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Old 10-31-2010, 11:16 AM   #1
Ethics Gradient
 
Join Date: Feb 2008
Default Spaceships - Smaller systems

According to the rules in place of a normal sized system I can take 3 one SM smaller systems. Or 9 two SM smaller system, and so on. Which is great because I need more than 20 systems for my ship.

But here's my problem: my ship is SM+7 and each habitat (price 300k) gives me 2 cabins of space. If I instead take 3 SM+6 habitats (each 100k with one cabin) I get 3 cabins of space! This works for larger ships too - a SM+8 habitat gives 6 cabins, but 9 SM+6 habitats give 9 cabins. And all for the same cost.

Is this legal? Some of the ships in Spaceships 8 are using smaller habitats. What am I missing?
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Old 10-31-2010, 11:21 AM   #2
Langy
 
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Default Re: Spaceships - Smaller systems

SM+6 habitats shouldn't really be rules-legal. A single cabin, on every other ship size, is 7.5 tons. On SM+6 ships, it's 5 tons.

Also, if you use a 2-SM smaller system it provides 10 extra systems, not 9, since the progression is 1-3-10-30, not 1-3-9-27.
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Old 10-31-2010, 11:56 AM   #3
Ulzgoroth
 
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Default Re: Spaceships - Smaller systems

The rounding in spaceships has painful results all over the place.
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Old 10-31-2010, 12:07 PM   #4
munin
 
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Default Re: Spaceships - Smaller systems

There are other places where smaller systems produce some weird results due to GURPS Spaceships progressions. If following a rule leads to nonsense results, adjust the rule. Here are some adjustments I like:

For Habitats I would say that spacecraft of SM+7 or higher require 7.5 tons per cabin -- so you can't have an SM+6 Habitat, but you can have a half-size habitat (one cabin occupying half an SM+7 system).

For Open Spaces, a smaller Open Space has 1/3 the areas of a standard-sized system (round down).

SM+10 spacecraft have an additional workspace for every three smaller systems which would require workspaces if standard size (round up).


I also say that smaller Weapons cost 1/3 as much as a standard-sized Weapon system, but that's just because I don't like the cost progression of Weapon systems.
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Old 10-31-2010, 01:00 PM   #5
Ethics Gradient
 
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Default Re: Spaceships - Smaller systems

Quote:
Originally Posted by munin View Post
For Habitats I would say that spacecraft of SM+7 or higher require 7.5 tons per cabin -- so you can't have an SM+6 Habitat, but you can have a half-size habitat (one cabin occupying half an SM+7 system).
Sounds good. Shame really, I could have used that extra cabin in a central radiation shielded location.

BTW, can I have a half-size engine with one half acceleration? There are half-size fuel tanks, but no half-size engines are mentioned.
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Old 10-31-2010, 01:07 PM   #6
munin
 
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Default Re: Spaceships - Smaller systems

Quote:
Originally Posted by Ethics Gradient View Post
BTW, can I have a half-size engine with one half acceleration? There are half-size fuel tanks, but no half-size engines are mentioned.
I don't see why not. I've used one in a build.
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Old 10-31-2010, 01:07 PM   #7
RyanW
 
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Default Re: Spaceships - Smaller systems

Quote:
Originally Posted by Ethics Gradient View Post
Sounds good. Shame really, I could have used that extra cabin in a central radiation shielded location.

BTW, can I have a half-size engine with one half acceleration? There are half-size fuel tanks, but no half-size engines are mentioned.
Don't see a reason not to allow it.
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Old 10-31-2010, 03:21 PM   #8
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Default Re: Spaceships - Smaller systems

Quote:
Originally Posted by Ethics Gradient View Post
Is this legal? Some of the ships in Spaceships 8 are using smaller habitats. What am I missing?
Spaceships 8, pg5, only mentions -1SM and as for Habitats, they're not even that - they're in the half-size system list.

Not saying I haven't bent those guidelines myself but, if you bend things, they do tend to break.
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Old 10-31-2010, 05:55 PM   #9
Ethics Gradient
 
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Default Re: Spaceships - Smaller systems

Quote:
Originally Posted by jacobmuller View Post
Spaceships 8, pg5, only mentions -1SM and as for Habitats, they're not even that - they're in the half-size system list.

Not saying I haven't bent those guidelines myself but, if you bend things, they do tend to break.
Several designs in Spaceships 8 use a -1 SM habitat. I think it would be simplest to just say that a SM+6 habitat can't be used as a smaller system. Larger habitats can be used as a smaller system as their number of cabins follows the 1-3-10 progression.
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Old 11-01-2010, 12:58 AM   #10
MatthewVilter
 
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Default Re: Spaceships - Smaller systems

Quote:
Originally Posted by Langy View Post
...if you use a 2-SM smaller system it provides 10 extra systems, not 9, since the progression is 1-3-10-30, not 1-3-9-27.
This sounds right to me... I don't need rules to back up this common sense call, but if it is written down somewhere can someone point me to it?
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