MTC Hull & Structural Systems Flashcards

What type of caulking compound is best suited for sealing teak deck seams on a marine vessel?

Answer: Polysulfide sealant

Polysulfide sealant is the traditional choice for teak deck seams because it remains flexible, is compatible with wood, and can be easily removed for re-caulking.

When evaluating a vessel's structural integrity, what does delamination in a fiberglass hull indicate?

Answer: Separation of fiberglass layers due to impact or water intrusion

Delamination occurs when the bond between fiberglass plies fails, reducing structural strength significantly and requiring professional repair or full section replacement.

What is the purpose of a transom drain plug in a trailered boat?

Answer: To drain bilge water while the boat is on the trailer

The transom drain plug allows water accumulated in the bilge to drain out by gravity when the boat is out of the water on a trailer, a mandatory step before launching.

Which US federal regulation requires recreational vessels to display a capacity plate?

Answer: 33 CFR Part 183

33 CFR Part 183 (Federal Boat Safety Act) requires monohull powerboats under 20 feet to display a USCG-approved capacity plate showing maximum persons, weight, and horsepower ratings.

What is the MOST effective method to detect a hidden structural crack in a fiberglass hull?

Answer: Percussion testing (tapping) combined with moisture meter readings

Tapping the hull reveals delamination and voids by a change in sound (hollow vs. solid), while a moisture meter quantifies water content in the laminate, together pinpointing hidden damage.

When antifouling paint is applied to a vessel's bottom, what is its primary function?

Answer: To prevent barnacles, algae, and other marine organisms from attaching to the hull

Antifouling paint contains biocides that deter marine growth, which if left unchecked would significantly increase hull drag and reduce vessel performance and fuel efficiency.