Beneteau 35.1 vs Hanse 348 CE certification

[mglonnro]

Interestingly, the Beneteau 35.1 has a CE A6/B8/C10 rating, where the Hanse 348 has just a CE B8.

Their specifications are pretty close but the Hanse is somewhat heavier. Does anyone happen to have a stability curve for the 35.1?

[fc59]

I do not know the Oceanis stability curve, but I see some points where the Oceanis could have a better Stability Index (STIX).

- STIX is a length. It is roughly boat size against breaking waves size. The base parameter is (LH + 2 LWL)/3. That's why STIX is generally close to the lenght in feet of the boat.
In that case, the Oceanis have a slightly longer waterline. So base STIX parameter slightly higher.

- Oceanis 35.1 is somewhat beamier. 3.72 vs 3.55. So it probably have a better stability at low angles.

- Oceanis 35.1 has a deck built in injection. On typical cruise boats, CoG is roughly 10cm above waterline.
Given the freeboards of theses sailboats, saving 100 to 200 kg on deck manufacturing is like adding 100 to 200 kg ballast 1m underwater.
Which should not be far from the CoG of the keel.

- Oceanis has a smaller sail area. Mainsail 25.75m² vs 34m². Both have similar self tacking jib. Oceanis air draft 15.6m vs Hanse 16.25m. Heeling force in STIX corrective parameters computation is reduced due to smaller area, with a lower center of effort.

- Oceanis 35.1 has smaller tanks. 130L + 130L, Hanse has 230L + 160L tanks. STIX is evaluated in 3 conditions. Empty, fully loaded, and on arrival (kind of loaded, but with tanks near empty). It is easier for the Oceanis to have better STIX. The negative effect of emptying the tanks is reduced with smaller tanks.

For what's worth ...

[mglonnro]

Originally Posted by fc59

I do not know the Oceanis stability curve, but I see some points where the Oceanis could have a better Stability Index (STIX).

- STIX is a length. It is roughly boat size against breaking waves size. The base parameter is (LH + 2 LWL)/3. That's why STIX is generally close to the lenght in feet of the boat.
In that case, the Oceanis have a slightly longer waterline. So base STIX parameter slightly higher.

- Oceanis 35.1 is somewhat beamier. 3.72 vs 3.55. So it probably have a better stability at low angles.

- Oceanis 35.1 has a deck built in injection. On typical cruise boats, CoG is roughly 10cm above waterline.
Given the freeboards of theses sailboats, saving 100 to 200 kg on deck manufacturing is like adding 100 to 200 kg ballast 1m underwater.
Which should not be far from the CoG of the keel.

- Oceanis has a smaller sail area. Mainsail 25.75m² vs 34m². Both have similar self tacking jib. Oceanis air draft 15.6m vs Hanse 16.25m. Heeling force in STIX corrective parameters computation is reduced due to smaller area, with a lower center of effort.

- Oceanis 35.1 has smaller tanks. 130L + 130L, Hanse has 230L + 160L tanks. STIX is evaluated in 3 conditions. Empty, fully loaded, and on arrival (kind of loaded, but with tanks near empty). It is easier for the Oceanis to have better STIX. The negative effect of emptying the tanks is reduced with smaller tanks.

For what's worth ...

Great and valuable insights! Thank you for your comment

I found an excel for making STIX calculations and it seems evident that the manufacturers do not publish enough data for us to make our own (verification) calculations.

Maybe the EU/CE requirements should be amended to require even more standardized info from the builders?

I attach the displacement table that Hanse gives. It would be easy to add some lines to that

[DMF Sailing]

Originally Posted by mglonnro

Great and valuable insights! Thank you for your comment

I found an excel for making STIX calculations and it seems evident that the manufacturers do not publish enough data for us to make our own (verification) calculations.

Maybe the EU/CE requirements should be amended to require even more standardized info from the builders?

I attach the displacement table that Hanse gives. It would be easy to add some lines to that

Don't forget this resource for your comparisons!

Sail Calculator Pro v3.54 - 3200+ boats

[mglonnro]

Originally Posted by DMF Sailing

Don't forget this resource for your comparisons!

Sail Calculator Pro v3.54 - 3200+ boats

Good! I attached a pic from there as well.

It includes a capsize ratio but I don't know if it's better to be big or small

[fc59]

Originally Posted by DMF Sailing

Don't forget this resource for your comparisons!

Sail Calculator Pro v3.54 - 3200+ boats

Beware where the numbers come from.
Garbage In, Garbage Out


The Ocanis 35.1 has only one empty displacement listed : 5966 kg. But 3 ballast weight : 1559 kg deep draft, 1825 kg shallow and 2151 (centerboarder).
The hanse is listed as 6200kg/2030kg ballast or 6500/2300kg in the technical sailplan, hanse site.

You can compare this with the Hallberg Rassy 340. Listed at 5.98t, with 2.3t ballast. In the spec, it is written hand laid hull, with no core.

So the Oceanis hull = 5966-1559 = 4407 kg, with an injection built deck.
The HR 340 = 5980-2300 = 3680 kg. With a hand laid cored deck.

Unless the HR 340 is completely stripped inside, which I do not think , I fear there is something really wrong with these figures.

[DMF Sailing]

Originally Posted by fc59

Beware where the numbers come from.
Garbage In, Garbage Out


The Ocanis 35.1 has only one empty displacement listed : 5966 kg. But 3 ballast weight : 1559 kg deep draft, 1825 kg shallow and 2151 (centerboarder).
The hanse is listed as 6200kg/2030kg ballast or 6500/2300kg in the technical sailplan, hanse site.

You can compare this with the Hallberg Rassy 340. Listed at 5.98t, with 2.3t ballast. In the spec, it is written hand laid hull, with no core.

So the Oceanis hull = 5966-1559 = 4407 kg, with an injection built deck.
The HR 340 = 5980-2300 = 3680 kg. With a hand laid cored deck.

Unless the HR 340 is completely stripped inside, which I do not think , I fear there is something really wrong with these figures.

We have had at least one thread where everyone laughed at these numbers. But what's an internet forum without spreading a little nonsense?