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  #5751  
Old 01-15-2014
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Re: Rounded bows

Quote:
Originally Posted by PCP View Post
There are some considerable differences regarding the jK team Origin TP52 bow and the one from Verdier on the Pogo 3:
What's the reason behind the fat bow, Paulo?

In extreme form, it kinda reminds me of this:
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Last edited by Classic30; 01-15-2014 at 10:20 PM.
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  #5752  
Old 01-15-2014
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Re: Rounded bows

Quote:
Originally Posted by Classic30 View Post
What's the reason behind the fat bow, Paulo?
...
Yes, I have posted before some older Portuguese sailing boats with rounded bows, in fact I have read in an old treaty that the rounded boats were a big improvement

The rounded bow gives more power to the boat (hull form stability) and in big seas, with the boat running adds buoyancy to the bow preventing it to dig the bow on the waves.

Regards

Paulo
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Last edited by Faster; 01-15-2014 at 11:32 PM. Reason: fix quote
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  #5753  
Old 01-16-2014
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Re: Rounded bows

Quote:
Originally Posted by PCP View Post
...
Yes, I have posted before some older Portuguese sailing boats with rounded bows, in fact I have read in an old treaty that the rounded boats were a big improvement

The rounded bow gives more power to the boat (hull form stability) and in big seas, with the boat running adds buoyancy to the bow preventing it to dig the bow on the waves.
Thanks, Paulo. That makes sense to me.

It's interesting to me that NA's now are starting to realise - the hard way - that many of the old ways were not always complete rubbish to be tossed in the bin.. even if the designers from centuries ago did not always completely understand why what they had designed worked.

eg. Apparently the replica of ENDEAVOUR (the ship in my post) was a surprise to many that when she was launched it was discovered she didn't sail like a pig!.. She's since circumnavigated the globe at least once and is apparently happiest in big seas.
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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"

Last edited by Classic30; 01-16-2014 at 03:02 AM.
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  #5754  
Old 01-16-2014
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Re: Rounded bows

Quote:
Originally Posted by PCP View Post
...
Yes, I have posted before some older Portuguese sailing boats with rounded bows, in fact I have read in an old treaty that the rounded boats were a big improvement

The rounded bow gives more power to the boat (hull form stability) and in big seas, with the boat running adds buoyancy to the bow preventing it to dig the bow on the waves.

Regards

Paulo
... And lifts the bow on a reach to plan earlier...
And on a close haul the bow is less 'dipped in' by the broad stern... The waterlines in a heeled situation is less - how to say - offline... But more in line with the course the boat is going...
There are a lot of merrits to a fat bow, but the main reason is lift to plan...
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  #5755  
Old 01-16-2014
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Re: Rounded bows

Quote:
Originally Posted by capt vimes View Post
... And lifts the bow on a reach to plan earlier...
And on a close haul the bow is less 'dipped in' by the broad stern... The waterlines in a heeled situation is less - how to say - offline... But more in line with the course the boat is going...
There are a lot of merrits to a fat bow, but the main reason is lift to plan...
Nobody is more linguistically impaired than I am, when it comes to languages other than English. However, I'd like to call attention to a recurring spelling error that some of the posters make quite often in this thread.

When a boat attains sufficient speed and lift to break free from the limits of displacement sailing, the correct term to use is: "plane" or "planing"

The words "plan" and "planning" refer to the making of arrangements or contingencies -e.g., "I am planning a cruising vacation in Turkey this summer." Or "I don't know what I'm doing this summer as my wife is the one making the plan." "Plan" can also refer to a diagram or schematic, as in its use in the expression "plan form" - i.e., a graphical rendering of a particular yacht design.

I apologize for playing spelling policeman but hopefully nobody will take offense, as that was not my plan.

However, since English is such a ridiculous language, I should probably note the words "plain" and "plains" - the former means "ordinary or non-descript" while the latter refers to extended flat landscapes.

Again, I beg forgiveness for this brief spelling lesson. I was an English teacher at a very early stage of my career, so it is a difficult habit to break.

I now return you to our regularly scheduled discussion of interesting boats, already in progress.

MrP
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  #5756  
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Re: Rounded bows

Quote:
Originally Posted by MrPelicano View Post
...
I apologize for playing spelling policeman but hopefully nobody will take offense, as that was not my plan.
...
... no offense taken...
rather the contrary - i appreciate any correction because it allows me to learn...

so - a plane lands plain in the plains according to the plan but if a plane planes planned on plain water, is it still just a plain plane?
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Last edited by capt vimes; 01-16-2014 at 08:55 AM.
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  #5757  
Old 01-16-2014
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Cape 2 Rio

Maserati arriving with a huge advance:

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  #5758  
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Re: Rounded bows

Quote:
Originally Posted by capt vimes View Post
... And lifts the bow on a reach to plan earlier...
And on a close haul the bow is less 'dipped in' by the broad stern... The waterlines in a heeled situation is less - how to say - offline... But more in line with the course the boat is going...
There are a lot of merrits to a fat bow, but the main reason is lift to plan...
I don't think that the reason that XVIII century sailing boat was a rounded bow has to do to planing or dipping the bow while heeled (those boats heeled not much). Regarding an open type modern racer you are correct but that has nothing to do with this case.

We have talked extensively here about the advantages of that kind of bow, referring what his designer, David Raison, found about that in his studies and while racing and what we could observe on the last Transat. Maybe I did not have understood correctly Classic 30 question. I thought he was talking about the boat he posted.

Classic30, for more information search on the thread search engine for David Raison and Bathtube bow.

Regards

Paulo
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Last edited by PCP; 01-16-2014 at 10:34 AM.
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  #5759  
Old 01-16-2014
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Re: Interesting Sailboats

One of the new boats at Boot Duesseldorf this year will be the SQ25, a trailerable and incredibly versatile little boat. It will be available in many different layouts (interior and cockpit), performance or cruising rig, diesel or electric, and 3 keel configurations, for whatever your primary uses will be. The performance rig looks quite powerful. As a company, SQ has only been around for a year, but they are building boats in the old Dehler factory with most of the original Dehler production staff, so we should expect a pretty high build quality. They are also building Comfortina Yachts, and Scangaard 26. Can't wait to see the SQ25.
Entwurf SQ 25 | SQ Freienohl
http://www.sqy.de/files/sq25-he-17-gen-seite_sport.pdf
The design is the result of a design competition, where the winner was chosen by popular vote on their website.
Maybe an option for Mr Pelicano?
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  #5760  
Old 01-16-2014
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Sq 25

Very nice boat and congratulations to Marc-Oliver von Ahlen for a great design...and to the public that chose a very nice boat.

SQ25 | Yachtdesign v. Ahlen

Here are the dimensions:

LOA 7.50 m (standard)
LOA 7,80 m (twin rudder)
Hull length 7.50 m
Lwl: 6.74 m
Beam 2.49 m
Air draft 11.40 m
Fixed keel standard 1.30 m
Fixed keel shallow 1.10 m
Swing keel 0.70 m-1, 80 m
Sail area 32.7 square meters (Standard rig)
Light Displacement 1600 kg

and the two versions, the standard and the fast one:

















Regarding the designer he has experience in small fast boats, he is the one that designed the Sailart 22, one of the boats nominated for this year European boat of the year contest, this boat:

Kunst am Boot: Sailart 22 - Yacht TV - Segel Videos von Europas größtem Yacht Magazin

Also the one that designed the Sirius 35, one of the boats that was posted on the first posts of this thread.
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