Class History

The 18-foot Mercury is a full-keel sloop found on the West Coast of the United States. Introduced at the 1939 World's Fair in San Francisco, this Ernest Nunes design was built of a new breakthrough material—waterproof plywood! Fiberglass hulls were introduced in 1962 and aluminum spars in 1970. Competition in this family-oriented class is top notch with Nationals often won by male/female or parent/child crews. Active Mercury fleets can be found all along the west coast as well as the inland lakes and rivers, with most fleets hosting "test drive regattas" for interested parties. mercury-sailplan.gif

Boat Specifications

Length: 18 ft (5.4 m)
LWL: 13 feet (3.9 m)
Beam: 5 ft 4 in (1.6 m)
Weight less spars: 1100 lb (499 kg)
Lead Keel: 635 lb (288 kg)
Spars: 24 ft 6 in (7.5 m)
Boom: 9 ft 5 in max (2.9 m)
Sail Area: 200 sq ft (18.5 sq m)



Mercury Sailboat40 m Carbo T2 Block - 214940 mm Carbo T2 Loop Block - 214840 mm Carbo T2 Loop Block - 2148Small Swivel Cam Base - 20557 mm Carbo Ratchamatic - 2625

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Mainsheet System

The 2:1 mainsheet system uses a 57 mm Ratchamatic® on a swivel base. In light air, this load-sensing block rolls freely, automatically engaging as loads increase and releasing instantly during mark roundings and jibes.


The vang is constructed with a 3:1 cascade inside of a 5:1 purchase for a powerful 15:1 system. It is used to control the leach of the main while reaching and running, and pivots side-to-side so it's easy to cleat and uncleat.

Mercury Traveler Controls, Jib LeadsMicro Line Shedding End Stop - 2706Micro Track - 2707.2mMicro CB Traveler Track w/Control Block - 2701Micro Cheek Block - 233Micro Cheek Block - 233Micro Carbo Cam Cleat - 47116 mm In-Line Exit Block - 368Micro Thru-Deck Block - 242Cam-Matic Cam Cleat - 150Jib Lead w/Eyestrap - 450Cam-Matic Wedge Kit - 14557 mm Carbo Ratchamatic Cheek - 263329 mm Carbo T2 Block - 214612 in Dinghy Jib Lead Track - 453.12

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Jib Leads 

The lash-on T2™ block, Ratchamatic® cheek, and wedged cam, reduce friction and increase holding power for effective trimming from the wire.

Mainsheet Traveler Controls

This above/below deck system keeps the cover boards clutter free, and allows crew to trim the sail while hiking.

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