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Old 21st June 2012, 07:34 PM   #11
Sailboarder
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You are right, I meant distance between mast foot and fin.

You are also right that I am simplifying. However, my take is that I will choose sail size first according to the wind. Theoretically, fin selection would be second, depending on the water state and ride objective. The smoother the water, the faster I'll go, and the smaller fin I will use. If I had a big quiver, board selection would be last step. Enough mast-foot to fin length to cover well my sail, enough width to make sure I am not overpowered by the fin, but not too much width to loose traction all the time due to chop.

Volume itself is important only if uphauling is required. Weight + 30l in my case for easy success. Volume is also practical to describe the boards since it cover both width and length in a single number, but it is not accurate at all. My Kona One behaves roughly like a 135l board but is 220l. The critical measurements are the same however.
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Old 29th July 2016, 01:26 AM   #12
llsk
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Smile It's about time!

Quote:
Originally Posted by Unregistered View Post
Mr Average weighs around 75kg.. In an attempt to sell as many of any individual board as possible ALL boards are designed with this in mind. The further you stray from being Mr Average (in weight) the harder it is to find a board that works for you in conditions you sail.

Unfortunately the situation is endemic. Most will tell heavyweights they need "more skill" (to uphaul/gybe/wave ride etc etc) but in reality they simply need more volume.. Reserve volume is even geared towards maintaining this BS... Its a ridiculous concept.. Imagine an oil tanker with 10 litres reserve volume...It would be sinking... A duck on the other hand floats happily with lots less than 10 litres reserve volume...Afraid all our sport is based on psuedo science... The manufacturers cant even (or wont)quote real volumes; in this way they are allowed to manipulate all us naive sailors into buying this years trend/revolution/wide board/tri fin/quad/ etc etc .. All we really need is a board that floats us and planes when its windy; gybes when we need and jumps when we want...But we are all victims of sponsored sailors/flashy magazines/sails patter and end up with 4 boards (3 of which are basically too small) ; 8 sails and 4 masts...

Oh and its fashion to sail a board thats too small... Go to any venue and everyone does it..Its not cool to sail a board thats big enough for you dude...
Finally someone gets it!
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Old 2nd August 2016, 08:03 AM   #13
joe_windsurfer
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on a long n narrow longboard, one has more than say 180 liters - will float almost anyone
often they had US fin boxes where fins were no longer than 30 cm or so
{without getting into the area n thickness of fins...}
these boards can handle sails from 5.0 to 10+ m²
this seems to have nothing to do with volume nor fin
just the nature of the beast

what about short boards ??
i always thought it had more to do with fin/sail size combo
volume for flotation as someone suggested
{assuming we longer speak about "virtual volume}
on a short board we speak about OFO/"one foot off" from the tail
this has been found to restrict maximum fin length
a formula board can be about 80 cm OFO and they use 77 cm fins
Roger once suggested to me NOT to use fins less than 1/2 the OFO
so, half of 80 cm is 40 cm which suggests about a 7 m²
thus we have a sail range of 7 to 12 meter sails
typically the low end is pushing it (1/2 OFO)

Carve 131 has a tail width / OFO of 47.5 cm
SB suggested fins are 36 to 42
and i am guessing you can put a 48 cm fin for that 8-oh
for OFO - fin range is 24 to 48
again the low end seems to be pushing it and 36 to 48 makes sense
for me this translates to about 6.x to 8.x sails
SB suggests 5.0 to 8.0

what you use for your weight n skills in terms of sails, is your business
a 100 kilo sailor should be able to uphaul on a 130 liter board - perhaps with some technique
150 pounds which is ~70 kilos should have NO issue uphauling on such a board
whether sail should be a 5-oh or an 8-oh depends on wind n skills
70 and 100 kilo sailors can use 5-oh and 8-oh sails depending on wind n skills
with a NICE board like a Carve 131 skilled sailors are probably beach and water starting - NO uphauling

in any case, that's how i look at volume, sail size, etc ...

at about 105 kilos I often sail a Mistral Equipe II XR
never worried about being cool
the cool cats are foiling on kites :-)
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2012 JP SLW92, 2013 AHD SL-2 132, 2000 Fanatic BEE 124 LTD + Mistral Equipe II XR (Mistral SLE303 to beat up)
HSM Fire 6.3, NS Duke 6.9, TR-6 8.4, HSM SPF 8.5,TR4 10.0

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Last edited by joe_windsurfer; 2nd August 2016 at 08:23 AM.
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Old 3rd August 2016, 12:08 PM   #14
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Can I use a carve 131 with 5.3 - 7.5 at 150 lbs? I would like the extra volume for uphauling in slop and safety in dead zones with offshore winds on freshwater, but it seems everyone is pushing me towards lower volume.
YES, you can! Anything is possible in this sport, havent you realized?! Will you like it? Probably. Will you still like it after a couple of seasons? I doubt. Your skill will increase, the experience gained of the many sessions spend on this board will open your eyes to its limitations and youll be ready to move on-thats called a naturall progression and there is nothing wrong with that.
[QUOTE] Why are board volumes decided by sail range and not body weight? [UNQUOTE]
Because body weight determines the sail size and the board shaper suggests the appropriate volume for that sail size. For example: you need a board for 10-20 kts wind range which for an average weight person will be something like 7.5 and 6.5 sails. You are an early intermediate and you are looking at the Carve 121-5.0 to 8.0 sail range. Which means 6.0 and 7.0 will be the optimal sails for this board. If you sail mostly the 6.5 go with it, if you sail the 7.5 mostly go with the 131. For that wind range if you are advanced level and you are looking at Starboard AtomIQ -a performance board- you'll choose the114L.
Now what will be the difference if you have several windsurfers with different weights? Well every one of them will choose diferent combination of sail sizes for that same wind range-the heavier ones will go for 7.0-8.0 and the lighter ones for 7.0-6.0 and then will choose the appropriate board volume acording to the shapers recommendation.
The system is proven and it works great, but you need to understand it. Maybe there should be instructions link posted next to the spreadsheets or something.
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Old 3rd August 2016, 12:30 PM   #15
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PS: It is a lot like choosing a pickup truck. You know what weight you are going to tow and you choose the optimal engine to do the job. Based on that info the manufacturer recommends the size of the cab that will best accomodate that size engine and the rest of the hardware, giving you several variations to choose from. In windsurfing this translates to you choosing the sail that will do the job for you for a specific wind strength and the shaper recommends you the best model for the conditions you are sailing in /the terrain you are driving on in truck analogy/ and the best volume for that sail size. Get it ?
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