3D Fins Tri Small Full Base - Blue Metal
MOONRAKERR XS Full Base
Super Groms, this fin is for you. It's super fast, super responsive and super fun. If you're looking to add a bit more speed and power to your turns this awesome design, combined with dimple technology is made for you. The sky is calling!
The MOONRAKERR™ has been designed to give extra speed and drive both down the line and through critical turns. Computer Flow Dynamic tests have proven the dimples on the MOONRAKERR increase lift and drive significantly. This gives a surfer the ability to gain more speed, and with more speed comes the opportunity for more advanced manoeuvres. Constructed in Fiber Reinforced Thermo-Polymer Composite.
As we all now know, a golf ball with dimples will fly further than a golf ball without. What most of us don’t know is why? There are two main reasons:
- The Dimpled Surface reduces drag.
- The Dimpled Surface improves lift.
First a quick lesson in hydrodynamics (aerodynamics).
There are two types of flow around an object: laminar and turbulent. Laminar flow has less drag, but it is also prone to a phenomenon called “separation.” Once separation of a laminar boundary layer occurs, drag rises dramatically because of eddies that form in the gap. Turbulent flow has more drag initially but also better adhesion, and therefore is less prone to separation. Therefore, if the shape of an object is such that separation occurs easily, it is better to turbulate the boundary layer in order to increase adhesion and reduce eddies (which means a significant reduction in drag) Dimples on golf balls turbulate the boundary layer.
So we at 3DFINSCIENCE decided to test these principles and apply them to a surfboard fin. With advanced Computer Flow Dynamic testing 3DFINSCIENCE compared two identical fins: the MOONRAKERR dimpled fin and the same fin without dimples. The tests were conducted by flow dynamics expert Darrin Stephens (formally of CSIRO) and the results were surprising. A surfboard fin with a smooth surface is much like a golf ball with a smooth surface, it has a lamina flow over the surface. This works quite well when going straight and at lower speeds, but when you start to turn and reach higher speeds the fluid starts to separate from the foil or fins surface.
A surfboard fin with dimples creates a turbulent flow. Turbulent flow has more adhesion so when you start to turn, the dimpled fin surface delays the flow separation, reducing cavitations (the separation bubble) allowing the foil to maintain performance. When the surfer is turning at high speeds, the turbulent boundary layer helps the flow overcome an adverse pressure gradient and allows the fin to remain attached to the surface longer than it would otherwise. This reduces drag, increases lift and improves overall performance of the fin design.
- Base: 4.26 in, 108 mm
- Height: 4.22 in, 107 mm
- Area: 13.03 sq in, 8405 sq mm
- Sweep: 32.3°
- Foil: IFT
- Size: Medium
- Fins in set: 3
- Mount: Futures
If you are not 100% satisfied with your purchase you may return it for a full refund, or exchange within 30 days of receiving your order.
Returns are easy! We understand that in some situations returns or exchanges may be necessary. We also want you to be stoked on your purchase. If you are not 100% satisfied with your purchase you may return it for a full refund, or exchange within 30 days of receiving your order. Items must be in new condition with original tags and packaging.
Please make sure your wetsuit fits before taking it in the water. We are not able to take returns or exchanges on used wetsuits.
Please reference our full Return Policy.