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YFN - Steel Covered Lighter

YFN is a non-self-propelled, shore dependent, steel covered lighter, 110 foot long with 32 foot beam and designed to carry cargo requiring protection from the weather in harbors, rivers or other protected waters. The craft is designed to carry a distributed load of 550 long tons on its main deck within the deckhouse structure.

Building specifications - Specifications for Building covered lighter YFN (non self-propelled) dated 30 Apr 1962


NOTE: Size varies between Classes.





Depth (molded) to main deck centerline


Draft light


Draft full


Displacement, light

135 tons

Displacement, full

685 tons


550 tons


Anchor - 500 lb light-weight type

Anchor davit - portable, 600 lb capacity

Anchor winch - hand operated double gypsy

Two slings for use in handling panels during erection process

Anchor cable - 50 fathoms of 5/8" diameter 6 x 37 galvanized IIGPS wire rope with one end fitted with 3/4" bending shackle and a 5/8" closed type wire rope socket. The other end is seized.

Two nylon lines - 4" circumference, 10 fathoms for mooring and warping.

Ten portable rope fenders


Hull - Hull is designed on a system of framing

Hull is divided into six watertight buoyancy tanks by five watertight transverse bulkheads

Rake ends bow and stern are reinforced by four longitudinal truss sections each end to permit craft to be towed at sea.

Deckhouse - The deckhouse is a 92 ft long by 27 ft wide demountable type structure made up of 35 side panels and roof panels bolted together. Deckhouse sides are bolted to a coaming which in turn is welded to the main deck. The deckhouse contains two rolling cargo doors on each side, one rolling door aft end and one service door forward end. The deckhouse structure is weathertight except the forward end which is watertight.

There are four cargo hatch ways in the roof that permit a continuous opening with the corresponding sliding side doors when the header is removed. One additional hatchway is located centrally in the deckhouse roof. The roof hatchway covers are made up of a series of 12" wide channels spanning the width of the opening. Hatch covers are made watertight by means of canvas covering.

A ramp is provided in way of each rolling side door to facilitate cargo handling by a wheeled vehicle.

Anchor Handling - Craft is equipped with a manually operated anchor handling system consisting of hand operated double gypsy windlass portable davit, anchor cable, and block and tackle, Anchor cable drum is declutchable to permit use of gypsy head for mooring and warping.


There are two life rings stowed in brackets on outside of deckhouse, one at each end.

Pipe railings (grip rod) are fastened to and extend along two sides of deckhouse structure except that removable chain is provided at rolling side doors.


There is no electrical generating power on board. Four 200-watt floodlights for lighting deckhouse interior are energized from shore power by way of installed shore connection box. Disconnect sockets are provided to permit dismantling of deckhouse structure without disturbing installed wiring.

Portable navigating lights are carried on a portable tee mast at the stern end of the deckhouse roof. Side lights are mounted on the side of the deckhouse.


Chocks, bitts, and cleats are provided for mooring, warping and towing. Access to buoyancy tanks is via bolted man holes and vertical ladders. Access to deckhouse roof is via two exterior ladders, one on each side of deckhouse. Wood fenders are provided as follows: two each side of hull; one each end of hull. Ten portable rope fenders are provided and stowed on brackets in forward rake compartment and hung from cleats over side of barge when needed. Two nylon lines are provided for warping and mooring and are stowed on brackets in forward rake end compartments.

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Page last modified: 07-07-2011 13:01:24 ZULU