Well not exactly. The flat top debut at lake cootharaba was in 1988 was built by Ryan sails with Barry Marmion inspiration and helm. It had a conventional boom with gooseneck at deck level so wasnt a true decksweeper. Came second. Greg copied the square top and most of the fleet swapped in 1989 at Belmont. First DS with wishbone boom on A I recall was by Tim Daddo of Macquarie Innovation fame about 10 years ago. Glenn joined greg in mid 90s as apprentice was given a hand me down A (a pig of a boat aptly named, Its life Jim, But Not As We Know It) and won the first A regatta he entered, the worlds.
There endeth the lesson WnW