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wadding
Wadding is a disc of material used in guns to seal gas behind a projectile or to separate powder for shot.〔(Glossary of Firearms Terms ), Introduction to Hunter Education〕
Wadding can be crucial to a gun's efficiency, since any gas that leaks past a projectile as it is being fired is wasted. A harder or more carefully designed item which serves this purpose is often called a sabot. Wadding for muzzleloaders is typically a small piece of cloth, or paper wrapping from the cartridge.
==Model rockets==
Wadding is also used in model rockets to prevent the parachute from melting when it ejects. Without the recovery wadding the parachute would melt because the ejection is by a small solid-fuel engine. It gets so hot it melts hot glue almost immediately.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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