The name Medusa is used to distinguish our bags from other types of bags developed.
From 1960 there is the Dunlop Dracone bag invented by Prof William Hawthorne of Cambridge. These bags are very small (1000 – 2000 CM), relatively long and narrow, strong and expensive, designed to be towed at about 8 knots. At this speed the front end lashes around in the water resembling a sea serpent (dracone in Greek). The intended function is to move fuel oil for military use. Some 500 have been made over the years.
The Medusa bag is very different, designed to be much larger, wide, flat and thin. It is towed at low speed (2.5 – 3 knots), without any bow yawing. Ocean swells are absorbed and pass through the bag. In this respect, the bag resembles a gigantic jelly fish. Variants of “medusa” are the names for jelly fish in all the major Mediterranean languages.
Intermediate designs of fresh water transportation bags have been proposed by others. These bags hitched together as a train of many round cylinders. These are towed at an intermediate speed. However, the drag, handling, structural issues with these designs and cost cannot approach the cost efficiency of the Medusa bag.