Ive just bought a 2nd hand board (2014) and there are some inconsistencies with the data (printed) on the board to do with the volume.
The seller advised me of such and indicated that it seemed there was a typo (on the board) so no probs there, Question is how do you measure a board? as I checked the specs on the manufacturers web site theres only 2 cm difference in the length and 1.5 cm in the beam.
So when I put the tape over it 20mm is not much and it varies depending on, if the tape follows the bottom curve? or is the length calculated in a straight imaginary line? There's a fair bit of nose rocker so 20mm is easily consumed if you flatten out the tape. Same problem with the width where is the width measured? at the point where the rails meet the bottom, or at the widest point, imagined through the width of the board?
Any way its perplexing and at the end of the day doesn't really matter as I will just sail it any way.
BTW the volume difference is 10 litres.
Thanks
I've no idea what anybody else does, but I measure length along the rocker line, and width to widest point, (hang a square over each rail and measure between them)
When boards started going wide, early planning ability started to get more dependant on width than volume, so some manufactures took it into their heads to use "apparent volume", ie the equivalent volume to an older board with the same planing ability. Unfortunately this caused a lot of confusion, especially for people who were using volume, to judge how well it would float them in underpowered conditions, as a board they thought should be easy to uphaul would sink under them.
This could easily account for your 10l if it's an over estimate
I am not sure if it is standard practice but I always measure board length as a straight line nose to tail, so putting the board between 2 height posts the distance between the posts and same with the width, to the widest point. Otherwise there are too many variables that will impact these measurements like rocker and rail tuck. Do it this way and you are comparing apples to apples when you measure different boards. It is also what matters when sticking them in a car or van.
With the board that Hoop built me the difference in the length projected as opposed to along the rocker was nearly 25mm. As I gave him a plan view template to cut the foam after the rocker had been cut I had to flat wrap the plan view shape so the board was not too short.
As my boards are designed in CAD the system tells me the volume which I assume is quite accurate. Not such an easy thing to calculate with a complex shape. My experience has been after riding my boards where I am fairly confident in the volume and then boards claiming to be similar is that they generally feel smaller. The trend with most production boards appears to be overstating the volume but this is just conjecture I have no facts to back that up!!.
As mentioned above - length and width should be exactly that, ie; measured in a straight line of the overall dimensions, not following contours. Regarding volume, I'm interested in the method used to determine the difference? The shaper's software should be able to accurately determine the board's volume based on the amount of material (m3) the board consists of after the shape had been determined, but a change in foam type can vary this.
I measured my collection a while ago and noticed a lot of variations, so it's not uncommon. Most seem to be measured along the rocker. Here's the table:
Width was measured at the widest point right out at the apex of the curve of the rail.
That's interesting that they measure around the rocker, shows how much I know!!!! Does not seem intuitive, next Holden we design we will quote length from the back, over the roof and bonnet to the front shall we??
