Board quoted size VS how it sails

U2U2U2 · Posted: Thu May 07, 2015 5:55 am Post subject: Board quoted size VS how it sails

my one board is quoted at 99liters,compared to my 88liter, it feels more like lo 90s in size. Variables abound as both 'could' be + ~ of the actual volume.

So if the board is shaped on a CAD/CNC Concept rather than hand done, why would the quoted volume be so far off??

Most websites of boards, have a + ~ volume disclaimer in %

So why using computers and machines are the % so widespread ?

kmf · Joined: 02 Apr 2001 Posts: 503

Quoted volumns and perceived volumns are two completely different things.

A friend and I have talked about building a tank to measure actual volume of a board, which would be an interesting project. We haven't done so at this point, but it would be cool.

KMF

U2U2U2 · Posted: Thu May 07, 2015 10:44 am Post subject:

Understood, I think.

Somewhere a base line exists in everyone's thoughts,

So some board does sail like its quoted volume, and in reference to that, everything else is near its quoted liters or not.

I suppose if everyone used the same math/test to determine volume they may be closer.

I reckon a tank would disclose something, but now knowing what much good is it ?

kmf · Joined: 02 Apr 2001 Posts: 503

Volume is the one variable that we can't measure ourselves, and although it is the first thing that we think about when we are looking at a board, we don't actually know if the numbers on the board are correct. This is expecially true for custom boards.

I suspect that production boards are close to their advertised figures, but it would be fun to actually know, as then we could have another number to put into the puzzle of what is the relationship between board shape and volume and thus what really works for us.

KMF

isobars · Joined: 12 Dec 1999 Posts: 20935

Boards Magazine tried for many years to come up with a meaningful way to relate volume to performance/behavior for today's shortwide boards. They gave up.

Sailboarder · Joined: 10 Apr 2011 Posts: 656

Volume is usefull to figure out if you board will sink when you are on top of it and stopped, or schlooging slowly.

Otherwise, it's a quite a useless measure for planning windsurfing. Volume is not quoted for waterskis and wakeboards... Width makes more sense.

dllee · Joined: 03 Jul 2009 Posts: 5329 Location: East Bay

Design affects how a board sails, while volume is only static float.
Planing is affected by design.
And why would a Cad designed board know it's volume? Cad didn't glass it, didn't add pads, and doesn't know if the Thai manufacturer copied the mold exactly, does it?

U2U2U2 · Posted: Thu May 07, 2015 6:02 pm Post subject:

A computer designed board , was told by a human what the size will be machined to.

Width is probably the better guide guide than volume. The all the things like 2cm planing flat, nose, tail width , bottom shape, rails all effect the planing
Potential .

A human or machine made a decision to make a 99 liter board , so why does it feel like not 99 ?

westender · Joined: 02 Aug 2007 Posts: 1288 Location: Portland / Gorge

Gotta pay attention to the Volume so you don't sink. Everyone asks me the volume of my boards, I say I don't know but it's just right.

dllee · Joined: 03 Jul 2009 Posts: 5329 Location: East Bay

U2, while I human might plug in 99 liters, the machine translates the need for certain flow and thickness, uses compensation to compromise, the blank is then glassed and tested, then sent to Thailand, Italy, or Tunisia to be measured and molded, then the actual manufacturer compensates as needed to fit his machines, glass schedules, pads, and release ease, and the final product comes out, oftentimes at least 4 liters different sizing than the original plug.
You talk theory.
We live in a practical world.