I have been told by a good source that the volume of a sup (as displayed) is the volume of the board which is under the water line and NOT the overall volume of the board (without rider). Is this correct ? I have heard a few different theories.

Scotty88 said...

I have been told by a good source that the volume of a sup (as displayed) is the volume of the board which is under the water line and NOT the overall volume of the board (without rider). Is this correct ? I have heard a few different theories.

is that saltwater or fresh water.

i think someone is pulling your leg



never hear of any shaper i know talk about that.

volume is normally taken from the the boards program files

cheers

Got this off a website called www.boardformula.com

6)Volume is a measurement of how much water the surfboard displaces. If the volume given has an asterisk(*), that means it was calculated, not measured, therfore this calculation can have an error up to 1L. The measurement is the same in both salt water and fresh water. When you are sitting on the surfboard in the water, the board can hold up as much weight as the weight of the water it displaces. Salt water weighs about 2.26 lbs per liter. So if your board displaces 30 liters, the buoyant force will be 68 lbs. Volume only matters when the board is displacing water. When the surfboard is moving fast, it is on top of the water and displaces a tiny amount of water. At high speeds, surface area and rail outline matter most, volume has little significance.

Hope that helps.

Here's a couple for you...

Would a board filled with foam or air displace more water?

If the board was filled with air under preasure, would it displace more water?

Scotty88 said...

Cheers Adapt,
The guy I spoke to mentioned he didn't take much notice of volume as there are to many variables involved. Such as riders weight,etc.

Well thats not going to help people choosing the correct board is it.

Scotty88 said...

Cheers Adapt,
The guy I spoke to mentioned he didn't take much notice of volume as there are to many variables involved. Such as riders weight,etc.

In some ways this comment is correct as volume total can be squeezed in many directions and simply is an indication of how many liters are contained inside the board total ie as Jonathan said cubic volume.

Thing is say for example a 100 liter board could be anything from a 12' x 24 tipoff master or an 8'4 x 30 chunk city. It really is just an indication and you'd be better looking at where the volume is placed and only ever considered in relation to other more important measurements. People only started thinking of these numbers in surfing once the AKU machine started calculating liters correctly for surfboards, boards worked just fine before that also.

Scotty88 said...

I have been told by a good source that the volume of a sup (as displayed) is the volume of the board which is under the water line and NOT the overall volume of the board (without rider). Is this correct ? I have heard a few different theories.

Pure, golden, prize-winning BULLSH1T.

the volume of the board (in liters) which is under the water line (without rider) is of course... the weight of the board (in kg). (less some percent due to salt water density).

The Volume of the board is the volume of the board. Some manufacturers can get it wrong (most because they trust the one printed by their CAD software, not taking into account the volume modifications induced by finishing and glassing). The pad also adds some liters.

CMC said...

Scotty88 said...

Cheers Adapt,
The guy I spoke to mentioned he didn't take much notice of volume as there are to many variables involved. Such as riders weight,etc.

In some ways this comment is correct as volume total can be squeezed in many directions and simply is an indication of how many liters are contained inside the board total ie as Jonathan said cubic volume.

Thing is say for example a 100 liter board could be anything from a 12' x 24 tipoff master or an 8'4 x 30 chunk city. It really is just an indication and you'd be better looking at where the volume is placed and only ever considered in relation to other more important measurements. People only started thinking of these numbers in surfing once the AKU machine started calculating liters correctly for surfboards, boards worked just fine before that also.

Correct, you guys should just start the "Just ask CMC" thread

doggie said...



Correct, you guys should just start the "Just ask CMC" thread

Now you're talking, I could talk crap forever.