Why is it that boards and there dimension's change to a narrow mid section

I.E lets say a 9 ft board is 29 or 30 wide, Now there is 9'6 and 9'8 boards but only 28 wide.

I always thought the width was of most importance, But it seems that length is also just another way of making a sup stable

I.E 9'8 but 28 wide , In turn making is as stable as the 9 x 29

I could be fully wrong here but this is what i keep seeing

So, at the end of it all length = glide but almost always at 28 wide or 28.5

Or loose glide and add 29 or 30 wide, But both boards being just as stable as each other just different aplications for each.

www.breezysea.com.NZ .... There's a thought

Hey Boarders,

I don't think you'll find that much stability in length and I would hazard a guess that boards are getting narrower due to progression and demand?

There are plenty of boards in the 9'-10' length with the mid section at the width you require; Naish, Coreban, PSH, C4 but to name a few.

Or how about getting in touch with this fella http://www.supersession.co.nz/ ok the web page probably needs updating a little but he is apparently making really good customs. I have it on good information that he made Dave rastovichs' dad a SUP similar to the Sub vector only a lot wider last year.

My view, as it applies to surf where I live.

Narrow and longer handles speed better in bigger waves. The more parallel template feels stiffer turning and "locks in" when going down the line. Ideal for certain type waves.

Shorter and wider feels looser, more stable, but reaches top speed earlier and can feel draggy when the wave is too big. Short and wide makes the template more rounded, and thus more loose.

For the type wave where I surf, wider and shorter is more fun, most of the time.