RE: Double fins?
In the early 1980s there was a lot of experimentation with bottom shapes and what were called 'skegs'. One variant was the 'thruster' consisting of a main fin at the rear and a couple of smaller fins forward. The board turned on the front fins while the rear fin settled the board down. There were even some experiments with four fin boards which did wonders for turns but at the cost of speed especially on flat water. Today there are of course short boards that have short fins. However, as the WS has evolved over the years, may be it is good time for the twin fin to cycle through again; but probably not for those whose first preference is blasting.