drop keel

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.

The boat had two drop keels and was fitted out with water ballast tanks.

In general there is the drop keel or swing keel .

There have been broken bones, broken rigs, dropped keels, and sadly, one death.

For stability he had them fitted with three Shank sliding or drop keels (actually removable centreboards).

The most common is a traditional research vessel, with the echosounders mounted on the ship's hull or in a drop keel.

She also has a retractable transducer centerboard (drop keel) for deploying various sensors under the vessel.

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 .

Designer Alan Buchanan was commissioned to build a sturdy shallow drafted boat with a drop keel suitable for use on the Dee estury which could be used for both racing and family picnics.

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.

Special features of the ship are a 'gondola', similar to a winged keel, mounted 1.5 m below the hull, and two drop keels, to carry scientific instruments below the layer of microbubbles created by the movement of the ship's hull through the water.

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.