Editing Indiana-class battleship (section)

=== Propulsion ===
Two vertical inverted [[triple expansion]] [[reciprocating steam engine]]s powered by four [[Scotch marine boiler#Double-ended|double-ended Scotch boilers]] drove twin propellers, while two single-ended Scotch boilers supplied steam for auxiliary machinery.{{sfn|Reilly|Scheina|1980|p=58}} The engines were designed to provide {{convert|9000|ihp|lk=on}}, giving the ships a top speed of {{convert|15|kn|lk=on}}.{{sfn|Friedman|1985|p=425}} During [[sea trial]]s, which were conducted with limited amounts of coal, ammunition and supplies on board, it was found that the indicated horsepower and top speed exceeded design values and a significant variation between the three ships existed. The engines of ''Indiana'' delivered {{cvt|9700|ihp}}, giving a top speed of {{cvt|15.6|kn}}. ''Massachusetts'' had a top speed of {{cvt|16.2|kn}} with {{cvt|10400|ihp}} and ''Oregon'' reached a speed of {{cvt|16.8|kn}} with {{cvt|11000|ihp}}.{{sfn|Reilly|Scheina|1980|p=68}} Eight [[Babcock & Wilcox boiler]]s, including four with [[superheater]]s, were installed on ''Indiana'' in 1904 and the same number on ''Massachusetts'' in 1907 to replace the outdated Scotch boilers.{{sfn|Reilly|Scheina|1980|p=62}}