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PF-04 Protean Fighter by Kodai-Okuda PF-04 Protean Fighter by Kodai-Okuda


GOVERNMENT: Jovian Defense Forces/Neo-Hebrews of Saturn
TYPE: Protean Aerospace Fighter (PF)
MODEL: Titan-Technologies PF-04U Cosmo-Corsair
             FIGHTER MODE
             LENGTH: 37 feet
             WIDTH: 42.4 feet
             HEIGHT: 8 feet

             ROBOT MODE
             DEPTH:12.5 feet
             WIDTH: 16.2 feet
             HEIGHT: 32.2 feet

             DEPTH:2 feet
             WIDTH: 10 feet
             HEIGHT: 20 feet

MATERIAL: Crystal Composite
POWER PLANT: Macrotechnologies IPFF-1000 Ion Plasma Fusion Furnace
OUTPUT: 1000 megawatts
ARMOR TYPE: Crystal Composite
CREW: 1 Pilot


             1x DængJäger RWE-12 robot walker engine
             SPEED: 40 mph

             6x Stellar Dynamics SD-FT-1.2 1.2-megawatt fusion thrusters
             SPEED:7600 mph each (45,600 mph total)

             2x Macrotechnologies IPFE-32 32-megawatt ion plasma fusion engine
             SPEED: 15,200,000 mph each (30,400,000 mph total)


             PRIMARY (OFFENSIVE):
             1x  Titan Technologies TT-GP303AC triple-barrel 30-millimeter 2-ton autocannon gunpod;Effective Range: 864 yards; Payload: 600 rounds in a belt-fed autoloading detachable helical magazine; ROF: fires in bursts of 3, 12, or 30 rounds with a cyclic rate of up to 900 rounds per minute.

             PRIMARY (DEFENSIVE):
             2x Iapetus Arms IA-PC-10 ten-megawatt PHELAC gun; Effective Range: 80 miles; Payload: unlimited with nuclear battery clutch system; ROF: fires three blast per twenty seconds with a cyclic rate of nine blasts per minute.

             PRIMARY (ASSAULT):
             6x Saturn Arms SA-RFP-3 rapid-fire 3-megawatt PHELAC cannon; Effective Range: 24 miles; Payload: unlimited with nuclear battery clutch system; ROF: fires three blast per twenty seconds with a cyclic rate of 9 blasts per minute.

             SECONDARY (ASSAULT):
             16x Pallas Arms PA-MM103 three-shot mini-missile launcher with 10-pound fusion bolt (HEAP) or heavy fusion (nuclear) tipped warhead; Effective Range: 422 miles; Payload: 6 torpedoes each (96 total); ROF: 1, 2, or 3 at once each for a total of forty-eight missiles from all sixteen launchers at once in a single volley.

             TERTIARY (ASSAULT):
             6x Pallas Arms PA-MM105 five-shot mini-missile launcher with 10-pound fusion bolt (HEAP) or heavy fusion (nuclear) tipped warhead; Effective Range: 422 miles; Payload: 10 torpedoes each (60 total); ROF: 1, 2, 3 or all 5 at once each for a total of thirty missiles from all six launchers at once in a single volley.

             1x Iapetus Arms IA-PA-3 plasma axe (2.5-ton); Effective Range: melee; Life: 90 hours via its nuclear battery; ROF: normally about five swings every ten seconds or up to 30 per minute.

             (OUTSIDE ORDINANCE):
             The PF-4U was able to carry bombs, missiles, gunpods, and armor upgrade systems on externally mounted hardpoints.  These hardpoints were located all over the craft.  There was one large hardpoint on the outer side of each leg.  Each of the leg hardpoints was able to carry up to ten tons of ordinance.  Each “chest” section had a hardpoint designed for up to eight tons of payload. The arm hardpoints were designed for up to five tons of additional armor/systems, and the wing harpoints each had a five-ton hardpoint for additional armor, weapons, or other systems.  This gave the craft a maximum payload of 56 tons.


             1x Microwave Radio Communications array with a 12,000-mile range.
             1x LADAR array with a range of 20,000 miles.
             1x Passive EMS array with a 100,000-mile range.
             1x Active EMS array with a range of 1000 miles.
             1x Laser Communications array with a 120,000-mile range.
             1x Multispectral video/optical array with a range of 1000 miles.
             1x Gravitational/Antigravity Control Unit; Effect: Provides artificial lift, g-force compensation, and enhanced maneuverability.


             24x 24x Pallas Arms PA-AM2 4-shot 2-pound anti-missile bomblets; Effective Range: 200 yards; Payload: 40 bomblets each; ROF: 1-4 bomblets per discharge with a cyclic rate of 120 bomblets per minute.

             2x Macrotechnologies IF-20 I-Field omnidirectional ion field generators; Range: 300 feet from hull; Power Requirement: 20 kilowatts; Output: absorbs up to 40 gigajoules of energy weapon damage.

         The Macrotech engineers conceived of the PF-4U CosmoCorsair as a Special Forces transatmospheric attack fighter for the Saturn Space Navy of the Jovian Defense Forces.  This fighter was built off the basic design principles of the first Protean fighter, the PS-01.  However, the military planners intended the CosmoCorsair for an entirely different sort of mission, that being planetary assault. Initially, the military brass kept most of the PF-4U statistics secret from everyone involved with these Protean fighters.  Only the top military brass, designers, and engineers knew the exact performance capabilities of this craft.  The Saturn government went so far as to declare the fighter a “close-range” fighter only and required the main IPFE engines of the craft to be limited to 76,000 mph each engine (152,000 mph total) via the computer operating system of the space fighter.  After the 1st Interplanetary War was over, this limitation was no longer considered necessary, and the locks on the IPFE engines of the CosmoCorsair were removed allowing pilots to fly at full speed.
         The Saturn Defense Forces intended the PF-04U to act in the traditional aircraft role of a ground-attack fighter once it entered into the atmosphere of a planet like Earth, Mars, or Venus, and thus they chose a conventional airframe design.  This airframe was the famous World War II US Navy F-4U Corsair.  This airframe provided excellent maneuvering capability at extremely low altitudes that supersonic designs were unable to match.  The CosmoCorsair was a very capable fighter both in space and in an atmosphere.
      The primary engines of the PF-4U were a pair of Macrotechnologies IPFE-32 30-megawatt ion plasma fusion engines.  These engines were able to propel the CosmoCorsair at speeds of up to kiloMach 20 each (15,200,000 mph) or kiloMach 40 total (30,400,000 mph).  However, these engines were limited to speeds of only 76,000 mph during the last years of the 1st Interplanetary War due to secrecy concerns of the Saturn government.  After the war, the SDF removed the limiter, and pilots were free to fly the craft at its maximum speeds.  The designers intended the actual speed of the PF-4U to give the Saturn fleet a force of fighters capable of being launched from spacecraft carriers hundreds of thousands of miles from their intended targets.
      The secondary engines were six, independently moveable, Stellar Dynamics SD-FT-1.2 1.2-megawatt fusion thrusters.  These engines were capable of moving the ship at speeds of up to 7600 mph each or 45,600 mph for all six combined.  However, the main use of these engines was to generate a thrust cushion that the mecha used to skim over the ground in robot mode and glide over the surface or bodies of water. Normally, two of the engines were used to generate the cushion while four were used for forward propulsion, maneuvering, and braking.
         The PF-4U used the same robot walker engine as that of the PS-01A, one DængJäger RWE-12 128-megawatt mecha drivetrain.  This walker engine provided the same level of performance in the CosmoCorsair as it did in the Archangel and the same speed of 40 mph in all terrains.
         The weapons of the PF-04U CosmoCorsair were considerably more powerful than those of the main space fighter of the Saturn forces.  The armaments of the CosmoCorsair focused on heavy ground assault rather than the anti-mecha role of the PS-01A or anti-spaceship role of the larger PI-02 Raven Protean space interceptor.
         The main weapon of the CosmoCorsair was its Titan Technologies TT-GP303AC triple-barrel 30-millimeter gunpod.  This weapon fired plasma-tipped 30-millimeter autocannon rounds that the pilot could shoot in bursts of three, twelve, or thirty rounds with the simple flick of a switch on the yoke of his fighter.  This gunpod had a 600-round detachable drum magazine, which the CosmoCorsair could reload during combat, if necessary.  Normally the PF-4U was armed with three or four additional fully loaded drums on wing hardpoints carried outside the space fighter.
         Six Saturn Arms SA-RFP-3 rapid-fire PHELAC weapons made up the primary strafing weapons of the fighter.  The fighter sported six PHELAC guns mounted in two clusters of three, normally used only in fighter mode, though the pilot could opt to use them in robot mode if he/she chose to, but the guns had a wide angle of fire in robot mode and were difficult to use against small targets.
         A pair of Iapetus Arms IA-PC-10 PHELAC guns were mounted on the forearms of the machine in robot mode (under the chin of the fuselage in fighter mode).  These medium-energy cannons were used most often as an added punch to the six SA-RFP-3 rapid-fire PHELACs during strafing runs in fighter mode or as a medium-range defensive weapon in robot mode.
         The anti-mecha weapons of the PF-04U consisted of six Pallas Arms PA-MM105  and sixteen Pallas Arms PA-MM103 mini-missile launchers mounted in strategic positions on the fighter (eight on each leg and three on each wing).  These missile launchers were used against hardened targets like capital warships, space stations, bunkers, and heavy mecha.
         The last main weapon system of the CosmoCorsair was one Iapetus Arms IA-PA-3 plasma axe.  The intent of the proximal weapon was for use as only a defensive weapon, but Special Forces pilots learned quickly that the devastating cut of this plasma weapon could cut through an enemy battlerobot with ease and also do considerable damage to spacecraft.  Thus, the IA-PA-3 was used more as an offensive weapon system than its intended defensive role.
         The defensive systems of the CosmoCorsair were threefold.  First, the craft used three inches of crystal composite alloy plate armor that provided a high level of protection and allowed the wings of the ship to be used as parrying shields while in robot mode.  The second defense systems were a pair of Macrotechnologies IF-20 20-megawatt I-Field generators, one on each wing. These ion field generators provide enough protection to stop almost any energy weapon attack from mecha and light anti-mecha weapons employed on capital ships and other spacecraft. For defense against missiles, the PF-04U used twenty-four 4-shot Pallas Arms PA-AM2 2-pound anti-missile bomblets which sent out a decoy signal that was designed to cause all but television or direct-fire missiles to be attracted to them.  These systems had a moderately high rate of success and were considered adequate.
         Titan-Technologies produced the PF-04U in average numbers for the Saturn Special Forces and Space Marines.  The Saturn Colonial Forces did not use these craft in the colonial fleets that the Saturn government launched throughout the 2080s.  The PF-04U was not used in any memorable actions during the last years of the 1st Interplanetary War, but did prove in subsequent years that the “drop fighter”concept was a sound one, and that mecha transports, like the Ogre class, were no longer required to effect a planetary assault.

NOTES: This variable space fighter is from the science fiction novel series NEXUS ARCANA.  This work is protected by copyright, and all rights are reserved.  Please DO NOT copy, distribute or use this image without express permission of the creator of this work (Kodai Okuda).  Thank you.

Nexus Arcana Books.

Series 1
The Stygian Conspiracy Trilogy:

Shemyaza Awakens…

Ruins of the Ancients…

Children of Methuselah…
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Chiletrek Featured By Owner Jun 10, 2016
 I think I have deciphered most or all of the transformation :D . But every variable mecha is at least as tricky as the previous one ;P . What most callms my attention on this one is the axe, I see it is nuclear powered, but how is that it makes the glow and and, it's likely Gundam-style slicing abilities?
Kodai-Okuda Featured By Owner Edited Jun 10, 2016  Professional Digital Artist
Hi Chiletrek,

Thank you.
Yeah, this one took some time to get the transformation how I wanted it.
I worked it all out mechanically, and it would transform flawlessly, but parts of the fighter do have to twist, turn, and flip to do so. :D

The plasma ax is based on real-world plasma cutters like this one.…

The plasma generated by those cutters glow normally, so when suspended in a electro-gravitic field that loops the plasma continuously (like a chainsaw) it will create an intense glow. 
Can it cut like a Gundam Heat-hawk or Beam Saber?  Yes, it is super hot at over 50,000 Celsius (real-world cutters are currently 20,000 degrees) and can cut any Earth-made, or Prodono-made metals in the Nexus Arcana universe.  Other alien races that are vastly older and more advanced than the Prodono have metals this weapon would not damage, but those types of materials are too few and far between to matter at the time of the 1st Interplanetary War era.…

There are no known metals that can withstand that.
Chiletrek Featured By Owner Jun 10, 2016
 You are welcome! :) .

 So I was right that it had to be tricky, hehehe.

 The dual gas system is kinda neat as it seems help keep the desired shape of the plasma cutter. Very nice how there are things getting closer to our beloved beam sabers :icongundamplz: .
Kodai-Okuda Featured By Owner Jun 10, 2016  Professional Digital Artist
Hi ChileTrek,

Yes, the system used to maintain the shape of the plasma ax is rather complex.  A constant current provided by the nuclear battery keeps the plasma within the electro-gravitic field in a circular motion.  When the blade strikes an object it does not just burn it, it also cuts it due to the ionized particles spinning at high speed.  The spinning allows for a constant temperature of 50,000 degrees C (90,032 degrees F) to be applied to the target as the blade hits it.  Titanium based armor plates like Chobham would be melted instantly.
Chiletrek Featured By Owner Jun 11, 2016
 That sounds amazing, but here comes my next question: how costly would be to build those weapons? or to mass-produce them? because I am sure that, in more than 1 ocassion, the axe would get damaged or destroyed or lost in a battlefield.
Kodai-Okuda Featured By Owner Jun 11, 2016  Professional Digital Artist
Hi Chiletrek,

They are not very expensive as they are based on old techology for the 2070s.  Plasma cutters already exist today, and the manipulation of plasma via electromagnetics also already exits.…

Amateur inventors and tinkerers are also manipulating plasma with electromagnetic fields.…

The only mission component is manipulation of graviton particles, which the Prodono technology provided when LaGrange found the first alien wreck in 2035 AD.
Chiletrek Featured By Owner Jun 11, 2016
 Ohh, that's right, if based on what we have today, and with all the technological jumps in your storylines, then it should be relatively cheap to build those weapons. Could they clash? :D .

 Gravitons? well, that could be some of the only technobabble so far from you, because I am not sure their existence have been proven yet. But I can see how those could be useful to keep the integrity of the weapon blades.
Kodai-Okuda Featured By Owner Jun 12, 2016  Professional Digital Artist
Hi Chiletrek,

Gravitons are predicted to exist in Quantum Theory (Super String Theory to be exact) and one of the problems with them is that they may exist in higher dimensional space, but have influence in three-dimensional space in addition to wherever dimension that actual form or are from.  It is an interesting idea and I made it part of the Technobabble-lexicon of Nexus Arcana because it has a good chance of being proven true one day and there are mathematical basis for their existence.

The CERN institute has an article on the subject.…
(1 Reply)
single-leg Featured By Owner Jun 9, 2016
Cool. Need one for the Zero!
Kodai-Okuda Featured By Owner Jun 10, 2016  Professional Digital Artist
Thank you.
Nippon Military Industries of the Jupiter Federal Colonies builds a transformable Zero model for their Space Marine forces in the 2080s for the Outer Sphere War.
I did not do that one yet since I am focusing on the ships and vehicles of the 1st Interplanetary War of the 2070s. :)
single-leg Featured By Owner Jun 10, 2016
I hope by 2080(for real) we have at least a moon base or something..
Kodai-Okuda Featured By Owner Jun 10, 2016  Professional Digital Artist
It would certainly be nice, but if Hillary Clinton and the Democrats win this (or any subsequent) elections we will continue down the road to ruin.
single-leg Featured By Owner Jun 13, 2016
Trump is an admirable stop gap but I think we may be too far gone, we shall see..I'm thinking of what may come afterwards. This is why I enjoy post apocalyptic scenarios in fiction, anime, etc.

The Democrats are utterly vile and the Repubs are either cowardly sellouts or joining the hell with them all.
Kodai-Okuda Featured By Owner Jun 13, 2016  Professional Digital Artist
I agree.

The GOP and Dems are two trains heading for the same destination.
The Dems are the bullet train speeding for the cliff, and the GOP is a coal-powered steam train putting along at it, but BOTH are heading for the cliff.
single-leg Featured By Owner Jun 16, 2016
The pst designations and such are now gone, the future is going to be completely a new paradigm. It is exciting but also frightening, we are living an actual scifi dystopian post apocalyptic story but in slow motion and with no heroes..
Kodai-Okuda Featured By Owner Jun 17, 2016  Professional Digital Artist
I agree.
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Submitted on
June 9, 2016
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