So, since I’ve just described the nature of boarding actions, I might as well go ahead and describe the ship used to carry them out when necessary, the Marlinspike-class MAV.
And yes, this does mean that it’s horrible diagram time again.
The thing to bear in mind in considering the design of the Marlinspike-class is that it’s built to be disposable: much like the Sledgehammer-class drop shuttle and its kin with their habit of lithobraking, getting there is hard enough that survivability is up front and reusability takes a very distant back seat. And as such, the Marlinspike is about as stripped-down as a small craft can be and still function in role.
The basic hull form is exactly as the name suggests: it’s a narrow-tipped, heavily armored, slender spike, designed to hammer its way into the body of the boarding target and stick there. Its bow (1) is a hardened penetrator whose surface is configured as a contact-fused explosive plasma cutter; i.e., a shaped breaching charge. That’s designed to soften up the outer and pressure hulls of the target such that the momentum of impact (at the several hundred mph differential velocity traditional to this sort of maneuver) can drive the MAV in.
(That initial velocity, incidentally, is provided along with power and attitude control by a strap-on thruster pack (2), which is designed to detach and eject itself at the point of impact – because it has most of the expensive stuff in it, and can be salvaged and reused. Control up to this point is remote, from the parent craft, with limited local AI in the event of communication jamming.)
Once it’s penetrated the hull, the four strips of grip-track (3) located around the hull at 45 degree intervals come into play. Their job is to grab onto the wreckage around them and shove the MAV forward, powered by the onboard accumulators at (6), further into the ship, until it gets to the optimal – or at least a less pessimal – location for the squad of espatiers aboard to disembark. Said espatiers are located in a chamber in the center of the Marlinspike (4), sealed into their own armor (which provides their life support), doped up on anti-g and combat drugs, and strapped into racks in what amounts to a tank filled with concussion gel to protect them from the rapid acceleration and even more rapid deceleration of the ram-and-board maneuver.
Once one of the embarkation hatches (5) – a pair at the fore and aft ends of the chamber to both starboard and port, and a pair amidships to both dorsal and ventral, to allow for the inevitable mismatch between the MAV’s positioning and the target’s internal layout – is in a good position both for disembarkation, and vis-a-vis their target, the squad leader stops the MAV’s advance, detonates the shaped antipersonnel charge embedded into the outboard side of the embarkation hatch (basically the equivalent of a Claymore) to clear the way, then blows the hatch and leads his men out.
Victory or death!