Maines building time of nine years was unusually protracted as a result of the limits of American industry at the time. (The delivery of her armored plating took three years, and a fire in the drafting room of the building yard, where
Maines working set of
blueprints were stored, caused further delay.) During the nine-year construction span, naval tactics and technology changed radically and left
Maines role in the navy ill-defined. At the time when she was laid down, armored cruisers such as
Maine were intended to serve as small battleships on overseas service and were built with heavy belt armor. Great Britain, France and Russia had constructed such ships to serve this purpose and sold others of this type, including
Riachuelo, to second-rate navies. Within a decade, this role had changed to one of commerce raiding, for which fast, long-range vessels, with only limited armor protection, were needed. The advent of lightweight armor, such as
Harvey steel, made this transformation possible. As a result of these changing priorities,
Maine was caught between two separate positions and could not perform either one adequately. She lacked both the armor and firepower to serve as a ship-of-the-line against enemy battleships and the speed to serve as a cruiser. Nevertheless, she was expected to fulfill more than one tactical function. In addition, because of the potential of a warship sustaining blast damage to herself from cross-deck and end-on fire,
Maines main-gun arrangement was obsolete by the time she entered service.
General characteristics Maine was long
overall, with a beam of , a maximum draft of and a displacement of . She was divided into 214 watertight compartments. A centerline longitudinal watertight
bulkhead separated the engines and a
double bottom covered the hull only from the foremast to the aft end of the armored citadel, a distance of . She had a
metacentric height of as designed and was fitted with a ram bow.
Maines hull was long and narrow, more like that of a cruiser than that of
Texas, which was wide-beamed. Normally, this would have made
Maine the faster ship of the two, but
Maines weight distribution was ill-balanced, which slowed her considerably. Her main turrets, awkwardly situated on a cutaway gundeck, were nearly awash in bad weather. Because they were mounted toward the ends of the ship, away from its center of gravity,
Maine was also prone to greater motion in heavy seas. While she and
Texas were both considered seaworthy, the latter's high hull and guns mounted on her main deck made her the drier ship. The two main gun turrets were
sponsoned over the sides of the ship and echeloned to allow both to fire fore and aft. The practice of
en echelon mounting had begun with Italian battleships designed in the 1870s by
Benedetto Brin and followed by the British Navy with , which was laid down in 1874 but not commissioned until October 1881. This gun arrangement met the design demand for heavy end-on fire in a ship-to-ship encounter, tactics that involved
ramming the enemy vessel. The wisdom of this tactic was largely theoretical at the time when it was implemented. A drawback of an
en echelon layout limited the ability for a ship to fire
broadside, a key factor when employed in a
line of battle. To allow for at least partial broadside fire,
Maines
superstructure was separated into three structures. This allowed both turrets to fire across the ship's deck (cross-deck fire), between the sections. This ability was limited as the superstructure restricted each turret's
arc of fire. This profile view and plan show
Maine with eight six-pounder guns. Another early published plan shows the same. In both cases, the photographs show a single extreme bow mounted six-pounder and confirm that she did not carry that gun.
Maines armament setup in the bow was not identical to that of the stern, which had a single six-pounder mounted at extreme aft of the vessel.
Maine carried two six-pounders forward, two on the bridge and three on the stern section, all one level above the abbreviated gun deck that permitted the ten-inch guns to fire across the deck. The six-pounders located in the bow were positioned more forward than were the pair mounted aft, which necessitated the far aft single six-pounder.
Propulsion Maine was the first American capital ship for which its power plant was afforded as high a priority as was its fighting strength. Her machinery, built by the N. F. Palmer Jr. & Company's Quintard Iron Works of New York, was the first designed for a major ship under the direct supervision of Arctic explorer and future
commodore George Wallace Melville. She had two inverted
vertical triple-expansion steam engines, mounted in watertight compartments and separated by a fore-to-aft bulkhead, with a total designed output of . Cylinder diameters were (high-pressure), (intermediate pressure) and (low-pressure). Stroke for all three pistons was . Melville mounted
Maines engines with the cylinders in vertical mode, a departure from conventional practice. Previous ships had had their engines mounted in horizontal mode so that they would be completely protected below the waterline. Melville believed that a ship's engines needed ample room to operate and that any exposed parts could be protected by an armored deck. He therefore opted for the greater efficiency, lower maintenance costs and higher speeds offered by the vertical mode. The engines were constructed with the high-pressure cylinder aft and the low-pressure cylinder forward. According to the ship's chief engineer A. W. Morley, this was done so that the low-pressure cylinder could be disconnected when the ship was under low power. This allowed the high and intermediate-power cylinders to be run together as a
compound engine for efficient running. Eight single-ended
Scotch marine boilers provided steam to the engines at a working pressure of at a temperature . On trials, she reached a speed of , failing to meet her contract speed of . She carried a maximum load of 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 a very low capacity for a ship of
Maines rating, which limited her time at sea and her ability to run at
flank speed, when coal consumption increased dramatically.
Maines 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 extreme.
Maine also carried two small
dynamos to power her searchlights and provide interior lighting.
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.
Armament Main guns Maines main armament consisted of four
/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 shell at a
muzzle velocity of to a range of 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. The 10-inch guns were initially to be mounted in open
barbettes (the C & R proposal blueprint shows them as such). During
Maines extended construction, the development of rapid-fire intermediate-caliber guns, which could fire high-explosive shells, became a serious threat and the navy redesigned
Maine with enclosed turrets. Because of the corresponding weight increase, the turrets were mounted one deck lower than planned originally. Even with this modification, the main guns were high enough to fire unobstructed for 180° on one side and 64° on the other side. They could also be loaded at any angle of train; initially the main guns of
Texas, by comparison, with external rammers, could be loaded only when trained on the centerline or directly abeam, a common feature in battleships built before 1890. By 1897,
Texas turrets had been modified with internal rammers to permit much faster reloading. The
en echelon arrangement proved problematic. Because
Maines turrets were not counterbalanced, she heeled over if both were pointed in the same direction, which reduced the range of the guns. Also, cross-deck firing damaged her deck and superstructure significantly due to the vacuum from passing shells. The anti-torpedo boat armament consisted of seven
Driggs-Schroeder six-pounder guns mounted on the superstructure deck. They fired a shell weighing about at a muzzle velocity of about at a rate of 20 rounds per minute to a maximum range of . The lighter armament comprised four each
Hotchkiss and Driggs-Schroeder one-pounder guns. Four of these were mounted on the superstructure deck, two were mounted in small casemates at the extreme stern and one was mounted in each
fighting top. They fired a shell weighing about at a muzzle velocity of about at a rate of 30 rounds per minute to a range about .
Maine had four above-water
torpedo tubes, two on each broadside. In addition, she was designed to carry two steam-powered torpedo boats, each with a single torpedo tube and a one-pounder gun. Only one was built, but it had a top speed of only a little over so it was transferred to the
Naval Torpedo Station at
Newport, Rhode Island, as a training craft.
Armor The main waterline
belt, made of nickel steel, had a maximum thickness of and tapered to at its lower edge. It was long and covered the machinery spaces and the 10-inch
magazines. It was high, of which was above the design waterline. It angled inwards for at each end, thinning to , to provide protection against
raking fire. A 6-inch transverse bulkhead closed off the forward end of the
armored citadel. The forward portion of the protective deck ran from the bulkhead all the way to the bow and served to stiffen the ram. The deck sloped downwards to the sides, but its thickness increased to . The rear portion of the protective deck sloped downwards towards the stern, going below the waterline, to protect the propeller shafts and steering gear. The sides of the circular
turrets were 8 inches thick. The barbettes were 12 inches thick, with their lower portions reduced to 10 inches. The
conning tower had 10-inch walls. The ship's
voicepipes and electrical leads were protected by an armored tube thick. Two flaws emerged in
Maines protection, both due to technological developments between her laying-down and her completion. The first was a lack of adequate topside armor to counter the effects of rapid-fire intermediate-caliber guns and high-explosive shells. This was a flaw she shared with
Texas. The second was the use of nickel-steel armor. Introduced in 1889, nickel steel was the first modern steel
alloy armor and, with a
figure of merit of 0.67, was an improvement over the 0.6 rating of
mild steel used until then. Harvey steel and
Krupp armors, both of which appeared in 1893, had merit figures of between 0.9 and 1.2, giving them roughly twice the tensile strength of nickel steel. Although all three armors shared the same density (about 40 pounds per square foot for a one-inch-thick plate), six inches of Krupp or Harvey steel gave the same protection as 10 inches of nickel. The weight thus saved could be applied either to additional hull structure and machinery or to achieving higher speed. The navy would incorporate Harvey armor in the s, designed after
Maine, but commissioned at roughly the same time. == Launching and delay ==