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4 ■ Chapter 1 Jet Drives ◆ Jet drives propel a vessel by forcing a jet of water out the back of the vessel. Directing this jet of water steers the vessel. ◆ Personal watercraft are the most common type of vessels that use a jet drive. ◆ Jet drives also may power larger vessels (jet boats) and are used commonly for vessels designed for shallow water conditions. Jet boats can have inboard or outboard jet drives. Personal Watercraft ◆ A PWC is a small vessel that uses an inboard jet drive as its primary source of propulsion and is designed to be operated by a person or persons sitting, standing, or kneeling on the vessel rather than inside the vessel. The U.S. Coast Guard includes personal watercraft in the group of inboard vessels less than 16 feet in length. ◆ PWCs are subject to all of the same laws and requirements of any other vessel plus a few laws specific to PWCs. See Chapter 4 for the legal requirements for PWCs. Sailboats Use of the wind is one of the oldest forms of powering a vessel. Sailboats range in size and complexity, but all have basically the same four components. ◆ The hull carries the passengers and supports the rigging. ◆ The rigging includes many parts of the sailboat, such as the lines ( sheets and halyards), mainsail, headsail (jib), boom, and mast. ◆ The keel or centerboard is attached to the bottom of the hull and keeps the boat from sliding sideways through the water. ◆ The rudder is used to steer the sailboat, turned by a tiller or steering wheel. halyards Lines (ropes) used to raise and lower the sails sheets Lines (ropes) used to control the angle of the sails to the wind impeller Device used to pump and force water under pressure through a steering nozzle at the rear of the vessel rudder keel mainsail halyards hull sheets boom headsail (jib) mast steering control: Means of controlling the steering nozzle starboard: Right side of a vessel port: Left side of a vessel safety lanyard: Short cord for attaching the ignition safety switch to the operator's wrist or personal flotation device (life jacket) impeller drive shaft jet pump intake grate bow: Front of a vessel stern: Rear of a vessel steering nozzle Jet drives use an engine to power a strong water pump, which sucks up water and then forces the water out the back to thrust the vessel forward. Outboard Jet Jet Impeller Intake Inboard Jet Jet Impeller Intake Jet Drive draft throttle lever fuel cap Copyright © 2014 Boat Ed, www.boat-ed.com