new hull form for catrigged boat

Hi there,
I found on the web this cat rigged boat.
Never seen before such a hull for a cat.Can anybody confirm that the entrance
has a kind of trimaran shape??!!
If it's not matter of a light reflextion, apart from more stability, would this
contribute to push back the center of lateral resistance which is an issue on a wide beamy boat?
See attatched picture
It would be interesting to know somebodyelse's opinion.
Thanks
Adriano

 

Trimaran shape? What are you smoking?
This is a catboat, not a catamaran. A catboat is a traditional hull of wide flat form, usually centerboard, with beam typically half of length,and with a single mast mounted far forward. Almost always gaff rigged with no jib. They developed as working sail for the shallow waters around Cape Cod and Long island sound, but are now usually pleasure craft. See Beetle Cat for another common example.

 

Yes, it is a monohull of a traditional type. The bottom is a bit flatter than usual though.

 

I can see where the shadows on the hull may have confused the OP. However, this is indeed a traditional catboat. The hull shape seems to be a bit of an updated sandbagger type hull. It does look a bit flatter than usual.

 

Yes of course Iknow what is a catboat, I mentioned trimaran "kind of entrance shape!" because of my poor english knowledge
You have to agree that picture shows something different unusual at least for my experiences. may be you didn't notice it?!
Adriano

 

Yes, I agree that's all about, the reflextions are confusing a bit the shape.
I was wondering too, may be somebody could have done a prototype?!
Adriano

 

right,
adriano

 

LOL. Ok, I see the shadows /reflections of the black support beds are deceiving. My apologies. Yes, an unusual hull even among cats. Very slick.

 

cat boat modeling

Hi there,
I would very much appreciate any comments whether sofar anything wrong with the following diamentions.
Am trying to model Gil Smith's Lucile kind of catboat with following
measurements (of my actual model):
LOA mt. 5.0
LWL mt. 4.4
Beam wl mt. 1.333
draught mt. 0.15
Cp 0.457
Long. Center of Buoyancy -1.479
skeg/rudder and centerbaord have to be added of course.
That's the best I could achieve, indeed trying to bring back the CLR
in order to avoid strong wheather helm typical for beamy boats.
On one hand I wouldn't like to change too much from the original beautiful
lines of those traditional catboats.
Many thanks in advance for any suggestions/improvements.
Adriano

 

Catboats are usually beamier. Also, they carry the beam far forward to accommodate the mast.

 

The hull form modeled there, wold typically be referred to as a freak and not to be taken very seriously, for obvious reasons. How did you come about to develop lines of those proportions?

 

I presume that the middle drawing is the curve of areas of your boat. You will surely wish to change the lines of the boat so that the area distribution is a lot closer to the curve of a conventional boat. A layout like the one you show will cause the boat to be most inefficient. To put it bluntly, it will be a dog.

 

If you're going to carry a cat rig right up front, you will need more substance there to carry mast weight and more buoyancy for the sail power to lean onto - and not push the bow down - as will surely happen with your fine bowed design, hard steering will result.
Your as drawn boat would be okay with a conventional rig stepped further aft, then you could keep your fine and hollow bow, which you obviously like. Also why the overhanging after sections? A true Skimming dish/dinghy-type boat has buoyancy there for downwind planing and also longer waterline length for better windward speed and power to carry more sail. If you're concerned about dragging sterns in light airs, you just shift crew forward and to leeward, which leaves a fine clean wake.
Yours would be better on a classic long keel boat.
This 18 foot design carries a double cat rig (sketch) and balances very well, is powerful and fast. Not saying this is the apotheosis of dinghy design but just an example of a similar sized hull to your own.

 

Adriano, you are more or less ok on some buttocks of the bodyplan view, but far away on the other views. Check the waterlines on the plan view, they must look weird by now.
This Gil's beauty is awesome:

 

Gooday 'que' - if that boat is in your - ' backyard pond' - be very + + very prepared for a HUGE attack & boarding party - CAUSE - I'm a commin' to getcha - WOW What a beautifull sailing vessel - - such a classic - not 1 bit of wake - or trouble through the water. If only the very 'smart' (NOT) modern designers could EVER do so well ! ! ! WOW - Blinken heck - I wish I could get to sail such a lovely vessel. Ciao, ajmes