Mk I
Mk III-IV
from FASA Star Trek© Starship Tactical Combat Simulator – Federation Ship Recognition Manual (2nd Edition)
NOTES:
The Derf class tender has been operational in Star Fleet for more than 25 years. When it entered service on Stardate 1/9807, the Derf class marked a new concept in navigational beacon repair. Before its introduction, marker buoys and navigational beacons had to be retrieved and returned to a repair facility to be serviced. Derf class tenders eliminated this need because they carried repair facilities on board.
When a Derf arrives at a malfunctioning beacon’s location, a shuttle uses a tractor beam on the beacon and tows it into the lower hull, which is the tender’s main repair facility. The beacon is then placed on an assembly line and repaired robotically. When the work is finished, the shuttle tows the beacon back into the spacelanes, and the Derf moves on.
Although the Derf is not designed as a fighting vessel, it is capable of aggressive defense. Most repair missions take place along the borders between the major powers, where the chances of encountering enemy ships is very high. Because of this high risk, the Derf is armed with medium-range phasers
This protection does not prevent them from falling prey to enemy ships. On Stardate 2/0702, the USS Acropolis responded to signals from a malfunctioning marker buoy. As its shuttle neared the beacon, a Klingon warship appeared and opened fire before defensive action could be taken. The volley crippled the Acropolis’ engines, and the tender was boarded and towed into Klingon territory.
Intelligence later discovered that the beacon had been planted by Klingon operatives to entrap the repair tender. It is theorized that the Klingons gained technical information concerning robotics and repair techniques that they lacked, but it is not known just what gain this action brought them in the overall situation. Some analysts believe that study of the robotic repair systems will make it possible for Klingons to alter the functioning of navigation beacons robotically, creating potential havoc in border space-lanes.
Of the 545 Derfs built, 16 Mk Is, 362 Mk Ills, and 68 Mk IVs remain in active service, and 38 Mk Is and 17 Mk Ills are in reserve fleets. Two Mk Is and 2 Mk Ills are used by Star Fleet Training Command; 12 Mk Is, 8 Mk Ills, and 1 Mk IV have been destroyed; 1 Mk III has been captured by the Klingons; 1 Mk I and 3 Mk Ills are listed as missing; 4 Mk Is, 4 Mk Ills, and 2 Mk IVs have been scrapped; and 2 Mk Is have been sold to the private sector.
The Derf Class was built at Merak. The rate of production peaked at 4 per year.
| Construction Data: | |||
| Model – | Mk I | Mk III | Mk IV |
| Ship Class – | IX | IX | IX |
| Date Entering Service – | 2256 | 2262 | 2276 |
| Number Constructed – | 180 | 396 | 71 |
| Hull Data: | |||
| Superstructure Points – | 14 | 14 | 17 |
| Damage Chart – | C | C | C |
| Size: | |||
| Length – | 274 m | 274 m | 274 m |
| Width – | 128 m | 128 m | 128 m |
| Height – | 65 m | 65 m | 65 m |
| Weight – | 126,860 mt | 127,820 mt | 133,275 mt |
| Cargo: | |||
| Total SCU – | 350 SCU | 350 SCU | 350 SCU |
| Cargo Capacity – | 17,500 mt | 17,500 mt | 17,500 mt |
| Landing Capacity – | None | None | None |
| Equipment Date: | |||
| Control Computer Type – | M-2 | M-3 | M-3 |
| Transporters: | |||
| Standard 6-person – | 2 | 2 | 2 |
| Cargo – | 1 | 1 | 1 |
| Other Data: | |||
| Crew – | 72 | 72 | 72 |
| Passengers – | – | – | 10 |
| Shuttlecraft – | 7 | 7 | 5 |
| Engines And Power Data: | |||
| Total Power Units Available – | 27 | 40 | 40 |
| Movement Point Ratio – | 3/1 | 2/1 | 2/1 |
| Warp Engine Type – | FWD-1 | FWD-2 | FWD-2 |
| Number – | 2 | 2 | 2 |
| Power Units Available – | 12 ea. | 18 ea. | 18 ea. |
| Stress Chart – | L/G | M/G | M/G |
| Max Safe Cruising Speed – | Warp 7 | Warp 6 | Warp 6 |
| Emergency Speed – | Warp 9 | Warp 8 | Warp 8 |
| Impulse Engine Type – | FIC-2 | FID-2 | FID-2 |
| Power Units Available – | 3 | 4 | 4 |
| Weapons And Firing Data: | |||
| Beam Weapon Type – | FH-4 | FH-4 | FH-4 |
| Number – | 4 | 4 | 6 |
| Firing Arcs – | 2 f/p, 2 f/s | 2 f/p, 2 f/s | 2 f/p, 2 f/s, 2 a |
| Firing Chart – | Q | Q | Q |
| Maximum Power – | 3 | 3 | 3 |
| Damage Modifiers: | |||
| +3 | (-) | (-) | (-) |
| +2 | (1-8) | (1-8) | (1-8) |
| +1 | (9-14) | (9-14) | (9-14) |
| Shield Data: | |||
| Deflector Shield Type – | FSH | FSH | FSI |
| Shield Point Ratio – | 1/2 | 1/2 | 1/3 |
| Maximum Shield Power – | 12 | 12 | 12 |
| Combat Efficiency: | |||
| D – | 63 | 95 | 129.3 |
| WDF – | 10.4 | 10.4 | 15.6 |