ROT

[edit] On Infantry/Vehicle/Aircraft/Building Types

Determines the Rate Of Turn of this object and/or its turret, if applicable. Bigger number = faster turn.

[edit] On Projectiles

A non-zero value means this projectile can home-in on its target. A value of 0 disables homing behavior and leaves the projectile to fly straight.

On aircraft, a projectile with an ROT of 1 will fire the weapon in a strafing pattern of single projectiles until the target either moves out of range or the aircraft itself flies directly over and past the target regardless of what the weapons burst count is.
Mind that:

• setting a predefined flight path (via Arcing=yes / Lobber=yes and similar) ignores the ROT setting.

This needs Testing

The following section contains information that has not been personally confirmed by the revision's author; readers are encouraged to test it themselves and update the section accordingly.

• setting Ranged=yes forces the projectile to respect the weapon's Range setting, meaning it can only follow a target so long as the target is within the weapon's range from the location it was fired from. Reaching the limits of this range will cause the projectile to detonate. If "Ranged=" is set to "no", the projectile will follow its target indefinitely until it is either triggered to detonate (by hitting the target, Proxy fuse or maybe some other trigger mechanic that can be coded) or is destroyed (say by Firestorm) or the the target is destroyed by other means, which will cause the projectile to instantly detonate (which is true for any homing projectile).