Design of my current shorter 3 year deployment life survey ship that I am using to poke around 2 systems out from my border colony. Have yet to have the 20% conditional trigger and typically unless I babysit them the Jump engine and/or engine will drop whilst the crew insist their supplies are sufficient to continue operation:
Horizon class Survey Ship 16,000 tons 396 Crew 3,047.1 BP TCS 320 TH 3,200 EM 0
10000 km/s JR 3-50 Armour 1-56 Shields 0-0 HTK 104 Sensors 234/162/3/3 DCR 28 PPV 0
Maint Life 4.15 Years MSP 5,332 AFR 73% IFR 1.0% 1YR 495 5YR 7,424 Max Repair 1280 MSP
Captain Control Rating 1 BRG
Intended Deployment Time: 36 months Morale Check Required
J16200(3-50) Military Jump Drive Max Ship Size 16200 tons Distance 50k km Squadron Size 3
3200EP M-MCF 8k 0.057L (1) Power 3200 Fuel Use 5.72% Signature 3200 Explosion 8%
Fuel Capacity 1,882,000 Litres Range 369.9 billion km (428 days at full power)
TMS18 1k(120.9M) 650T (1) Sensitivity 234 Detect Sig Strength 1000: 120.9m km
EMS18 1k(100M) 450T (1) Sensitivity 162 Detect Sig Strength 1000: 100.6m km
Advanced Gravitational Sensors (1) 3 Survey Points Per Hour
Advanced Geological Sensors (1) 3 Survey Points Per Hour
This design is classed as a Military Vessel for maintenance purposes
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Put together longer 10 year deployment time survey design that loses speed with the intention being largely to cut down max repair to push longer maint life more than anything else, not put it out on the field yet but it's pretty typical of what I'd usually use (except slightly slower, I'd normally have a slightly larger engine and EP output with 2 or so less months of maint life in terms of MSP) and find that the resupply conditional rarely triggers and the ship finds itself with dead engine or jumpdrive and stranded before the 20% conditional has brought it back to resupply.
Voyager X class Survey Ship 16,000 tons 383 Crew 2,548.4 BP TCS 320 TH 1,998 EM 0
6242 km/s JR 3-50 Armour 1-56 Shields 0-0 HTK 105 Sensors 40/162/3/3 DCR 39 PPV 0
Maint Life 11.42 Years MSP 10,282 AFR 53% IFR 0.7% 1YR 145 5YR 2,170 Max Repair 848.9375 MSP
Captain Control Rating 1 BRG
Intended Deployment Time: 120 months Morale Check Required
J16200(3-50) Military Jump Drive Max Ship Size 16200 tons Distance 50k km Squadron Size 3
1997EP M-MCF 4.7k 0.087L (1) Power 1997.5 Fuel Use 8.69% Signature 1997.50 Explosion 8%
Fuel Capacity 4,040,000 Litres Range 523 billion km (969 days at full power)
TMS18 1k(50.3M) 113T (1) Sensitivity 40.50 Detect Sig Strength 1000: 50.3m km
EMS18 1k(100M) 450T (1) Sensitivity 162 Detect Sig Strength 1000: 100.6m km
Advanced Gravitational Sensors (1) 3 Survey Points Per Hour
Advanced Geological Sensors (1) 3 Survey Points Per Hour
This design is classed as a Military Vessel for maintenance purposes
Edit: This discussion has caused me to think more about some long standing design habits I've had since VB and I picked up I am mostly always favouring engineering modules over maintenance storage as the former always seemed more efficient to me in that they reduced the need for frequent MSP consumption over just stacking on more MSP to be consumed more frequently.
Toying around with variations of the Voyager X design above and noticing that in terms of tonnage investment, maintenance storage can push maint life significant more for less tonnage investment which certainly helps me see better why the trend of the posts here are favouring stacking up MSP and maint life and not even touching the conditionals at all and accounts for entirely different experiences with the whole thing and why the 'MSP < Max Repair' conditional certainly wouldn't really help any in that case and if anything would just make it worse. May definitely be a change in approach I adopt as well now, though is still more a bypass for the lacking functionality of the conditionals but certainly one I am likely to adopt as well.