*forum about a type of TL12 armor material called hyper dense ended up getting me thinking about the old skool grand daddy of sci-fi RPGS its self,*

**GURPS***. Or more specifically about the types of armor materials that the setting used.*

**Traveller**Why did I end up thinking about it? Well, going over that is a good chance to show my thought process on how I go about figuring out the hidden values

*uses.*

**GURPS**Sine the opening poster wanted to know its density, I tried to see if I could figure out what it was. Based on the figures listed in

**I was able to figure that hyper dense has a WM* of 0.04. Knowing that, all I had to do was just find some hint as to what hyper denses DR per inch was and I could then compute how much it weights. Basically to get a materials WM you take a materials density, divide it by 12 and then its DR per inch so by working this backwards I can figure a materials density. But... I scoured the forums for any hints dropped by**

*GURPS Spaceships**writers, poured through my books checking that per chance there was some figure I missed, put my Search/TL8 skill to its full use diving into the depths of Google but no matter where I looked I couldn't find any details that gave me a hint to what its DR/inch could be.*

**GURPS**Then I remembered that the writer of

*, David L. Pulver, is a bit of a fan of*

**GURPS Ultra-Tech***and several of the entries in the book are direct nods. Now I never played*

**Traveller****myself and only have skimmed through a few books in my time such as the excellent**

*Traveller***but I did know that it had a type of armor called super-dense. Super-dense seemed like a pretty good candidate for being the inspiration for hyper dense so I once again jumped on into Google and first found some numbers for the types of armor Traveller used that covered not only their densities, about 914lbs per ft^3, but even how much stronger they were relative to RHA steel!**

*Fire, Fusion and Steel*"Jack pot!" I thought.

*has canonically made RHA steel have a DR of 70 per inch since early 3rd edition so all I had to do to see if I was right was to take the listed densities for super dense and then multiply how much stronger it was to RHA steel by 70 and see if I got a WM around 0.04. Now it turned out there is actually three kinds of super-dense, regular O' super-dense which is 7× stronger, a stronger bounded super-dense which 14× stronger and then coherent super-dense, the strongest armor I could find in the setting, clocks in at 20× as strong . Crunching the numbers gave super-dense a WM of 0.16, bounded super-dense WM 0.08 and coherent super-dense got a WM of 0.05, close but not close enough.*

**GURPS**Another dead end it seemed and I felt about ready to throw in the towel when another Google link caught my eye. I clicked on it and found this little gem by

*forum regular, Anthony, which explained that*

**GURPS***hyper dense was twice as strong as*

**GURPS***bounded super dense. Running the numbers using 24× DR70... and what do you know? I got a WM of 0.039, which we can round right up to 0.04! That was it, I found it. The numbers lined up. So that gives hyper dense DR1,960/inch, WM 0.04 and a density of 914lbs per cubic foot.*

**traveller***Weight Multiplier, if you're new to

*or just how it stats armor I'll go over this more below.*

**GURPS**So, yeah. That's pretty much how I pick apart how

*works. I study the books, search the forum and dive into the interwebs and try to find bits and pieces I work together. It's almost like detective work in a way.*

**GURPS**But what would a post made be me with out some crunch in it? Since had to mess around with

*armor assumptions so I figured why not convert them over to*

**Traveller's***for anyone who wants a little*

**GURPS***flavor in*

**Traveller***their*

*.*

**GURPS****Armor Materials**

Here are the mot common armor materials I found referenced in Traveller.

**Iron**: Base quality wrought iron.

**Soft Steel**: Mild quality steel used by modern cars an ships.

**Hard Steel**: Rolled homogeneous Armor steel. Good quality armor grade steel.

**Light Alloy**: Modern light weight aerospace grade aluminum or titanium alloys.

**Fiber Glass**: One of the first non-metallic materials strong enough to be considered for structural use.

**Titanium Alloy**: High Grade titanium-aluminum alloy.

**Light Composite**: High Strength materials made up of composites of non-metallic materials. Early "Chobham" falls under this.

**Composite Laminate**: Next generation composite made up of a matrix of metallic and non-metallic materials. "Dorchester" is an example of this.

**Crystaliron**: A ferrous metal with a perfect crystal structure and carefully controlled impurities to gain maximum hardness and toughness.

**Super Dense**: Steel that has its molecular partially collapsed through artificial gravity fields for increased density and strength.

**Bounded Super Dense**: A more advanced form of super dense reinforced with dampening fields.

**Coherent Super Dense**: A next generation version of bounded super dense that uses dynamic computer controlled to maximize the the extra strength the dampening fields give it.

Material |
DR/In. |
WM |
CM |
Density |

Iron: | 35 | 1.2 | 91 | 487.5 |

Soft Steel: | 60 | 0.68 | 91 | 487.5 |

Hard Steel: | 70 | 0.58 | 114 | 487.5 |

Light Alloy: | 60 | 0.51 | 227 | 365.6 |

Fiber Glass: | 18 | 0.29 | 57 | 62.5 |

Titanium Alloy: | 105 | 0.39 | 568 | 487.5 |

Light Composite: | 140 | 0.25 | 398 | 426.6 |

Composite Laminate: | 210 | 0.19 | 455 | 487.5 |

Crystaliron: | 320 | 0.16 | 511 | 609.4 |

Super Dense: | 490 | 0.16 | 795 | 914 |

Bonded SD: | 980 | 0.08 | 1591 | 914 |

Coherent SD: | 1400 | 0.05 | 1988 | 914 |

And here's Hyper Denses stats in a more conveinate format.

**Material DR/Inch WM CM Density**

Hyper Dense: 1960 0.04 200 914

**DR/Inch**: How many points of DR provided by 1inch of the given material.

**WM**: The materials Weight Modifier. This is how much 1 point of DR covering 1 square foot weighs. To find how much you armor weighs multiply how much DR it provides by the area it covers in square feet by the materials WM.

**CM**: This is how much 1lbs of a given material costs. Multiple the armors weight by CM to find out its cost in GURPS $.

**Density**: The materials density in pounds per cubic foot.

Gotta say looking into

*was fun and I might have to give it a try one day. Might also see about converting*

**Traveller***to*

**Fire, Fusion and Steel***one of these days if I ever get myself a copy.*

**GURPS**