Continuing down the line of surfboard design, we get to 1967 & the twin keel Lis Fish.  Originally a kneeboard design for San Diego slabs its become more known as a groveler, but extreme speed lies in its stout outline.  MR gave the twin a moment in the sun, but the thruster quickly usurped it.  Over the last 50 years its been refined by the cult of the keel and continues to be a craft of choice for those drawing creative lines.