They are often used in larger helicopters where the internal space of the sponson can be used for fuel or to house landing gear without reducing cargo or passenger space in the fuselage as, for example, with the Sikorsky S-92 and the Bell 222.
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In the case of the Bradley Fighting Vehicle, which doubles as a troop transport and armament platform, the sponson refers to the aspect of the vehicle body directly over the tracks and includes layers of hardened, bullet-proof materials to protect the occupants.
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These changes included smaller mountings for her main guns that eliminated the sponsons needed in her sisters for the forward barbettes, the substitution of 35-calibre guns for the older 30-calibre guns and steel armor imported from Schnider et Cie of France replaced the compound armour used in her half-sisters.