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Old May 12th, 2019, 02:55 AM
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Default Cepheus SRD Errata

As another thread brought this up, but I am not sure if the poster is looking at the original System Reference Document or the Light Version put out by Stellagama Publishing, I will start a thread covering the System Reference Document.

On page 120, under Displacement Tons, the following statement is made.

Quote:
A metric ton of hydrogen measures approximately 13.5 cubic meters, which is rounded to 14 cubic meters for ease of calculations. When drawing floor plans or maps of ships, each square measuring 1.5 meters by 1.5 meters, to a height of 3m up from the floor, represents half a ton.
A metric ton of Liquid Hydrogen occupies a volume of 14.11 cubic meters or 498.44 cubic feet, which for ease in calculations is rounded to 14 cubic meters. As the floor plans are based on a 1.5 by 1.5 meter square, and assume a height to the next deck of 3 meters, 2 of the 1.5 meter squares equal 13.5 cubic meters, which for convenience is regarded as equal to a dTon.

I view the 498.44 cubic feet as useful as it is almost exactly 5 gross register tons, or 500 cubic feet, a very common measurement of volume in Real World nautical ships. It makes calculating the amount of cargo that can be loaded in a displacement ton or dTon much easier from the standard stowage factors.

Side Note: As 1.5 meters is equal to a fraction over 59 inches, it does make going from English Measurement Base Data to metric much easier. I simply round to 5 feet or 60 inches.
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Old May 12th, 2019, 01:30 PM
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Not errata
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Old May 12th, 2019, 03:51 PM
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Quote:
Originally Posted by middenface View Post
Not errata
Call it a correction then.
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Old May 12th, 2019, 04:02 PM
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Quote:
Originally Posted by middenface View Post
Not errata
How is it not? Timerover51 demonstrated that the quoted passage has the numbers wrong, backwards even. It might be corrected as, "One metric ton of Liquid Hydrogen occupies a volume of 14.11 cubic meters, rounded to 14 cubic meters for ease in calculations. This volume is further simplified to 13.5 cubic meters per dTon in ship deckplans, to allow for two 1.5 meter squares per dTon, with 3 meters from each floor of one deck to the floor of the next."
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Old May 12th, 2019, 04:11 PM
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I agree with timerover51 and SpaceBadger.

This is a DGPism that should have been excised many editions ago, and yet it still pops up in T5 unfortunately.

The 13.5m^3 dt is based off the dimensions of the deckplan mapping squares, whereas since CT times the displacement ton is defined as the volume of one thousand kilograms of liquid hydrogen, which is approximately 14m^3 or 500 cubic feet.

Considering deckplans are allowed a bit of leeway keeping the 14.11m^3 dt actually gives you the wiggle room.
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Old May 13th, 2019, 11:15 AM
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Quote:
Originally Posted by SpaceBadger View Post
How is it not? Timerover51 demonstrated that the quoted passage has the numbers wrong, backwards even. It might be corrected as, "One metric ton of Liquid Hydrogen occupies a volume of 14.11 cubic meters, rounded to 14 cubic meters for ease in calculations. This volume is further simplified to 13.5 cubic meters per dTon in ship deckplans, to allow for two 1.5 meter squares per dTon, with 3 meters from each floor of one deck to the floor of the next."
But that results in *exactly the same result*. The end result is the same. What you get out at the end is the same. I'm not sure why there is an argument there? Timerover, have you built any vehicles yet, that aren't ships? What did you think of them? Try not to focus on real world designs, no design system so far has achieved creating a perfect 1:1 match for real world designs.
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Old May 13th, 2019, 12:45 PM
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The argument is over this statement "A metric ton of hydrogen measures approximately 13.5 cubic meters" which is factually incorrect.
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Old May 13th, 2019, 01:48 PM
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http://wiki.travellerrpg.com/Deck_Plan
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Old May 13th, 2019, 02:05 PM
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That just reinforces the definition "A metric ton of hydrogen measures approximately 13.5 cubic meters" as being incorrect, since a metric ton of liquid hydrogen is approximately 14 cubic metres.

Read what it says:
"The creation of starship deck plans is based on the assumption that one ton of mass displacement equals fourteen cubic meters" not approximately 13.5 cubic metres.
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Old May 13th, 2019, 02:38 PM
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It lies within a ten percent variance.

You could think of deckplans as being a representation of an approximation of the actual layout, with gridlines allowing the less artistically gifted amongst us to sketch out our preferred habitats.
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