Binding the Wind

From publisher blurb:

Piracy is an omnipresent threat while sailing the open seas, and none are more formidable than the treacherous slavers that seek more than simple cargo. Often putting their newly captured stock to use in the rowing banks of galleys, these predators prowl the trade lanes and get rich off the suffering of others. Among the flesh-traders, the Iron Windrunner is a ship of no small renown. It owes its fame to its namesake, an air elemental restrained in enchanted iron bondage. Thanks to a complex system of gauged pipes, this living wind engine propels the galley to nearly unparalleled speed on open sea while keeping the traditional oars for finer maneuvering.