Ships to Australia

My question: Is there a record of a Norwegian Ship Captained by Hans Helmer Leth with cabin boy Jorgen Emil Leth which sailed from Norway to Australia between 1860 and 1884. My Great Grandfather Jorgen Emil Leth was born 25-10-1854 to ships carpenter Samuel Nikolai Leth ( or Hansen ). Samuel was born at Birkeland on 27/11/1824 but is believed to have lived his life on Tromoy with a family named Hansen. After his father's death at Varmekrogen Stromsboe on 28/04/1864, Jorgen became a cabin boy on a ship captained by his grandfather, Hans Helmer Leth but he told stories that he escaped the ship several times but was caught until he was successful aged 16 in approx 1870 at Port Adelaide Australia I've tried to find a ship captained by Hans Helmer Leth without success and can't find any record of Jorgen on any ships crews in Australian Ports between 1864 and 1884. His first child was born in Australia in 1885 but there are no records of his life between then and the 1865 census which shows Jorgen at home in Ostre Moland with his mother Maren Leth and his brothers Hans and Jens. can anyone help with the name of a ship. My late mother remembered a painting of a large 4 masted ship on his wall when she was a child and he made mention of the wheat races ???