The Saturn 21 was designed as a comfortable small boat for lake areas, which are very numerous in Poland. Positioned as the first yacht for a young family, the Saturn 21 is easy to operate and very stable – this is achieved by the large width of the hull and a high proportion of ballast displacement (when equipped with a regular fin keel).
Despite its modest size, the yacht is well equipped – in addition to a small galley, it even has an isolated latrine in one version of the layout (it had to pay for this with one berth, of which there are four).