Ship Construction Flashcards
Sagging.
Bow and stern are on crests and midship sags.
Forces on a boat. Stresses.
Compression.
Tension.
Torsion or torque.
Shear.
Hogging.
Ship is riding on the crest of a wave. Top tension. Bottom compression.
Keel.
Strength begins with keel.
Strakes.
Planks making up the hull.
Gar board strake.
First plank or strake.
Seer strake.
Last plank butting up against the deck.
Deck stringer.
First stringer on the deck at the outer strake.
Bulkheads.
Run athwartships and strengthen the entire hull from twisting.
Cambered.
Deck is arched so the water runs off.
Scuppers or freeing ports.
Holes in the bulwark to let deck water out.
Freeboard.
Portion of hull from the waterline to the deck, which catches wind.
Bulwark.
A fence around the hull.
Shaft log.
Shaft runs through hull for engine to propeller.
Packing gland.
Seals water from coming through shaft log.
Strut and cutless bearing.
Outside shaft supporting the shaft.
Propellor is like a …
Screw moving thought the water.
Pintle and gudgeon
Rudder has pintles that fit in the gudgeon on the stern.
Displacement
Weight of water displaced by boat.
Measured in long tons 2240 lbs.
Gross tonnage.
Cubic measurement of cargo space.
Volumetric measurement.
Net tonnage.
Excludes bulkheads and machinery, just cargo.
Gross tons = L x B x D / 100 x .50 sail or .67 power
(32 x 12 x 5)/100x 0.50
