<P> Eight single - ended Scotch marine boilers provided steam to the engines at a working pressure of 135 pounds per square inch (930 kPa; 9.5 kgf / cm) at a temperature 364 ° F (184 ° C). On trials, she reached a speed of 16.45 knots (30.47 km / h; 18.93 mph), failing to meet her contract speed of 17 knots (31 km / h; 20 mph). She carried a maximum load of 896 long tons (910 t) of coal in 20 bunkers, 10 on each side, which extended below the protective deck . Wing bunkers at each end of each fire room extended inboard to the front of the boilers . This was actually a very low capacity for a ship of Maine's rating, which limited her time at sea and her ability to run at flank speed, when coal consumption increased dramatically . Maine's overhanging main turrets also prevented coaling at sea, except in the calmest of waters; otherwise, the potential for damage to a collier, herself or both vessels was extremely great . </P> <P> Maine also carried two small dynamos to power her searchlights and provide interior lighting . </P> <P> Maine was designed initially with a three - mast barque rig for auxiliary propulsion, in case of engine failure and to aid long - range cruising . This arrangement was limited to "two - thirds" of full sail power, determined by the ship's tonnage and immersed cross-section . The mizzen mast was removed in 1892, after the ship had been launched, but before her completion . Maine was completed with a two - mast military rig and the ship never spread any canvas . </P> <P> Maine's main armament consisted of four 10 - inch (254 mm) / 30 caliber Mark II guns, which had a maximum elevation of 15 ° and could depress to − 3 ° . Ninety rounds per gun were carried . The ten - inch guns fired a 510 pounds (231 kg) shell at a muzzle velocity of 2,000 feet per second (610 m / s) to a range of 20,000 yards (18,000 m) at maximum elevation . These guns were mounted in twin hydraulically powered Mark 3 turrets, the fore turret sponsoned to starboard and the aft turret sponsoned to port . </P>

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