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Röchling shells were bunker-busting artillery shells, developed by German engineer August Cönders during World War II, based on the theory of increasing sectional density to improve penetration. Röchling shells were tested in 1942 and 1943 against the Belgian Fort d'Aubin-Neufchâteau〔(Les étranges obus du fort de Neufchâteau )〕 The artillery shells were fired indirectly and able to penetrate much more than of reinforced concrete roof before burying the shell through the floor and into earth. However these shells had low muzzle velocity, and as such ad high dispersion on range. As a result, they saw very limited use during World War II; only about 200 shells were ever fired even though 6000 such shells were made for the very large howitzers like the 21 cm mortar. Röchling shells were developed for the 21 cm Mörser 18, 34 cm railway gun 674(f) and for the 35.5 cm Haubitze M1 only. In addition many experimental HE shells were made for the 37mm PAK and 50mm PAK weapons. They were regarded as a secret German weapon, and there is speculation that the limited use was in order to reduce the chance of dud shells being captured and exploited by the Allied forces. A more likely reason, however, is the poor accuracy of the shells. 〔(【引用サイトリンク】 title=V 3 – THE HIGH-PRESSURE PUMP GUN )〕 ==References== 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「Röchling shell」の詳細全文を読む スポンサード リンク
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