08-19-2011, 06:44 PM | #21 |
Join Date: Oct 2006
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Re: Pyramid #3/34: Alternate GURPS
I think I've noticed a bit of a problem with the vehicle design rules in Pyramid 34. I've been trying to design a submarine that has a comparable performance to a U-Boat. So I looked up a U-Boat in my copy of GURPS WWII : Motor Pool and I found a crush depth of 330 yards. Using the formula provided for crush depth, I can't get anywhere close to 330 yards without using force fields! Using the formula of dDR * 150 / (hull length in feet) = Crush Depth, I can't begin to approach 330 yards, or any reasonable crush depth at all. I'm not sure what the mistake is, but I'm pretty sure there is one. Can someone who knows more about this crunchy stuff help me?
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08-19-2011, 07:03 PM | #22 |
Join Date: Oct 2007
Location: Kentucky, USA
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Re: Pyramid #3/34: Alternate GURPS
If you assume the sub has enough armor systems to have -1 SM (at least 12) then it increases the armor value per system by 1 step and gives that nice modifier to dDR. Try playing around with that, I don't have my spaceship books handy to look up the numbers too see if it gets you there or not.
Edit: also, try using only the pressure hull for the Length value, instead of the entire sub. |
08-19-2011, 07:12 PM | #23 | |
Join Date: Oct 2006
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Re: Pyramid #3/34: Alternate GURPS
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EDIT: I made a mistake. I end up with a crush depth of 36 yards. Still only 10% of my goal, and my ship is over half armor. Last edited by wabishtar; 08-19-2011 at 07:25 PM. |
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08-19-2011, 07:30 PM | #24 | |
Join Date: Oct 2007
Location: Kentucky, USA
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Re: Pyramid #3/34: Alternate GURPS
Quote:
For a crush depth of 20 yards, we need. 20*165/150 = 22 dDR. If it is 12 armor systems, then each one needs to be 22/(12*1.8)= 1dDR That's the dDR of wood, if I remember right. |
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08-19-2011, 07:39 PM | #25 | |
Join Date: Oct 2006
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Re: Pyramid #3/34: Alternate GURPS
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08-19-2011, 08:17 PM | #26 | |
Join Date: Oct 2007
Location: Kentucky, USA
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Re: Pyramid #3/34: Alternate GURPS
Quote:
Anyway, my logic is this, the craft is SM 8, and has SM -1 from armor, so we use SM 9 parts. Using TL 7 steel, we have dDR 5 per system, total dDR 60 * 1.8 = 108, so we get a crush depth of (108 * 150) / 165 = 98 yards, not yet at 330, but getting closer. Actually, if we change length from feet to yards, it works out to 306 yard crush depth. Pretty close. Edit: and if we have 18 armor systems (-2 SM), we can have a sub of 18 SM +10 systems and 9 SM +8 systems, and a crush depth of 412 yards! Fun fun. Last edited by Tyneras; 08-19-2011 at 08:25 PM. |
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08-19-2011, 08:34 PM | #27 | |
Join Date: Oct 2006
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Re: Pyramid #3/34: Alternate GURPS
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08-19-2011, 08:42 PM | #28 |
Join Date: Nov 2009
Location: Oregon
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Re: Pyramid #3/34: Alternate GURPS
Bought it, love it. The "Spaceships as VDS Lite" is pretty cool. I know there are some existing SS design spreadsheets floating in the digital ether. Anyone planning to add in the new Ground/Water/Air options and systems?
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08-19-2011, 09:33 PM | #29 | |
Join Date: Nov 2004
Location: Flushing, Michigan
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Re: Pyramid #3/34: Alternate GURPS
Quote:
Also, it's really hard to find weight values for most insects. (Honestly, don't these biologists know there are game designers who need this information?) I did find out that a black widow spider weighs just shy of one gram, giving her a ST of 0.2. I guesstimated that a honeybee would be ST 0.1 and a dragonfly would be ST 0.3. |
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08-19-2011, 10:02 PM | #30 |
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Join Date: Sep 2004
Location: Southeast NC
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Re: Pyramid #3/34: Alternate GURPS
The formula for crush depth appears to be off by a factor of 10, and L should be in yards rather than feet.
Edit: An opinion. Unofficial. Not associated with any of the creators.
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RyanW - Actually one normal sized guy in three tiny trenchcoats. Last edited by RyanW; 08-20-2011 at 07:16 PM. |
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