On Sun, Sep 14, 2014 at 11:51 PM, Evyn MacDude <evyn.macdude@gmail.com> wrote:
> On Sun, Sep 14, 2014 at 7:12 PM, Peter Berghold <salty.cowdawg@gmail.com> wrote:
>
>> The SpruCans were 563 fee long with a 52 foot beam.  The crew was (when I
>> was aboard) 15 officers and 225 enlisted crew.  When I plugged the
>> displacement (8000 tons)  into MT rules and tried to put a ship together the
>> numbers just didn't add up.
>>
>>
>> Thoughts?
>
> The 1st thing I saw it that you were trying to use the displacement of
> water for the displacement number. I would divide by 14 to get it's
> Traveller displacement. which is about 600 dtons.
>
> --
> Evyn

That won't be right, either.   Ship displacement is the weight of the
water the ship displaces when afloat, which is a measurement of mass,
not a measurement of the volume of the ship.

http://en.wikipedia.org/wiki/Displacement_(ship)

Modern displacement tonnage is a measure of the ship's mass, not volume.

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.

Dan

--

"Any sufficiently advanced parody is indistinguishable from a genuine
kook." -Alan Morgan