KB Skipper Class # 2

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# KB Skipper Class # 2 - PowerPoint PPT Presentation

KB Skipper Class # 2 Today’s class: It’s a motor, not an engine Charts and Navigation aids Trip planning Hull Speed Hull Speed = 1.34 * SqRt (LWL) LWL = length at water line Charlotte 21.75 = 6.25 knots Rascal 21.75 = 6.25 knots

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Presentation Transcript
KB Skipper Class # 2
• Today’s class:
• It’s a motor, not an engine
• Trip planning
Hull Speed

Hull Speed = 1.34 * SqRt (LWL)

LWL = length at water line

Charlotte 21.75 = 6.25 knots

Rascal 21.75 = 6.25 knots

Platypus 22.0 = 6.29 knots

Perspicacious 22.25 = 6.32 knots

Passport 40 Sloop, lwl 33.5 = 7.76 knots

Jeanneau 52 sloop lwl 41.67 = 8.65 knots

850 ft Freighter = 37 knots *

Wave of Translation

The velocity of a wave is equal to its wavelength times its frequency.

With frequency constant, increase the wavelength and you increase the velocity.

How long would it take a container ship to go from barely visible (Edmonds) to right on top of you (Shilshole)?

1.34 * Sq Rt (LWL) 12 Nautical Miles / 37 knots = .32 hours = 20 minutes1.34 * SqRt ( 850)1.34 * 28.3 = 37 knots

18 knots = 40 minutes

ZIM Djibouti

Ferries are Fast

30 minutes from dock to dock.

17 Knots mid channel

MV Tacoma

100-yard moving security zone

Electrolysis

Corrosion in marine environments occurs when two (or more) dissimilar metals are brought into electrical contact under water.

### Sacrificial Zinc Anode

Mount on propeller shaft

Prop Shaft Zinc Anode
• Electrical contact is essential –
• Metal to metal.
Inboard Engines
• Sacrificial zinc needed in cooling system.
• Salt water acts as electrolyte
Damn outboard motors ……

Sweet inboard engines

Changing the Shear Pin

Exercise: Using outboard motors in the shop, have everyone change out a sheer pin. Go over various engine systems.

### All buoys float

Red buoys have even numbers.

Can Nun

Flat Top Pointed Top

Red on right, when you return from the sea

Day Marks

Red = triangleGreen = square

NOAA Chart #1

Our #3 Buoy looks like this

Phase Characteristics of lighted buoys
• Fixed
• Flashing
• Quick Flashing
• Alternating

Tortilla Flats

Run aground here

Eagle Harbor- all lit up!
• Decatur Reef R “2” fl R 6s
• Blakely Rock fl 4 s 16ft 5M
• Tyee Shoal Fl (2+1) R 6s 15ft 5 MHORN (bl 15s)
• R N “2”
• Fl G 6s 30 ft 4M “1”
• Fl G 2.5s 15ft 5 M “3” 1Bell
• Fl R 4s 15ft 4M “4”
• Fl G 4s “5”
Equally spaced0 to 90 degrees60 Minutes to each degree60 seconds to each minuteEach minute is one nautical mile

5400 Nautical miles from equator to the pole

Latitude: 47° 41′ 57.23″ NLongitude: 122° 31′ 47.25″ W

The WAC Latitude: 47° 38′ 55.18″ NLongitude: 122° 17′ 55.08″ W

Charts
• Feet or meters or fathoms
• Chart number
• Mean Lower Low Water – depth references
• Compass Rose
• Special areas – traffic lanes, restricted areas
• Scale: 1:8,0000 is large
• 1:40,000 better
• 1:8000 harbor chart
Lake Washington ship Canal

Burlington Northern Bridge Clearance 43 feet (13.11 m) at high tide (mean high water of an approximate 10-foot/3.05-m tide)Ballard Bridge Clearance 44 feet (13.72 m) at center span at mean regulated lake level.  Closed weekdays 7 - 9 a.m. and 4 - 6 p.m.,Fremont Bridge Clearance 30 feet (9.14 m) at center span at mean regulated lake level.  Closed weekdays 7 - 9 a.m. and 4 - 6 p.m., University Bridge Clearance 42 feet 6 inches at center span at mean regulated lake level.   Closed weekdays 7 - 9 a.m. and 4 - 6 p.m., Montlake Bridge Clearance 46 feet (14.02 m) at center span at mean regulated lake level.  May - August, Closed weekdays 7 - 9 a.m. and 3:30 - 6:30 p.m.  September - April, Closed weekdays 7 - 10 a.m. and 3:30 - 7 p.m.,

Exercise

Morris Code Mo

List all nav aids transiting ship canal from Puget Sound to Lake Union

Ballard Locks – 4 knot speed limit
• Waiting for the locks
• Fenders on both sides
• 50 ft. lock lines ready
• Tie to bulkhead or not
• Practice the lasso
• Do not get off the boat
• Red light = no Green light = ready for boats to enter
• Large boats first
• Listen for announcement
• Large Locks
• If you are on the wall, how to handle the 50 ft lock lines
• Do not tie across to a boat on the other side.
• You will most likely be rafting up to a larger boat.
• Small Locks
• The attendant will tell you what number bollard to take.
• Floating bollards – practice the lasso
• In the locks
• Fend off carefully – do not risk hands or feet to injury
• Lake line secured first
• Run line to cleat on boat you raft too then back – so you control the release
• Cleat all lines
• Watch sailboat mast locations.
• Keep crew from rocking the boat.
• Exiting the locks
• Start engine before lock opens
• Pay attention to lock attendant
• Remove lake line last.
• With current, boat must have way on her for rudder to bite.
• If out of control, do not injure crew, boat will flush out of locks on her own.
• Get out of the way of other boats coming out of the locks
Hiram M. Chittenden Locks

LakeLineLast

Locks 1Locks 1Locks 1Locks 1

Shilshole
• Shilshole Marina
• Pump out and Gas dock locations
• Range markers for approaching channel in the dark.
• Nun buoys and shallow water hazards in the area.
• Get out of the channel before raising/lowering sails
Trip Planning

Exercise: Drag out the charts, arrange on floor from Olympia to Gulf Islands and talk about destinations.