>diesel ship with solar panels and using the energy to supplement or replace the diesel engines might be a better use of resources? Imagine having the sails be

>diesel ship with solar panels and using the energy to supplement or replace the diesel engines might be a better use of resources? Imagine having the sails be photovoltaic for them to become a dual-energy source themselves. Plus you need more than two ships anyway, at least one for backup if not simultaneous return voyages.