HMS Warrior is considered to be 'rather unique' as a warship - as she was equipped with both sails, and a steam engine (that was fuelled by coal):
This meant that she could navigate the oceans of the World, using one of three modes: i) just her sails. ii) just her steam engine. iii) both her sails and her steam engine - when speed was of the essence! Her sails, though retained from the days of HMS Victory (1803), also meant that Warrior had a useful fallback, in the event that she run out of coal. Despite this, her steam engine was connected to a single propeller, which could be regarded as the grandfather of all modern ship propellers (because it was of a simpler design - with only two blades). In any case, Warrior's propeller was designed, to push her 9000 tons, through the sea lanes of the British Empire.
| Nebula Hawk | Web: HMS Warrior 1860 - Museum
The stern view of HMS Hood. From here, you can see her four Manganese Bronze Propellers, which were responsible for powering her through, the World's Oceans:
You can also see, her anti-torpedo bulges (the outermost red hull form parts), which were designed to detonate an enemy torpedo, away from her vital innards (such as her boiler rooms, and her engines). This view, also best highlights a design flaw, which although it may not have affected her combat effectiveness too much, certainly affected her day to day operations: her stern deck was designed too low, and as such, was often awash - with sea water!