Here's the Thunderhawk replacement.
-I will add mocking introduction later, watch this space-
Sanguinius Gunship
While the Thunderhawk is legendary for it's reliability and durability, it has always had more than it's fair share of problems. Remus Ventanus, Hero of Calth, predicted that it would be a stopgap design that would soon be replaced. That it would last more than ten millennia of service can only be considered a brutal irony. Three centuries after the death of the Emperor and the beginning of the Second Age of Strife, elements of the Adeptus Mechanicus from the Hellworld of Avernus took up the challenge of creating a replacement. With access to the records stored within The Rock and The Phalanx, they were able to redesign the Thunderhawk into what it should have been in the first place. The resulting craft would be named the Sanguinius, in honor of the fallen Primarch of the Blood Angel. It's performance characteristics and capabilities could only be described as striking.
The biggest problems the Thunderhawk had all revolved around the deck configuration, mostly due to the split of the forward and upper holds. The forward hold was too small to hold a Rhino, and the upper hold was too cramped to easily carry Jump Squads or Terminators. Disembarkation was only possible from the forward hold, with the side exits being tedious and impractical to use. The rear ramp of the forward hold was too small and awkward to actually use, and had been eliminated entirely in later models. Troop comfort was always considered rather poor. Finally, the rear engineering sections took up a disproportionate amount of space while rarely seeing any access while in flight.
The Avernus developers determined that the deck problems ultimately came from the decision to have the flight deck be similar to that of the Warhawk pattern Stormbird. While this did simplfy training, the Thunderhawk's smaller size made it's drawbacks much more pronounced. For the Sanguinius, the problem was solved by eliminating it entirely, the the crew now stationed in a "Virtual Cockpit" behind the troop bay. With this solved, the forward and upper holds were merged into one, removing the distinctive bulge of the forward hull. The main fuselage was widened by 2 meters, enabling the transportation of Rhinos. A similar increase in height enabled it to carry Razorbacks and Contemptor Dreadnoughts. The landing gear was replaced by a much more space efficient design, no longer having to deal with the forward bulge.
The rear engineering spaces were slightly more complicated to fix. The original intent behind them was to provide the crew with the capacity to make repairs and perform maintenance rituals in hostile environments. This proved to be almost completely redundant in actual service. Additionally, the presence of the dorsal mount added what was essentially an additional deck to the craft, limiting the height of the upper hold. These spaces were compacted, with in fight maintenance capability now being performed by a specially designed remote controlled servitor. The sensor and cogitator array was moved to be slightly behind the control compartment, with the dorsal mount's affiliated support components being place between that and the main engine. The M33 'Cygnus' Machine spirit was retained.
The engines were replaced with more compact and higher performance plasma ramjets, whose design had been found in the datamesh of the In Dying Light. These engines proved to be just as durable as their predecessors and provided a substantially smoother flight profile. The dorsal mount was replaced by a fixed Neutron Annihilator, being roughly equal is size. The wing mounted lascannons were removed, and the Heavy Bolter sponsons were replaced with ball turrets strait from the Helheim pattern Fire Raptor.
By far the biggest technical challenge was addressing the wings. The comically thick and stumpy wings were responsible for the majority of the Thunderhawk's handling problems. Despite their best efforts, the development team found no coherent explanation for their existence or configuration. It was eventually decided to remove them entirely, their removal compensated for by lining the fuselage with gravity-plates from the Diamondback hover tank. The side engines would then be enclosed in an armored sheath, with a pair of missile bay mounted above to replace the lost hardpoints. The rear turrets would mounted similarly to the forward ones, placed where the engine housing and missile bays met.
Armor thickness along the now smoother hull was increased by another 5mm, further increasing durability. Protection was further increased by the included on both a Flare Shield and a Ramjet Deflection grid. Efforts to mount a full void shield came at the cost of an unacceptable reduction of transportation capacity, and were ultimately abandoned. As a final defensive measure, Hexagramic wards were included in the ship's structure, protecting it and it's occupants from daemons and sorcery.
The Sanguinius was now faster, better protected, and more heavily armed. Transportation capacity been had increased to 40 Armored Marines or equivalents, and could fit two Rhino or Razorbacks. Within 40 years they had replaced the Thunderhawks of the reformed Legiones Astartes, and would soon surpass the reputation of it's predecessor. The Sanguinius would serve as the quintessential Astartes transport throughout the remainder of the Second Age of Strike. But perhaps the single greatest compliment it would ever receive would be given by Lion El'Jonson at it's unveiling. He stated, quite simply, that "his departed brother would have been proud."
Sanguinius Gunship
Planet of Origin: Avernus
Known Patterns: I-II
Crew: Pilot, Navigator, Gunner, EWAR
Powerplant: 3 x RX-120-00 Plasma Ramjets/Rockets
Weight: 140 tons
Length: 26 m
Wingspan: 26 m
Height: 8 m
Operational Ceiling:
Max Speed: 2500 kph approx.
Range: 30,000 km in atmosphere
Main Armament: Dorsal Neutron Annihilator
Secondary Armament: 4x Dual Accelerator Autocannons or Quad Heavy Impaler Turrets
Secondary Ammunition: 600 or 8000 rounds
Armor
Superstructure: 60mm
Hull: 70mm