AUXSEACH 2 by N6Tc7ce

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									Chapter 2




BOAT MAINTENANCE
      HAULING OUT
• PROPER BLOCKING
        BOAT LAYUP TASKS



•   CLEAN BOTTOM
•   DRAIN ALL TANKS & BILGE
•   FILL FUEL TANKS - TREAT
•   CHANGE ENGINE OIL
         •   REMOVE BATTERY &
             PERISHABLES
         •   CLEAN HEAD & HOLDING TANK
         •   REMOVE CLOTHES, BEDDING,
             PFD’S, ETC
         •   WASH WITH FRESH WATER
         •   VENTILATE BOAT


4/2010                                   4
   •     BOTTOM PAINT
         – CHEMICALLY SLOW DOWN -
           PREVENT VEGETABLE GROWTH AND
           MARINE ANIMAL LIFE
   •     MATCH PAINT TO BOAT
         MATERIALS
   •     ENVIRONMENTAL
         CONSIDERATIONS

4/2010              Ted Potter DCAPT/SHR   5
                        BOTTOM

The PROBLEM: BOTTOMS BECOME FOULED
          BY MARINE GROWTH.
        TWO FORMS OF MARINE LIFE
1. VEGETABLE: GRASSES, WEEDS, ALGAE &
   FUNGI; Congregate around waterline but may cover
   entire bottom.
2. ANIMAL : WORMS, BORERS, SHELL FISH,
   BARNACLES.
     EFFECTS OF BOTTOM FOULING



1. SLOWS HULL SPEEDS
2. INCREASES FUEL CONSUMPTION
3. INTERFERS WITH MANEUVERABILITY
4. REDUCES OVERALL EFFICIENCY OF THE
   VESSEL
     EFFECTS OF BOTTOM FOULING


1. ACCUMULATIONS OF BARNACLES OR
   OYSTERS MAY MANDATE GRINDING DOWN
   OF THE HULL.
2. VERY EXPENSIVE, EVEN IF POSSIBLE.
3. ACCUMULATIONS OF ONLY A FEW WORMS IN
   A WOOD HULL CAN BE DEVASTATING.

4. ALL OTHER HULL MATERIALS ARE
   IMPERVIOUS TO BORERS / WORMS.
 MODERN DAY BOTTOM PAINTS



   TWO IMPORTANT ELEMENTS
              COPPER
              MERCURY
Very effective in preventing fouling by
maintaining antiseptic film over the boat
                  bottom
     Disadvantages Of Bottom Paint


1. GALVANIC ACTION (ELECTRONIC
   CORROSION) : CAUSED BY METALLIC PAINT
   SALTS; MERCURY / COPPER.
2. AFFECTS ALL ELECTRONICS AND THEIR
   PERFORMANCE.
3. DESTROYS METALLIC OBJECTS SUCH AS
   PROPELLERS, SHAFTS, RUDDER BLADES,
   STRUTS, ETC.
       Disadvantages Of Bottom Paints



4. ZINCS (NEVER PAINTED)must be properly
attached to each component part to combat
GALVANIC ACTION.
5. GREAT CARE MUST BE TAKEN TO
PROPERLY MATCH THE PAINT TO YOUR
BOAT’S NEEDS.
6. PAINT MANUFACTURERS HAVE
DEVELOPED REASONABLE SOLUTIONS.
                            DRY ROT

1. WOOD: Anywhere…and WOODEN BOATS in particular.
2. Comes and goes, almost at random.
3. GREAT MISNOMER: Dry Rot ONLY occurs in the
   presence of FRESH WATER MOISTURE
4. CAUSE: A FUNGUS
5. Salt water seems to discourage the fungus but will NOT
   cure it.
             DRY ROT - DETECTION


1. Distinctively BAD ODOR. Once detected, never
   forgotten.
2. Look in dark places; in the bilge; along the garboard
   strake; floor boards; all frames; any-where two pieces
   of wood touch each other.
3. VISIBLE EVIDENCE: Spongy spots in the wood;
   whitish powder, weaknesses in wood surface.
            DRY ROT - REMOVAL
1. PROBE with knife or pick to discover it.
2. REMOVE ALL OF IT, IMMEDIATELY! The
   fungus spreads like wildfire.
3. CUT IT OUT with a knife including some of the
   good wood, just to make certain you get it all.
4. Treating it is NOT enough.
          DRY ROT - PROTECTION


1. There are some reliable treatments on the
   market and more are appearing.
2. BEST PROTECTION: Keep fresh water,
   including condensation, OUT OF YOUR BOAT!
3. Keep the boat WELL VENTILATED and DRY!
            GALVANIC ACTION



1. AN ELECTRO-CHEMICAL PROCESS
   whereby an ELECTRICAL CURRENT is
   generated when TWO DISSIMILAR
   METALS are connected IN ANY WAY.
            GALVANIC ACTION



1. PRIME CAUSE OF METALLIC
   DESTRUCTION IN BOATS.
2. SALT WATER BIGGEST OFFENDER
3. ONE METAL ALWAYS SACRIFICED
              GALVANIC ACTION


      TWO METAL CLASSIFICATIONS
1. CURRENT FLOWS FROM THE LEAST
   NOBLE TO THE MOST NOBLE METAL.
2. MOST NOBLE: CURRENT FLOWS into.
3. LEAST NOBLE: CURRENT FLOWS out of.
4. Current OUT OF destroys the (LEAST
   NOBLE) metal.
                GALVANIC ACTION



MOST NOBLE ( Least susceptible and least
sacrificed): Mercury, Monel, Nickel, Silicon Bronze
LEAST NOBLE ( MOST SUSCEPTIBLE TO
DESTRUCTION): BRASS, ALUMINUM,
ANYTHING GALVANIZED, ZINC and
MAGNESIUM.
                GALVANIC ACTION


1. Remember: It takes two to tango! There are
   ALWAYS more than two dissimilar metals on
   any boat!
2. The PROBLEM is ALWAYS there, unless taken
   care of!
                        GALVANIC ACTION

Any time you have two different metals that are physically or electrically
   connected and immersed in seawater, they become a battery.

Current flows between the two metals. The electrons that make up that current are
    supplied by one of the metals giving up bits of itself-in the form of metal ions-
    to the seawater. This is called galvanic corrosion and, left unchecked, it
    quickly destroys underwater metals.

The most common casualty of galvanic corrosion is a bronze or aluminum
    propeller on a stainless steel shaft, but metal struts, rudders, rudder fittings,
    outboards, and stern drives are also at risk.
         COUNTERACTING GALVANICS

1. Add a SACRIFICIAL metal.
2. THE COMMON ZINC: Comes in all sizes, shapes.
   READILY AVAILABLE. INEXPENSIVE.
3. FREQUENT INSPECTION for signs of destruction:
   greyish color, pitted, pieces broken off.
4. REPLACE IMMEDIATELY with new zincs.
5. BRIGHT zincs are those NOT RESPONDING; NOT
   PROTECTING THE NOBLE METAL!
                GALVANIC ACTION


                    **NOTE**
   NEVER---NEVER---NEVER LET ANYONE
           PAINT YOUR ZINCS.
Paint provides an insulating surface that prevents
the zinc from doing it’s job. In the meantime, your
shafts, rudder plates and posts, etc. continue to be
eaten away.
         THE SHAFT TRAIN




4/2010       Ted Potter DCAPT/SHR   24
             THE SHAFT TRAIN
1. The SHAFT TRAIN inside the boat translates
   the POWER of the engine to the propeller
   outside of the boat.
2. The shaft (power) train, except V- and Hydraulic
   drives consists of:
  a). Shaft Log b). Shaft c) Strut
  d.) Strut bearing e.) Propeller.
                 THE SHAFT TRAIN

1. PROPELLER: Varying sizes of PITCH, DIAMETER,
   CIRCUMFERENCE, LEFT or RIGHT ROTATION,
   SHAFT-HOLE SIZE, NUMBER OF BLADES and
   TYPE of METALS.
2. PITCH: Distance propeller will move ahead in ONE
   revolution.
3. LOCK NUT: Holds the propeller on the shaft. Probably
   the MOST important piece of the entire TRAIN.
TYPICAL STUFFING BOX
          REVIEW QUESTIONS NO. 1

1. The condition of dry rot is usually_______
   a. very slow to spread.
   b. eliminated by soaking affected areas with
     turpentine and then coating with “spar”
     varnish.
   c. first indicated by a distinctive odor.
   d. produced by an excessively dry
     environment.
         REVIEW QUESTIONS NO. 2

2. Galvanic action_____________________
    a. is caused by two dissimilar metals being
    electrically connected and immersed, either totally or
    partially, in sea water
    b. effects ferrous materials only
    c. is of most concern when there are stray
    electrical currents in the area.
    d. is always located where the shaft is

      attached to the inboard engine.
        REVIEW QUESTIONS NO. 3


3. The strut bearing____________________
    a. relies on water for lubrication.
    b. is stuffed with oakum and grease.
    c. is located inside the hull.
    d, is located where the shaft is attached to the
      engine .
        REVIEW QUESTIONS NO. 4

4. The most effective way to combat “dry
    rot” when it is found is to ______
    a. soak the affected area with turpentine
      then coat with spar varnish.
    b. dig out the soft spots with a knife and paint
      the entire area
    c. cut out the affected wood plus some good wood.
    d. keep affected areas dampened with fresh water.
      REVIEW QUESTIONS NO. 5

5. A good method to combat
galvanic action is to ________
    a. use the same metal throughout the boat.
    b. electrically connect dissimilar metals
    immersed in sea water.
    c. eliminate all stray electrical currents
    d. add a sacrificial metal.
        REVIEW QUESTIONS NO. 6

6. What is used to keep the propeller on
    the shaft?
    a. locking ring
    b. a lock nut
    c. a slot
    d. a collar
           REVIEW QUESTIONS

7. The two types of marine growth are__
    a. barnacles and moss
    b. oysters and grass
    c. worms and oysters
    d. vegetable and animal
         REVIEW QUESTIONS NO.8



8. The primary effect of marine growth
    on the hull is ________________
    a. to slow it’s speed
    b. little or none
    c, not well known
    d. negligible
       REVIEW QUESTIONS NO. 9


9. The proper way to store a boat is to__
    a. always let the weight rest on the
       shoring.

    b. never let the weight rest on the
       shoring
    c. never shore the boat
    d. never cover the boat
       REVIEW QUESTIONS NO. 10

10. In galvanic action, the current flows
from the _____ to the ____metal.
    a. less noble/more noble
    b. more noble/less noble
    c. negative/positive
    d. positive/negative

								
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