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Fritz_Brown March 12th, 2013 07:14 AM


Originally Posted by Icosahedron (Post 425750)
Disadvantage: Too many Pop9 TL2 Asteroids. Especially when automation makes tweaking difficult...

Amen to that. In my LBB6 spreadsheet, I have all the raw rolls available in hidden columns, and go move rolls around to "fix" that. Yes, a lot of work.

rich4421972 March 15th, 2013 12:32 AM

My vote is for TNE. It has all of the star/ planet and orbital locations of GURPS and yet is relatively simple and easy to use. I also like the star classification system which is still fairly accurate t what we know about stellar types and their approximate presence.

aramis March 15th, 2013 02:07 AM

I voted WBH and other. For insane cultural details, nothing yet beats WBH (or its progenitors, Grand Survey and Grand Census). For system gen, my homebrew redevelopment for MgT into an extended gen ala bk 6.

SpaceBadger May 16th, 2013 09:43 PM

Cautionary note on WBH: I recently found my copy and got into a major snit over what I saw as errors in many of the size-related details (pp. 60-63), where they had obviously confused radius with diameter - until I read more closely and saw that the variable R in many of the calculations was for the planetary size digit from UPP, which approximates planetary diameter in 1000s of miles. Why they called this variable R (suggesting radius) rather than D (suggesting diameter) remains a mystery :oo: , but if you follow those directions the calculations do work out correctly.

aramis May 17th, 2013 03:29 AM

2300 used the titus-bode relationship, McPerth. it just didn't use mercury and venus for all systems' initial a and b distances.

less broken, that way.

I find T20 plus MT WBH to be awesome for color details.

GURPS Space is more realistic, but realism ceased being my goal about 2008.

McPerth May 17th, 2013 08:53 AM


Originally Posted by aramis (Post 434613)
2300 used the titus-bode relationship, McPerth. it just didn't use mercury and venus for all systems' initial a and b distances.

IIRC, Titus-Bode law gives orbital relation as O1+(O2-O1)n-1, where O1 means first orbit, O2 second orbit and n means orbital number, so giving you a geometric relation among orbits.

2300 multiplies the former orbit by 1.3 to 2.1, but a different multiplier could be for any orbit. IMHO those are not the same numbers.

As an example, in Titus-Bode law, by knowing the first and second orbits, you may estimate the 8th orbit with little margin of error, in 2300 you could not, as the variation may quite extensive. (form O1*1.37, so O1*6.27 to O1*2.17, so O1*180 in extreme cases).

Thanos May 17th, 2013 09:57 AM

So If I were to pick up one of these books, what should I get? Something that's easily compatible with mongoose.

BytePro May 17th, 2013 11:24 AM

CT Scouts (LBB6) system gen is very compatible. Most that don't change the meaning of the UWP should be good as far as avoiding conversion issues.

MgT (Mongoose) Scouts had some system stuff in it, IIRC, that might have some compatibility issues, but that should be minor.

Note these books generally cover more than just system building - they include rules for playing in the system which would not be directly compatible with MgT. But spec-ing the system with anything compatible with LBB6 should work decently with MgT.

(LBB6 is available from FFE in the collection CDs (maybe reprints still), and probably from DriveThru individually...)

MichaelSTee May 18th, 2013 11:14 AM

WBH has a lot of extra details that can be useful. GURPS Space (4th ed.) is the most realistic system I've ever seen, but does include shortcuts (still realistic, but with less math). But for Traveller-based systems, Aramis' system is the best amalgamation of rulesets I've seen.

To replace Titius-Bode, I'm thinking of using a log scale to determine approx orbit. Actual orbit can be up to 25% plus/minus.
|orbit|AU|Sol system equivalent
| 1|0.1 |
| 2|0.18 |
| 3|0.32 |mercury 0.39
| 4|0.56 |venus 0.72
| 5|1 |earth 1
| 6|1.8 |mars 1.5
| 7|3.2 |belt 2.7
| 8|5.6 |jupiter 5.2
| 9|10 |saturn 9.5
|10|18 |uranus 19
|11|32 |neptune 30
|12|56 |pluto 30-39 - kuiper belt
|13|100 |
|14|180 |
|15|320 |
|16|560 |
|17|1000 |

the.barwickian May 18th, 2013 12:22 PM

This was quite a tough one. I went for GURPS Space (having the 4th edition in mind) as it's the most up-to-date and is very detailed. For some reason I love detail in world building, even if it means I build fewer worlds.

Having said that, for all its supposed faults, the DGP World Builders' Handbook is a superb balance between detail and usability, and I often refer to it for the social details.

And First In is pretty good, too.

If I really go all out, I suppose I use a blend of all three, seasoned with a dash of Stephen Gillett's World-building for inspiration.

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