A smaller sail plan for the ILCA 4 was developed about a decade later. The sail area was reduced by 35% from the Standard with a shorter pre-bent bottom mast section, allowing even lighter sailors to sail. The same formula as the Ilca 6 is kept. The hull is the same as the Ilca and Ilca. Optimal weight for this rig is 110–120 lb (50–55 kg), thus becoming an ideal boat for young sailors moving from the Optimist/RS Tera, this is better for people who are too big for an Optimist/RS Tera and too light for a normal ILCA.