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Published by Samuel Penn.

Also, see my profile for things that interest me.

Glendale Website - My main web site.

Yags - Main site for yet another game system, a generic GPL'd tabletop RPG.

Yagsbook - Documentation on the Yagsbook RPG documentation format, a Sourceforge project.

Mapcraft - Documentation on world mapping tools, another Sourceforge project.

Midnight Saga - An Ars Magica campaign.

Active Topics

The current topics are currently under active development (relatively speaking).

Yags is Another Game System - Game design notes for Yags, a Free roleplaying game system I use as the core system for most of my campaigns.

Yagsbook - Notes on an XML based documentation system I use for documenting Yags and related campaigns.

Full Thrust - Notes on Full Thrust

Stargrunt - Notes on Stargrunt.


Railguns and Mass Drivers

Early technology, pretty much dropped by TL10. A kinetic energy weapon, relies on firing dumb projectiles at the target. Railguns tend to use lots of lighter projectiles, while a mass driver uses a smaller number of heavier projectiles. Mass drivers may use high explosive rounds, or even micro-nukes.

  • Rated according to guesswork, mostly based on KE of projectiles.
  • Damage done by a railgun or mass driver is log(MJ) * 60.
  • Each multiple of short range, railguns do -10 damage.
  • Mass drivers do not drop damage with range.
  • Mass drivers count as a Hv weapon.
  • Railguns have a -2 penalty to effective size for damage purposes.

The real problem they have is that over any significant distance, accuracy is appalling. Mass drivers do not drop damage over range. Railguns do, since they rely on lots of projectiles hitting the target, which tend to spread out over distance.

Turret Railguns

Railgun turret mounts are either light or heavy. Fixed mounts are always facing forward, and normally only mounted on fighters. Heavy versions have a higher muzzle velocity, but use the same projectile type.

TL Weapon Atk Dmg Inc Short Size
8 50MJ Railgun +2 +100 1” 5” 8
8 150MJ Heavy Railgun +5 +130 2” 5” 13
9 75MJ Railgun +2 +110 2” 5” 8
9 225MJ Heavy Railgun +5 +140 3” 5” 13
10 100MJ Railgun +2 +120 3” 5” 8
10 300MJ Heavy Railgun +5 +150 4” 5” 13

A fixed mount is as per a light railgun turret, with the following modifications:

  • +4 size
  • -2 attack

A railgun Light Turret has 15 turns worth of shots. A Heavy Turrett has 25 turns of shots.

Turret Mass Drivers

Mass drivers use heavier, slower projectiles than railguns. They also tend to fire a much smaller number of projectiles.

TL Weapon Atk Dmg Inc Short Size
9 100MJ Mass Driver +0 +120 1” 5” 10
9 300MJ Heavy Dass Driver +2 +150 2” 5” 15
10 150MJ Mass Driver +0 +130 2” 5” 10
10 450MJ Heavy Mass Driver +2 +160 3” 5” 15
11 200MJ Mass Driver +0 +140 3” 5” 10
11 600MJ Heavy Mass Driver +2 +165 4” 5” 15

At TL9+, there is the option of HE warheads for the projectiles.

  • HE rounds do +10 damage and count as +2 size.

At TL11+, there is the option of micro-nuke warheads. These are very expensive, so rarely used, plus are negated by any target using Nuclear Dampers.

  • Micro-nukes do +100 damage and count as size +15.


Railguns and mass drivers do not come in barbette mounts.

Bay Railguns

Railguns and mass drivers do not come in bay mounts.

yags/starships/weapons/railguns.txt · Last modified: 2015/02/04 22:40 (external edit)