How do aim120s work

ive been trying to use the aim120/rb99 all day and it’s like trying to use aim9js all over again, the missile just forgets what its doing and nosedives into the dirt or detonates/breaks off right before its about to hit. i cant even guarantee a hit unless i fire within 7km yet everyone else with fox3s is nuking me from across the map despite using every maneuver there is. sometimes the missile just wont track someone flying in a straight line making zero effort to evade. i have no clue what im doing wrong

Do you have a replay link to share? It may be easier to go into your replays and inspect the sensor view to see what your missile is doing.

yeah do you want me to get close or try to sling it across the map like everyone else does

Either or, whatever you can do to recreate the issue.\

If you can replicate the issue, head over to Gaijin Entertainment - Single Sign On and share the link, please.

it would appear that it randomly detonating is the missile clipping a tree or a tiny piece of terrain i cant see, i havent changed my gameplay at all but my missiles are hitting now so i dont know what the issue was

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Aim-120s are ARH, meaning they can track a target on their own, and you don’t need to maintain lock like you do with Aim-7s and other SARH missiles.
They also travel much further depending on how high up you are when you fire them, or also how fast you are going when you let them off the rail.

As it’s a radar guided missile, it’s still affected by multipathing (if you don’t know what that is, just ask and I’ll explain it).

Currently, all ARH missiles pull 32Gs or more, meaning unless they’ve run out of energy, they can’t be kinematically dodged by simply turning. You can bleed their energy using specific tactics to make the missile constantly overload and constantly re-correct. There should be some guides about it on YT if you don’t know about them or are interested in learning about it.

The best way to defeat a ARH missile is to be out of its range, bleed its energy or to chaff it or notch it.
Currently, ARH missiles are easily chaffed in rear aspect, however in direct rear aspect they tend to maintain lock quite well. They can also be chaffed in a 90 degree notch quite easily.