Quarter tonner

IOR - International Offshore Rule in the 70s/80s.
Also had 3/4 ton and 1 ton rules. Led to some of the craziest hull shapes and totally nonsensical.
 
http://en.wikipedia.org/wiki/International_Offshore_Rule


some one tonners are quite nice

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/forums/images/graemlins/grin.gif /forums/images/graemlins/wink.gif
 
Wikipedia, it's getting like Google, it's all there!

So it has no actual relationship to boat displacement, just a set of rules to work to (or round)?

Thanks, I was just wondering how they built a 22ft boat which only weighed a quarter of a ton. /forums/images/graemlins/wink.gif
 
Had good fun crewing on an 8 metre this summer. We gave up trying to explain to the punters on board where the ruling came from (in truth the crew weren't entirley sure either) that in the end we just told them that the boats keel drew 8 metres as it was the only dimension they couldn't see.

They seemed quite happy with this explanation!
 
While the above posts are correct, the 'ton' term actually originates from a French race, The Tonneau cup in the very early part of the 20th century, which led to some beautiful boats being created.... it grew as an event, and led via a convoluted path to as said above a range of ratings under IOR in the 70s and 80s
 
That reminds me, up in the side in Burnham is a boat (for sail) claimed to be a 12m? More like 50 foot.

Only saw it briefly so details may be wrong! Definately at Burnham though. How does this work?
 
Not sure she would be a 12m if around 50ft.

I won't lie to you, I don't really have a clue why they are deemed 6m, 8m or 12m. We had a Classic Boat onboard explaining how it works, but I got side tracked by a pasty (it was lunchtime afterall, and it was a good pasty...)

Now Pinuccia is a 8m and is 48ft LOA, 8ft Beam, 2m draft and 68ft mast height.

As far as I'm aware, a 12m is normally around 68-70ft LOA. With a correspondingly higher rig and deeper draft.

What seems strange is that I wouldn't expect to see a 12m in Burnham, as they are such deep draft boats, realistically a little too much for this part of the coast.

Possibly a case of the broker mixing up details? 12m boats, like 8m, are rare, and as you said, at 50ft, she isnt 12m size?

Wouldn't mind taking a look though?!
 
Peter de Savary's old 12m Victory is (or was the last time I was there) ashore at the Burnham Marina.

T'was a pity when they stopped using them for the America's Cup. They had far more style than he current craft.
 
The 12m at Burnham is Victory of Burnham , 19.8m o/a built 1982.
Yes she is a bit deep at 3m for round here.
I raced against her in the local boatyard cup about 4 years ago, bit one sided but at least I can claim to have overtaken her [once, briefly, by a fluke].
 
Rates 12 metres under the old (1906, last amended 1958) IYRU Rule

12 metres = (L + 2d + sq root S - F) divided by 2.37

where L is waterline length, little d is the difference between the girth measured round the surface of the hull and a chain stretched tight round it at two prescribed points, S is sail area and F is freeboard at two defined points.

The IYRU is now the ISAF
 
Thanks. Feel all the richer for knowing that.

So why?

And why call it 12m and not something more abstract?

Anybody around from the 1906 critical meeting?
 
Well, my father was three at the time, but I am given to understand that it replaced the Length and Sail Area Rule:

Waterline length x (sail area squared) divided by 6,000 = Rating

because the Length and Sail Area Rule had produced fin keeled flat bottomed lightweight "skimming dishes" with spade rudders which were found to be unseaworthy. /forums/images/graemlins/laugh.gif

(I'm not making that up - it's from one of Uffa Fox's annuals!)
 
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