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Shipbuilding methods

In regards to the architects:

The height of a deck is not a fixed value, as far as real world military ships go. Most of the decks on my ship were about 3 meters apart, but even on the same deck you had some variation. SOme decks were as far as 5 meters apart! (Maybe more, I never measured it.)

In general, the Navy doesn't have that many people higher than 6.5 feet tall (call it 2 meters). So ceiling height needs to be at least 7 feet. However, what you aren't like aware of is all the air ducts, wiring, water pipes, and bracing that runs across the topside of just about every space, most especially P-ways (passageways). Berthings will have a little more of this than usual, due to the need to connect with the Head (bathroom). Several showers, toilets, sinks, drains, hot and cold water... Not to mention firemain, fuel lines, and God knows what else.

So about 2-3 feet of the top part of a space is going to be all this CRAP. Call it Life Support, since that's pretty much what it is. That's why most decks are bout 10 feet apart.

Some electronics spaces have a raised decking, or false-decking, and the extra cables for the gear is under that. This deck is usually a foot high or so, and there's rarely room to crawl in there comfortably, but it could be done. I don't think it goes between bulkheads though, so your PCs can't use it as a secret passage, only a secret hiding place.

Some of these spaces also seemed to have a lower ceiling than the usual; I think that may be because of armor and protective waste-spacing. But in general, you can draw your designs the way you want; there's no hard rules to it, and there are even spaces where a 6-foot person has to duck.
 
TheDS has a good point. I'm about 5'9", and could touch the deckhead of most passages with the palm of my hand. On subs, I had to keep ducking my head, or it would scrape along cable tracks, aircon vents etc....

Although, having said that, in the Trav universe, you don't see many messdecks that sleep 50+ personnel in one space.....

I normally have deck to deckhead of about 2.5m and hide all the cabling etc above that, in the crawl space.

I guess it all comes back to IMTU/UYTU... ;)
 
To TheDS and Rotter...
Excellent, excellent. Buildings, as you probably already know or at least guessed, are built in very similar ways.
All my cross sections show about 24" of "blank" space between the finished floor of one deck and the ceiling of another, leaving around 8'-0" of clear head room. This is a typical condition. Some area my need up to three feet of space only leaving 7'-0" head room.
Within the two to three feet of space are the floor structure, between 8" and 16" of structure, depending on the free span, and the rest is space for force air ducts, chilled/hot water pipes, communication conduits, (plasma ducts?), lighting fixtures etc... And don't grav plating for the floors! In any case, my working knowledge of ship structure is very limited. I assume structural members can be smaller, because of stronger alloys etc... But you guys at least get the concept I was trying to get across. Too many times in the past, I have seen deck plans and cross sections where wall, bulk heads, and exterior walls are just pencil line. My exterior walls (hull) are always about 12" thick. This doesn't mean 12" of solid steel! But it includes the structural "skeleton" plus hull plating, insulation between structural members, and interior pressurized inner hull.
By the way, does anyone know how thick standard hull plating is? I'm going to assume 1/4" steel/alloy/futuristic composite "stuff".
Any thoughts or comments?
Great stuff!
Jaknaz
 
Originally posted by Jak Nazrith:

By the way, does anyone know how thick standard hull plating is? I'm going to assume 1/4" steel/alloy/futuristic composite "stuff".
Any thoughts or comments?
Jaknaz
FF&S (TNE's factory) used a toughness rated scale for materials which let you calculate the armor rating based on the thickness (or more often the way I did it, how much armor could I plate on for a given mass and then see what protection I had). Ships required a certain level of armor based on maneuver drive performance for protection from microdebris impact while operating. So as some examples of the minimum (i.e. 1G drives) spaceship hull platings across the TL's:

TL____Material____Thickness (rounded)

3______Iron__________________6.66cm

4______Soft Steel_____________5.88cm

5______Hard Steel_____________5.00cm

6______Titanium Alloy__________3.33cm

7______Light Composites________2.50cm

8______Composite laminates_____1.66cm

10_____Crystaliron_____________1.25cm

12_____Superdense____________0.71cm

14_____Bonded Superdense_____0.36cm
 
IMTU, Shipyards have a variety of methods.

the most common, IMTU, is as follows:
1) Major Hull Assembly: the spine is laid, and major block element tethers assembled to it.

2) Major Block hull assembly: concurrent with step 1, the major blocks have their hulls assaembled, often around major components (like bays and drives)

3) Block filling: blocks are next fitted with all the vaccum-tolerant stuff. Staterooms and such are usually put in as modules. Unusual ones will be custom made modules. Bays and turrets are placed as sockets only. Wiring harnesses are installed. modules are tested before porceeding.

4) gross assembly: The modules are now affixed to the spine. The module wirings are interconnected. Systems are tested. First flight usually occurs here.

5) Top-out: the ships is moved to a pressurized bay, and painting, final interior fitting, and custom interior works are done. huge ships never enter the pressurized bay, but they have enough bays to accomodate the needs for top-out.

6) Armament: The guns are finally lodged in their turrets and bays.

7)shakedown cruise occurs: tests are run on EVERYTHING.

8) redress: Any failures in shakedown are taken care of.

9 Delivery.

Most of the work is done using automation with human oversight. Nano-welders are used by the tone for controlled welds in concealed locations; most are removed for recharge and reuse, but some are abandoned in place.

Most TL 9 ships are either "Shuttles", which are usually built as aicraft or rockets dirtside, or as "Deep Space Vehicles", from modules sent up by shuttles.

Gravitics is what makes the orbital yards profitable... it reduces the cost to orbit by SEVERAL orders of magnitude. (Which is why NASA looked into it.... if it could be real, it could make life SO MUCH CHEAPER!)
 
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