Calculating board volume (for dummies)

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Michael_A's picture
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Hello gentlemen,

Can anyone suggest how to approximate board volume? I have a high-volume Lost Plank (6'0") and a Stretch Ratskate (6'3") as my bigger wave board ... would love to compare the volumes as they are so very different. My next board may be something in between. Short of finding a giant bathtub, any easy way to come up with some values?

Michael

resinhead's picture
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L x H x W = Cubic Volume


 


I gots me a caculator too!

t3d
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that formula can be only used for shapes such as a cube or rectangular prism.

resinhead's picture
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I know.....I'm such a dick!

Michael_A's picture
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Hmmm .... well .... I think I will see if anyone else replies before pulling out the ol' calculator!

jimithesaint's picture
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Try this:


You can calculate approx volume by:
1/2 length x width x thickness +(10x evry inch over 6')
You get a big number (cubic inches) that you divide by 60.02 to convert to liters.


 


taken from "Red" on KSUSA



Jim

GTFD's picture
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BoardCad or Shape3d lite has a volume read out feature as you input dimensions to picture a board

thirdshade's picture
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get a big bath of water, fill it to the brim, push board so it's completely immersed, catch water displaced and pour into measuring jug...would be more fun using beer...

resinhead's picture
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thirdshade wrote:


get a big bath of water, fill it to the brim, push board so it's completely immersed, catch water displaced and pour into measuring jug...would be more fun using beer...



 


Wait a minute....If my surfboard fits comfortably in a bath tub...then it aint no surfamabord...it's a pool toy. Go look at your bath tub and tell me your board fits in that? 

brian_cab's picture
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The water tank method is a great way to measure the volume and/or determine the bouyancy of a finished board.

Plonk the board into a draft tank, mark the water level and start piling weight on noting the change in level at specific weights until fully submerged.  A simple rectangular volume calculation provides the volume which when converted to cubic feet and multiplied by ~64#s per cubic foot gives you the displacement load.

To calculate the volume from take-offs or drawings of new designs or existing boards follow the link posted in this thread

http://www2.swaylocks.com/forums/surfboard-volume

Which will take you to a page on how to use Simpson's rule which will not be posted here because while easier than intgral calculus, the explanation is still a read longer than a simple post.

Simpson's rule is somewhat more accurate than the rectangle and trapezoidal rules in practical use for me - generally within 5%.

MikeDaniel's picture
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As noted, the easiest thing to do (for most people) is go to boardcad and draw your board as accurately as you can. You can get as detailed as you want - interval thickness and deck dome accuracy will get you a better #.

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