Designed by AltusMare Watercraft Inc., the builders of the Hermes submarine, the S-900 is more than an enlarged version of that vessel. It is faster and longer ranged with better sensors and non-combat equipment. While it costs three times as much it is more than three times as effective. The pop-up turrets have been retained, as they have some value against aircraft and light watercraft (eg, those that cost less than a torpedo). However, the S-900 is designed more for open-sea operations and it would be rare for the boats to need the turrets, unlike the Hermes which is as much a patrol boat as it is a submarine.
The captain has a cabin to himself and the two most senior officers share a cabin. All other crewmen have single bunks. Like the Hermes the S-900 is capable of delivering special forces troops (8 in this case) using two Lemures minisubs (or other watercraft). A small workshop has been added and provisions for up to 84 days are provided. Each torpedo tube is fed from a three-round magazine; two tubes are often dedicated to carrying the SeaScorpion missile (or equivalent), depending on the local situation. If the boat is on a minelaying operation, they are carried in the drydock and released from there.
A note about the name; 'S' stands for submarine and '900' for it's approximate displacement tonnage. The Hermes was retroactively renamed the S-225, but it's original name is far more common.
Note: A stealthier version is also available; increase stealth, sound baffling and IR cloaking to radical, add M$25 to the submarine's cost and add 9 tons to loaded weight. Crush depth uses suggested errata in GURPS® Atlantis™. The advanced submarine hull is also in GURPS Atlantis.
Subassemblies: Body +8, two full rotation Turrets +2
P&P: 11000 kW turbo ceramic w/2x5250 kW hydrojets, 132,000
kW-hours rechargable power cells
Fuel: 8316 gallons diesel (fire chance: 7) in eight 1039.5 gallon
self-sealing tanks, range 3965 miles (submerged) or 2500 miles (surfaced)
at 60% top speed; 168 hours diesel, 12 hours power cells
Occ: 20 NCS (captain, 3 helmsman, 2 navigator, 3 sensor/comm
operator, 4 gunners, 1 service, 6 engineers/technicians)
Cargo: 300 cf plus 1200 cf dry dock
| Armor | F | R/L | B | T | U |
| Body | 4/675 C | 4/675 C | 4/675 C | 4/675 C | 4/675 C |
| Turrets | 4/300 C | 4/300 C | 4/300 C | 4/300 C | 0/0 |
Weaponry
4.5" missile launcher [Tur1:F] (20 HEDP + like number as cargo)
30mmC chaingun [Tur2:F] (700 APDS, 700 HEPF + like number as cargo)
8 * 324mm torpedo tubes [Body:F] (typical load: 18 torpedos and 6 SeaScorpion
missiles)
Equipment
All Turrets: 5 mile laser rangefinder, 10 mile thermograph (Scan
17), HUDWAC, full stabilization (turret #2 also has a universal mount)
Hull: hardened microframe, hardened miniframe, 3 dedicated hardened
small computers (damage control, computer navigation, C2 targeting), 15
terminals, 2 IFF, military GPS, precision navigation instruments, 2 inertial
navigation system, 2 scrambled long range radios, scrambled VLF radio,
communications buoy, 10 message buoys, 120 mile AESA (Scan 23 in search
radar mode), 100 mile thermograph (Scan 23), 30' sensor periscope (AESA/thermograph),
60 mile active/passive sonar (Scan 21 active, Scan 23 passive), 60 mile
towed sonar (Scan 21), 120 mile MAD (Scan 23), 2 advanced laser/radar detectors,
8 chaff discharger w/16 reloads, 8 blackout gas discharger w/16 reloads,
10 sonar decoy dischargers w/20 reloads, full fire suppression, 1680 man/days
rations (60 days for 28 men, 84 days for 20 men), 2 cabins, 18 bunks, 28
man/days limited life system, 28 man full life system, two-man airlock,
2 ESU, complete mini-workshop
Statistics
| Size: 18'x22'x115' | Payload: approx. 375,000 lbs | Lwt: 1,816,829 lbs (908.4 tons) |
| Volume: 32000 cf (Size Mod: +8) | Maint.: 4.2 hours | Price: $22,900,000 |
HT: 9
HP: 36,286
| wSpeed: 25 | wAccel: 2 | wDecel: 2 | wMR: 0.1 | wSR: 5 | Draft: 16.3' |
| uSpeed: 39 | uAccel: 2 | uDecel: 2 | uMR: 0.1 | uSR: 5 | Draft: 40.7' |
Design Notes
Frame is very cheap, very heavy for 32000 cf body and two 25 cf turrets.
Surface features include sealed, submarine hull, total compartmentalization,
basic stealth, basic sound baffling and basic IR cloaking. The boat has
advanced submarine hydrodynamic lines.
New Weapons
324mm torpedo: 6dx2834 HEC, Max 15,500 yds (8.8 miles), ASH,
skill 19, Speed 25 yds/sec; 1000 lbs, $542,000 each
[There are more basic versions with a less accurate guidance package
and longer range. Also, some torpedoes use HEDP warheads instead.]
324mm SeaScorpion anti-ship missile: 6dx65 (5) HEDP, Max 216,500 yds (123 miles), BALH, skill 17, Speed 350 yds/sec; 1000 lbs, $563,000 each
324mm torpedo launcher: slow autoloader, SS 25, ROF 1/8, 2000 lbs
30mmC chaingun: See 30mm chaingun, TL7, p.VE43 for basic stats.
Weight is reduced 40%, Malf is unchanged,
APDS: 6dx6(2), +50% range; SAPHE: 7dx3 (0.5) + 5d[2d]
4.5" missile: 114.3mm normal warhead, 6dx93[10d] HE or 6dx30(10) HEAT or 98 yrd radius CHEM, 1/2 Dam 2000, Max 4400, Acc n/a, SS 20, PRH homing (skill 14); missiles are $6000 (HEAT) and 40 lbs