Rescue boat handling lrg

Grunt Productions 2007

BOAT HANDLINGBOAT HANDLING

A brief by Lance A brief by Lance GrindleyGrindley


Boat HandlingBoat Handling


Boat HandlingBoat Handling

1. Discovering the relationship between the laws of physics and boat behavior can be perplexing.

2. No two boats respond the same, even under identical circumstances.

3. Successful boat handling requires Practice, Practice and More Practice.


HelmsmanshipHelmsmanship

1. It cannot be mastered from a book or in a classroom.

2. It involves your “reaction - response” to the entire boat and its total environment including the weather.

3. You must attain the basics of “performance” from “hands on” experience in order to fully understand and master the “helm”.


Secrets of Good Secrets of Good HelmsmanshipHelmsmanship

1. KNOW YOUR BOAT

2. Take it easy on another boat, until you “get the feel” and KNOW THEIR BOAT

3. Practice, practice and practice some more.


TerminologyTerminology


Terminology 1Terminology 1

1. INBOARD: Engine mounted within the hull. Fixed directions of thrust ahead and astern. Steering generally uses rudder

2. OUTBOARD: Engine mounted on the transom and detachable.Thrusts ahead and astern, but whole engine can be moved to steer.

3. I/O: Combination of inboard and outboard.

4. THRUST: Force moving the boat through the water, gained by a propeller or water jet.



1. PROPELLER: A “screw” which, when rotating. draws in water from ahead and pushes it out astern.

2. WATER JET: A screw inside a housing that sucks water from under the vessel, and pushes water out of a nozzle on the transom to propel. Steering is achieved by turning the nozzle, slowing or going astern is by moving a bucket down in front of the nozzle to redirect the flow.



1. SINGLE SCREW: Boat with one propeller.

2. TWIN SCREW: Boat with two propellers.



1. STEERING: Accomplished by changing direction of thrust, whether by:

1 using rudder on inboard engine.

2.changing direction of propeller thrust on outboards or inboard/outboards.

3.changing direction of nozzles and buckets on water jets.



• PORT - left side of the boat looking forward.

• STARBOARD - right side of the boat looking forward.

• REMEMBER: PORT and STARBOARD sides are fixed, no matter which heading you have.



1. MAKING HEADWAY: Going forward in the water

2. MAKING STERNWAY: When backing down.

3. TURNING TO PORT: Bow is moving to the left.

4. TURNING TO STARBOARD: The bow moves to the right.



1. RIGHT HAND PROPELLER: Screws through the water in a clockwise rotation, looking at the transom from the stern.

2. LEFT HAND PROPELLER: Screws through the water in an anti-clockwise rotation, looking from aft.

3. Most single engine boats have RIGHT HAND props on them.



1. TWIN ENGINED: Usually have counter-rotating props to offset torque with RIGHT HAND propeller on starboard side, LEFT HAND propeller on port side.


Suction Screw CurrentSuction Screw Current

1. SUCTION: Incoming water current FROM forward of the propeller

2. DISCHARGE: Outgoing current aft of the propeller

3. RUDDER(S) are placed in the center of the DISCHARGE flow and the current of water rushing by produces a pressure on the rudder blade which controls the direction of the boat moving in the water.


Suction Screw CurrentSuction Screw Current

1. NOTE: RUDDER(S) are ONLY EFFECTIVE, when the boat moves through the water.



PropellersPropellers

1. RIGHT-HANDED: View from stern. Propeller is turning CLOCKWISE (NOTE OUTSIDE TIP AT TOP)

2. LEFT-HANDED: Turning COUNTER-CLOCKWISE.



Transverse ThrustTransverse Thrust

•When moving forward:

RIGHT HAND propellers produce greater thrust to starboard at the stern

and

LEFT HAND propellers produce greater thrust to port at the stern.

•All propellers rely on smooth flow of water for max efficiency.



•When moving astern:

RIGHT HAND propellers produce greater thrust to port at the stern

and

LEFT HAND propellers produce greater thrust to starboard at the stern.

This fact can be used in maneuvering on and off docks,


Transverse ThrustTransverse Thrust1. This called transverse thrust or the paddle

wheel effect.



1. In a right handed propeller, moving ahead, torque will move the stern to the right.

2. Visualize the direction of movement of the top of the prop for direction of movement of stern.


Transverse Thrust

Green spot is centre of rotation for this maneuver



1. This transverse thrust may be used to best effect when docking, to bring the stern alongside.


Handling CharacteristicsHandling Characteristics

1. HEAVY BUILT: Displacement, load carrying hulls. Stable. Slower.

2. LIGHTER BUILT: Planing; Sport hulls. Shallower draft. Much faster. Less stable.

3. BOTH: Handle completely differently, especially in heavy weather

4. PLANING hulls revert to displacement hulls at low speeds.


HandlingHandling

1. ALL HULLS are affected by WIND and CURRENT.

2. HIGH BOWS: Tend to fall off the wind NO MATTER what is done to prevent it, especially at low speeds.

3. CURRENT: Biggest reaction factor in all hull types.

4. DISPLACEMENT HULL: Current greatest affecting factor


HandlingHandling

1. The more structure above the water, the more effect from wind.

2. The deeper the draft, the more effect from current.

3. Effect of current is greater than effect of wind on displacement hulls.

4. Effect of wind greater than current on planing hulls.


Mooring LinesMooring Lines

1. BOW LINE: Stops the bow from moving aft

2. BOW BREAST: Stops the bow from moving outward from the dock.

3. AFTER BOW SPRING: Stops the boat from moving forward

4. FOREWARD QUARTER SPRING: Stops the boat from moving back


Mooring LinesMooring Lines

1.1. AFTER BREAST: Stops the stern from AFTER BREAST: Stops the stern from moving out from the dockmoving out from the dock

2.2. STERN LINE: Stops the stern from STERN LINE: Stops the stern from moving forwardmoving forward



Maneuvering On/Off DocksManeuvering On/Off Docks


Springing or Warping onto Springing or Warping onto a Dock 1a Dock 1

1.1. To get alongside starboard to, bend a To get alongside starboard to, bend a mooring line to a bow cleat. When close mooring line to a bow cleat. When close to the dock, pass it to a person on the to the dock, pass it to a person on the dock from the starboard bow to secure it dock from the starboard bow to secure it to a cleat or bit on the dock.to a cleat or bit on the dock.

2.2. Shorten the line on the boat side to suit Shorten the line on the boat side to suit and cleat it off.and cleat it off.

3.3. Put the rudder to PORT and give the Put the rudder to PORT and give the engine moderate power AHEAD.engine moderate power AHEAD.


Springing or Warping onto Springing or Warping onto a Dock 2a Dock 2

1. The left rudder will swing the bow out.

2. The power will move the boat ahead until it is stopped by the mooring line

3. The shortened mooring line will force the hull into the dock and stop it’s forward motion.


Take It...


Without Wind Or CurrentWithout Wind Or Current

Approach the dock at a very slight angle Approach the dock at a very slight angle (10 to 20 degrees)(10 to 20 degrees)

When the bow is close to dock, shift into When the bow is close to dock, shift into reverse to slow headwayreverse to slow headway

Ease into the landingEase into the landing



Wind or Current off Wind or Current off DockDock

Approach the dock slowly at a fairly Approach the dock slowly at a fairly sharp angle (about 45 degrees)sharp angle (about 45 degrees)

At the dock, shift into neutral and At the dock, shift into neutral and secure a bow linesecure a bow line

Turn hard in the direction away from Turn hard in the direction away from the dockthe dock

Slowly go forward against the bow lineSlowly go forward against the bow line The stern will move toward the dockThe stern will move toward the dock



Into the Wind or CurrentInto the Wind or Current

Approach the dock at a slight angleApproach the dock at a slight angle

(20 to 30 degrees) (20 to 30 degrees) When the boat is close to the dock, turn When the boat is close to the dock, turn

the boat so that it is parallel to the dockthe boat so that it is parallel to the dock Put the bow line over firstPut the bow line over first The stern will then swing into the dockThe stern will then swing into the dock



With Wind or Current With Wind or Current AsternAstern

Approach the dock at a slight angleApproach the dock at a slight angle When the bow is close, use reverse to When the bow is close, use reverse to

slow headwayslow headway Make fast the stern lineMake fast the stern line Make fast the bowlineMake fast the bowline THIS APPROACH IS VERY DIFFICULT THIS APPROACH IS VERY DIFFICULT

AND SHOULD BE AVOIDEDAND SHOULD BE AVOIDED Be ready to use reverse gear at all Be ready to use reverse gear at all

timestimes


Try to avoid if possible


Wind or Current on to the Wind or Current on to the DockDock

Approach parallel to the dockApproach parallel to the dock Shift into neutralShift into neutral Let the wind and the current carry Let the wind and the current carry

the boat into the dockthe boat into the dock



Springing Or Warping Out Springing Or Warping Out 11

Port Side ToPort Side To

1. Let go all lines except short forward spring, well cleated.

2. Port rudder to swing the stern away from the dock.

3. Low power to move the boat’s stern out from the dock.


Springing Or Warping Out Springing Or Warping Out 22

Port Side ToPort Side To

4. Short spring will stop the outward motion, and swing the hull on the forward cleat to a position bringing the stern off the dock.

5. Let go the forward spring line.

6. Go astern to depart the dock.



Turning Around 1Turning Around 1

1. The vessel can be turned around in a confined space by using transverse thrust to its maximum.

2. The sticks can be split, one engine going ahead, the other astern.


Turning Around 2Turning Around 2

3. The vessel will start turning around the centre of rotation.

4. There can be drift ahead or astern, which may be minimized by increasing the rpm on the astern engine or ahead engine respectively.


Turning Around

Green spot is centre of rotation for this maneuver


Now….Now….

1. Go out and practice, on your own vessel


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Rescue boat handling lrg