GURPS Spaceships for THS conversions?

[laserdog]

Now that GURPS Spaceships is out, has anyone done any conversion of classic THS ships to that system?

I'm thinking of beginning on it myself, but was hoping someone else had done a couple of them.

[thtraveller]

Originally Posted by laserdog

Now that GURPS Spaceships is out, has anyone done any conversion of classic THS ships to that system?

I'm thinking of beginning on it myself, but was hoping someone else had done a couple of them.

It was something I was planning on doing after I finish converting Traveller ships in a few weeks time.

Have you seen the JavaScript utility that someone on one of the other Gurps boards has put up: http://101010.org/gurps/ss_cost_calc.html

I tried to do a TL9 Meizi today to get a feel for it and the basic design you can do, but you can't get close to the delta-V without choosing the TL10 drive and fuel performance. How can you get close to 165 mps total delta-V (82.5 mps with turnover) with 0.06G sAccel at TL9? I chose TL10 drive and tanks as the best fit though this lowers overall delta-V.

You also have to make decisions about what to do with the small components that are way below the size of one module on an SM 10 craft - like the hangar and the laser towers.

Meizi outline design:

Front
1 Armor (Metallic Laminate)
2-6 Habitat (250 cabin equivalent plus cargo)
0 Control Room

Central
1-6 Fuel Tank

Rear
1 TL10 Fusion Pulse Drive
2-0 Fuel Tank

Option: Spin Gravity

dST/HP Hnd/SR HT Move LWt. Load SM Occ dDR M$ Cost
150 -2/5 13 0.05G/120mps 10,000 250 10 500ASV 20/0 217

[David L Pulver]

THS is TL10, but some ships may use TL9 drives.

[thtraveller]

Originally Posted by David L Pulver

THS is TL10, but some ships may use TL9 drives.

Oh, I thought it was late TL9 with TL10 Biotech (p140). Is this a G:Spaceships specific suggestion?

[Phil Masters]

Originally Posted by thtraveller

Oh, I thought it was late TL9 with TL10 Biotech (p140).

That's Third Edition, ferrpeedzaik. The 4e Tech Levels are redefined almost explicitly to make TS technology fit better. (It's TL10 with some early/experimental TL11 stuff, in fact.)

[dscheidt]

I did a few conversions early during the playtest. Tings match reasonably well, but lots of things fall below the resolution of the Spaceships rules.

[thtraveller]

Originally Posted by Phil Masters

That's Third Edition, ferrpeedzaik.

You mean Classic TS ;-)

The 4e Tech Levels are redefined almost explicitly to make TS technology fit better. (It's TL10 with some early/experimental TL11 stuff, in fact.)

Grumble. I have to read Changing Times as well as buy it? Grumble.

Hmm, I must have read that bit last xmas. It obviously didn't sink in - mind you it was the season to make merry :-)

Originally Posted by dscheidt

I did a few conversions early during the playtest. Tings match reasonably well, but lots of things fall below the resolution of the Spaceships rules.

What were the suggestions for those things? Like laser towers and hangars?

I can think of a few options
- Just ignore them?
- Include them in the accommodation section?
- Install a tertiary battery with only 2 weapons and lots of cargo?
- Install a hangar and lots of cargo?
- use split modules?

[laserdog]

Originally Posted by David L Pulver

THS is TL10, but some ships may use TL9 drives.

I've gotten stuck on exactly which of the fusion reaction drives best represent the He3 powered engines.

My guess was "Fusion Rockets" for the space-only designs.

But have been at a loss for what to use to get out of a gravity well.

[Crakkerjakk]

Here's the conversion for the laser launch system

Originally posted by Boobis, and figures checked by me. Aside from that, the non-laser launch vehicles for earth are going to be multi-stage or metallic hydrogen chemical rockets, as I understand it.

[David L Pulver]

Originally Posted by laserdog

I've gotten stuck on exactly which of the fusion reaction drives best represent the He3 powered engines.

My guess was "Fusion Rockets" for the space-only designs.

But have been at a loss for what to use to get out of a gravity well.

Ships that use "Fusion Torch" in THS are best repped by TL9 fusion rockets, sometimes with high-thrust. In Fact, the TL9 fusion rocket with/without high thrust is an almost exact match.

Many ships in THS use "Fusion Pulse" and these are probably best repped by the TL10 fusion pulse drives.

Fairly slow ion drive, magsail (plasma sail) and fusion engine vessels, if they operate in low orbit at all (as opposed to from L5 or GEO ports) will often rely on tugs with NTR rockets (fission drive).