The Thunderbolt-class Strike Cruiser is a Blacktron Alliance fleet battlecruiser based on the Fury-class Heavy Cruiser but armed with a supermassive hyperrelativistic railgun.
The Fury-class is considered by many observers to be one of the most versatile of Blacktron warships due to the several variants it has spawned, including not only the Thunderbolt-class but also a Marine assault variant (the Nemesis-class) and an extensively modified hospital ship (the Hippocrates-class).
The base Fury-class are armed with a pair of triple-mounted 50cm high X-ray laser turrets dorsally and three ventrally, plus six side-mounted sponsons with three 25cm lasers apiece, with frequencies in the low X-ray/high UV range.
For close assault, the baseline Fury utilises a trio of heavy 60cm plasma accelerators mounted forward, plus various lighter 10cm point defence laser clusters.
The Thunderbolt-class modifies the baseline Fury by dispensing with all three ventral 50cm X-ray laser turrets plus one of the plasma accelerators and rerouting power to the hyperrelativistic railgun. The 10cm laser point defence clusters are upgraded to 12cm mounts with a faster cooling cycle between shots, given how Thunderbolts draw enemy fire.
The three quantum-gravitic antimatter engines are unchanged from the baseline Fury-class. The Galactic Federation believe that quantum gravity engines are too dangerous and unstable for normal use, so they utilise the slower linear induction drives for normal-space manoeuvring and hyperspace jump engines for interstellar transit. Quantum gravity engines generate a wormhole-like gravitational singularity which at lower power settings acts to propel the ship forwards sliding down an inclined plane of spacetime, and at higher power settings creates a full-scale directed temporary wormhole allowing point-to-point space jumps. The technology releases a certain amount of dangerous cosmic radiation, however, especially at the high-power spatial jump settings.
The Federation considers the Thunderbolt-class to be a terror weapon because of the destructive power of its EL-3(T) railgun. Nicknamed the “Elephant Gun”, it fires a 12.5-tonne nickel-iron-banded titanium cylinder to velocities approaching 85% of lightspeed. At that velocity, the kinetic energy of the projectile is well into the dinosaur-kilker range, and unconfirmed rumours exist of 2000km diameter planetoids actually being broken apart by Elephant Gun strikes.
The Blacktron Alliance consider the Thunderbolt-class a deterrent against ongoing Federation encroachment on its sphere of influence as agreed in the 2247 Treaty of Achernar. The politics of Federation-Blacktron interstellar relations are murky at best, and the Treaty of Achernar is only one of a string of “binding treaties” broken or abrogated by one side or the other.
At 28 inches long (71cm, or 75 studs), this is my largest Blacktron construction to date.
I was actually shocked that it ended up so much longer than my spacewhale, but that’s what the tape measure says. It’s a smaller volume ship, obviously, but yes, it’s a full 11 studs longer than the Cetus.
It’s also a lot more conventional in construction, without the internal Technic framing, multidirectional structural (rather than decorative) SNOTwork and clever technique. I rather like it anyway, but it’s just a lot less clever.