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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.


Delta Vee

What is Delta Vee? It is the technical term for change in velocity, often used in rocket equations to denote the maximum velocity the rocket can obtain from a standing start. It is also the name I gave to a space wargame I first wrote back in 1995 or so, before I started using Full Thrust. I've recently decided to start reworking the Delta Vee rules and make them public.

Design Goals

The primary design goals for Delta Vee are to provide a scalable, simple, hard sf framework for modelling space combat.


It should be able to scale from small fighters up to craft such as the Lexx or Sleeper Service. By scale, I mean that the same battle should be able to cope with small craft fighting big craft, rather than using an undefined size that can be set for different genre.


Reasonably simple and fast. Warhammer/FT style of throws lots of dice rather than looking up charts and using hit locations (e.g. B5 Wars).

Hard SF

Must use vectors for movement and reaction drives, so keeping track of reaction mass is very important (hence the name of the game). Must still be simple though, but how to do this was all worked out 10 years ago, so I can use the old rules.

Basic Rules

deltavee/deltavee.txt · Last modified: 2015/02/04 22:40 (external edit)