We are delighted to receive this week Dr Sergio Perez, PhD, a professor of marine engineering at the US Merchant Marine Academy. Sergio presents an update of a 1975 MARAD (U.S. Maritime Administration) report which concluded that commercial ships using sail power were not economically viable when compared with engine-powered vessels. The 2021 update concludes the opposite: it is economically smart to use sail at this point as a principal means of propulsion. “A slam dunk for the sailing ships, a no brainer with one thing which needs to be addressed: the height of the masts”