ASA 114 Flashcards
Define or explain the following:
Bridgedeck
Decking area between the hulls of a catamaran.
Define or explain the following:
Full bridgedeck
Solid decking of the complete area between the hulls from bow to stern
Define or explain the following:
Partial bridgedeck
Some solid decking and either some open space or netting (commonly forward)
Define or explain the following:
Open deck
Fully open or netting (like the beach cats)
Define or explain the following:
“Seagull striker”/forestay bridle
Way of distributing the headstay loads and maintaining low weight forward
Define or explain the following:
“Dolphin striker”
A means of distributing the mast and rig loads on a catamaran. On beach cats this is an open structure. In most cruising cats this is either part of the bridgedeck construction or is mounted inside the main beam.
Define or explain the following:
Anchor Bridles
Anchor bridles: reduce the “sailing” at anchor common to all multihulls. This should be over 150% of the beam of the boat.
Define or explain the following:
“Galley up”
Galley up is when the galley is up in the bridgedeck cabin — more spacious and social but makes the bridgedeck very “tall.” Allows for private cabin areas. Galley down is when the galley is in one of the hulls — allows less clutter in the bridge cabin, more attractive in smaller boat (less need for standing room in the bridge cabin, opens up the bridgedeck cabin for saloon service). Galley mess hidden out of the way.
Define or explain the following:
Multihull Stability
Multihulls have great initial stability but will, once pressed too far, flip to an equally stabile inverted position. Made efficient by having the beams be wide apart (form stability) vs. primarily keel weight of a monohull.
Define or explain the following:
Nacelle
On some low bridgedeck and narrow hulled catamarans a nacelle between the bows smoothes the waves a bit and allows a large storage area. Appears as if almost a trimaran. This has grown into disfavor on new designs but may be seen on older narrow beam boats.
True or False
The stability of a cruising cat is so great that working in the galley requires no safety precautions.
False
True or False
Storing all the heavy drinks, food and water in one hull and all the light personal gear and bedding in the other makes it easy to find things and won’t unbalance even the smallest cruising cat.
False
True or False
Catamarans, especially large spacious charter cats, have excellent windward ability.
False
True or False
Placing two engines close to the centerline of the boat makes it harder to operate with one engine out of service.
False
True or False
Shoal draft, high windage and low weight cause the catamaran to drift quickly when not sailing or powering.
True
True or False
Towing the dinghy is necessary because there is little room and no safe place to store it on a multihull.
False
True or False
Having full standing headroom in the bridgedeck cabin usually increases overall height or reduces under deck clearance.
True
True or False
Crew fatigue during a passage is less problematic because of low heel angles and less rolling motion.
True
True or False
When turning a large twin engine catamaran in close quarters the use of one engine in forward and the other in reverse is common.
True
True or False
Sea anchors hold the bow toward the wind and allow for a minimum of leeway when deployed in heavy weather.
True
True or False
Because of low heel angles and less severe rolling, the multihull is not in need of jack lines and harnesses in rough weather.
False
True or False
When running in following seas the multihull will easily round-up and broach.
False