Keel off
The loose keel , also known as loose keel or false keel , is a strong wooden plank traditionally attached under the actual keel of a ship , especially in wooden shipbuilding , which can detach when it comes into contact with the ground without leaks . Its main purpose is to protect the actual keel and thus the hull from damage, but it also serves to reduce the drift of the ship.
In principle, it is a strong bar that is only relatively lightly attached to the underside of the actual keel by means of a spike , butt bolt or hook bolt, so that it can be easily and possibly completely detached from the latter without significantly damaging it. The loose keel consisted, depending on the length of the ship, of several beams or planks that were lined up and connected by straps . It should not have a great height, as this would have increased the draft of the ship and thus the risk of bottoming.
In sailing ships , the reduction in the drift was not infrequently the reason for hanging a second loose keel under the first, whereby the increase in draft was accepted.
In the case of the German Imperial Navy , too , the wooden loose keel was still mounted under the actual steel keel in order to protect the ship from initial bumps when it hit the ground.
Footnotes
- ↑ Johann Theodor Adolf van Hüllen: Guide for instruction in shipbuilding at the training institutes of the Imperial German Navy. Lipsius & Tischer, Kiel Leipzig, 1888, p. 24
literature
- Rudolf Brommy & Heinrich von Littrow: The Navy. Hartleben, Vienna / Pest / Leipzig, 1878, p. 66 (reprint of the original, 1st edition, Salzwasser Verlag, Paderborn, 2011, ISBN 978-3-86195-958-8 )
- Illustration, in Meyers Konversationslexikon , Verlag des Bibliographisches Institut, Leipzig and Vienna, fourth edition, 1885-1892, volume 14: Rüböl - Sodawasser (→ Schiff)
- Lueger: Lexicon of all technology
- J. Friedrichson: Schifffahrts-Lexikon: together with an outline of the history of shipping and its development. Books on Demand, 2012, p. 150
- Johann Theodor Adolf van Hüllen: Shipbuilding - Guide for teaching in shipbuilding at the training institutes of the Imperial German Navy. Lipsius & Tischer, Kiel Leipzig, 1888, p. 24 (reprint of the original edition from 1888, Salzwasser Verlag, Paderborn, 2010, ISBN 978-3-86195-588-7 )