09-26-2012, 09:17 AM | #1 |
Join Date: Jun 2011
Location: Richmond, VA
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How tough is ice?
I am building a super that has the create ice power. My concept is that she can create walls of ice, hollow spheres of ice, and maybe even an ice bridge or a raft.
So it brings up the question. How much HP and DR does ice have per inch of thickness? |
09-26-2012, 10:42 AM | #2 |
Join Date: May 2005
Location: Lynn, MA
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Re: How tough is ice?
I don't think I've seen it in a 4th Ed book. In GURPS Supers 3rd Ed however, it's on the sidebar of page 85.
DR 3 / inch for the first foot, DR 4 / inch for the second foot, DR 5 / inch for the third, etc until it caps out at DR 20 / Inch. "When a wall of ice takes damage, 2/3 of the the damage (round up), is applied to reducing the DR of the remainder (in that spot). the rest reduces hit points" It also mentions the useful... A square foot of ice 1 inch thick weighs 4.8 lbs, and a gallon of water weighs 8.3 lbs. |
09-26-2012, 12:09 PM | #3 | |
Join Date: Jul 2006
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Re: How tough is ice?
Quote:
One imperial gallon weighs ten pounds. That makes sense, 160 fluids onces weigh 160 ounces avoirdupois. So how does one US gallon at (128 fluid ounces) come out to 8.3 pounds? |
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09-26-2012, 12:28 PM | #4 | |
Join Date: Sep 2004
Location: Canada
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Re: How tough is ice?
Quote:
the United States (liquid) gallon (≈ 3.79 L) = 3.79kg of water = 8.35552 pounds. It certainly seems to come out at 8.3 pounds. I think your problem is assuming the fluid ounces are the same unit. They're not the same size.
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09-26-2012, 12:43 PM | #5 |
Join Date: Jul 2006
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Re: How tough is ice?
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09-26-2012, 12:59 PM | #6 |
Join Date: Sep 2004
Location: Canada
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Re: How tough is ice?
Oh, that's not something special to the US measurement system. And in this case it's actually the UK you should blame - they decided to change the size of their ounce one day, not the US. But the current situation (Three different legacy systems sharing the same or similar unit names - don't forget Troy weights :P) is much better than it used to be. Each country used to have its own standard.
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09-26-2012, 01:01 PM | #7 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: How tough is ice?
Spaceships has statistics for ice armor; per module it has 1/5 the DR of steel armor, but that's really per unit weight, and ice is around 1/10 the density of steel, so it works out to DR 1-2 per inch. Some very old references about pyrkete claims 36 cm penetration for a 7.69mm (unclear exactly what bullet this is); if we assume that's a 7d rifle, it works out to DR 0.68 per mm or 1.73 per inch.
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09-26-2012, 01:06 PM | #8 | |
Join Date: Mar 2012
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Re: How tough is ice?
Quote:
Of course, if you mean the perversity of the US still not using metric... then I quite agree with you. |
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09-26-2012, 01:49 PM | #10 |
Join Date: Jul 2007
Location: Ann Arbor, MI
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Re: How tough is ice?
Also known as the personal canon. It's physically painful to shoot one in an enclosed shooting box, and you can always tell when somebody has them at the range. Don't notice the noise when I'm shooting it, but I was at another part of the range one day and somebody was shooting one. About the loudest thing I'd heard out there, and I was on the skeet range at the time.
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