Sabre-class Corvettes of the Martian Federal Navy


Shown: laser variant (left) missile variant (right)


Sabre-class Corvettes Mass budget: Weapons: 30tons -4x 2.5ton laser turret (10tons) -4x 2.5ton coilgun turret (10tons) -1x 10ton laser or missile array Habitat and life support: 70tons -10organics for 360days -Provisions: 36tons -Habitation: 34tons Rocket-skiff: 30tons Scopes and comps: 10tons Structure: 90tons Engine: 45tons Radiators: 25tons 300ton dry mass 900tons propellant 1,200tons total https://strout.net/info/science/delta-v/intro.html Exhaust velocity, specific impulse and delta-V of my fictional rocket: Walk: 12km/s (1223s) - 16.6km/s delta-V Sprint: 8km/s (815s) - 11km/s delta-V Both variants of the Sabre-class corvette are armed with four laser turrets and four coilgun turrets in addition to their primary frontal armament. The pulsed laser turrets have an average output of 13.5MW, with a 50cm aperture and a frequency agile resonator permitting infrared to ultraviolet operation to achieve 10cm spot sizes at ranges of 20-100km, enabling both point defence fire against projectiles as well as direct-fire against warships.    The coilgun turrets fire 180gram projectiles at 3.33km/s to achieve 1MJ of kinetic energy, with a sub-sentient fire-control AI providing an accurate direct-fire range of almost 30km, and virtually unlimited range for delayed orbital-denial fire due to the AI's trajectory prediction capabilities. The laser variant is equipped with a 750cm variable wavelength laser capable of maintaining a 10cm spot size at a range of 300-1500km with an infrared to ultraviolet beam, and an average beam output of over 450MW. The missile variant holds eight rail-boosted launch tubes for 75kg self-guided missiles with various nuclear and conventional warheads. Each missile is propelled by a solid rocket motor with an optional ablative-propellant laser-propulsion module that can be energised by an infrared beam from a turret laser. Note that the missile variant has an airlock within the nose of the craft while the laser variant does not - the airlock is primarily for ammunition resupply, but can also be used for crew transfer between docked vessels. The Sabre-class hull is powered by a solid-core electrothermal hybrid* reactor-rocket, capable of low-efficiency high-thrust "sprint" mode for combat manoeuvres, and high-efficiency low-thrust "walk" mode for the majority of orbital transfers. A crew of nine embodied sophonts operate the ship along with a cyborg or artilect mind housed in the ship's computer and interfaced with the various sub-sentient and semi-sentient ship systems. While the Sabre-class is not as fast or heavily equipped as fusion-powered torchships, it is far more economical for patrol and escort duties, and has even been adapted for strike missions during recent anti-piracy campaigns in the Main Belt. *vaguely based off this idea: http://toughsf.blogspot.com/2019/09/nter-nuclear-thermal-electric-rocket.html

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