翻訳と辞書 Words near each other ・ Hull's Trace North Huron River Corduroy Segment ・ Hull, Florida ・ Hull, Georgia ・ Hull, Illinois ・ Hull, Iowa ・ Hull, Marathon County, Wisconsin ・ Hull, Massachusetts ・ Hull, North Dakota ・ Hull, Portage County, Wisconsin ・ Hull, Quebec ・ Hull, Texas ・ Hull, West Virginia ・ Hull, Wisconsin ・ Hull-Daisetta High School ・ Hull-Daisetta Independent School District ・ Hull-down ・ Hull-Hawkins House ・ Hull-Ottawa Canadiens ・ Hull-Warriner Award ・ Hull-Wolcott House ・ Hulla ・ Hullabahoos ・ Hullabaloo ・ Hullabaloo (band) ・ Hullabaloo (festival) ・ Hullabaloo (film) ・ Hullabaloo (rave) ・ Hullabaloo (The Farm album) ・ Hullabaloo (TV series) ・ Hullabaloo in the Guava Orchard Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hull-down ： ウィキペディア英語版 Hull-down In sailing and warfare, hull-down means that the upper part of a vessel or vehicle is visible, but the main, lower body (hull) is not; the opposite term hull-up means that all of the body is visible. The terms originated with sailing and naval warfare in which the curvature of the earth causes an approaching vessel to be first visible "sails-up." Beginning in the 20th century, ''hull-down'' has also been used in armoured warfare. In modern armoured warfare, hull-down is a position taken up by an armoured fighting vehicle (AFV) so that its hull (the main part of the vehicle) is behind a crest or other raised ground, but its turret (or a superstructure or roof-mounted weapon) is exposed. Turret-down is the position in which the vehicle's crew can observe forward from roof hatches, but the vehicle is completely hidden (usually a few metres further back from a hull-down position). The belly armour should not be exposed, because it is vulnerable to even modest antitank weapons. ==Ships== Due to the convexity of the earth, a ship's upper rigging will be visible at a much greater distance than its lower hull: for example, in clear air a lookout at the top of mast above the water will be able to see the top of another 130 ft mast from over away, but will be able to see the full hull of the other ship from only away.〔(Line of Sight Distances between Two Objects )〕 With a clear horizon, whether a vessel is hull-down or hull-up gives some idea of its distance from the observer, using the line-of-sight formula. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hull-down」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.