SS "Savannah" was an American hybrid sailing ship/sidewheel steamer built in 1818. She was the first steamship to cross the Atlantic Ocean, transiting mainly under sail power from May to June 1819. In spite of this historic voyage, the great space taken up by her large engine and its fuel at the expense of cargo, and the public's anxiety over embracing her revolutionary steam power, kept "Savannah" from being a commercial success as a steamship. Originally laid down as a sailing packet, she was, following a severe and unrelated reversal of the financial fortunes of her owners, converted back into a sailing ship shortly after returning from Europe.