Small IRC sailboats ???

Are there small IRC sailboats (31-32 ft) near the lower competitive IRC DLR (around 160 -170 with crew) built single skin, not cored.

That shoule be 31-32ft overall, 27-28 ft LWL, around 8000lbs with crew, a little less 7000 lbs empty. And build single skin ?

or scaled up/down (33' loa/ 29' lwl / 9000 lbs loaded/ 7500 lbs empty ) (30' loa / 26 lwl / 7000lbs loaded/ 6000 empty).


NB 7000lbs empty, IRC means at least 3000lbs ballast. So only 4000 lbs left for the whole hull, deck, engine, mast, batteries etc ...

Thanks.

 

It would be fairly suprising if many boats with any pretensions of performance were built single skin these days. Single skin polyester is really not a very satisfactory form of construction.

 

I did not spoke of polyester. Only single skin.

All production mini 6.50 are single skin (polyester). This is a class rule requirement. And they are performance boats.

There is also in IRC a material factor. A single skin boat can be made as competitive as a cored boat (and also cheaper ...) . The current Beneteau First 40CR is build single skin, when the serie was launched as First 40 (no CR), it had a cored hull. Hull material change helped reduce the rating, more than the performance penalty. (And money saved on the hull allowed a lighter 3 spreader rig for the 40CR instead of the 2 spreader rig for the 40).

 

Not many answers.

Surprisingliy, when I look at this kind of sailboats, most are built infused with balsa core. (JBoats j97, jeanneau Sunfast 3200, JPK JPK1010, Beneteau Figaro II[not really IRC]). None is single skin, or with PVC core. I thought balsa was not the best core for a hull ...

Single skin, but not IRC designed, there is the Pogo 10.50. Which is at the same time a little lighter and bigger than the boats above.

So why the balsa choice ? Am I missing something ?

PS Another one I do not know how it is built is the Archambault A31.

 

http://www.fca-marine.com/corby29tr.html

 

Thanks.

But not clear if it is cored or not. On this page : http://microspan.typepad.com/ircboats/specifications-corby-29.html it seems cored. But maybe Corby 29 and Corby 29TR are not the same.

About displacement, 3350kg (7400 lbs) is on the rather heavy side for a 29 footer.

The sunfast 3200 is only 3600kg (7900lbs) for 9.8m 32 ft., Still IRC competitive.

The Pogo is the same displacement, but over 34 ft. Not IRC competitive, but built single skin.

 

Production of the 29 switched from Poland to Turkey, when they also took the opportunity to tweek the design. That website you refer to is for the original version.

Corby boats are way more competitive under IRC than either of the boats you quote. Even back under Channel Handicap, light displacement was never favoured by the rule. John has proven he has a good understanding of what makes his boats consistently good performers under IRC.

 

Way more competitive, not sure. The JPK 1010 is not that bad. Finished 1st and 2nd in IRC3 last Fastnet.

And when you compare the Corby 29 and Archambault A31, you have roughly the same material for both. (3350kg 1250kg bulb ??? kg fin for Corby 29 , 3150 kg 1400 kg ballast A31 T keel). So similar building costs if built same way (Which I guess only, A31 spec does not tell anything about building method, except infusion).
But although a much higher price tag and more recent, there are 6 times more A31 than Corby 29 in IRC listings. So the Corby 29 may be a very good performer, it is the A31 that attracts buyers.

An hypotetical corby 32 would be more comparable in the eyes of A31 buyers (more cruising layout with aft cabin, cat A, etc ..) . But it would be heavier than the A31, and costlier to build. Would customers buy it : not sure, in my eyes performance gain not worth the price. Typical customers do want all, but are not ready to pay for all ...

 

Again, no ideas on lightest (but non unsinkable) category A sailboat, built single skin?

Minimum ISO weight should be 3000 kg (6600 lbs).

 

The first class 8 was single skin, but that boat is a bit smaller than you were looking for. At the very least it confirms what was said about single skin boats being performance oriented.