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45' B&B powercat out of the shop.

Old 08-30-2012, 04:19 PM
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Default 45' B&B powercat out of the shop.

She finally outgrew the shop and had to be moved outside to finish, Enjoy.
This boat is being built as a long range motor yacht but can be redesigned as either an express or convertible sportsfisherman.
With 320 hp per side this design is capable of 30 knots, with a cruise of 25 knots burning less than a gal of fuel to the mile. And at lower speed [ 10 to 12 knots] would be in the 2,5 to 3 mile per gal range for long passages.

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Old 08-30-2012, 04:28 PM
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Bly
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Default Looks Tippy.

Explain? Is this a fiberglass pieces you put together? Is it a one off?Is their molds to the pieces? We need more pictures.
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Old 08-30-2012, 04:30 PM
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For once...it doesn't look tippy.
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Old 08-30-2012, 04:31 PM
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Pretty cool.
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Old 08-30-2012, 04:32 PM
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HOLY CRAP! I want one! That's a LOT of platform to be that fuel efficient!
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Old 08-30-2012, 04:33 PM
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Originally Posted by Bly View Post
Explain? Is this a fiberglass pieces you put together? Is it a one off?Is their molds to the pieces? We need more pictures.
She is a custom one-off built with airex and epoxy glass. The hulls were built in halves in female jigs and then glassed together. I don't understand your title about looking tippy as a cat is very stable due to the flotation being so far outboard with the large beam. I have construction pictures I can add to this thread that I have posted before.
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Old 08-30-2012, 04:42 PM
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Default More pictures

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Old 08-30-2012, 04:43 PM
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Originally Posted by Capt Hugh Wilde View Post
I don't understand your title about looking tippy as a cat is very stable due to the flotation being so far outboard with the large beam.

http://en.wikipedia.org/wiki/Sarcasm
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Old 08-30-2012, 04:45 PM
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WOW, finally a good Cat, how much???

When should I put my order in???
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Old 08-30-2012, 04:45 PM
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Originally Posted by bigjimmie View Post
Point taken Jimmy.
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Old 08-30-2012, 05:00 PM
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Default Working on a 36' X 16' Express design

I am working with a man that has one of my monohulls on a 36' X 16' express cat with outboard power. She would be a really cool boat and I hope to know soon if we are going to build her.
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Old 08-30-2012, 05:00 PM
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Big beam, narrow hulls, high wingdeck. hard to tell from the photos, but are the hulls fully symmetric or slightly asymmetric? A bit like the modern high efficiency sailing cat hulls except for the 'bulb' bottoms.

When you are running at 25knts, is she planing or displacing? Assume at that length she must be planing, but how do the 'bulb's' affect her on the plane? You would assume lots of extra drag, but from your speed/fuel figures that obviously isn't the case. Is that due to the shape of the 'bulbs'? Does it have a displacement 'hump' starting at ~9 - 10knts like a standard hull, or does this hull form give a linear load transition right through to WOT?
Looking forward to seeing how it all goes. If the modelling is correct that's going to be a great result.
Personally I would have straightened the bow line above the water and enhanced the sheer a little more. But then I would have stuck a flybridge on it and turned it into what could be a fantastic sport fishing boat, so it is all about personal taste. The ability to troll at 9 - 10knts with this hulls low fuel burn and potentially huge cockpit space would be pretty attractive.
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Old 08-30-2012, 05:06 PM
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Aliboy, she is in displacement mode due to her long narrow waterlines. The 13.5 to 1 ratio of waterline beam to length allow her to defy Frude's law and she pulls almost no bow wave. That is what allows her to obtain this speed without planning.She should run at about 1/2 a degree up when at full speed, bulbs in the water. She will have a flybridge and if we build her as a fishing boat, the sheer will be redrawn and lowered at the stern.
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Old 08-30-2012, 05:27 PM
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Originally Posted by Capt Hugh Wilde View Post
She will have a flybridge and if we build her as a fishing boat, the sheer will be redrawn and lowered at the stern.
I hope she does end up as a sportfish - cuz I want to see that enhanced shear look on this one.
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Old 08-30-2012, 05:28 PM
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Thanks for the info. I can see these types of design becoming much more popular in the future due to their efficiency. I probably prefer monohulls in general, but the efficiency differences you can achieve with a good cat design are just going to get more and more important as time moves on. Sometime in the next few years we will be selling our 43ft monohull sport fisher and have been looking at these high efficiency cat hull shapes with a view to a 'motorsailer' setup. Cruise up to ~15knts on relatively low hp and reasonable performance from a sailing rig as well. Only these types of cat hulls can achieve that I think. Best compromise I can currently think of for long range cruising coupled with my game fishing addiction.
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Old 08-30-2012, 05:43 PM
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Originally Posted by Aliboy View Post
Thanks for the info. I can see these types of design becoming much more popular in the future due to their efficiency. I probably prefer monohulls in general, but the efficiency differences you can achieve with a good cat design are just going to get more and more important as time moves on. Sometime in the next few years we will be selling our 43ft monohull sport fisher and have been looking at these high efficiency cat hull shapes with a view to a 'motorsailer' setup. Cruise up to ~15knts on relatively low hp and reasonable performance from a sailing rig as well. Only these types of cat hulls can achieve that I think. Best compromise I can currently think of for long range cruising coupled with my game fishing addiction.
I think you're right. I've often thought that if I ever got to a point in life to spend long periods of time on a boat cruising that a motor sailer cat set up would be the way to do it that could give you the most space, stability, speed, and efficiency for the buck.
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Old 08-30-2012, 05:52 PM
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This boat has twin 4 cyl 200 Hp Yanmars and should top at 25 knots. She carries 730 gals of fuel and at 9 knots has transatlantic range at that speed. She carries fuel in 4 tanks so that you don't have to keep full tankage if you are not making a long passage.
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Old 08-30-2012, 06:09 PM
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Should be a nice cruiser.
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Old 08-30-2012, 06:13 PM
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Love it! Can't wait to see more as she progresses!
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Old 08-30-2012, 06:25 PM
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She's almost SWATH like, except the below water area is not bulb shaped.
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