Hi Guys,
I have two windsurf freestyle boards:
1. 107 Litres, weight 8,3Kg (length 228cm width 64,5cm)
2. 103 Litres, weight 6,9Kg (length 234cm width 64,5cm)
Which one has more flotation?
Thank you,
103lt should, but depends how board was measured in first place because volume should take into account weight of board.
manufacturers can do some odd things though
My personal feeling on the water, is also that the 103Liter carries more Buoyancy.
These volumes are the quoted volumes by the manufacturer.
Though I've inserted it in Shape3D, making a replica board and get 104 litres for the "103 liter board" and 105,56 litres for the "107 liter board".
I always thought that the volume quoted in boards is exactly the volume of the object, independently of its weight.
Though I know manufacturers maybe for marketing reasons slightly change the volume of the board, instead of the volume you get in Shape3D or any other CAD designer.
"107-8.3=98.7 103-6.9=96.1 The first has 2.6L more" is also a typical reasoning, but i remember someone told me that in this case of surfboards it isn't exactly that linear.
Its never exact as they make late changes, and also love to have a waveboard that "planes earlier than its 105L would suggest..." in magazine reviews etc.
Further, how often are you stationary? Stability created by forward motion is relevant.
So is rail shape for lateral roll resistance.
So thinking that 4L difference might make a difference is very flawed.
But yes if those figures are correct then of course the one with 4L more and only 1.4kg heavier has more float. But its semantics as its not that easy for the reasons above (and prob many more...)
agree with mark.
also the extra length can feel more stable. to get around that with shorter boards I feel more balanced putting the mast at the back of the track
Select to expand quoteGestalt said..
103lt should, but depends how board was measured in first place because volume should take into account weight of board.
manufacturers can do some odd things though
Apparently not. ( Takes into account of the actual board weight ).
These days when they design a board it is the volume of the foam alone. This is done as companies often offer various construction methods, therefore they have the one shape that comes in at different weights. Thats according to lots of shapers.
Volume also doesn't take into account for width, distribution etc so a wide board will support more weight but can have the same volume as a narrower board.
In the old days they used to actually put them in a tank with weights on them and see when it started to sink.
Sometimes too, like Mark said, they often talk volume down so the sailor things that his 88 litre board can hold a bigger sail and then think what a great board it is when its actually a 90 litre board.
The 107 in theory should be more floaty as theres only 1.4kg difference in weight but 4 litres difference, they are both the same width, also would depend on where the volume is placed within the boards, one may have a really thick tail etc. Also the extra length should in theory create more glide but that also depends on rocker, fin placement, Nast track position, the list is endless.
Best to just go out and sail them and see which one works best for you.
Select to expand quoteStralen said..
My personal feeling on the water, is also that the 103Liter carries more Buoyancy.
These volumes are the quoted volumes by the manufacturer.
Though I've inserted it in Shape3D, making a replica board and get 104 litres for the "103 liter board" and 105,56 litres for the "107 liter board".
I always thought that the volume quoted in boards is exactly the volume of the object, independently of its weight.
Though I know manufacturers maybe for marketing reasons slightly change the volume of the board, instead of the volume you get in Shape3D or any other CAD designer.
"107-8.3=98.7 103-6.9=96.1 The first has 2.6L more" is also a typical reasoning, but i remember someone told me that in this case of surfboards it isn't exactly that linear.
8300/107 = 77.57gr/lit 6900/103 = 66.99 gr/lit gives you a more clear view.
If you have it in Scan 3D you have the data you need to do a planing? buoyancy curve which gives a good view of board feel.
Divide board length into 10cm sections, measure planing widths at each point and get an average width for each section.
Get the volume for each section (width x thickness x 0.848) from this you can get litres/cm2
Excel to do the calcs.
As others mention the manufacturers fudge some and the best I've seen was the Fanatic FW 85 of 2004 which planed very early and all were impressed.
It was actually 93 litres as was confirmed by the German WIndsurf mag tank test.
