Paul and Laura McMahon's 1978-vintage prototype Puppeteer 22 Shiggi Shiggi leads overall after four races sailed at the Puppeteer National Championships off Howth.
With two wins so far, the McMahons have a one-point lead over HYC Commodore Neil Murphy and Conor Costello's Yellow Peril on five points.
Lying third is Ian Dickson's WeyHey on nine.
The fortieth-anniversary championships featuring a 19-boat turnout got off to a testing start in blustery south-westerlies.
Racing continues on Sunday before a special anniversary lunch and prizegiving.