CHAPTER 2 SEAMANSHIP. BOAT MAINTENANCE. HAULING OUT. IF YOU HAUL OUT, MANY MAINTANENCE CHORES CAN BEST BE DONE AT THIS TIME. LAYING UP. Chocking or shoring up: DO NOT let the weight of the hull rest on the shoring.
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IF YOU HAUL OUT, MANY
MAINTANENCE CHORES CAN BEST BE
DONE AT THIS TIME
Make certain that the proper people can communicate with you , at all times
TWO IMPORTANT ELEMENTS
Very effective in preventing fouling by maintaining antiseptic film over the boat bottom
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.
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.
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.
STRAY ELECTRICAL CURRENTpassing through a metal object in the boat, then into a natural ground, such as sea water.
PRIMARY EFFECT: ERODES and DESTROYS
METALLIC PARTS OF THE BOAT.
Very similar to galvanic action.
Eliminate stray current sources in your boat and surrounding area by GROUNDING THE NEGATIVE BATTERY POLE to your ENGINE.
a. is of most concern when there are stray electrical currents in the area.
b. effects ferrous materials only
c. is caused by two dissimilar metals being electrically connected and immersed, either
totally or partially, in sea water.
d. is always located where the shaft is
attached to the inboard engine.
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
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.
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.
6. What is used to keep the propeller on the shaft?
a. locking ring
b. a lock nut
c. a slot
d. a collar
7. The two types of marine growth are__
a. barnacles and moss
b. oysters and grass
c. worms and oysters
d. vegetable and animal
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
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
10. In galvanic action, the current flows from the _____ to the ____metal.
a. less noble/more noble
b. more noble/less noble