Home Port; on the Delaware River at Fox Grove Marina Essington PA.

2016-2017 Work

Gaff Rig with headsail on Sprit


The Delaware Bay oyster boats had two masts. 

Two masts with gaff rig and headsail on sprit. 

Single mast triangular sail with headsail on sprit.

The boom extending beyond the stern on the oyster boats would be let out to almost 25 deg to wind direction to create a large airfoil, or let out in line with wind direction to stall the boat while working over an oyster reef, usually with wind on beam and crew working with oyster rakes off the windward side.

The advantage of a gaff apart from lower center of effort is the smoother lower friction raising and lowering of the sail, and it just looks good.

At least one Delaware Bay Oyster boat owned by the state of New Jersey sails the bay, and a fleet of Chesapeake Skipjacks race throughout the summer on the Chesapeake Bay.

The boom will be 14ft (4.27m) long and will have some characteristics of a Skipjack the 19th century single mast oyster boats of the Chesapeake. 

I will be adding a boom break to slow gibes, a yard vang to control sail twist, and a boom vang to produce a flat sail for pointing to wind, or ease the boom vang for a baggy sail for running with the wind. 

Sail shape control with yard and boom vang is probably the only real advantage over the junk rig. Though a true junk rig with main-sheatlets from each batten can have a very refined control of sail shape.

Not yet resolved; sailtrack on mast or hoops around mast. Hoops are more traditional but sailtrack offers a cleaner look.

Not yet resolved; boom gooseneck on mast or on dutch tabernacle. On mast provides for more boom head clearance in cockpit. On tabernacle provides for boom to remain attached to gooseneck when mast is lowered.



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Ulladh pronounced "ul-la" (null lad).

Uladh the gaelic spelling for the territory of the U-Nail chieftains in the ancient Irish province of Ulster (English/Norse), originally the counties of Down and Antrim, but now including Derry, Armagh, Tyrone, Fermanagh, Donegal, Cavan and Monaghan, also referred to as Ulidia (Greek/Roman),.

Uladh was the home of a pre-celtic, cruithne (crew-en-ya) pictish tribe, who may have been descendants of prehistoric tribes indigenous to the British Isles since the retreat of the last ice age.

Archeological finds date first inhabitants to about 6,000 BC and trade goods from Rathlin Island, County Antrim off the northeast coast of Ireland made from porcellanite stone appearing in Egypt and Crete by 2,500 BC.

The early tribes of Ireland where displaced by later waves of migrants from mainland Europe; about 1700 BC by bronze age tribes, celtic tribes about 500 BC, and in the past two millenia; Roman trading posts, Viking settlements, English plantations... and in the 21st century a welcome increasing diversity from the European Union and the world.

SV Ulladh (for vhf clarity I use "sailing vessel ul-la") is named for the territory of the first peoples to settle in Ireland after the retreat of the last ice age.


Since 1949 Fisksatra Varv in the coastal town of Fisksatra Sweden, built fiberglass boats from dinghies to a 300 ton minesweeper for the Swedish Navy.

The Havsfidra 20's were built between 1968 and the late 1970's to Swedish Navy and Lloyd's certification standards.

The Havsfidra 20 and a larger version the Storfidra 26 where sold in the United States by Continental Yachts and Trawler Agency of Atlantic City NJ.

Havsfidra; sea-feather?
(fidra; to touch or tickle with a feather -Icelandic-English Dictionary, Clarendon Press 1874)