(OOC: Apologies if I've stuffed things up - thank FreeTrav yet again for
suggesting I post..  I'm asking for classic-era GT designs, so that's
GURPS 3rd ed )

WOMBAT LIC is seeking designs from interested parties for a tanker fleet
to supply fuel to a deep space station 2 pc out (designed, built and
maintained by our sister corporation, WOFTAM LIC) from the nearest
system, where said fleet will be based.

Tanker physical specifications:
Unrefuelled out and back capacity at J2
One full jump's fuel carried in internal tankage
Second jump's fuel stored at designer's discretion - for example. may be
additional internal tankage, drop tanks, cheeseburgers, etc
Minimum boost of 0.7G when fully laden
Constructed and supported at GTL10 - higher GTL components are not
necessarily verboten, but their elevated costs (1.5x for GTL11, 3x for
GTL12) must be clearly accounted for.  GTL13 components (at 6x sticker)
are not expected to offer sufficient performance advantage to justify
their hassle and expense - designs containing such will require an
exceptional case to support them
Frame and materials are at designer's discretion, subject to being able
to obtain insurance coverage
Minimum DR 200 expensive metal armour
Displacement to be at least one of 5, 10, 20 or 40 kdton - submissions
covering multiple tonnages are encouraged
If fuel is to be refined aboard, sufficient refining capacity to refine
all fuel initially onloaded in 150 hours or less
Crew double-bunk (except if there is an odd stateroom, then the skipper
single-bunks), and crew requirements are per TAS requirements (out of
game, per GT: Starships, "Crews on Large Ships" pp25-26)

Tanker operational assumptions:
23 round trips (out + back) per annum, corresponding to approximately
~90% lifetime availability.  Return trips will be unavoidably empty.
Physical service life of 100 years, with keel-up rebuild at 50 years in
service, and disposal for essentially zero scrap value at 100 years.
1.05x capital cost amortised over 100 years at 5% pa - corresponds to
annual "mortgage" payment of 5.30% of upfront capital cost. (100% of
sticker price up front to build tanker, and 50% of sticker price after
50 years to pay for rebuild)
3% of tanker's maximum displacement (2% for annual maintenance, 1% for
(re)build) at MCr0.3/dton (starshipyard capacity) to be carried and
amortised at 5.05% of that upfront cost per annum (no need to give the
starshipyard a keel-up rebuild).
Due to the overwhelming and unrelenting excitement of crewing a tanker
shuttling along a fixed route, each crew position will be paid at
KCr2/month and rotated between each of two crews, for a yearly cost of
KCr48 per crew position aboard.  Each such crew will work on a "one trip
up, one trip down" basis and may not necessarily crew the same tanker on
successive trips.
Onloaded fuel is charged at Cr50/dton (for unrefined fuel refined
aboard) or Cr350/dton (for refined fuel), whether burned by tanker or
delivered to deep space.  Other raw materials will have to be priced on
case by case basis.
Berthing fees are NOT payable
Annual maintenance of 0.1% of vessel's upfront capital cost must still
be paid.

Fleet-level requirements and assumptions:
Must deliver 41.6 Mdton refined fuel per annum to deep space
Ceteris paribus, designs delivering that requirement at a lower
delivered cost per dton will be favoured
Tanker fleet will be built in-house at WOMBAT's starshipyard