9 Terms for Laymen
Planing Hull - A hull designed to ride across the top of the water, rather than plow through it (as does a displacement hull like a pontoon).
Stepped Hull - A hull with a trough that runs from the outer chine all the way to the keel, creating separate forward and aft surfaces. The junction of the two appears as a stair step.
Tri-Hull - A V-hull with two additional outside hulls; also called gull-wing hull. This might be found in a deck boat or catamaran.
V-Hull - A boat with a pointed bow and V-shaped bottom, at least in its forward section, for cutting through the water and softening the ride.
Chine - Where the side of the boat transitions to the bottom of the boat, creating a corner. The sharper the corner, the "harder" the chine and the stronger the bite in turns.
Reverse Chine - A two-corner chine; before the bottom meets the side, it forms an upside-down V-shape to deflect spray away from the boat.
Keel - The centerline, or spine, of a boat. The sharper the keel's angle (deadrise), the softer the ride -- though sometimes at a cost in speed.
Pad - A flat or nearly flat area on the running surface toward the back of the boat.
Strakes - Horizontal or nearly horizontal lengthwise surfaces that help lift the boat onto plane.