The Firefly and Serenity Database

Serenity, Firefly-class in orbit

"This is why you'll never be in charge, Bree. You don't see the whole. The parts are crap, but you put it together you got a Firefly. Thing'll run forever they got a mechanic even half awake... Some people ain't lookin' for flash. She's a good catch."

The Firefly-class transport ship is a series of Multipurpose, Mid-Bulk Transport boats designed by Allied Spacecraft Corporation. The hulls and engines are constructed at ASC's shipyard at New Burbank, Osiris, with final outfitting being outsourced to a dozen smaller companies, including the newly formed Firefly Ship Works on Hera.

All Fireflys feature a large rear engine module, wing-mounted engines capable of vertical takeoff and landing (VTOL), a centralized cargo section, and raised forward section holding the crew quarters and bridge.

Series 1[]

Series 1 schematics

Series 1 & 3, side-by-side

The original Firefly series was approved for production in June 2434, with the first boats being completed in February 2435. Unlike later designs, the Series 1 did not have a modular cargo area, a secondary cargo area, or passenger berths. The design can dock a pair of optional two-man shuttles known as "Beetles" on the dorsal neck (above the crew quarters). These small craft have no dedicated cargo area, with the passenger sitting behind the one-man cockpit.

8,000 Series 1 boats were sold over the next twelve years before production was halted to make way for the Series 2 design.

Series 2[]

The Firefly Series 2 was approved for production in March 2447, with the first boats available for sale in 2448. The Series 2 was larger and more streamlined than the Series 1, adding a secondary cargo area (aft of the main cargo section) which could be outfitted with passenger berths.

The Series 2 also replaced the bulky engines used on the Series 1 with the all new Capissen 38 Mark II. The Capissen engines were a significant improvement in performance—doubling the ships top speed, while at the same time halving fuel consumption. Unfortunately, the new design was also more complicated and temperamental, leading to a notably higher failure rate over time. Despite the reliability issues, if properly maintained, the ship is amazingly maneuverable, and can still be found on the stunt circuit.

Only 5,000 Series 2 boats were sold, before production was halted to make way for the Series 3 design.

Series 3[]

03-K64-Firefly (port view)

For the specs on the Series 3, see Serenity.

The Firefly Series 3 was produced in multiple versions. The standard version was the 03-K64-Firefly produced for the civilian market. A Military Version—with multiple gun emplacements and wing mounted missiles—was approved for production in August 2463. Used during the Unification War, they were decimated by the Alliance Fast Attack Ship following the Battle of Sturges.

The Series 3 featured a number of improvements over the earlier models, notably the extenders below the wings of the ship to stabilize the rotating VTOL engines, and hold them further from the main body of the craft (which keeps the ship from shaking as much as previous series, and allowed for shuttle bays to be built into the sides of design above the wings). Also, the Series 3 is longer, with an extended 'neck', and generally roomier interior. It again uses the more reliable Trace Compression Block engine, rather than the Gurstler engine used in some other designs.

The VTOL engines are normally rotated to provide vertical or forward thrust but have a 270° range of motion. The exhaust can be pointed forward to provide reverse thrust. While not their normal operation, safeties can be disabled to enable each engine to be rotated independently, allowing for tighter turns than is possible with most propulsion systems.

No longer in production, 28,000 Series 3 boats were sold over the designs production lifetime.

Series 4[]

General Plans and Schematics

Mid-bulk transport (Class A)


Enhanced graviton accelerator core


4 Blue Sun EVT29-4000-A90 pulse-feedback generators
48 RCS thrusters


Allied Spacecraft Corp., Osiris
Firefly Ship Works, Ltd., Hera
Mandel & Earls, Ltd., Londinum

Manufacturer model no.

95 Mark VII

Hull no.


Ship length


Ship width


Ship height



L 374'-0" × W 97'-10" × H 88'-11"


142'-6" (to engine mounts)

Main engine dimensions

L 75'-0" × W 33'-7" × H 33'-7"

Empty weight

350,000 lbs

Maximum weight

865,000 lbs

Maximum payload

325,000 lbs

Crew capacity

15 (8 cabins, 1 dorm)

Passenger capacity

36 (6 staterooms, 12 berths)


5.5 G


750 A.U. (max fuel)
120 A.U. (max. payload)

Carried vessels

2 Endo/Exo-Atmospheric Shuttles
10 Emergency life pods
2 MF-950 Flying Mules (extended cab)

Other equipment

4 Magnetic grappler launchers
10 Self-powered transmitter buoys

The Firefly Series 4 was approved for production in January 2513, with availability projected for July 16, 2513. The Series 4 is 25% faster than the Series 3, and has twice the range. The main hull is significantly wider than a Series 3, with two side-by-side main cargo bays in the main section. Aft of this section the secondary cargo area is also larger accommodating proper passenger staterooms, or a larger number of berths. The boat also has room for twice the crew of a Series 3.

The larger amount of crew space has allowed for the addition of a dedicated land vehicle bay, a cargo elevator, and a small hydroponics garden. The main cargo section is modular, and can be adapted to pick up and drop off standard cargo modules without anyone entering the cargo bay itself.

With the increased size and capability comes a higher price tag, primarily for operating expenses. The increased cargo / passenger area is necessary to take jobs to maintain upkeep on a Series 4. This type is primarily used on the lucrative routes between the Central planets and the Border planets. For captains traveling the Rim planets and more interested in economy of operation, the Series 3 remains the better option.


  • In real life, the Firefly is a family of insects.


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