Line up of some TM speed fins. Left is 1990 alloy 20cm assy. A magic fin that is still good for well in excess of 40 knots. Next are TM45 v4, v3 and v1 protos. v1 went almost 44kts for me, v2 and v3 are nicer to ride but I think the best they went for me was in the 42-43 knot range just because I didnt have the magic day I had with the v1.
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