WindFX 2.7m, 6.25 m Aerotech, 23 cm Clifford kick-back alloy weed fin. Travelling south on my sailing cat, anchored in Pancake Creek 30nm from Gladstone for 2 days. Sailed in 15-20 knots, very shallow, fairly flat water, would loved to have had a bigger sail for bearing away. Hit the bottom at speed about a dozen times and fin kicked back successfully and kept sailing without spinning out.