Let us introduce a new figure to better identify every surfboard potential!

Historically, surfboards have been described by a basic combination of length, maximum width and thickness.
More recently the board volume has been introduced and sometimes used as the main information to choose a surfboard.

Very basic informations indeed… possibly even misleading, when you consider the complexity of surfboard hydrodynamics.

Now, using a different approach supported by the latest CFD technologies, we offer a formula to measure the real
potential of the performance shortboards, for which the planing area is much more important than the total volume.

Using some simple values that any shaper or surfer can measure, the formula provides a number which,
for the first time, expresses how a board actually performs.

We called it the surf-ID.

The surf-ID number, along with usual measurements and general shape informations, will give you a better
understanding of the board potential and personality, making your choice a wiser, smarter and better one.

If you are familiar with volume/litres measurements, you might wonder now how to figure out the correct surf-ID number for you…

It turns out that the surf-ID is more user friendly than anything else you’ve ever learned about surfboards.

For an intermediate/advanced surfer (and up to pro level) the surf-ID number will be quite close to his weight expressed in Kg. (ex. for a surfer weighting 70 Kg. the ideal surf-ID number will be around 70).

The higher the number, the higher the planing potential!

Lesser skilled surfers (and surfers choosing more comfortable shapes) will rely on higher numbers…
Surfboard hydrodynamics are a complex mixture of many variables: lift pressure, water flow velocity and direction; board yaw, roll and trim angles…

When a surfer is actually riding a wave, depending upon his position and line (racing down the line or tube riding, doing bottom or top turns, cutting back, cruising…), different parts of the board are generating the highest lift pressure.

That’s crucial for performance response and prediction!

We analysed all the information and data collected using a virtual simulator (CFD) to dissect the working conditions of a board and highlight the parameters that really affect its planing power.

Then, we linked the pressure areas to the thickness and to a rail factor, to take into account inertial behaviour and rail shape influences.

Finally, we combined all the defined and measured elements into a friendly formula expressing the dynamic planing potential of a given shape.
Let’s take an example here: three performances designs with similar measurements; the board on the right has the highest volume and the one on the left the lesser (they are taken from real shapes).

How useful are these information?
How about the planing potential of each board (speed, acceleration)?

The surf-ID number tells us that is the left board that has the highest planing potential and the right one the lesser (the higher the number, the higher the planing potential)!

The surf-ID formula offers a more accurate and useful understanding on how the board will perform on a wave.
Now, we are not pretending that a single number alone should decide if a surfboard is made for you or not.
This is not possible!

the surf-ID.number makes your choice a better one, by telling how a surfboard dynamically performs!

For those interested in doing the math, here is the formula:

Calculate the surf-ID number of your board

Insert your board data in the form below

remember: 1 foot = 30,48 cm / 1 inch = 2,54 cm

BOARD LENGTH:
the length of your board i.e. 6 feet 1 inch

BOARD WIDTH:
the width of your board in 100/ of inch i.e. 18,75

BOARD THICKNESS:
the thickness of your board in 100/ of inch i.e. 2,25

WIDTH 12″ FROM TAIL:
the width of your board 12″ inch from tail, in 100/ of inch i.e. 14,35

WIDTH 2″ FROM TAIL:
the width of your board 2″ inch from tail, in 100/ of inch i.e. 8,06

RAIL FACTOR:
select a number accordingly to the rail thickness at wide point

Interested? Contact us and ask for more!

Let us know what you think about it, and feel free to share you thoughts and feedback.
Get more information about the surf-ID concept and how to use it.

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