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18th Century British Gun Ports

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My current project is a POF Dockyard Model of the Dolphin built to the modified 1719 20's Establishment Keel was laid down in January 1730 and launched in January 1732, she was converted to a fireship in 1755 and renamed the Firebrand, she was again converted back a sixth rate in 1757 and renamed Penguin she was taken by two French frigates off Oporto Bar on the 28th March 1760. There is a very fine contemporary model of her in the Greenwich Maritime Museum, I have a copy of her Draughts and was very lucky to obtain numerus photographs, I had also visited Kew many times to study and copy many of her pages of logs. The Model Cat#1731-2 was made by John Hancock a shipwright at Deptford.
I've laid the keel, constructed the 84 frames including cants assembled the hull and am now at the stage of transferring the gun port tracing to the broadside. All other two models one completed and another at the planking stage are both smaller ships, the finished model is the Fly class sloop the Ranger 8 x 3 + 10 swivels launched October 1752 and ongoing is the Swan class sloop the Nymph 14 x 6 + 14 swivels, both of these ships had open gun ports with no Lids so the gun port opening was as per the drawings. So my question is the gun port size? my blueprint of the Dolphin draught shows 2' 3" fore and aft the photo's show 2' 3" fore and aft, Page 106 of the "ship Repository 1788" which is the only reference I have for gun ports states Ship of 20 guns: fore & aft 2' 3" the ports with gun lids have a cil about 2" +- deep which would make the lidded ports outer layer of planking 4" wider than the other unlidded ports so are the lidded ports gun openings actually narrower?
 
The Treatise on Ship-Building Mungo Murray 1765

Gunports - English 1750
Spaced: center to center 25X dia. of shot
Length fore & aft 6.5X dia. of shot
Height 6X dia. of shot
Sill height 3.5X dia. of shot above deck
 
The Treatise on Ship-Building Mungo Murray 1765

Gunports - English 1750
Spaced: center to center 25X dia. of shot
Length fore & aft 6.5X dia. of shot
Height 6X dia. of shot
Sill height 3.5X dia. of shot above deck
Thanks, will have to get a fascimile copy, the above fits my naval draughts. However if you view contemporary models the unlidded and lidded ports all seem the same fore & aft width?
 
I would want micrometer measured data before I accepted that.
The designers started with the size and number of guns and developed a ship design to be an artillery platform for that size.
All things being based on proportions the width should appear to be the same if photos enlarged the hull profile all to the same width.
 
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