TL-15 Defender Class System Defense Boat

This ship was designed using FF&S for the TNE system and is probably not convertable to other Traveller systems without major modifications.

The Defender Class SDB is a 300 ton gunboat designed to take on enemy ships much larger than itself. Intended as the last line of defense against invading vampire ships, the Defender is built around a 3.6 GJ Particle Accelerator spinal mount capable of blasting holes in the toughest of opponents. Complementing the particle accelerator are two 1000 MJ Laser Barbettes (non-gravitically focused).

The creation of confusion among one's opponents is also an important weapon. To that end, the Defender employs electronic countermeasures. The Defender comes with a 30 MW EMS Jammer (effective range 10 hexes), 30 sensor decoys (10 Laser, 10 AEMS, 10 PEMS), and EM Masking (4.2 MW).

If you're going to fight with the big boys, you've got to be able to take a hit as well. For defense the ship's outer hull is constructed of bonded superdense 3.57cm thick, giving the ship an armor rating of 100. There are also 2 Sandcasters.

Being part of the last line of defense means that you have to be in position at the time of attack or, at the very least, shortly thereafter. To that end, the Defender is capable of 6 G's of thrust and has enough fuel for 81 G-Turns. The fusion plant is rated at 1300 MW.

The Defender requires a crew of 13 and has accommodations for such.

The Defender costs 210.9 MCr to build. We feel that this price is reasonable considering the high end performance and firepower of the ship. It is a worthwhile investment for any world in or along the frontier.


Displacement:300 Tons
Volume:4200 m3
Length:60.05 meters
Target Size:Small
Configuration:Streamlined Needle
Hull Armor:100
Mass:3955.5/3840.1 (Loaded/Unloaded)


Power Plant: 1300 MW Fusion Power Plant (46.8 MW surplus), 1 year duration (130 m3 fuel)
G-Rating: 6G HEPlaR (150 MW/G), High Efficiency CG Lifter (30 MW)
G-Turns:81, 18.8 m3 of fuel each


Computer: 3xTL15 Fiber-optic Computers (1.1 MW each)
Communications: Maser (1000 AU; 0.6 MW) Radio (10 hex; 10 MW)
Avionics: Imaging EMS, inertial/gravitational positioning, 190 km/hr NOE
Sensors: Passive EMS folding array (6 hexes; 0.2 MW), Active EMS (8 hex; 13 MW)
ECM/ECCM: EMS Jammer (6 hex; 22 MW), 30 sensor decoys (10 Laser, 10 AEMS, 10 PEMS), EM Masking (4.2 MW)
Controls: No bridge, 7 normal workstations, fire control center (2 workstations), standard automation


Offensive: Spinal Mount. TL-15 3.6 GJ Particle Accelerator (Loc:1, Arcs:1, 1000 MW, 3m diameter, 60m Length 1 crew)
2 TL-15 1000 MJ Laser Barbette (Loc: 10,11 Arcs: All?, 65.4 MW, 0 crew)
Defensive: 2 TL-15 Sandcasters (Loc:10,11 Arcs: All, 1 MW, 1 crew)
MFD's:2xTL-15 (6 Diff Mods; 10 hex; 1.56 MW, 1 crew)

 ShortMediumLong Extreme
LB10:1/25-7920:1/19-5940:1/9-30 80:1/5-15

TL15 Sandcaster Beam Reduction:



Life Support: Extended (4138 m3 volume, 0.828 MW), Artificial Grav/CG (20.69 MW)
Crew:13 (3 Maneuver, 3 Engineer, 5 Gunnery, 1 Command)
Crew Accommodations:13 Small Staterooms (0.5 kW)
 3 Air Locks


Total Fuel Tankage:1648.8 m3 (117.8 tons)
Fuel Scoops: 10% of ship's surface, fills tanks in 1 hour.
Fuel Purification Plant: (4 MW) 12.4 hours to refine full tank
Power Surplus:46.8 MW

Price: 210.9 MCr


AreaSurface Hits Internal Explosion
1Antenna (1-2)PA
2-3AntennaElec (1-10) Hold (11-12) PA (16-20)
4-5EMMR (1-5)Hold (1-15) PA (16-20)
6-9 Qtrs (1-13) Hold (14-16) PA (17-20)
10,11  LB (1-8) Sand (9-12) Hold (13-16) PA (17-20)
12,14,15  Hold (1-16) PA (17-20)
13Air Lock (1-2)Hold (1-16) PA (17-20)
16-19 Eng (1-6) Hold (7-16) PA (17-20)
20 Eng (1-16) PA (17-20)


EMMR: 4hSS: 2hPP: 3HPA: 16H
AEMS: 1hLS: 7HMD: 1HLB: 1H
P-Ant: 2hAG: 1HFPP: 3HMFD: 2h
EMS Jam: 2hAll others: 1h

This ship was designed using Antti Lehtinen's Ship Builder Spreadsheet which is based on TNE's Fire, Fusion, & Steel.

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