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The plug is machined to accept a typical bottom bracket, but offset from the center of the plug, so that by rotating the plug, the location of the bottom bracket (and hence the chain tension) may be adjusted (fore and aft to tension the chain, the upper or lower eccentric position for a given chain length can be chosen to fine tune bottom ...
Floating Shelf Brackets: Floating Shelf Brackets are designed to suspend a shelf slab, counter, or mantel on the wall without visible mounting hardware. [ 6 ] There are various other bracket types, including lintel brackets, dentil brackets, gable brackets, balcony brackets, beam brackets, and rafter brackets.
A long narrow centreboard produces less drag than a short, wide one for a given amount of lift, resulting in a faster boat that can point closer into the wind. A fore and aft, pivoting centreboard can also be used to move the centre of lateral resistance aft to match a change in sail plan, such as furling or dropping the jib.
On flying boats – as first patented by Claudius Dornier and first used on the Kaiserliche Marine ' s German World War I flying boat, the Zeppelin-Lindau Rs.IV [3] [4] – a sponson can help extend the hull higher in the water, reducing drag and providing additional lift when the plane is taking off.
In medieval times, warships had a single deck, with raised structures at each end: the "forecastle" in the front, and the "aftercastle" in the rear.Following the introduction of cannon, the aftercastle was gradually replaced with a simpler structure consisting of the halfdeck above the main deck, extending forwards from the stern to the mainmast; and above that the quarterdeck, extending about ...
[2] [3] It is one of the strongest symmetric thread profiles; however, for loads in only one direction, such as vises, the asymmetric buttress thread profile can bear greater loads. The trapezoidal metric thread form is similar to the Acme thread form, except the thread angle is 30°. [4] [5] [6] It is codified by DIN 103. [7]