CLYDE sail-maker Graham Campbell's decisive overall victory in the Sonata class, winning six of seven races, earned him the Scottish Series Trophy last night as the best overall performance of the 231-boat Tarbert Scottish Series regatta on Loch Fyne.

For Campbell's Kooshtie, which has been a consistent victor in the class around Clyde events, winning the class at the Scottish Series has always proven elusive.

Extra speed gained from his latest sail design, and a winter spent racing among some of the class hot-shots in the Lake District proved the decisive winning factor.

''We have definitely learned to sail a consistently good regatta here but we never expected to win the class, far less the main trophy,'' explained Campbell.

Other leading contenders in the running for the trophy included past winner Steve Goacher, who this year won the 1720 Cork One Design Class. Results:

CHS Class 0: Olympic Triangle - 1, Vitric IV (A deMulder) 3hr 31min 53sec; 2, Surfin' Shoes (C Barrington) 3-34.04; 3, Wolf (G Williams) 3-38.54. Overall, including one discard - 1, Vitric IV, 7 points; 2, Surfin' Shoes 13; 3, Crackerjack (K Miller) 14.

CHS Class 1 - 1, Corwynt III (G Evans) 3-37.46; 2, Sloop John T (I & G Thomson) 3-38.21; 3, Playback (K Lawrence) 3-41.20. Overall - 1, Local Hero (G Howieson) 13 points; 2, Mustang Sally (M McMullan) 17; 3, Duckwall Pooley (J Anderson) 20.

CHS Cruiser Class 2 - 1, Be Happy (D & S Urquhart) 3-00.20; 2, Supertramp IV (D Lyons) 3-06.21; 3, Moonshine IV (J & P Fowler) 3-08.32. Overall - 1, Moonshine IV 9 points; 2, Be Happy 9; 3, First By Farr (I McNair) 22.

CHS Class 3 - 1, Wing and a Prayer (G Hughes) 3-00.47; 2, Just Magic (C Frize) 3-01.35; 3, Scenario Encore (T Costello) 3-04.22. Overall - 1 Desperado (J & H Connelly) 11 points; 2, Wing and a Prayer 11; 3, Just Magic 25.

CHS Class 4 - 1, Billy Whizz (H Edwards) 2-15.47; 2, Flash (T Halliwell) 2-16.00; 3, Brightwings (M Ford-Hutchinson) 2-17.29. Overall - 1, Flash 7 points; 2, Brightwings 17; 3, Diamond (G Dawson) 17.

CYCA Class 5 - 1, Crusader (J Corson) 1-46.17; 2, Sea Runner (W Carrick) 1-49.53; 3, Scan (G Aikman) 1-49.54. Overall - 1, Crusader 6 points; 2, Sea Runner 13; 3, Scan 14.

Class 6 - 1, Fumarole (A Malcolm) 1-47.21; 2, Mallie (McClelland and McFadyen) 1-49.34; 3, Siamsa II (P Kelly) 1-56.10. Overall - 1, Fumarole 6 points; 2, Mallie 14; 3, Flying Squad (G Campbell) 23.

Class 7 - 1, Whistler (D Williams) 1-54.49; 2, Bit O'Ruff (P Kiernan) 1-56.32; 3, Lindesfarne II (J Pearson) 1-58.33. Overall - 1, Lindesfarne 12 points; 2, Wild Thyme (D Cameron) 14; 3, Rampage of Lymington (C Rennie) 20.

Restricted Sail Class 8 - 1, Inismara (L Jacobsen). Overall - 1, Inismara 4 points; 2, Diva (C Greenstead) 9.

Sigma 33 Class - 1, Odyssey (H & B Hood) 2-28.59; 2, Carmen (P Scutt) 2-30.45; 3, Boojum (A Hogg) 2-31.55. Overall - 1, Boojum 19 points; 2, St Joan (I Nicolson) 25; 3, Odyssey 25.

Sonata - 1, Kooshtie (G Campbell) 2-50.39; 2, Sarabande (D Clark) 2-51.18; 3, Moonlight (Harris & Hamworth) 2-53.01. Overall - 1, Kooshtie 6 points; 2, Moonlight 16; 3, Sarabande 20.

Cork 1721 Design. Race 1 - 1, Luvly Jubbly (C Lippett); 2, After Midnight (T Murphy); 3, International Yachts (D O'Halloran). Race 2 - 1, Daylight Robbery; 2, Luvly Jubbly; 3, After Midnight. Overall - 1, Luvly Jubbly 14 points; 2, After Midnight 21; 3, International Yachts 22.

Sport Boat, Class 1. Race 1 - 1, Clapped Out Toyboy (I Cleaver); 2, Zip (P Berger). Race 2 - 1, Zip; 2, Clapped Out Toyboy. Overall - 1, Clapped Out Toyboy 10 points; 2, Zip 20.

Sport Boat Class 2. Race 1 - 1, Hitch Hiker (D Wheldon); 2, Twango (P & D Kitchen); 3, Demonstrator (J Blair). Race 2 - 1, Quiet Tango (M Owers); 2, Hitch Hiker; 3, Twango. Overall - 1, Quiet Tango 19 points; 2, Twango 25; 3, Hitch Hiker 28.