MOL Studies Combination of Hard Sails and Rotor Sails for 20% Emissions Reduction 10 August 2022 The combination of the hard sail and rotor sails could reduce the vessel's emissions by as much as 20% on average.Author: Capt. Johnhttps://shipandbunker.com/news/world/641847-mol-studies-combination-of-hard-sails-and-rotor-sails-for-20-emissions-reduction