Subscribe to download
ARM MK2 - An APN-based Target-Leading Missile

A very basic, no-frills APN-Guidance missile. My objective here was to develop the smallest target-leading, active RADAR missile I could, so I settled on a sort of digital emulation of AIM-9 tracking as described in this article:
https://en.wikipedia.org/wiki/Proportional_navigation

Unlike the other APN missiles I've seen here, this works based only on the information coming from the radars and never derives GPS coordinates. This makes it probably a bit less accurate than those, but the upshot is it can be a lot smaller, and the tracking isn't bad for the size of the package. It takes some doing to evade, even in fast-ish aircraft. It still manages to land kinetic kills on me 25-50% of the time while evading hard, and even more consistently if fired in quantity. I also included a pair of flare launchers to simulate an airburst in anticipation of actual warheads. If you count airbursts, the accuracy is quite a bit higher.

2km fuel range, though it's willing to track out to 5. Fairly accurate at most ranges but better at longer ranges.

Do whatever you want with it, though I'd appreciate credit if you post something using it. It's totally fire and forget, so you've only to attach it to a pylon and hit the launch order. I've included it with the launch gantry I used for experimentation. To the couple of people on the discord and my friends list who helped me develop this thing: thanks.

Semi-Active missiles and (more feature-complete) variations on this active missile to come.