Evening PDT Jeff Zeitlin,
CT Book 2 Starships 2e p. 15 provides the following:
At a minimum, ship fuel tankage must equal 0.1MJn + 10Pn, where M is the tonnage of the ship, Jn is the ship's jump number, and Pn is the ship's power plant rating. Power Plant fuel under the formula (10Pn) allows routine operations and maneuver for four weeks. Jump fuel under the formula (0.1MJn) allows one jump of the stated level. Ships performing jumps less than their maximum capacity consume fuel at a lower level based on the jump number used.
The 400 d-ton Subsidized Merchant per CT Supplement 7 copyright 1980 8th printing p. 21 has a performance of 1G acceleration, Jump-1, and a standard power plant. Per CT Book 2 Starships 2e the power plant must be the same rating as the drive with the greatest rating. Based on the information the Subsidized Merchant has a Power Plant rating of 1.
The J1 Drive requires 0.1 x 400 x 1 = 40 d-tons of fuel.
The Power Plant which provides power to the M Drive requires 10 x 1 = 10 tons of fuel and allows continuous operation for 4 weeks.
The 400 d-ton Subsidized Merchant requires fuel tankage of 40 d-tons of jump fuel + 10 d-tons of power plant/maneuver drive fuel for 4 weeks of operation = 50 d-tons, 4-weeks of operation.
To allow the J1 drive make 3 jumps without refueling requires the jump fuel tankage to be increased from 40 to 40 x 3 = 120 d-tons. There has been no change to the Power Plant fuel tankage of 10 d-tons.
The 400 d-ton Subsidized Merchant new tankage requirement would be 120 d-tons Jump fuel + 10 d-tons power plant/maneuver drive fuel = 130 d-tons, 4-weeks of operation.
From CT Book 2 Starships 1e p. 9 "A power plant, to provide power for one trip (internal power, maneuver drive power, and other necessities) requires fuel in accordance with the formula: 10Pn.
Tom Rux
From: "Jeff Zeitlin" <xxxxxx@freelancetraveller.com>
To: "The Traveller Mailing List" <xxxxxx@simplelists.com>
Sent: Sunday, July 2, 2017 5:35:22 PM
Subject: [TML] SHIPBUILDING: Maneuver Drive/Power Plant fuel?
This question applies to Classic Traveller (Books 1-3) designs.
I've been running the numbers for confirmation on some ship designs
that have been submitted, and I'm a bit confused all of a sudden. If I
look at the example ships from Book 2, the fuel tankage quoted seems
to be exactly what's needed for the specified Jump capability, but is
cited as "supports _n_ Jump _m_ and four weeks of operation". Is four
weeks of Power Plant/Maneuver fuel included in the allocation for the
Power Plant? If so, how do I determine how much fuel to add if I'm
designing the ship for extended-duration operations? If Power Plant
fuel is considered to be part of the cited fuel allocation, then how
can a 400td hull with J1 capability support 3xJ1 plus 4 weeks on 120td
of fuel?
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