This is the multi-purpose ship I'm using. Trying to assault ships traveling at 400-600kps
NAV Satie II class Cruiser 25,000 tons 624 Crew 7410.725 BP TCS 500 TH 360 EM 0
4500 km/s Armour 36-76 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 31 PPV 128
Maint Life 1.13 Years MSP 2038 AFR 454% IFR 6.3% 1YR 1619 5YR 24286 Max Repair 1139.0625 MSP
Intended Deployment Time: 14 months Spare Berths 0
Cryo Drop Capacity: 1 Battalion
1125 EP Magnetic Fusion Drive (2) Power 1125 Fuel Use 11.53% Signature 180 Exp 9%
Fuel Capacity 2,500,000 Litres Range 156.1 billion km (401 days at full power)
25cm Railgun V3/C5 (16x4) Range 150,000km TS: 4500 km/s Power 15-5 RM 3 ROF 15 5 5 5 3 2 2 2 1 1 1
Fire Control S02 160-4000 H50 (2) Max Range: 320,000 km TS: 4000 km/s 97 94 91 88 84 81 78 75 72 69
Magnetic Confinement Fusion Reactor Technology PB-1 (2) Total Power Output 80 Armour 0 Exp 5%
Active Search Sensor MR4-R1 (50%) (1) GPS 42 Range 4.6m km MCR 503k km Resolution 1
ECCM-2 (2) ECM 20
This design is classed as a Military Vessel for maintenance purposes
Actually this just happened (trying to board a ship 125km/s):
My ships are running 36 times faster than this one. 100% casualties.