| 翻訳と辞書 |
| Gas-checks in British RML heavy guns ： ウィキペディア英語版 |
Gas-checks in British RML heavy guns
Gas-checks〔The term "gas-check" is was hyphenated in late 1880s and early 1900s official British government publications such as treatises on ammunition and handbooks for various guns.〕 were attachments to ammunition that revolutionised the performance of RML heavy guns.〔In this article, "RML heavy guns" includes rifled muzzle-loading guns and howitzers of 7 inches calibre or larger〕 The first generation of RML heavy guns began entering service in about 1865. They all had Woolwich rifling〔Ref 1877 292; Ref 1879 pp.45〕 and relied on studs on the projectiles for rotation. Gas-checks were first introduced in 1878 or soon after. They significantly reduced wear on the guns while also increasing their range and accuracy. Before long, studless ammunition was being manufactured for these guns, using gas-checks for projectile rotation. Gas-checks also facilitated a switch to the second generation of RML guns which used polygroove rifling and only supported studless ammunition.
==Introduction==
The first RML heavy guns were introduced into British service in about 1865. By 1878, 11 models of Woolwich rifled guns had been introduced, ranging from 7 inches to 12.5 inches.〔Ref 1873 pp. 528, 530-533; Ref 1877 p. 292〕 Unfortunately, Woolwich rifling had a major defect, namely, that hot powder gas escaping around the ammunition ("Windage") caused excessive barrel erosion, especially in the rifling grooves.〔Ref 1878 p. 134〕 Extensive research was performed in the early 1870s to find a solution, and by 1878 two types of gas-checks had been designed. Both gas-checks were made of copper with a little added zinc. They were, in effect, shallow cups of about the same diameter as the ammunition that were attached to the base of the ammunition. When the gun was fired, the powder gas pressure forced the sides of the cup into the rifling grooves, creating a gas seal. It was immediately found that gas-checks also increased the range of guns, and provided greater accuracy. It was also realised that gas-checks were capable of rotating the ammunition, removing the need for studs. This facilitated the use of polygroove rifling, which used a lot of shallow grooves, in place of the Woolwich system which used only a few deeper grooves. Polygroove rifling was less detrimental to the strength of the guns. Also, studless ammunition was stronger and flew more accurately than studded ammunition. Shell strength was particularly important for armour-piercing ammunition.
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「Gas-checks in British RML heavy guns」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.
|
|