Deck machinery and ground tackle

46 CFR §111.25-15

§ 111.25-15 -15 Duty cycle. Each motor must be rated for continuous duty, except a motor for an application listed in Table 111.25-15 or a similar duty must meet the minimum short-time rating stated in the table. Table 111.25-15 Application of motor | Minimum short-time rating of motor, in hours Deck winch and direct acting capstan | Half. Deck winch with hydraulic transmission | Continuous at no load followed by⁄hr. at full load. Direct acting windlass | One fourth. Windlass with hydraulic transmission | Half hour idle pump operation, followed by⁄hr. full load operation. Steering gear, direct acting | One. Steering gear, indirect drive | Continuous operation at 15 pct. load followed by 1 hr. at full load. Watertight door operators | ⁄. Boat winches | ⁄.

NAVEDTRA 14067 §4-3

NAVEDTRA 14067 §4-3 — Ground tackle and anchoring from the deck Ground tackle is the anchor, chain, and associated gear a ship uses to anchor. On the forecastle the chain leads from the chain locker up through the spurling pipe, over the wildcat of the anchor windlass, through the hawsepipe, and out to the stockless anchor stowed in the hawsepipe. Holding the anchor and chain when not heaving are the brake on the wildcat and, more securely, a chain stopper — a pelican hook or riding pawl that takes the strain off the windlass while the ship rides to her anchor. Anchor chain is made up in shots (15 fathoms, 90 feet, each), joined by detachable links, and marked by a paint-and-wire color code at each shot so the crew can call how much chain is out as it runs. Anchoring: with the anchor walk…

NAVEDTRA 14343 §4-1

NAVEDTRA 14343 §4-1 — Ground tackle components — anchors, chain, and appendages Ground tackle is the equipment used in anchoring and mooring: the anchor, anchor chain (cable), connecting fittings, and the machinery that handles them. The stockless anchor is standard on most vessels because its crown and pivoting flukes let it stow snugly in the hawsepipe. When the anchor is let go and the ship drags astern, the flukes trip downward and dig into the bottom; holding power comes from the flukes biting the ground, not from the anchor's weight alone. Older patterns include the old-fashioned (stock) anchor and the lightweight (Danforth) type with large pivoting flukes and high holding-power-to-weight ratio. Anchor chain is measured in shots, each shot being 15 fathoms (90 feet). Shots are joine…

NAVEDTRA 14343 §4-3

NAVEDTRA 14343 §4-3 — Anchor windlass and wildcat operation (deck machinery) The anchor windlass is the deck machine that heaves in and pays out the anchor chain and holds the anchor at the hawsepipe. Its principal parts are the wildcat (a notched, sprocket-like drum whose pockets, or whelps, are shaped to grip each link of chain), the wildcat clutch (or locking head) that connects the wildcat to the drive shaft, the brake band that controls the wildcat when it is declutched, and the prime mover (electric, hydraulic, or steam). Most windlasses also carry gypsy heads (warping heads) on the shaft ends for handling mooring lines. To let go the anchor: with the wildcat declutched and the brake holding, the riding pawl or devil's claw and any chain stopper are removed, then the brake is eased …

NAVEDTRA 14343 §4-4

NAVEDTRA 14343 §4-4 — Anchoring procedures and weighing anchor Before anchoring, the ground tackle is made ready: the chain stopper is cleared, the brake is set, the wildcat is walked out to place the anchor just clear of the hawsepipe ("at the waterline" or "underfoot"), and the bridge is told the anchor is ready to let go. The vessel is maneuvered to take the way off her so she is nearly stopped or has a slight sternway at the chosen spot; letting go with too much headway can cause the chain to run out too fast and part, or drag the anchor. On the order "let go the anchor," the brake is released and the anchor drops; the officer on the forecastle reports the number of shots on deck or in the water and the direction the chain is leading (relative to the ship) and its tension. As the ship…

NAVEDTRA 14343 §8-2

NAVEDTRA 14343 §8-2 — Blocks and tackle — mechanical advantage A block is a pulley in a frame; a tackle (pronounced "taykle") is an assembly of blocks and rope (the fall) used to gain a mechanical advantage or to change the direction of pull. A block's parts are the shell (frame), the sheave (grooved wheel), the pin (axle), and the strap or hook/shackle by which it is secured; a swallow admits the rope and the becket is a fixed eye for making the standing part fast. The theoretical mechanical advantage of a tackle equals the number of parts of the fall supporting the moving (load) block. A single whip (one fixed block) gives no advantage, only a change of direction; a gun tackle (two single blocks) gives an advantage of two or three depending on which block moves; a luff tackle (a double …