TEXT: 4b. Vehicular Combat
  Revolution ver 1.0 – 15-Oct-2016. The following text is designated as Open Game Content.
  This chapter provides a basic framework for vehicular combat. The basic rules for Conflicts are already enough to run 
  simple action scenes involving only vehicles, but for combats you will probably want to use a system that grants a 
  higher level of detail for vehicular weapons and equipment. This sub-system is intended to be a complement for Basic 
  Combat which handles vehicles, and as such does not assume that you use any of the Advanced Combat rules, although 
  it introduces a simplified version of concepts found also in Advanced Combat like Toughness and Armour Points.
  Vehicular combat follows principles that are a bit different from man-to-man combat. Strike Rank will reset at the start 
  of a new Round, unlike it happens in Basic Combat, but vehicles do not spend Strike Rank for each action like living 
  creatures do in Advanced Combat. Movement has a great impact on combat among vehicles, and most rules for 
  vehicular combat will deal intensively with movement.
  Finally, these rules  represent confrontations between fast vehicles, such as tanks and helicopters, or fighter and bomber 
  aircraft. Capital ship combat should be run differently, although we will devote a small section to it at the end of this 
  sub-chapter.
  Round Sequence
  Combat is divided into six second rounds, during which each vehicle can perform one or more actions. Every combat 
  goes through the following steps:
  1. Combat Setup: At the start of combat all players check any Consequences carried over from Adventure Time and 
  similar disadvantages.
  2. Statement of Intents: The Narrator declares what non-player characters will do, as long as it is something that is 
  visible to the player characters. Then all players declare, in ascending INT order, what Actions their vehicles will 
  perform during the Combat Round. Each vehicle pilot picks a number of white, green or red tokens representing the 
  effect of vehicular movement on combat, and keeps them until the end of the round. The Strike Rank for that Round is 
  then determined for each player and non-player character, according to the stated intents.
  3. Vehicles Take Action: All vehicles perform their intended Actions in descending Strike Rank order. The vehicle with
  the highest Strike Rank will go first, followed by the one with the second-highest Strike Rank, and so on until the last 
  vehicle has acted. Reactions, such as evasions or counter-measure use, are made during this process as appropriate, but 
  pilots can wait until they are actually threatened before declaring how they react. 
  4. End of Combat Round: Once all eligible vehicles have acted, the Combat Round is over. All check-marks are 
  erased from Strike Rank tracks, and all tokens are dropped. If there are still vehicles engaged in combat with enemies, 
  go back to point 2 and start another combat round. Otherwise the Time Scale can be moved to Adventure Time.
  Combat scale
  Vehicular combat takes place on a different scale than individual combat. The distances travelled are far greater, the 
  range at which combat exchanges take place is usually much longer, and the damage is often devastating. Zones and 
  ranges for land vehicle combat are the same you would use in personal combat. However, vehicles can move more 
  zones than a character, and can still fire after moving one or two zones. They do not suffer Penalties for firing within the
  Effective Range of their weapons without aiming.
  For aerial or space combat, normal range and distances are greater. Multiply everything by ten as described in the Aerial
  Combat section. Battles that involve only helicopters are best kept on the ground scale.
  Damage is expressed in damage points like it happens in Basic or Advanced Combat. However, each point of damage in
  Vehicular Combat corresponds to ten points of Basic/Advanced Combat damage. Likewise, each point of vehicular 
  armour corresponds to ten AP's in Advanced Combat.
  For instance, in Chapter 5 we will learn that a modern AT rocket does 2d20+10, or 12 to 50 points of damage, on the 
  personal combat scale. On the vehicular scale, this will translate into a 2-5 range, or 1d4+1; enough to pierce the 
  armour of most WW2 tanks and the lightest modern models.
  Statement of Intents
  At the start of each Round, the players and the Narrator will plan each vehicle movement, determining its trajectory and
  the position in which it will terminate its movement. This allows them to calculate the exact Strike Rank on which this 
  movement and all other actions will take place. 
  
  Movement tokens
  In order to help Statement of Intent, vehicular combat introduces the concept of movement tokens. These are abstract 
  units used to remind you about what your vehicle has performed or is about to perform during the current combat round,
  although we suggest that you use actual coloured tokens for ease of book-keeping.
  Tokens are divided in three groups, identified by their colour
  •
  Green token: represents how difficult to hit your vehicle has become because of its swift and unpredictable 
  movement, and bestows a Penalty on your enemies.
  •
  White token: this token is the most commonly used token, and it counts as both a green and a red token when 
  determining how many tokens of a given colour you have. It bestows a Penalty on both you and your enemies.
  •
  Red token: represents how movement has delayed and impaired all attacks and actions performed by your 
  vehicle. It bestows a Penalty on your rolls but not your enemies'. 
  Whenever the rules tell you to take a token, take a token of the exact colour specified. Whenever instructed to count red 
  or green tokens, count white tokens among both red and green tokens. 
  Example: a vehicle has one white token and a red token. If counting green tokens, it has one (the white token). If 
  counting red tokens, it has two (the real red token and the white token).
  Declaring Movement
  When evaluating vehicular movement, consider that all movement within a zone costs nothing in terms of tokens. It just
  takes place at the appropriate Strike Rank for the vechicle. Each full zone moved costs the vehicle one white token. No 
  vehicle can move further than its basic Move in zones. All tokens picked because of movement after the third are red 
  tokens, not white tokens. The first white token picked by a flying vehicle is always replaced with a green token.
  VEHICLE MOVEMENT TABLE
  Movement in zones
  Land Movement in metres
  Air Movement in metres
  Tokens picked
  Within same zone
  Within 15 metres  (9 km/h)
  Within 150 metres  (90 km/h)
  No tokens
  One zone
  Within 30 metres (18 km/h)
  Within 300 metres (180 km/h)
  One white token
  Two zones
  Within 60 metres (36 km/h)
  Within 600 metres (360 km/h)
  Two white tokens
  Three zones
  Within 90 metres (54 km/h)
  Within 900 metres (540 km/h)
  Three white tokens
  Each further zone
  Each further 30 metres
  Each further 300 metres
  One extra red token
  Determining Strike Rank
  During Statement of Intents Phase, after determining their plan for the current Round, players whose vehicle will move  
  calculate their Strike Rank by checking the number of tokens they have picked. The Narrator does the same for all non-
  player characters, noting which vehicles act at a Strike Rank which is lower than DEX.
  Strike Rank is based on the DEX of the pilot. However, if a vehicle has more than one crew, consider the main gunner's 
  DEX if the vehicle is trying to fire that round, and the pilot's DEX if it is just manoeuvring. This value is treated as the 
  pilot's DEX for the duration of that Round.
  White/Red tokens
  Strike Rank
  Up to one
  DEX
  Two
  DEX -5
  Three or more
  DEX -5, and can only move and not act
  If the final Strike Rank is zero or less, then the vehicle cannot attack that round, and its Strike Rank drops to one. 
  
  Vehicular attacks
  During the Action Phase, each vehicle executes its movements, attacks and other actions according to its stated plans. In
  general, a player may change his or her statement of intent once the planned Strike Rank arrives,. However, this will 
  always add one extra red token to the standard cost of the new actions, which may imply that they become impossible.
  Target range and line of fire
  The validity of the range for a planned attack, as well as the presence of a line of sight, must be checked using the 
  position of the target during Statement of Intent and the presumed position of the attacker after he or she has performed 
  the planned movement. If range or obstacles do not allow the attack, then the player can neither declare it during the 
  Statement of Intents phase, nor execute it during the Action phase.
  It may happen that the intended target is no longer in the expected position after a vehicle executes its move. If this is 
  the case, and the attack becomes impossible, then it must be aborted. If the attack is not impossible, it will be carried 
  over with the range and modifiers related to the new position of the target. 
  It may also happen that a target is not yet in the position for which the attack is declared when the attacker's Strike Rank
  comes, but it has declared a movement that would bring it there for a subsequent DEX Rank. In this case, the attacker 
  can delay the attack until a subsequent Strike Rank at no penalty. The target can abort its movement to avoid being hit, 
  but this will cost it the extra red token for altering intents.
  Modifiers to the Attack roll
  Most attacks in vehicular combat are ranged attacks. For each green or white token the target has, an attack suffers one 
  Penalty. For each red or white token the attacker has, the attack suffers one Penalty.
  Vehicular weapons are more precise than individual ones, and they can always fire within their effective range without 
  any Penalty. For each Range Category beyond effective Range, an attack suffers one Penalty. Firing Bursts provides a 
  Bonus as in personal combat.
  Ranged defence
  Vehicles can evade projectile and beam weapons, although such a feat is not necessarily easy. Ground targets can only 
  evade missiles by rolling their driver's Drive skill with a Penalty. They cannot evade gunfire or beam weapons. Flying 
  vehicles can evade any kind of attack with a normal Pilot skill.
  Evasion rolls are influenced by tokens, but less than attacks: they ignore the first two red/white tokens, and become 
  impossible when the defender has three or more.
  Missiles
  Missiles are inaccurate weapons that can deal a lot of damage. Missiles are ideal for use against big, slow targets, as 
  they are easy to evade for aircraft but impossible to avoid for capital ships or bases. Due to its limited speed, evading a 
  missile fired outside its normal range receives a Bonus, which in the case of a ground target offsets the inherent Penalty 
  for evading on land. 
  The best defence a slow target has against a missile is countermeasures. Countermeasures are used with an Operate 
  [specific countermeasure] roll that opposes the attack roll. Turrets specialised in anti-missile fire are treated as 
  countermeasures, although they can also fire at aircraft.
  Missiles are not very precise weapons. Missile attacks cannot score an Advantage, no matter the roll. 
  Hits
  When a vehicle is hit, roll for the location hit and then roll for weapon damage. Subtract the armour that protects that 
  specific location, and apply the remaining damage to the Toughness of the area hit.
  Damage is always cumulative for vehicles. Damage from each hit is added to any previous damage until total damage 
  equals or surpasses Toughness. If an Advantage was scored (remember, missiles cannot score Advantages), the attacker 
  can choose the location hit.
  
  Each point of damage that affects Toughness can destroy or disable sub-systems present in the location. Each sub-
  system is identified with a number in the vehicle description. The equipment marked with the same number as the unit 
  die of the attack roll is hit by the first point of damage inflicted. For each point of damage after the first, roll 1d10 and 
  disable the appropriate component. Any roll of “0” on either the unit die or a d10 means that the attacker can choose the
  disabled component. Disabling an engine can blow up a craft if the pilot or chief engineer fails an Operate roll. A 
  vehicle with a disabled engine can still move if it has additional ones, but all Pilot rolls will suffer one Penalty.
  Once the Toughness of a location has been reduced to zero, it is disabled and all components in it cease to function, 
  although this will cause an explosion, when the location contained an engine or other potentially explosive materials, 
  only if the specific sub-system was hit. For most ships, sinking is just a matter of time once one of their locations is 
  destroyed.
  Aerial Combat
  This section includes detailed rules for aerial and space combat. We will use the term “aircraft” to indicate anything that
  can fly, either in space or in the atmosphere. 
  First Token Rule
  Whenever an aircraft moves and the rules decree that it has to pick one or more white tokens, replace the first white 
  token picked with a green one. This represents the intrinsic difficulty of hitting a flying target.
  Aerial ranges
  Whether you use zones or actual distances, aerial combat ranges and movement allowances are ten times as big as their 
  equivalent on the ground. Multiply everything by ten to obtain plausible zone sizes and range distances for aerial 
  combat: one zone is 200-300 metres, short range is 500 metres, and so on. This means that one zone on an aerial 
  battlefield may be the equivalent of a whole ground battlefield.
  Even though distances are greater in aerial combat, the numeric ranges given for vehicular weapons are valid when the 
  vehicle is flying or is firing at an airborne target. This represents the fact that it is much easier to have a clear line of fire
  when one or more of the combatants are airborne. The only difference with ground-based combat is that all kinetic 
  (except HE), laser or particle weapons used beyond Medium aerial range have their damage halved, no matter what 
  their listed effective range is. Missiles, which are not so effective on the ground, become more useful when launched 
  from a spacecraft, as they will still be able to deal full damage when launched from kilometres away.
  Minimum Movement
  While an aircraft is moving in the atmosphere, it cannot stop completely unless it can hover. It must move a minimum 
  of one zone, which will give it one green token, according to the First Token Rule. Whenever the vehicle is not moving 
  at all because it is hovering, it will not gain this green token, thus becoming an easy target.
  Firing arc
  Weapons not mounted on turrets can only fire straight in front of the firing vehicle. While this is usually of limited 
  importance for ground vehicles, which can easily make a turn within the time frame of one Combat Round, it becomes a
  major inconvenience for aircraft, which are always facing in the direction of their last movement. At the same time, the 
  enemy will undoubtedly try to be as far as possible from an aircraft firing arc when its Strike Rank comes, so the 
  vehicle might have to perform some manoeuvres to keep its target in the line of fire. 
  When firing at another aerial target that is not immobile or moving directly towards you, you must make sure to end 
  your movement with the enemy exactly in the direction your craft is facing. You can usually end your movement facing 
  a direction which forms up to a 45 degree angle with the one your aircraft faced at the start of the Round. You can 
  attempt to make greater turns, up to 90 degrees, by succeeding in a Pilot skill roll, modified by any red/white tokens you
  have. Few aircraft can make turns of more than 90 degrees, and those that can receive a further Penalty to the roll in any
  case.
  The Pilot Skill roll to keep the enemy in your firing arc must be made after making your move and just before firing. 
  The roll is not opposed. The enemy pilot will have a chance to evade the attack itself,  according to the rules for aerial 
  defence. A failed roll will force you to pick an extra red token, possibly delaying your attack or making it impossible 
  (remember that three red tokens mean automatic failure).
  
  Capital Ship Combat
  Some naval or space battles will feature one or more capital ships or space stations. Each ship can constitute a separate 
  battleground for personal or vehicular combat and occupy one entire zone on the in-flight battleground. Capital ships 
  may change facing by no more than 45 degrees per round during combat, and even this simple manoeuvre requires the 
  helmsman to make a successful Pilot Skill roll. A capital ship receives no tokens when moving, and is always 
  considered immobile when firing, as its velocity is extremely stable and its effect on accuracy is easy for its firing 
  computers to calculate (or for its experienced skipper to guess if your game is set during the age of sail).
  When a smaller vehicle hits a ship within normal weapon range, the location where the blow lands is not rolled but 
  chosen by the firer. If the roll is an Advantage, the attacker can choose even the single subsystem targeted, hoping to 
  disable a vital system. Capital ships cannot evade any attack but they are often equipped with heavy armour or energy 
  shields or even more frequently with point-blank guns, usually mounted in turrets, that they use to intercept incoming 
  missiles. Apply the rules for countermeasures to these guns. Player characters are often found manning these devices in 
  battle.
  Capital ships can fire any number of weapons per round, as each weapon is supposed to be operated by a separate 
  gunner. When a capital ship attacks another capital ship, given the long range of ship weapons, the two are hardly ever 
  located on the same map. Combat between capital ships is better handled at a more abstract level if you are not 
  employing a specific advanced sub-system designed for this purpose.
  
SOURCE: textdata/thevault/Revolution d100 SRD/RD100-SRD-04b - Vehicular Combat.pdf