Powerful hull shape ?

[srah1953]

Indulging in some boat porn from Dusseldorf. A Yachting World video on a new Bavaria talks about it having a powerful hull shape, referring to its wide stern.
What does this mean?
PS Excuse my ignorance. I used to be more knowledgeable but age has diminished my brain cells.

 

[Norman_E]

Sounds like journalist speak for "we have to say something nice about a hull shape designed for accomodation needs".

 

[Laminar Flow]

Indulging in some boat porn from Dusseldorf. A Yachting World video on a new Bavaria talks about it having a powerful hull shape, referring to its wide stern.
What does this mean?
PS Excuse my ignorance. I used to be more knowledgeable but age has diminished my brain cells.

Yes, the yachting press trying to talk up something that has been around for ever, see American cat boat. Beam equals stability, hence power to carry sail. It also makes a boat uncomfortable in a seaway, unbalanced when heeled, hence the need for twin rudders these days, equally stable whether right way up or upside down. Wide beam and light displacement are the greatest contributing factors to capsizing (Brewer, Marchaj).
Wide at the stern, to keep entrance angles down and still have all that room under the cockpit for twin stern cabins. For marketing purposes it also conveniently mimics the current crop of offshore racers.

 

[pvb]

The Bavaria C42 also has chines, which I don't think Bavaria have put on a sailboat before. These can add to stability, as well as helping maximise accommodation. It's a good-looking boat, and very keenly priced.

 

[Laminar Flow]

The Bavaria C42 also has chines, which I don't think Bavaria have put on a sailboat before. These can add to stability, as well as helping maximise accommodation. It's a good-looking boat, and very keenly priced.

Chine would move buoyancy outboard (and create even more space inside); I saw someone claim that, as the chine immersed, it helped alleviate weatherhelm and keep the lot on track.

 

[dunedin]

The wide beam provides extra righting moment and hence can car more sail for a given wind strength and ballast weight, hence “more powerful”.
Done well can also make a more comfortable boat downwind, the direction many prefer to travel, unlike many narrow sterned boats from the 1970s and 1980s that often copied IOR race boat styles, and some of these can roll horribly downwind.
Wide beam can also be fast upwind (see similar race boats), but can also be more bouncy and risk slamming in waves.

 

[johnalison]

Beam doesn't invariably lead to a powerful boat. My old Sadler 29 was an excellent boat in many ways but in spite of being fin-keeled its slab sides meant that reefing had to be done early, though not excessively so. My friend's Bav 34 from 18 yrs ago had to start reefing at abut 8 knots less wind than my slightly smaller HR34 in spite of being similar in measurements and sail area, and the HR having next to no form stability. The newer boats, being like oversized dinghies, probably can carry a lot of sail and can reasonably be called powerful, even allowing for advertising hype. Whether they are nicer to sail or make better cruising boats is a different matter. My feeling is that the new style works better for the larger boats.

 

[Daydream believer]

deleted

 

[coopec]

Boat Hull Types & Designs

Boat Hull Types, Designs & Explanations | BOATERexam.com®

 

[Laminar Flow]

Nice, and now boys and girls ....

Boat Hull Types & Designs
Boat Hull Types, Designs & Explanations | BOATERexam.com®View attachment 84615

Lovely.