Under FF2, a good 'rule of thumb' is to think of PAW diameter the way you would inches for Dreadnought-era guns - a four meter x 32m PAW goes on a frigate, light cruisers get 6mx48m and so on. It would be pretty trivial to put pre-built PAWs onto a table, together with their power demand at a shot every 30 seconds.

Incidentally, a second good 'rule of thumb' is not to buy Auric-Tech's ships, unless you prefer gold-plating on everything ;)

On Tue, Sep 16, 2014 at 11:52 AM, John Groth <aurictech@cox.net> wrote:
Grimmund wrote:

<<snip>>

Spitballing some numbers, I get about ~3000dtons for the Spruance:

http://www.militaryfactory.com/ships/detail.asp?ship_id=USS-Spruance-DD963

gives dimensions of

ength: 563ft (171.60m)
Beam: 55ft (16.76m)
Draught: 20ft (6.10m)

and a crew of 393 officers and ratings.

  Side view here:

http://www.the-blueprints.com/blueprints/ships/destroyers-us/7849/view/uss_dd_979_conolly__spruance_class_destroyer_/



meters, l*w*d

Draught, 6 meters.  If I understand correctly, this is waterline to
low point of keel:

172*17*6

Another 5 meters to the deck, above the waterline, estimated:

172*17*5

And the superstructure, estimated  (this is a total SWAG on my part)

120*14*6

Check the photo here and add your own adjustments
http://upload.wikimedia.org/wikipedia/commons/e/e0/US_Navy_030321-N-6141B-006_The_Spruance_class_destroyer_USS_Briscoe_%28DD_977%29_underway.jpg



totals a little over 42,000 cubic meters, divided by 14.25 is just
under 3000 traveller dtons.

Thes, this treats the ship as a regular solid body rather than as a
streamlined body, and does not consider volume lost to streamlining.

 A number of years ago, I used the Akins FF&S2 spreadsheet to design the _Deyo_-class destroyer*, and ended up with a displacement of 3000 dTons.  This matches the displacement of the _Midu Agashaam_-class destroyer, so this seems to be the size Imperial Navy planners expect for peacetime destroyers.

I think I'll do some tweaks to the ship (I last worked on the design in January 2008 [file version "Deyo2b"]) and do a writeup.

*Note that, _contra_ this Traveller wiki site's page on destroyers,

http://wiki.travellerrpg.com/Destroyer

AuricTech Shipyards equipped the _Deyo_-class with a spinal NPAW mount.  Why?  Because of some of the sweetest words a defense contractor can ever hear:

"Cost-plus contract**" :-D

Besides the obvious financial benefits that various cost-plus contract structures provide to AuricTech Shipyards, keep in mind also that FF&S2 doesn't simply provide a pre-built list of spinal-mount weapons.  FF&S2 allows for spinal-mount weapons of any size, with the primary limiting factor being the length of the ship on which the spinal-mount weapon is to be installed.  As such, AuricTech Shipyards has designed ships that mounted "spinal" NPAW weapons that were smaller than HG-based NPAW bay weapons (the advantage being that spinal-mount weapons are less vulnerable to damage when using Bruce Alan Macintosh's Military Combat System for T4 ships that are designed using the FF&S2 rules).

**See

http://en.wikipedia.org/wiki/Cost-plus_contract

for details, with the stipulation that AuricTech Shipyards generally will only accept cost-plus-fixed-fee or cost-plus-award-fee contracts for Imperial forces.  Private buyers who are willing to sign a cost-plus-percentage-of-costs contract will receive the most exquisite vessel their CrImp can buy (and our Sales and Finance Department is quite capable of determining how many CrImp a given buyer can afford).

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