Odd gun behaviour

[Dr Zaius]

I’m just learning the Harrier so please bear with me, instant action / AG Gun and Rockets mission there seems to be a zone near the target in which the gun will not fire, I cant work out if its altitude related or slant range but as soon as I overfly the target i can fire the gun no problem - I’ve tried changing the min / max settings but im not sure of the logic and/or if they even do anything?

 

I love harrier a hell of a lot but ot seems to be fighting me every step of the way ????

[ChickenSim]

@Dr Zaius they recently implemented a minimum RPM to fire the gun - are you bringing the throttle to idle in the dive?

 

Based on your description it sounds like the gun starts working again after the overflight because you push the throttle forward to go around.

[Dr Zaius]

Hey thanks ChickenSim, yeah i was throttling back and deploying the airbrake,

too, I’ll give it a try with some rpm’s on the engine, do you know what the workable range is?

[Dr Zaius]

Not to worry, i’ve just read your super helpful remarks in an older post!

 

 

11-18-2020, 08:43 PM

The GAU-12 is pneumatically actuated, and requires at least 60 PSI of bleed air generated by the engine in order to fire.

 

In order to generate 60 PSI of bleed air, you need to set a minimum throttle (Fan RPM %) setting. This scales with speed and altitude.

 

At sea level, traveling M 0.8 or more, you need a minimum power setting of around 60%. At sea level, slower than M 0.8, you may need up to 70%.

 

At high altitude (20,000+), you could need upwards of 90% to fire the gun.

 

Consider keeping that throttle full during an attack run.

 

 

[ChickenSim]

The 12 o'clock position on this reticle starts to unwind at 6,000' (right now) but you can hypothetically begin to fire even before this if you're diving steep enough.

 

If they bring the Harrier up to the latest software standards, 12 o'clock will become 15,000' and you'll have a little more information to make a better decision with.

[ASW]

Thank you for your answers! I'm already exhausted. Even reassigned the firing button on the joystick.)

[HedgeSlammer]

Ah, thanks Dr Zaius - I was having this exact same issue yesterday and couldn't work out what was going wrong.

 

It would be great if there was something in the cockpit that told you if you were below the min PSI to fire the gun, but I guess that would be no fun!

[YoYo]

Thx, its something new from when I flew Harrier last time :). Today I noticed the same "problem" :).