Four Union Maritime Tankers to Take on Norsepower Rotor Sails 21 June 2024 The four 18,500 DWT chemical tankers will each be fitted with two rotor sails.Author: Capt. Johnhttps://shipandbunker.com/news/world/506771-four-union-maritime-tankers-to-take-on-norsepower-rotor-sails