NPRs generate a set of classes at start and may build any of them at any time. As technology improves there are certain techs that will trigger redesigns (new engines for examples) and any class affected by that tech will be replaced by a newer design for future ships.
Unfortunately in 6.43 that didn't seem to happen consistently. I knew the Earth spawned NPRs had Magneto-plasma engine tech but they were still using Ion engines as was an NPR I ran into early. In fact if I look at the Chinese for example they are still using Ion engines. The design below was built in June 2075, game date is September 2079, game started in 2025! The other Earth based NPR is researching Magnetic Confinement Fusion Drive and the player race has completed the first of the anti-matter drives.
Grim Reaper class Heavy Cruiser 19500 tons 313 Crew 3589.3 BP TCS 390 TH 1080 EM 0
2769 km/s Armour 4-64 Shields 0-0 Sensors 6/12/0/0 Damage Control 8 PPV 132
Annual Failure Rate: 1628% IFR: 22.6% Maintenance Capacity 920 MSP
Spare Berths 6
108 EP Ion Drive (10) Power 108 Fuel Use 72.8% Armour 0 Exp 10%
Fuel Capacity 1 750 000 Litres Range 22.2 billion km (92 days at full power)
CIWS-80 (2x4) Range 1000 km TS: 8000 km/s ROF 5 Base 50% To Hit
0cm C6 Soft X-ray Laser (66) Range 0km TS: 12500 km/s Power 0-6 RM 6 ROF 0 0 0 0 0 0 0 0 0 0 0
Fire Control S02 192-8000 (2) Max Range: 384 000 km TS: 8000 km/s 97 95 92 90 87 84 82 79 77 74
Tokamak Fusion Reactor Technology PB-1 (50) Total Power Output 400 Armour 0 Exp 5%
Thermal Sensor TH1-6 (1) Sensitivity 6 Detect Signature 1000: 6m km
Active Search Sensor MR180-R20 (1) GPS 5760 Range 180.3m km Resolution 20
Active Search Sensor MR360-R80 (1) GPS 23040 Range 360.6m km Resolution 80
EM Detection Sensor EM2-12 (1) Sensitivity 12 Detect Strength 1000: 12m km
ECCM-3 (1) ECM 30
This design is classed as a military vessel for maintenance purposes
When I examine their economy I find the NPRs are all in deficit (Indians -2642 balance +107 income, Chinese -3687 balance +456 income). The Indians managed to complete research into Internal Confinement Fusion drives and build it into new designs the Chinese did not. However both NPRs managed to build new ships. There does appear to be a disconnect somewhere.
Ian