01-18-2011, 02:13 AM | #1 |
GURPS FAQ Keeper
Join Date: Mar 2006
Location: Kyïv, Ukraine
|
[Spaceships] Gasbag system - size modifier?
Greetings, all!
Spaceships #7 has stats for gasbags, and RPK mentioned that (for example) an SM+10 craft with appropriate-sized gasbags is the SM of folded, deflated state. So . . . what is the necessary SM adjustment for craft featuring gasbags? Thanks in advance! |
01-18-2011, 05:11 AM | #2 | |
Join Date: Dec 2009
|
Re: [Spaceships] Gasbag system - size modifier?
Quote:
But Spaceships does not adjust for volume; its SMs are determined by mass. Consider these two craft: SM: +8 Ballistic Escape Pod, 1 core Habitat, 19 Exotic Laminate Armor systems SM: +8 Park Trailer, 1 core Engineering Room, 19 Open Space systems Those should not have the same SM for targeting purposes. Now, somebody could make a list of systems and the volume they come out to under VE(which would require some extrapolation and interpolation), and you could then add up volumes and use the equation in VE to find the SM. But that's a bit too complex for Spaceships.
__________________
If you must feed the troll, take it to PMs. "If it can't be turned off, it's not a feature." - Heuer's Razor Waiting For: Vehicle Design System
|
|
01-18-2011, 06:04 AM | #3 | |
Join Date: Dec 2009
|
Re: [Spaceships] Gasbag system - size modifier?
Quote:
So, let's see… a 300T ship, as in, with the gasbag deflated, requires 600 000lb of lift in 1G. At 60cf/lb, that requires 36 000 000cf. Using the spaceship in VE as "typical" density, the volume of a 300T non-gasbag ship would be about 50 274cf. The non-gasbag portion of the ship with a gasbag is about 40 219cf. So about ×717 volume, or +6 SM by the table in VE. (+5.7 SM by the equation, which I guess I derived from the table.) The same with lifting gas is about ×180 volume, or +5/+4.5 SM.
__________________
If you must feed the troll, take it to PMs. "If it can't be turned off, it's not a feature." - Heuer's Razor Waiting For: Vehicle Design System
Last edited by Darekun; 01-18-2011 at 06:31 PM. Reason: Slept, checked my math. |
|
01-18-2011, 03:03 PM | #4 |
Join Date: Feb 2006
Location: Not in your time zone:D
|
Re: [Spaceships] Gasbag system - size modifier?
Yes, ever so slightly failed to read...
Would 300 tons @ 1 ton per cubic metre be about 11,000cf? If so, I get lifting gas +6SM and hot air +7SM? Probably wrong again. Funniest thing is, the first time I worked it out, I used the wrong scaling (read linear for volume) which gave the sort of numbers I just got... But, Wow, an increase by a factor of 1,000? And that's just for enough gas to lift the ship. And a zeppelin would be SM+11 (30ton? They had about a 9 ton cargo capacity...)
__________________
"Sanity is a bourgeois meme." Exegeek PS sorry I'm a Parthian shootist: shiftwork + out of country = not here when you are:/ It's all in the reflexes |
01-18-2011, 04:06 PM | #5 | |
Banned
Join Date: Oct 2007
Location: Europe
|
Re: [Spaceships] Gasbag system - size modifier?
Quote:
|
|
01-18-2011, 04:22 PM | #6 |
Join Date: Feb 2005
Location: Berkeley, CA
|
Re: [Spaceships] Gasbag system - size modifier?
+5 to +6 (x300-x1,000 volume); the assumed density of normal craft is on the order of 320 kg/m^3 (20 lb/cf), the density difference between a gasbag and the surrounding air is on the order of 0.5-1 kg/m^3 depending on what the gasbag is filled with, so the gasbag needs to be 320-640x the volume of the craft.
|
01-18-2011, 05:34 PM | #7 |
Join Date: Aug 2007
Location: Vermont, USA
|
Re: [Spaceships] Gasbag system - size modifier?
You could just treat them as Exposed Systems (p. SS66), targeted at the spacecraft's SM +3.
|
01-18-2011, 06:53 PM | #8 | |||
Join Date: Dec 2009
|
Re: [Spaceships] Gasbag system - size modifier?
Ish, yeah. Try Google Calculator :J
Quote:
Quote:
Quote:
Also, I suspect something like the volume-adding system would probably be needed as a stepping stone to such a system.
__________________
If you must feed the troll, take it to PMs. "If it can't be turned off, it's not a feature." - Heuer's Razor Waiting For: Vehicle Design System
|
|||
Tags |
gasbag, spaceships |
Thread Tools | |
Display Modes | |
|
|