3DFins working with Jamie O'Brien have released the Jamie O'Brien "J.O.B" Signature fin. It combines 3DFins dimple tech with their new channel tip innovation. The prototype of this fin was the fin Jamie used to place second in the 2016 Volcom Pipe Pro. Jamie has stated that these new featuring 3DFins tech are "insane off the bottom and amazing in the tube".
3DFINS brought an interesting new innovation to the fin industry when they began testing and using their dimple technology which is based on the distance and decreased drag when in flight experienced by golf balls.
When air flows over an object it can do so via two different methods - laminar and turbulent. Laminar flows are when air connects with a surface that is smooth and has little friction. This results in little initial drag when the air passes over the object. However as the air angles off the object a phenomenon known as "separation" occurs. This abrupt disconnect of air leaves a pocket of empty space behind the object resulting in a low pressure zone that has a slight vacuum effect that actually pulls the object back slightly.
Turbulent flows in contrast occur when air can't travel smoothly over an object and where separation would normally occur, the air is dragged back towards the object. This type of flow has more initial drag but due the air separating closer to the object, the vacuum space behind the object is dramatically reduced lessening the drag it causes. This results in a more aerodynamic object overall. The video at the bottom of this post explains these effects perfectly with simple visuals for further clarification.
Hydrodynamics (aerodynamics for water) operate in the same way. So when water travels over a smooth fin a small pocket of air behind the fin pulls it back slightly. This is where 3DFINS dimple fin technology comes into play. The dimpled surface creates a turbulent flow lessening the vacuum drag caused by the detachment of the water from the fin.
The J.O.B Signature Fin combines this technology with channels carved into the fin tip. These channels help channel water along the tip of the fin, improving hold and drive when going down the line. These channels also aid in release when turning the board as they help break the surface tension of the water allowing the fin to release faster.
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