Volume mystery

[freetobeme]

I have a SUS board that measures 8'8 x 30.5 x 4.5.  When I purchased the board I went looking intentionally for a board that has 125L to 130L. The shop owner told me this board was approximately 126-128L.  I took his word for it and still believe that to be true today.

HOWEVER, I recently emailed the shaper just to confirm the volume. It's a semi custom. He told me my board is 148L aprox.   

That seems like a huge discrepancy!!!

My only reference is my factory board which is 9'2 and 160L. The 8'8 is way less buoyant than the 9'2 for certain! But I don't know what 146L vs 127ishL is supposed to feel like.

I did use this math formula on my own and it comes to 126L

1/2 length x width x thickness +(10x every inch over 6')

For piece of mind can anyone solve this mystery without a van, talking dog and group of slacker teenagers  😳

[stoneaxe]

Got a small pool handy? Only real accurate way is to measure displaced water.

[freetobeme]

Unfortunately, no pool for such a task. I did read that was the way to go. Just hoping to come up with a ball park figure as point of reference.

[mrbig]

My 9'4" Rawson is 147 liters. My 8'2" Rawson is 127 liters. HUGE difference needless to say!

[freetobeme]

Well, those two boards would be a great reference for me. If I could stand on both I could then at least compare them to how I float on my 8'8.

Sounds like a road trip to selachimorpha town.

[Califoilia]

Hmmm, let's look at the video replay.....

You walk into a shop and tell the shop owner you want to buy a board that is 125L to 130L.  The shop owner who wants to sell you a board, miraculously finds one that's smack dab in the middle of your request at 126-128L.....

I have a SUS board that measures 8'8 x 30.5 x 4.5.  When I purchased the board I went looking intentionally for a board that has 125L to 130L. The shop owner told me this board was approximately 126-128L.  I took his word for it and still believe that to be true today.

....."perfect I'll take it".

After purchasing the board, you for whatever reason email the shaper to "confirm the volume".  The shaper, who 9 times outta 10 probably has the CNC computer software that he used to originally "shape" the board....

HOWEVER, I recently emailed the shaper just to confirm the volume. It's a semi custom. He told me my board is 148L aprox.

.....tells you it's approx. 148L.

That seems like a huge discrepancy!!!

No, sounds more like one guy told you what you wanted to hear, and one guy told you the actual number he got when "shaping" the board on his software.

My only reference is my factory board which is 9'2 and 160L. The 8'8 is way less buoyant than the 9'2 for certain! But I don't know what 146L vs 127ishL is supposed to feel like.

I did use this math formula on my own and it comes to 126L

1/2 length x width x thickness +(10x every inch over 6')

For piece of mind can anyone solve this mystery without a van, talking dog and group of slacker teenagers 😳

Probably not, because unless you know all of the cross section thicknesses (the board's "foil") down it's length, and exactly how the nose and tail were pulled in also, it going to be pretty darn hard to get a truly accurate, spot on number....at least IMO.

Just for fun, I've tried to duplicate my boards' shapes using the old, free version of AKU Shaper.....and have never once come even close (within 10L) to what my shaper came up with on volume from the different, really expensive software that he's using.

If I was taking bets....I'd go with what the shaper told you, and not the what shop owner conveniently came up with when trying to sell you a board.

Just my, very unprofessional take on how all of these things work....and what I've "discovered" in the past.  Can you tell I don't trust "sales folks" all that much when it comes to spending my hard earned money on something I plan on keeping for any length of time.

[PonoBill]

Why would it really matter? Your shaper or the shop owner is guessing. You could scan the board and load it into a shaping program which will give a good approximation. You could trace it, draw an inch grid on the tracing, and count square inches, approximating by combining half and quarter grids to get the surface area, then do the same for the sides. You'll get a reasonable number for volume. You could weigh a board with similar construction and known volume and then solve for the proportional volume. You could stack weights on it until it barely sinks, add the weight of the board and solve for volume using 1 gram = 1cc.

Or you could just assume your shaper has done none of these things and is pulling the number out of his butt. 

[freetobeme]

Sano Sup~  I did not mention to the first shop worker (a kid) what I was looking for at all except a sub 9' board. On my own I happened to pick up the 8'8 board and really liked it. Then I searched out the shop owner to ask more about it and how much volume he figured was in it.  Maybe I should have clarified that.

[mrbig]

Call AJ! He might remember..Or not. I had serious difficulties getting an answer from Hobie on an 8'11" Raw now in the posession of the Creekmeister. Does anybody really know what time it is?

More data:
Cannibal Assassin 8' x 30" x 4 1/8" x 126 liters

Cannibal Assassin 8'4" x 30.25 x 4 5/8" x 137 liters

I did a lot of research before plunging in. I also prolly owned more boards that I couldn't ride than ANYBODY EVAH!

[freetobeme]

I emailed him. He said 147L aprox. Only reason I am still asking is because, to me, the difference in float from my 160L board to this board is pretty drastic. Thus, making me question the quote from shaper. 

[mdsurf]

AJ's boards are a mystery in Volume because no two are alike.  Also by my calculations the max it would be is 142 before he shapes it and takes out volume in the recessed deck and the deep double concave on the bottom and heavy v and the chimed rails.  Close guess on his board with these measurements would be around 128- 130 Liters.  Again a guess.  I have called AJ with the same type of question and his Volumes come from his AKU shaper and software and seem to be over stated when compared with dimensions and volume taken out.  I like his boards and his Corevac finish and I like the way they surf.  I just think that they are less volume than stated.  IE.  Got a Sharpe 8.8 x 31.5 x 4.75 and floats me fine, bought a  AJ 8.11 x 31 x 4.75 and did not float at all. Bought a AJ 9.1 x 32 x 4.75 and floats me great (no chimed rails or sunken deck).  The thing is a blast to ride.  AJ does a great custom board too, he uses your height and weight and distributes the foam where you need it.

The only true way to see is use a pool and see how much water it displaces.  But if you are wanting a good guess ... about 128L to 130L on an Assassin model with those dimensions.

[mrbig]

No v. Hull bottom. I saw it with my own eyes!

[mdsurf]

no v- just a double concave bottom with chimed rails.

[mrbig]

Not the hill I want to. .  die on. Bomb not Assassin. Concave innie, convex outtie. Hull round outtie. My MTB quad had one in the eighties. No chine rails. .

[mdsurf]

Sorry I was talking about the assassin not the BOMB.  I have not seen the Bomb. Maybe that is a special NE model... 

 I have bought 5 different models of the Cannibals in the last 5 months and not seen a BOMB.  Surf Hybrid, Assassin, Harrasser, Dagger and Tear Drop. The only other model he has is the Utility.  I was going on the Assassin when I was mentioning the Sunken Deck and the double concave bottom and chimed rails and pulled in tail.  My fault.  I sold the Assassin and the Harrasser but like the other models.  The Assassin did not have needed float for me but was 8.11.  The Tear Drop at 9 foot has plenty of float for me.  Different models and surf different.