My Trek – Part 4

When the Klingons and Romulans get squirrelly, it’s time to send in the USS Enterprise, phasers a-blazing to send those jokers back across their respective neutral zones. To handle a situation like this in my Star Trek campaign, I needed some spaceship battle rules, and I wanted a set of rules that would be quick and easy. Since I write lots of games these days, I figured I might as well write them myself, with a little inspiration from Starfleet Battles and the Star Trek RPG I’m using for the campaign.

I might spread these rules out over a couple posts. They’re pretty concise rules, but they’re not “blog concise”. I’ve made these rules neutral in terms of the jargon so CBS/Paramount doesn’t sue me, but I think you can figure out what’s what.

Spaceship Battles

Copyright 2019 John M Stater

Spaceship Battles is a spaceship combat simulation game using a simple gridded mat, counters or miniatures to represent spaceships, a full set of dice, pencils and paper. There is theoretically no limit to how many players ca play the game, although play by more than 6 players would likely be difficult.

Spaceship Specifications

Ships are ranked by their size and by three systems, engines, force fields and weapons. Systems have three factors to represent their potency – from I to III. A system’s current factor is determined by the power directed to it and system damage.

Each ship begins the game with 8 power points (PP). Power points are allocated to the ship’s systems to determine that system’s current factor. Factor I requires 1 PP, factor II requires 2 PP and factor III requires 3 PP.

Ship Size

A ship’s size determines how many hull points it has and how maneuverable it is. Hull points (HP) measure how much damage a vessel can take before being destroyed. Maneuverability (MVR) determines how many spaces a ship must move forward before it can rotate one quarter turn and then continue to move.

Note that Class F ships are assumed to operate in squadrons of three vessels.

Size Class HP MVR
A—Battleships, Carriers, Colony Ships 60 3
B—Battlecruisers, Heavy Cruisers 48 2
C—Cruisers 36 1
D— Destroyers, Frigates 24 1
E— Corvettes, Scouts, Transports 12 0
F—Shuttles, Fighters 6 0


Engines determine a spaceship’s maximum speed. The spaceship’s actual speed during a turn of combat is determined by its captain. Ships can move at two sub-light speeds – half and full, and ten different hyper speeds, from 1 to 10. A combat turn is divided into twelve phases, and a ship’s current speed determines during which phases it moves a space.

Force Fields

Force fields protect a ship from damage. The more power directed to force fields, the harder it is to damage a ship. See the Combat section for more information about how force fields work in the game.

Factor Type I Type II Type III Type IV Type V
I 1 2 3 4 5
II 2 4 6 8 10
III 3 6 9 12 15


There are two main types of weapon, energy and projectile. Energy weapons rely on power, so the more power that is directed to them, the more damage they inflict. Projectiles are not as limited.

Most weapons are located on the fore section of a ship, and are given a 180-degree forward arc. Ships with aft weapons can fire in any direction.

Energy weapons can be used during each firing phase of a turn. Projectile weapons can be fired once per turn, unless the ship has rear weapons, in which case the projectile weapons can be fired twice per turn, but only once in each direction.

Energy Weapons

The primary weapons of a spaceship are energy weapons. The more power that is fed to these weapons, the more damage they can cause. The most common weapons are as follows:

Factor Type I Type II Type III Type IV
I 1d6 2d6 3d6 3d6
II 2d6 3d6 4d6 6d6
III 3d6 4d6 5d6 9d6
Range 9 9 12 9

The number indicates how many dice are rolled when the weapon attacks. See combat for more explanation.

Type IV weapons lose their potency at longer ranges. You can use the following table to determine the number of dice rolled on a Type IV attack based on range.

Factor 1 2 3 4 5 6 7 8 9
I 3 3 3 2 2 1
II 6 6 6 5 5 4 3 2 1
III 9 9 9 8 8 7 6 5 4

Projectile Weapons

Torpedoes and missiles are not powered like energy weapons. They can be used with just one power point directed towards weapon systems. Projectile weapons always have the same attack value. Ships have a limited number of projectile attacks, usually 6 for Class D/E/F ships, 9 for Class B/C ships and 12 for Class A ships.

Missiles Torpedoes
Attack Dice 4d6 6d6
Range 9 9

Tractor Beams

Most spaceships are equipped with a tractor beam. To use a tractor beam, one PP must be directed to it. The ship can then tow another willing ship no more than one space behind it, or can attempt to tow an unwilling ship.

An unwilling ship must first be caught in the tractor beam. A tractor beam has a range of 3 spaces and rolls 3d6 to attack. If this attack is successful, the tractor beam catches and holds the target. The target then has a chance in subsequent turns to break away. This chance is based on its current speed, as follows:

Speed Chance to Break Away
Sub-light Roll 6 on 1d6
Hyper 1-5 Roll 5-6 on 1d6
Hyper 6-10 Roll 4-6 on 1d6

A ship caught in a tractor beam cannot move on its own, but can be dragged (see above). A ship in a tractor beam can still fire its weapons.

Boarding Parties

A ship can transport a boarding party (about 6 people) to a target if the target has no force fields operational and both ships are moving at the same speed. The boarding party can be targeted at the enemy ship’s bridge, engines, force field generators or weapons.

A boarding party attacking a bridge must roll a 6 on 1d6 to succeed. If they succeed, they control the enemy ship. Against other systems, a boarding party must roll a 5 or 6 on 1d6 to succeed. If they succeed, they take that system offline until they are repelled.

A boarded ship has the same chances of success to repel as the boarders had to board.


A ship itself can be used as a weapon by ramming into another vessel. To ram, one vessel must move into the space of another. To make contact, one must roll a “6” on 1d6. Modify the number needed to hit down by one for every two levels of speed faster the attacker is than the defender. Thus, a ship traveling at Hyper4 trying to ram a ship at half-SL is traveling at 4 levels higher and modifies the number needed to hit down two, from “6” to “4 to 6”. If the ramming ship is traveling at a slower speed than its target, it always fails to ram.

The ramming ship does damage equal to its normal hull point value (i.e. hull points without damage) to the rammed ship, and vice versa. The defender’s force fields reduce this damage as normal.

Example: A destroyer traveling at Hyper5 attempts to slam into a heavy cruiser traveling at Hyper3. It is traveling two speed levels faster than its target, so it needs to roll a 5-6 on 1d6 to hit. If it succeeds, it deals 36 points of damage. Assuming the cruiser has a force field value of 12, it would lose 24 hull points. The destroyer would lose 48 hull points minus its force field value.

Invisibility Device

An invisibility device allows a ship to hide from other vessels, though not perfectly. Attacking an invisible vessel is done at a penalty of 6 points from the attack roll. A ship must direct 3 PP to an invisibility device to use it. While a ship is invisible, it cannot attack. A ship can become visible and attack during an attack phase, but cannot become invisible again until the next attack phase. Power points no longer used when a ship is visible are not re-assigned until the next Phase Zero.

I’ll continue these rules next week, with an explanation of how combat works and how you assemble a fleet for a battle.