enough angle of attack to make it fall on the target. Kinematic energy, aerodynamic lift and all doesn't allow GBU-12 to glide toward target even when it points at it.

 

It would need to start guiding over the target in first moment, otherwise it doesn't have changes to impact on moving target.

 

And this doesn't even matter as 250 kg bomb should be very effective against MBT from 100-150 meters impact radius.

 

You basically don't need to hit target, just get the bomb 30-60 meters from it to likely disable it.

 

Happens with BRMs too. This might because of using the beam riding logic or what, but it shouldn't happen

 

With the GBU I can tell you it will miss with almost every aircraft unless you lase early, for a lot of the reasons Fri mentioned.

 

I forget how to manually lase in the JF17, but when I'm flying the hornet and I need to hit a moving target with a GBU, I make sure I activate the "Trigger" mode and lase almost as soon as the bomb comes off the jet. I almost always hit a full speed tank using this technique. It's actually taught in one of the A10 training missions.

 

If you're lasing in the A10, I make sure the bomb fall is optimized for the laser "basket" in the DSMS, then again, I lase almost immediately.

 

You can try this in the JF17 and see if it works for GBU. For BRMs, I have no idea why they do it or how to fix it. I'm guessing it's a bug there.

[Shrike88]

Noticed however, I have tried flying parallel and dropping from behind the vehicle so the weapon is dropped behind and in line with the fast moving target. Have had better luck adjusting attack heading and altitude but still not 100%