
No racing was possible at the Olympic regatta on Thursday due to lack of wind, handing organisers a large backlog.
Racing had been scheduled to start at 1 p.m. in the 49er, 470, Laser, Laser Radial, windsurfing, Finn and Yngling classes.
Four races were lost on Wednesday and 15 on Thursday.
Competition officials said reserve days would be used to complete the opening series, which constitute 10 races in all the 11 classes except the 49er class where 15 races are planned. A medal race showdown then takes place between the top 10 in each class where double points are scored.
The Finn and Yngling classes have sailed seven races and will come out again on Friday, originally planned as a reserve day for both fleets.
It was still unclear if all three remaining races in each series will be staged on Friday, one day before the Finn and Yngling medals are decided.
Better sailing conditions are forecast for Friday with winds set to pick up.