Vortex generation producing surprising speed.
olo SURFER.com
The D  11-9  is an all round surfboard, with an easy carving  ability, great wave catching and paddling power, stability, and a surprising turn of speed.   Here the board is out for a casual romp among the pigeons,  retro fitted with the new bulb tipped carbon fibre flex fin, which works perfectly with the vortex generating 8 inch diameter tunnel fin. Power surfboards have pioneered this fin combination, which is a quantum leap ahead in drive and drag reduction.
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