I have constructed 13 of the following design in my game:
Tote2 class Carrier 2,136 tons 39 Crew 245.8 BP TCS 43 TH 0 EM 0
1 km/s Armour 1-14 Shields 0-0 HTK 12 Sensors 0/0/0/0 DCR 2 PPV 0
Maint Life 10.41 Years MSP 179 AFR 15% IFR 0.2% 1YR 3 5YR 45 Max Repair 25 MSP
Hangar Deck Capacity 1,650 tons
Commander Control Rating 1 BRG
Intended Deployment Time: 3 months Flight Crew Berths 33 Morale Check Required
This design is classed as a Military Vessel for maintenance purposes
This design is classed as a b for auto-assignment purposes
The first one was built 23 years ago.
The design was obsoleted 10 years ago.
So I built roughly one per year during that window.
Three of the 13 ships suffered catastrophic failure and exploded.
Does anyone have any idea why?
The most recent ship exploded when its maint clock was at 0.5 years.
It had 100% MSP on board at the time (179, with a Max Repair of 25), and no damaged components.
The components:
Amt Component DAC%
6 Boat Bay 74.4
3 Boat Bay - Small 9.3
2 Engineering Spaces 4.7
2 Crew Quarters 4.7
1 Engineering Spaces - Small 2.3
1 Crew Quarters - Tiny 2.3
1 Bridge 2.3
2.46 High Density Duranium Armor -
EDIT:
Could it be
this bug?
The bridge and the boat bays are marked as NoMaintFailure in the DB.
That's 86% of the DAC.
Which means hitting one of those 20 times in a row would be a ~4.9% chance.
Given a nominal AFR of 15%, and approximately 13 * 16 = 208 ship years the design has been in use, one would expect approx 208 * 15% = ~31 maint failures, multiplied by the average maint life of the ships over time (to account for AFR being multiplied by years since overhaul).
31 maint failures at 4.9% chance to cause catastrophic failure yields about 1.5 expected explosions.
These ships often spend several years between overhauls. Of the current ships, the average maint time at present is about 2.5 years. So 3 explosions would seem to just represent an AFR multiple of 2. A perfectly cromulent expectation.
SJW: Fixed for v2.0