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Port Mahon

Nominal Guns20BWAS-1714
NationalityGreat Britain
OperatorRoyal Navy
Keel Laid Down17.10.1739BWAS-1714
First Commissioned15.7.1740BWAS-1714
How acquiredPurpose builtBWAS-1714
ShipyardDeptford - London BWAS-1714
Designed by
The SurveyorsBritish
Ship Builder
Service 1739-1741
John BuxtonBritish
Ship Builder
CategorySixth RateBWAS-1714
Ship TypeShipBWAS-1714
Sailing RigShip RiggedBWAS-1714


DimensionMeasurementTypeMetric EquivalentBWAS-1714
Length of Gundeck106' 4"Imperial Feet32.3257 
Length of Keel87' 5 ¼"Imperial Feet26.524 
Breadth30' 8"Imperial Feet9.3472 
Depth in Hold9' 4"Imperial Feet2.8448 
Burthen437 3494Tons BM 


26.8.1740Broadside Weight = 90 Imperial Pound ( 40.815 kg)BWAS-1714
Upper Gun Deck20 British 9-Pounder

6.1747Broadside Weight = 102 Imperial Pound ( 46.257 kg)BWAS-1714
Lower Gun Deck2 British 9-Pounder
Upper Gun Deck20 British 9-Pounder
Quarterdeck2 British 3-Pounder

Crew Complement

Date# of MenNotesSource
1733140Design Complement

15 Ship Commanders

15.7.1740 - 29.7.1741Captain
Harry PowlettBritish
Naval Sailor
Service 1733-1775
Transfered ADM 6/15/309
18.9.1741 - 4.6.1744Captain
Henry AylmerBritish
Naval Sailor
Service 1735-1744
ADM 6/15/458
5.6.1744 - 11.8.1745Captain
Thomas HarrisonBritish
Naval Sailor
Service 1711-1748
Transfered ADM 6/16/317
12.7.1745 - 11.4.1746Captain
Roger AdamsBritish
Naval Sailor
Service 1739-1746
ADM 6/16/508
ADM 6/16
12.4.1746 - 19.8.1747Captain
Andrew JelfeBritish
Naval Sailor
Service 1735-1759
Transfered ADM 6/17/87
21.8.1747 - 27.12.1748Captain
Robert AskewBritish
Naval Sailor
Service 1721-1749
ADM 6/17/260
23.1.1753 - 24.1.1754Captain
John MontaguBritish
Naval Sailor
Service 1733-1787
ADM 6/18/56
24.1.1754 - 9.4.1756Captain
Robert HughesBritish
Naval Sailor
Service 1738-1770
ADM 6/18/88
9.4.1756 - 4.4.1757Captain
Sir William TrelawnyBritish
Naval Sailor
Service 1743-1767
4.4.1757 - 8.4.1757Captain
Alexander CampbellBritish
Naval Sailor
Service 1740-1758
ADM 6/18/379
8.4.1757 - 30.9.1758Captain
Samuel WallisBritish
Naval Sailor
Service 1745-1781
ADM 6/18/383
30.9.1758 - 15.2.1759Captain
John FergusonBritish
Naval Sailor
Service 1727-1763
Transfered ADM 6/19/18
Issued by
The Hon. Edward BoscawenBritish
Naval Sailor
Ship Owner
Service 1726-1759
, North America
Confirmed 2.1.1759
ADM 6/19
30.1.1759 - 22.2.1759Commander
John HinxmanBritish
Naval Sailor
Service 1742-1761
ADM 6/19/301
Issued by
Thomas CoatesBritish
Naval Sailor
Service 1722-1762
, Jamaica - Greater Antilles
Confirmed 23.3.1761
22.2.1759 - 12.3.1762Captain
Thomas LempriereBritish
Naval Sailor
Service 1741-1762
ADM 6/19/39
12.3.1762 - 22.3.1763Captain
Richard BickertonBritish
Naval Sailor
Service 1738-1792

2 Commissioned Officers

10.6.1746 - 9.6.1747Lieutenant
John HickesBritish
Naval Sailor
Service 1740-1763
ADM 6/17/114
ADM 6/17
9.6.1747 - 27.12.1748Lieutenant
John SeldenBritish
Naval Sailor
Service 1741-1760
ADM 6/17/235
ADM 6/19

Service History

26.8.1740building at Deptford - London at a cost of £3879.0.0dBWAS-1714
26.8.1740Began fitting at Deptford Dockyard - Deptford BWAS-1714
7.9.1740Completed fitting at Deptford Dockyard - Deptford at a cost of £3002.17.9dBWAS-1714
1741In the Bay of BiscayBWAS-1714
2.1742In the Western ApproachesBWAS-1714
30.4.1742Took the Sloop
Peregrina (14) 1742-1742
Spanish 14 Gun
Unrated Sloop

9.6.1743Took the Privateer
Santa Theresa y Jesus 1743-1743
Spanish Privateer

10.5.1744Took the Privateer
Le Lion d'Or 1744-1744
French Privateer

5.1745In the ChannelBWAS-1714
2.1746Sailed to the coast of ScotlandBWAS-1714
27.3.1746Took the Privateer
Le Phelypeaux 1746-1746
French Privateer

4.1747Began small repair at Deptford Dockyard - Deptford BWAS-1714
6.1747Refitted as a 24 gun Sixth Rate Ship
6.1747Completed small repair at Deptford Dockyard - Deptford at a cost of £2889.19.3dBWAS-1714
19.7.1747Took the Privateer
Le Lévrier Volant 1746-1747
French Privateer

1748At Annapolis RoyalBWAS-1714
23.11.1748Arrived at Plymouth ADM 106

Paid off at Plymouth Dockyard

ADM 106
6.1752Began middling repair at Plymouth Dockyard - Plymouth BWAS-1714
11.1752Completed middling repair at Plymouth Dockyard - Plymouth at a cost of £2946.18.1dBWAS-1714
1.1755Sailed for VirginiaBWAS-1714
4.1756In the DownsBWAS-1714
23.4.1757Sailed for North AmericaBWAS-1714
8.1757Louisbourg Expedition
6.6.1758The Siege of Louisbourg
1759Sailed for JamaicaBWAS-1714
6.6.1762Operations against Havana

Paid off

ADM 51
29.6.1763Sold at Portsmouth for £1,150BWAS-1714


Previous comments on this page

Posted by Paul L Pace on Saturday 9th of January 2021 15:35

Extract of a Letter from Plymouth, March 12 [1756].
‘…Yesterday Morning arrived in the Sound six Sail of Transports from Cork under Convoy of the [24-gun HMS] Portmahon having on board [Lt.] General [Charles] Otway’s [35th] Regiment called the Buffs, and [Maj. Gen.] Lord John Murray’s [42nd] Regiment of Highlanders: They had a very fine Passage, being but 45 Hours from Cork to Plymouth.’

Source: Ipswich Journal, Mar. 20, 1756, p. 2.

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