Disclaimer: Following these guidelines is completely optional, but are still here for players who want to play competitively, challenge their creativity through self-imposed restrictions, or have some semblance of balanced combat. Above all, just be kind, honest and respectful to other players, and have fun!

"If you have to say it is technically legal, it is most probably illegal."
-Sun Tzu, The Art of War

General rules:

-Do not clip any ACF components or seats inside of each other, like seats inside of the gun, engine inside of ammo, and joining engines at the crankshaft. Stuff can touch, but not be inside each other. Remember, be wary of your main gun when it elevates, as the breech often moves down into the hull, which can clip components there.

-"Overlapping" is decided by the smallest possible interpretation, so there are no complaints or confusion. Overlaps of 1-2% aren't considered a big deal. If questionable ask admins.

-Critical components should stay within your vehicle, or, at the very least, be vulnerable. Don't place them outside of the world or in a separate 50 ton box.

-Don't put ammunition inside of a solid, armored prop to mitigate ammo cook offs. Props can still clip with ammo, but not in any way intended to minimize potential explosions.

-Don't jettison ammunition crates from your vehicle before they explode.

-Don't use holos or other non-physical entities to mask the interior of your vehicle.

-The only alternative to guiding missiles with hitpos is rangers. No exceptions.

-No floating guns. Small caliber weapons are the only exception.

-Don't make armor invisible. It doesn't matter what sort of mental gymnastics you use to justify it, if it's impossible to see or difficult to see it's illegal. The only exception is glass, which should, at most, be as strong as you'd expect real ballistic glass to be.

-If you see a vehicle that's flipped over or still recovering from flipping, please be considerate and give them time to fully recover.

-Don't stuff your gun into another vehicle, or drive straight into/through someone's vehicle. Seriously.

-While this falls more into the realm of building advice than rules, please try to keep your vehicles optimized. Go easy on prop count and entity count; if you have to look at it, you have to render it and your frames will suffer. Other things such as lower wheel count, lower constraint count, lower E2 count, parenting whatever possible, keeping visclip to a minimum and only using when needed, etc. etc. all help to reduce serverside and clientside impact.

-ABSOLUTELY NO EXPLOITS. Exploits are defined as taking advantage of bugs and oversights in ACF, or using other tools to enhance your vehicle's performance in an unfair and unintended way, such as:
1. Using setMass or gates to control armor characteristics or circumvent your vehicle's total weight.
2. Using fading door, visclip, make spherical, or other means to make criticial components of your tank invulnerable.
3. Setang aim and wire spawners.
4. Using the E2 functions E:Propdraw / E:propnotsolid is not allowed on any components of your vehicle, including armor/props -- Only use it for detail props.
5. Using E2 functions such as applyforce, fin on wheels, or excessive downforce to unreasonably enhance the mobility of your vehicle (only applies to ground vehicles, but do be reasonable with other vehicle types).
6. Entity tracking & player tracking. Fire control systems are fine, but keep it reasonable, don't make an auto-tracking 100% accurate orbital spergebeam
7. Modifying the fire rate of guns. If an individual gun fires faster than God intended, it's not allowed.
8. Lowering the weight of ACF components. If it works, weighs less than it should, it ain't no good.
9. Preventing ammunition crates from exploding in any way shape or form.
And the list goes on. If you do one thing along these lines, don't even pretend you're clever or sly—you may as well disregard every single other rule.

Ground vehicles:

-Your pod must be an ACF seat or breen chair and cannot be angled more than 45 degrees. If you wish to use a vanilla seat (such as an airboat seat) and place it at a greater angle, it must reside within the turret. Vanilla seats may be placed freely in light, medium and casemate vehicles, so long as the seat is angled no more than 45 degrees.

-If your pod is not at least partially in your turret, you must have either ammo or critical wire components within it. Please be reasonable—not just a bit of smoke ammo or a couple rounds for your main gun. It should be fairly volatile if it explodes.

-Turrets must have a turret hole/ring -meaning an open-air connection between the tank's hull and turret- large enough to accommodate the breech of your weapon. No part of your gun should significantly clip with the turret hole/ring when it elevates. Oscillating turrets, rear axis guns, dual axis guns, external gun turrets, or any system which prevents the breech of your gun from depressing into the hull is exempt from this rule.

-Guns must move within an armored cavity, meaning you can't stick a block on the roof of your turret to enhance its gun depression. Cleft turrets and similar turret designs in which the gun is only partially housed within the turret are exempt, to include exemptions from the above rule.

-Low profile and unmanned turrets are fine, but the above rules still apply. If your turret lacks any meaningful amount of ammunition and/or a chair, at the bare minimum have your pod controller and camera controller in the turret; don't make them impossible to hit by changing the model, or through other means. Your turret should be a critical part of your vehicle.

-The hull of your vehicle, regardless of weight, must be at least 36 inches/source units high (e.g. a size 36 sprops plate). Ground clearance and inert sections of the hull do not count.

-No internal drive sprockets. Link your transmission to external wheels.

Aircraft rules:

-Nominal armor should be no more than 40mm. Don't make your aircraft a flying tube or wedge covered in holos, make an attempt at a realistic airframe.

-Aircraft shouldn't be able to fly without control surfaces or means of propulsion. If your wings, tail, propeller, engine, etc. are missing, you should crash or have the decency to despawn.