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lenthomas



Joined: 01 Aug 2012
Posts: 18

PostPosted: Mon Nov 25, 2013 10:22 am    Post subject: Board width question Reply with quote

With two boards of equal volume would the one with a much greater width have more stability ?
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isobars



Joined: 12 Dec 1999
Posts: 14311

PostPosted: Mon Nov 25, 2013 10:32 am    Post subject: Reply with quote

Not counting daggerboards or a huge fin, yes. But stability has drawbacks as our skills improve, so it's not a panacea.
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U2U2U2



Joined: 06 Jul 2001
Posts: 3077
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Nov 25, 2013 11:02 am    Post subject: Reply with quote

2 boards of totally different types , could have the same volume,

one long and narrow

one short stubbie wider new style

which if the case the long one may be more stable, or NOT


I think its to much a generalized question to answer without knowing the boards involved ?

compare it , 2 fins of the same length, but the area , shape is different

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Sailboarder



Joined: 10 Apr 2011
Posts: 443

PostPosted: Mon Nov 25, 2013 11:18 am    Post subject: Reply with quote

If you want to nitpick, you also have to take into account hull shape. Round is faster for non-planing, but very unstable too.

But Iso is right. You want just enough stability, the extra has drawbacks.

I started total beginners with access to a Starboard Start and a Kona One of similar volume. In flat water suitable for beginners, as soon as they figure how to uphaul on the Start, they prefer to switch to the Kona since it has a much better glide due to much less width. It is also less sensitive to steering errors because of the extra length.

If you're asking for kids, too much volume can also be a problem. My 50# daughter was able to go straight in little stretches with a 89l FSW board. On a 139l Go, it was just impossible. The rails wouldn't bite at all and with only the fin providing resistance, the board would aim for downwind in a few seconds.
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U2U2U2



Joined: 06 Jul 2001
Posts: 3077
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Nov 25, 2013 12:38 pm    Post subject: Reply with quote

Sailboarder wrote:
If you want to nitpick, you also have to take into account hull shape. Round is faster for non-planing, but very unstable too.

But Iso is right. You want just enough stability, the extra has drawbacks.



?

Rolling Eyes Question Question

Limit of Positive Stability or LPS is the angle from the vertical at which a boat will no longer stay upright but will capsize, becoming inverted, or turtled. It is also known as the Angle of Vanishing Stability or AVS. For example, if a boat with an LPS of 120 degrees rolls past this point, i.e. its mast is already at an angle of 30 degrees below the water, it will continue to roll and be completely upside down in the water. Most sailboats have lead or other heavy materials in their keel at the bottom of their hulls to keep them from capsizing.

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dennis_c



Joined: 05 May 1998
Posts: 652
Location: Rio

PostPosted: Mon Nov 25, 2013 1:58 pm    Post subject: Reply with quote

IMO for a guy your (and my) size, once you reach 75-80cm there is no reason to go wider. Then, with added length, the board will accelerate more easily (sub-planing) and the resulting added speed will increase stability as well. The transition to planing mode also becomes smoother and easier. This is why the latest Fanatic Vipers, and similar models from other brands, are as long as they are, 75x275 for example. (I still like the idea of a Kona or windsup for long-term fun.)
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U2U2U2



Joined: 06 Jul 2001
Posts: 3077
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Nov 25, 2013 2:43 pm    Post subject: Re: Board width question Reply with quote

lenthomas wrote:
With two boards of equal volume would the one with a much greater width have more stability ?


I am amazed that this question has such varied answers, and interpretation of what boards , quoting widths , and character of different boards.

I want your crystal ball

doesn't take much to amaze me apparently

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beaglebuddy



Joined: 10 Feb 2012
Posts: 710

PostPosted: Mon Nov 25, 2013 4:49 pm    Post subject: Reply with quote

The wider board will have more stability when the wind is less resulting in flatter water but as the wind increases and the water becomes more choppy the wide board will become unmanageable.
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joethewindsufa



Joined: 10 Oct 2010
Posts: 188
Location: Montréal

PostPosted: Mon Nov 25, 2013 5:16 pm    Post subject: Reply with quote

my 160 is 80 cm wide and my 170 is 94 cm wide
both are VERY stable in winds under 20 knots with small chop
they can both handle a 10-oh yet i prefer the 94 cm board with a 66 cm fin
ie semi-formula that planes in about 12 knots and handles large fins with stability Smile

for a completely different animal
my 125 is an older board of 63 cm width
now you can get 125 liter boards of 73 cm width
which one is more stable ??
73 cm will plane earlier and how will it be in big chop ??
yet the 73 cm will handle bigger fins and sails
so, which is more stable ??

it is I who is unstable Very Happy
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U2U2U2



Joined: 06 Jul 2001
Posts: 3077
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Nov 25, 2013 5:39 pm    Post subject: Reply with quote

joethewindsufa wrote:
my 160 is 80 cm wide and my 170 is 94 cm wide
both are VERY stable in winds under 20 knots with small chop
they can both handle a 10-oh yet i prefer the 94 cm board with a 66 cm fin
ie semi-formula that planes in about 12 knots and handles large fins with stability Smile

for a completely different animal
my 125 is an older board of 63 cm width
now you can get 125 liter boards of 73 cm width
which one is more stable ??
73 cm will plane earlier and how will it be in big chop ??
yet the 73 cm will handle bigger fins and sails
so, which is more stable ??

it is I who is unstable Very Happy


all interesting stuff, but NONE of YOUR boards are the same VOLUME

the 125L different animal may be the same question as the OP

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