Exam (elaborations)
AUXSEA (1)
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Exam of 16 pages for the course Football Rules at Football Rules (AUXSEA (1))
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AUXSEAA fiberglass hull is composed of - ANS-fiberglass strands and layers saturated with resin.
List the four types of fiberglass reinforcing materials: - ANS-1. Fiberglass Mat
2. Fiberglass Cloth
3. Woven Roven
4. Chopped Strands
The two types of resins used in fiberglass construction are - ANS-polyester and epoxy.
There are many substances added to boat building resins. - ANS-They are used to harden the
resin, control curing time and make the resin fire retardant.
A male mold is known as a - ANS-plug.
A female mold is known as a - ANS-cavity mold.
The hand-layup and chopped-strand processes are used in a - ANS-cavity mold.
In the hand-layup and chopped-strand processes, - ANS-the gel coat is applied to the inside of
the mold first.
In the matched-die method, - ANS-the male and female molds are clamped together with a
laminate between.
What core materials are used in sandwich construction? - ANS-Balsa wood Foamed Plastic
Plywood
List the advantages of fiberglass-built boats. - ANS-Fiberglass is: Impervious to marine borers.
No seams or joints to leak. Color can be molded into the boat. Boats can be extremely strong.
Fiberglass can be molded into almost any shape.
List the disadvantages of fiberglass-built boats. - ANS-Fiberglass is heavier than water
Fiberglass hulls are very heavy Easy to cover shoddy workmanship
What are the two general classes of wood? - ANS-Hardwood Softwood.
What are the principal considerations in the selection of various types of wood for boat building?
- ANS-Strength Decay resistance Availability
,List the advantages of steel for boat building. - ANS-Higher strength-to-weight ratio than
fiberglass, Highest strength-to-weight ration, High resistance to impact, Abrasion and fatigue
resistance, Less noisy than all but wood, Resistant to fire.
The disadvantage of steel for boat building is that - ANS-it deteriorates easily without proper
maintenance.
Why must you put a layer of nonmetallic paint between the hull of an aluminum boat and a layer
of copper bottom paint? - ANS-Galvanic action will corrode the hull if the aluminum and copper
touch. Note: Copper bottom paint is now illegal and not used.
List the advantages of aluminum for boat building. Aluminum is: - ANS-lightweight impervious to
marine borers.
List the disadvantages of aluminum for boat building. - ANS-It is a good heat conductor so
aluminum hulls sweat, It has a relatively low melting point and melts sooner than steel if there is
a fire. It is noisy.
The six types of steering systems are: - ANS-Tiller Drum and Cable Sprocket and Chain Rack
and Pinion Gear and Shaft Hydraulic
The simplest steering system is - ANS-the tiller.
The curve or sweep of the deck of a vessel when viewed from the side is - ANS-the sheer.
The outward curvature of the sides of the boat near the bow that is used to keep the deck drier
is called - ANS-the flare.
What are the three basic shapes of the bottom of a boat? - ANS-Flat Round Vee
What is the difference between a displacement and planing hull? - ANS-A displacement hull
displaces water without riding above its bow wave as it moves. A planing hull allows the hull to
ride up on the after part of the hull when it moves fast enough.
In wood boat construction, the plank attached starting at the gunwale is - ANS-the sheer strake.
A timber fastened along the top of the keel is called - ANS-the Keelson
What is the difference between a trunk cabin and a raised deck cabin? - ANS-A raised deck
cabin extends the full width of the hull while the trunk cabin extends less than the width of the
hull so walkways are left on either side.
What are limber holes and what purpose do they serve? - ANS-Holes cut in the frame near the
keel which drain water to the bilge sump area. They allow the bilge to be drained.
, The use of two or more materials in the hull of a vessel is known as - ANS-composite
construction.
The portion of the exterior hull at the waterline is called - ANS-the boot top.
The spoke of a steering wheel that is vertical when the rudder is exactly centered is - ANS-the
king spoke.
The vertical distance between the waterline and gunwale is - ANS-freeboard.
The transverse seats in rowing craft are called thwarts the center of which is supported by -
ANS-the thwart stanchion.
Describe the characteristics of the following sailboat types: - ANS-Catboat A small boat with a
single mast set far forward and only one sail. Sloop A boat with a single mast carrying a main
sail and one sail forward. Ketch A vessel with two masts; the smaller mizzen is aft but forward of
the rudderpost. Yawl A vessel with two masts; the small mizzen aft of the rudderpost Schooner
A vessel with two or more fore-and-aft rigged masts with the aft mast larger than the other(s).
The gross tonnage of a vessel is ________ - ANS-A measurement of the entire capacity of a
ship expressed as one gross ton for each 100 cubic feet of internal volume.
What is the proper way to block up a hull? - ANS-The weight of the boat should rest on the keel.
The keel should rest on blocks to allow ventilation. Blocks should be every five feet and high
enough to allow working space under the hull.
Why shouldn't you allow the weight of the boat to rest on the shoring? - ANS-Excessive strain
on the hull can damage the boat.
List the lay-up chores that must be done after the boat is hauled out. - ANS-Clean bottom of all
marine growth and animal life. Wash the hull with fresh water. Drain the water system and
winterize it if necessary. (There is a very long list.)
What is the purpose of allowing the boat to ventilate when it is layed up? - ANS-Ventilation
prevents condensation which can cause dry rot and mildew.
The two types of marine growth are - ANS-vegetable and animal.
What are the two things that can happen to a wooden boat that is not protected against marine
growths? - ANS-Performance can be reduced. The hull can be weakened or destroyed.
How does copper protect a boat's hull? - ANS-Copper in salt water gives of poisonous salts
which prevent adhesion of plant and animal life. Note: Copper hull paint is now illegal.
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