#20X: 0 Sloop, 1 Subfrigate, 2 Frigate, 3 Cruiser, 4 Supercruiser, 5 Subcapital, 6 Capital, 7 Supercapital, 8 Dreadnought, 9 Superdreadnought

Where generic terms often use "Sub-x" and "Super-x", individual superclasses often use light/normal/heavy- denoted as L/N/H. This can be extended to U/L/N/H/S, adding ultralight and superheavy.

"x" is the generic descriptor for each size set, like so:

Military warships

The basic sizes for roles 1a, 1b, 2a, 2b, 3a, 3c are most often about 8 metres; for 1c, 2c, 3b, 3d they're about 16 metres. This means that a Line Superdreadnought may be 720 metres, while a Mobile Defense Base may actually be larger at 960 metres.

Government, paramilitary, and military support craft

"y" is used when a spacecraft uses the generic descriptor for the previous size set.

The basic size for roles in the 4 section is usually about 24 metres, while 5b and 5c are about 12 metres. 5a and 5d are about 6 metres.

Civilian craft

The basic size for roles in the 6, 7, and 8 sections are usually about 20 metres, while section 9 is usually about 10 metres.

It is important to note that military spacecraft are often smaller than their seaborne (or otherwise) counterparts. This has several causes- first is that spacecraft are considerably easier to build in three dimensions so a spherical spacecraft is considerably more viable than a spherical naval ship, and for the same volume as a destroyer either a 120 metre long 20 metre wide 20 metre tall ship or a 23 metre sphere will do, to give an extreme example. The second is that spacecraft can have more compact equipment- while life support is fairly bulky, not all of the ship needs to be pressurized. Much of the ship can be mounted outside of the pressurized area and not require internal equipment to maintain a vacuum. These combine to make a destroyer spacecraft, with a fairly similar role to a naval destroyer, be only 40 metres at maximum length.

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