1852 Passengers from Drammen/Kristiana

An 11 year old granddaughter is researching an ancestor who emigrated at age 10 for a school project. We would like to find the actual ship if possible. The year was 1852, probable departure port was Drammen or Kristiana. Family: Torsten Rolvsen Sogn, age 37, from Jevnaker Kari Larsdatter Igelsrud (or Sogn), age 44 Anne Marie Torstensdatter Sogn, age 10 Randi Torine Torstensdatter Sogn, age 9 Mari Torstensdatter Sogn, age 6 Also, Was the following person on the same ship, although he was not travelling with the Sogn's? Ole Gulbrandsen Roisum, age 25, Gran he was later husband of Anne, then Randi The family left Jevanker after Kari's daughter from her first marriage was married on 5 May 1852. They were on a sailing ship, required 8 weeks to cross. Probably landed in New York as they "travelled on a canal to Lake Erie." At least 60 years after this, the youngest daughter of Randi and Ole wrote down what she remembered being told, so considerable important detail is missing. The Bark "Drafna" appears to fit the few known facts listed above.