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| CHAPTER 1 - INTRODUCTION |
| Motors/Boat Hull Types/Terminology |
| MOTORS
Four primary types of motors are found on boats – outboard, inboard/outboard,
inboard, and jet. They all have advantages and disadvantages.
Outboard motors vary greatly in size and
clamp onto the transom. The whole motor pivots on its mounting to aim the wash and steer the boat. The
boat turns in the opposite direction the tiller arm is pushed. Electric motors are outboards. The inboard/outboard motor is bolted inboard at the stern with the drive unit through the transom. The inboard is mounted lower in the
boat and farther forward than an inboard/outboard. A rudder is used to steer. Jet motors use an engine to pump water
through a nozzle at the stern, which pivots to steer the boat.
Remember, when boating in new areas, certain lakes in
the state have specific motor size limitations. |
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| BOAT HULL TYPES
There are two basic types of boat hulls. Planing hulls are flat-bottomed and skim across the water. Displacement
hulls have round bottoms and plow through the water. They are more stable, but not as fast as planing hull boats.Most
boats are a compromise between planing and displacement hulls (deep-V, modified-V, cathedral, etc.). There are also
multiple-hulled boats such as catamarans and pontoons. |
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TERMINOLOGY
Aft - near or at the stern of the boat.
Beam - the width of a boat,
also the direction at right angles to the centerline of a vessel.
Bilge - the lowest point of a boat’s interior
hull.
Bow - the forward part (toward the front) of a boat.
Draft - the vertical distance from the waterline
to the lowest point of the keel; the minimum depth of water in which a vessel will float.
Forward -
aboard a boat, the direction to the front, to the bow.
Freeboard - the vertical distance from the waterline
to the gunwale.
Gunwale - the upper edge of the side of a boat.
Hull - the structural body of the boat;
does not include superstructure, masts or rigging.
Keel - the main structural member of a boat; its backbone; the lateral
area beneath the hull that helps to provide stability and reduce the sideways drift of a boat.
PFD - personal flotation
device (life jacket, vest, preserver).
Port - the left side of the boat.
Starboard - the right side of the boat.
Stern - the after (back or rear) portion of the boat.
Transom - the transverse part of the stern (where an
outboard motor is attached).
Waterline - the intersection of a boat’s hull and the water’s surface.
USCG - the United States
Coast Guard.
USPS - the United States Power Squadrons. |
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