Parts of a Sailing Dinghy

The hull is the main body of the boat — the watertight shell that keeps you afloat. Understanding its parts is the first step to confident sailing.

The hull can be made of fibreglass (GRP), wood, or rotomoulded plastic. Most modern training dinghies use GRP or plastic for durability.

The rig is the complete system of mast, boom, and standing rigging that supports the sails. "Spars" specifically refers to the poles — the mast and boom.

• Mast — the vertical spar that the sails are attached to. On most dinghies it passes through the deck into a mast step on the hull floor.
• Boom — the horizontal spar along the foot of the mainsail. It pivots at the gooseneck.
• Gooseneck — the universal joint connecting the boom to the mast, allowing it to swing side to side and up and down.
• Spreaders — short struts partway up the mast that hold the shrouds away from the mast, improving the angle of support.

Standing rigging holds the mast up. It does not move during sailing:

• Shrouds — wires running from the mast to the sides of the hull, preventing the mast from falling sideways.
• Forestay — a wire from the mast to the bow, preventing the mast from falling backwards. The jib is often attached along the forestay.

Sails are the engine of a dinghy. Most sailing dinghies carry two sails: the mainsail and the jib (or genoa, if it overlaps the mast).

Every sail has three edges and three corners:

Battens are semi-rigid strips inserted into pockets along the leech to support the sail shape and prevent flapping. Telltales are short ribbons on both sides of the sail that show airflow — when both stream aft evenly, the sail is trimmed correctly.

"Foils" refers to the underwater appendages that provide lateral resistance and directional control. Without them, the wind would simply blow the boat sideways.

• Centreboard — a pivoting board lowered through the centreboard case. It resists sideways drift (leeway). A daggerboard is similar but slides vertically rather than pivoting.
• Rudder — the vertical foil at the stern used for steering. It hangs from the transom on pintles (pins on the rudder) and gudgeons (sockets on the transom).
• Tiller — the lever attached to the top of the rudder blade, used to turn it.
• Tiller extension — a jointed stick on the end of the tiller that lets the helm steer while sitting out or moving around the boat.

Pintles and gudgeons: These are the hinge fittings. The pintles (the pins) are on the rudder; the gudgeons (the sockets) are on the transom. The rudder drops onto the transom so pintles slot into gudgeons.

Lines (ropes) and fittings are the control system of the boat. Once a rope has a job on a boat, it earns a name:

Fittings guide and secure lines:

• Cleat — a fitting that grips a line to hold it in place. Cam cleats grip automatically; clam cleats have V-shaped jaws.
• Block — a pulley. Blocks reduce the force needed to pull a line and change the direction of pull.
• Fairlead — a guide (ring or slot) that directs a line at the correct angle to a cleat or block.