May be the owner wants to be sure that the main trimmer doing well his job, or maybe he wanted to distract opponents. Who knows !!!
Picture taken on lac Leman during the Genève-Rolle-Genéve (250 boats racing), the warm-up of Le Bol d’Or, Société Nautique de Genève. Boat : Psaros 40, biggest racing monohull on Lac Leman. – Photographer Gilles Morelle.