This is a weekly posting with GURPS vehicles (and the like) to the
GURPSnet mailing list. I grant the permission for all non-commercial
redistribution of my work, but I would like to know if you put it on
a website or the like. The files at omeyer.gmxhome.de are down until
I fix the automatic PDF generation, which should be one of these
days - see sourceforge.net/projects/gurpsml
Onno Meyer, 2010-08-23
Subcarrier v1.0 (TL6)
Copyright 2010 by Onno Meyer
Historical submersible aircraft carriers never got beyond a few scout
floatplanes on large fleet submarines. The technical problems of sealed
hangars and lifts keep the Subcarrier in the realm of pulp fiction, and
the less realistic alternate history scenarios.
This Subcarrier is roughly the size of a WWII escort carrier, with a
300' flight deck and 25 to 30 aircraft. All planes must be launched or
stowed in the hangar before the Subcarrier can dive, which sets a firm
limit on the number and size of aircraft. Unlike conventional carriers,
she has islands on either side of the flight deck.
The carrier has two steam catapults, and she will turn into the wind
at 25 knots to launch fully loaded planes. The aviation fuel and bombs
last for one sharp battle, with a little left over for patrolling.
At 5 knots, the batteries last for 48 hours. The top submerged speed
of 16 knots can be maintained for a mere 105 minutes. Most likely, she
will launch a strike and then dive to evade the enemy counterstrike.
The turbines burn 1,800 gallons of diesel per hour at 21 mph routine
speed, the auxiliary generator burns another 8 gallons. A full load of
fuel, 40mm ammunition, and provisions is $336,000.
Subassemblies: Body +10, two Superstructures +7, ten full-rotation Open
Mounts +1.
Powertrain: Two 15,000-kW screw propellers; two 15,000-kW steam
turbines; 200-kW standard diesel engine; 192,000,000-kWs lead-acid
batteries.
Fuel: 540,000 gallons diesel (fire on 10).
Occ: 45 CCS (Body), 30 bridge RCS (superstructures), 180 bunks,
10 double-occupancy cabins, 5 single-occupancy cabins.
Cargo: 5,000 cf.
Armor F RL B T U
Body: 4/240 4/240 4/240 4/240 4/240
Superstructures: 4/240 4/240 4/240 4/240
Weaponry
Ten 40mm Autocannon [OM1-10:F] (625 rounds each) +0.
Equipment:
Body: Medium sonar communicator; 10-mile active/passive sonar; twelve
fire extinguisher systems; mechanic workshop; engineering workshop; two
launch catapults; operating room; 4-bunk brig; 20,000-cf hangar bay; 600
man-day limited life system; 10,000 gallons aviation gas (fire on 14).
Superstructure 1: 60' periscope with 10x telescope; 30' periscope with
50x telescope; 30' periscope with 20-mile, surface search radar; two
sets of precision navigation instruments; autopilot; two fire
extinguisher systems; 30,000 man-days of provisions. Superstructure 2:
Three very long range radios; extreme range radio with scrambler; signal
lamp; two sets of precision navigation instruments; IFF; advanced radar
detector; sensitive radio receiver with direction finder; two fire
extinguisher systems. Open Mounts: Universal mounts for 40mm cannon.
External: 10,000 sf flight deck.
Statistics
Size: 320'x80'x80' Payload: 2,000 tons Lwt.: 10,000 tons
Volume: 400,120 cf Maint.: 25 man-hours Price: $27,633,180
HT: 7. HPs: 240,000 Body, 30,000 each Superstructure 80 each Open
Mount
wSpeed: 30 wAccel: 0.5 wDecel: 0.1(0.4) wMR: 0.02 wSR: 5
Draft 25'. Flotation rating 11,250 tons.
uSpeed: 19 uAccel: 0.4 uDecel: 0.1(0.3) uMR: 0.02 uSR: 5
Submerged draft 97'. Crush depth 600 yards.
Design Notes
Body is 360,000 cf, with total compartmentalization and very fine
lines. Open mounts are 12 cf each. Superstructures are 20,000 cf each,
with total compartmentalization. Structure is extra-heavy, standard,
submersible. Armor is standard metal. Mechanical controls with duplicate
maneuver controls and duplicate diving controls. 3,421 cf of empty space
in the body, 576 cf of empty space in superstructure 1 and 52.8 cf of
empty space in superstructure 2. 6,250 rounds of 40mm SAPHE are stowed
in the superstructures. Empty weight is 16,000,000 lbs.
Weapon Weight Volume Cost Power WPS VPS CPS TL
40mm Autocannon 320 6.4 $2,600 - 2.4 0.024 $3.6 6
Weapon Ammo Malf. Type Damage SS Acc 1/2D Max RoF
40mm Autocannon SAPHE crit. cr. 6d*4(0.5) 20 13 700 3,900 8
plus exp. 3d[4d]
The vehicle uses the design rules from Vehicles [second edition, third
printing, December '09 errata], VXi and VXii (including the armor volume
rule) with the text format from Vehicles Lite.
Next Week: A fighter for the sub.
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