Both boats bore the same sail number 8527 of the O'Leary's 'Dafne', the high-end Irish Star that has featured so well internationally this season. They also both featured the decals of leading chandler, CH Marine.
The two boat session in the harbour was some mid-season 'sail testing', according to one of the helms, double Olympian Peter O'Leary.
The tune-up boat was steered by O'Leary's brother, and regular Star crew, Robert.
As Afloat reported already this season, Robert teamed up with Australian Torvar Mirsky to produce a top-class eighth overall at the World Championships in Italy last month and in May, also in Italy, the O'Leary brothers finished 14th at the European Championships.