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MegaTraveller Discuss of the MegaTraveller ruleset and the Rebellion Milieu

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Old August 13th, 2019, 10:19 AM
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Default A MegaTraveller Starship Design Example edited by Don McKinney

Morning again from the Pacific Northwest,

The Travellers's Digest Number 13 1988 included the article A MegaTraveller Starship Example by Joe D. Fugate Sr., which was edited by Donald McKinney who made the document available on his web site. Donald updated the article with material from the Travellers' Digest Number 21 Traveller Q&A pages and additional errata not available in 1988. Joe D. Fugate Sr. answered a question with the designer pointer of not installing Basic Life Support and Extended Life Support in the fuel tanks.

From Donald's article:

1. A jump 4 drive requires 253,125 kl of fuel

2. Using the Regal's corrected volume of 1,012,500 kl the calculated Basic and Extended Life Support requirements are:

Basic Life Support: Power = -1,012.5 MW; Volume = -5,062.5 kl; Weight = 5,062.5 tons; Cost = Cr303,750,000

Extended Life Support: Power = -2,020 MW; Volume = -3,030 kl; Weight = 3,037.5 tons; Cost = Cr202,500,000. My calculations have the volume as -3,037.5 kl.

3. The design note is for not installing basic and extended life support in the fuel tanks. From the article in red text "Let's look at what happens when we remove the life support from the Jump fuel space:" which was calculated as 253,125 kl.

The new requirements are:

Basic Life Support: Power = -672.08 MW; Volume = -3,360.40 kl; Weight = 3,360.40 tons; Cost = Cr201,624,120

Extended Life Support: Power = -1,344.16 MW; Volume = -2,016.24 kl; Weight = 2,016.24 tons; Cost = Cr134,416,080.

My recalculations began as follows:

1,012,500 kl - 253,125 kl = 759,375 kl.

Basic Life Support Power = 0.001 x 759,375 = 759.3750 kl which is not a match.

Extended Life Support Power = 0.002 x 759,375 = 1,518.750 kl which is again not a match.

Taking the article's basic life support power input requirement of 672.08 MW and dividing by 0.001 results in a hull volume of 672,080 kl.

Taking the article's extended life support power input requirement of 1,344.16 MW and dividing by 0.002 results in a hull volume of 672,080 kl. (Changed the incorrect value of 0.001 to 0.002)

Checking to see the fuel tankage used I subtracted the total hull volume from the volume of 672,080 of the basic and extended life support requirements. The calculation returns the fuel tankage as being 1,012,500 - 672,080 = 340,420 kl. This is not the jump fuel tankage, however this is the power plant fuel requirement as determined in THE FUEL AND MISCELLANEOUS SECTION.

I hope that my calculation using the real Jump fuel tankage is correct and if I did the process correctly the calculations in the Environment Controls step is probably errata.

Was my approach of subtracting the jump fuel tankage from the total hull volume correct?

If I'm on the right track would this be errata?
Tom Rux

Last edited by robject; August 14th, 2019 at 04:12 PM.. Reason: Used incorrect value for Extended Life Support
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