[Spaceships] Homeworld-style Mobile Shipyard at TL9?

[jacobmuller]

I am Hopeless at formating threads (hints graciously accepted - but don't expect much - I can't even publish a blog never a mind a webpage)

Mothership
Craft dST/dHP Hnd/SR HT Move Lwt Load SM Occ dDR Cost
Ama 300 -2/5 13 0.03g 100kton 10kton +12 210ASV 10? $21 Billion

FRONT Power System Details cost Crew
1 Armour (Light Alloy, spread over entire hull) or Hanger? $50M/$10M 0/10W
2 Stardrive $1,000M 10W
3 Control: Comm 3AU; Sensor 3LS; level 10; $200M 20C/10W
4 Habitat 600cabins devoted to full life support for crew $100M+ 10W
5 Habitat 600 cabins of offices, med bay and entertainment, etc $100M+ ?C/10W
6 Robot arm $1,000M 10W
Core Radiation shelter for up to 600 bunks $20M 10W
CENTRE
1 Mining 500tons hour $100M 1C/10W
2-4 Hanger 10,000ton capacity $30M 30W
5,6+Core Factory $15M per hour $15,000M 30W
REAR
1 Power Plant Fusion 50years $1,000M 10W
2-4 Fuel eg $1M $100M -
5-6 Reaction Engine, eg Fusion Rocket 0.03g, 12mps DV $2,000M 20W

Rate of Construction
SM+5 or 6: $15M per day in the factory.
SM+7 to +10: $1.5M per day in the factory plus 12 tons per hour for assembly in the hanger.
SM+11 or bigger: $1.5M per day factory time plus 4 tons per hour assembly alongside.
Reaction Engine Options:
• Mass Driver $300M: can use anything for fuel, eg powered rock = free fuel or $10k/tank. DV 0.3mps/”tank”, 0.01g/drive But requires Power Plant.
• Nuclear Light Bulb $500M: uses hydrogen @ $10M/tank. DV 0.8mps/tank, 0.01g/drive.
• Fusion Pulse Drive $1,000M: uses nuclear fuel pellets @ $250M/tank. DV 5mps/tank, 0.02g/drive.
• Fusion Rocket $1,000M: uses either hydrogen @ $10M\tank or Water @ $100k/tank. DV depends on thrust and fuel but from 2-12mps/tank, 0.005g-0.03g/drive. I’d vote for water @ DV4mps, 0.015g.
• Antimatter Thermal Rocket $500M: uses Antimatter catalyzed fuel @ $60,000M/tank. DV1.8mps/tank, 0.1g. Can be high thrust and/or use water for x2/3/6 thrust and scaled DV.

[Sam Baughn]

Originally Posted by jacobmuller

I am Hopeless at formating threads (hints graciously accepted - but don't expect much - I can't even publish a blog never a mind a webpage)

The [code] tag lets you post in a fixed width font and keep your tabs. Just write it in Notepad, type [code], paste it and close the tag in the usual way.

Like so:

Craft 	dST/dHP Hnd/SR 	HT	Move 	Lwt 	Load 	SM 	Occ 	dDR 	Cost
Ama 	300 	-2/5 	13 	0.03g 	100kton	10kton 	+12 	210ASV 	10? 	$21 Billion

[SpaceGurper]

IIRC the Mobile Shipyard could take a beating and beat back multiple foes at once.

Same with the Mothership sure it can't take on an entire large scale armada but could handle most destroyers and lower without too much difficulty one on one or 5 destroyers to 1 MS/Shipyard

But what you wrote there Jacob doesn't include any armaments.

[vicky_molokh]

Allow me to clarify:

This is not about exactly duplicating a shipyard or (Sajukar forbid!) Mothership. It's about duplicating the producing capability of an orbital or other space shipyard in Spaceships terms, in such a way that a single shipyard dropped in the middle of an unknown but mineral-rich star system would be able to produce battlecruisers, or even more such shipyards (built externally, of course).

[David Johnston2]

Figure out what the SM of your battlecruisers is. The shipyard should be 5 to 6 size modifiers larger.

[vicky_molokh]

Originally Posted by David Johnston2

Figure out what the SM of your battlecruisers is. The shipyard should be 5 to 6 size modifiers larger.

So you're ruling out external construction completely?

[David Johnston2]

Originally Posted by Molokh

So you're ruling out external construction completely?

External construction would slow down your build time greatly. It's fine if you expect your operation to go for for a long time without being noticed. But since this operation sounds like it's intended to produce an unexpected strike force behind enemy lines, I'd think speed is a priority.

[SpaceGurper]

if one was building a BC inside then ya 5-6 sizes larger would be required, but externally and IIRC from SS6 that any size ship that can't fit inside can be built outside.

So if you have a SM+12 Shipyard and you wanna build a SM+13 Ship you could do so, just takes 3x longer and costs more. I just skimmed over it during this post so maybe I missed the limit.

From SS6 pg 5

If a vessel is even larger and can’t fit in a hangar bay, it can be assembled outside the station. The factory time is unchanged; the time required to assemble it is tripled (24 man hours times hull tonnage). If a spaceyard lacks on-site capability to manufacture parts, individual pieces are built elsewhere, shipped in, stored in cargo or hangar bays, and then assembled using the specified times. Production times can be sped up: Building a ship in two thirds the listed time doubles the cost; doing it in half the time triples it.

So that tells me that it takes the same amount of time as done in a hanger bay but externally.

So as for can it be done. Absolutely yes. Just takes a heck of a lot of man power (figure 3-4 shifts of 8/6 so work can be done 24hrs = less days) If it takes 40hr's to build something then it would take less then 2 days with shift work.

[vicky_molokh]

Originally Posted by David Johnston2

External construction would slow down your build time greatly. It's fine if you expect your operation to go for for a long time without being noticed. But since this operation sounds like it's intended to produce an unexpected strike force behind enemy lines, I'd think speed is a priority.

Well, not necessarily. It's a rather generic question.

[jacobmuller]

IDHMBWM
If a battleship were SM+12, it would easily fit into the hanger of an SM+16 mothership (unless I'm misremembering the numbers).

Scale the sort of thing I posted up by +4 SM, go for single hangers, emgim
nes, fuel tanks, factories... Add extra armour and weapon systems. Possibly Reactionless Drive.

Build time? Depends on a lot. A design from my own [heavily^] would cost $23,000M. SM+16 Mother build rate maybe $15M per day. Is that 5 years? I must be misremembering. Even speed built @ $70B that'd be 18months plus assembly.