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2. Semi-trailer aerodynamic device - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_aerodynamic...

   Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence.The two major types of device in use are trailer skirts (or side skirts), affixed to the underside of trailers, and trailer tails (or boat tails, or rear fairings), affixed to the rear.

3. Daggerboard - Wikipedia

   en.wikipedia.org/wiki/Daggerboard

   Daggerboards can be raised and lowered as needed but will generally be damaged if not retracted before impact with the bottom or with floating objects. Many small sailboats use a daggerboard instead of a fixed keel. This allows these boats to be more easily moved on trailers, sailed in shallow waters, and easily beached. [2]

4. MacGregor 26 - Wikipedia

   en.wikipedia.org/wiki/MacGregor_26

   It has a draft of 5.33 ft (1.62 m) with the daggerboard down and 1.25 ft (0.38 m) with the daggerboard up. The boat has a PHRF racing average handicap of 222 with a high of 258 and low of 198. It has a hull speed of 6.5 kn (12.04 km/h). It was replaced in production by the centerboard-equipped MacGregor 26S in 1990.

5. Slipway - Wikipedia

   en.wikipedia.org/wiki/Slipway

   A slipway, also known as boat ramp or launch or boat deployer, is a ramp on the shore by which ships or boats can be moved to and from the water. They are used for building and repairing ships and boats, and for launching and retrieving small boats on trailers towed by automobiles and flying boats on their undercarriage. The nautical terms ways ...

6. Centreboard - Wikipedia

   en.wikipedia.org/wiki/Centreboard

   Other types feature a casing under the boat, which does not take up space but instead has the problem of increased drag. For this reason, it is not uncommon to find boats with a combination of shallow keel and centreboard (e.g. Randmeer). The keel provides the housing for the centreboard, moving it out of the hull, but adds only a small amount ...

7. Otter (fishing device) - Wikipedia

   en.wikipedia.org/wiki/Otter_(fishing_device)

   An otter board Front of the otter board Folded otter board. The otter is a fishing device constructed with two parts, an otter board and a fishing line. It is steered by pulling on the line then letting stack so the slide mechanism on the board operates to switch direction. It may be used from a boat or pulled from the shore.