drop keel造句

• For a second attempt to surface, the 11-ton drop keel was released.
• For drop keels full cabin height cases are usually required under safety rules.
• All were brig-rigged and received Schank sliding or drop keels.
• In general there is the drop keel or swing keel.
• She also has a retractable transducer centerboard ( drop keel ) for deploying various sensors under the vessel.
• Underwater acoustics instrumentation is fitted in two drop keels as well as special " arctic tanks " for operations in ice-covered seas.
• A drop keel containing transducers for the measurement of plankton density and ocean currents can be lowered below the bottom of the ship.
• A drop keel can be sailed with the board partly raised without upsetting the centre of hull resistance and balance of the boat.
• Swing keel cases can sometimes be kept beneath floors and intrude less into the cabin, but are considered less efficient than a drop keel.
• After 10 hours, Lonsdale made an attempt to resurface, including ditching the vessel's 11-ton drop keel which meant the submarine would never be able to dive again.
• Although keels must be locked down when racing, the swing keel has safety advantages for if it runs aground the keel will kick up and either slide over an obstruction or slow the boat, whereas a drop keel will stop a yacht abruptly.
• A notable construction feature is the 180 lb drop keel, which unlike the Flying Fifteen and other small racing keelboats, allows Skua to be kept on a ( lower cost ) drying mooring, and makes handling ashore much easier than it would be with a fixed keel.
• Each was fitted with a Schank drop keel, and lighter bow chasers replaced the heavy pair of guns firing forward over the bows; in later vessels one of the bow chasers would be moved aft to become a stern chaser, both of these guns then being mounted on the centreline and able to pivot.
• Special features of the ship are a " gondola ", similar to a winged keel, mounted 1.2 m below the hull, and two drop keels ( which can be lowered to a maximum of 4m below the hull ), to carry scientific instruments below the layer of microbubbles created by the movement of the ship s hull through the water.