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Berky 40 Carbon Catamaran

Old 03-06-2017, 12:06 PM
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Default Berky 40 Carbon Catamaran

Hi fellow boaters,

Thought I show a project that I've been working on , it's a 40ft long by 11'.99 beam catamaran . The prototype will be ready for sea trials in the next few months in a stripped down version . Construction will be mostly carbon/glass, epoxy vacuumed bag with thick core designed to dampen sound resonants . I've been working with composites for awhile and wanted to build a power cat to go down to Panama with as our 60' sailing cat takes 6 days to get to Limon with good winds .
My design requirements are :

- 1100 mi range
- 70 knot max (light load)
- 40 knot eco cruise of 2.3 mpg (med. load)
- 6,800lbs light ship displacement (empty)
- 14,500 max displacement
- 600 gal fuel
- twin 300s
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Old 03-06-2017, 12:10 PM
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Congrats on the new build and project. With a light load targeting 70 knots and a hull coefficient at 255 I have your boat coming in at 7500 pounds testing weight at around 72 mph with 600HP. Very cool stuff with the Carbon and the weight to HP ratio! Good luck.
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Old 03-06-2017, 12:18 PM
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Thanks Boatsareawesome !

It will be fun to get the real world weight and speed #s , we will see in a few months how it all works out in real life ha ha .
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Old 03-06-2017, 12:18 PM
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Iam in
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Old 03-06-2017, 12:19 PM
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No offense, but I think your WOT numbers are happy.
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Old 03-06-2017, 12:29 PM
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This should be interesting. Nice lines. How is the transom designed?
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Old 03-06-2017, 12:40 PM
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Looking forward to the progress.
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Old 03-06-2017, 12:41 PM
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hull looks nice, good lines. reminds me of the Calcutta cat.
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Old 03-06-2017, 02:34 PM
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Nice!
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Old 03-06-2017, 03:10 PM
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Thanks guys ,

I was thinking about having separate stand alone splash wells for each engine , want to keep the pockets ( very back corners of the boat ) accessible for fishing as that is some of the most valuable turf on the boat fishing wise , also want to have a 13" step over transom as water access is a big deal for us , this puts the transom 26" above the water .
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Old 03-06-2017, 03:42 PM
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Check out the Compmillenia builds on the forum.
Jim Gardiner has the lightest big cat at the moment but there is always room for growth.

I also think 70 knots is very optimistic unless its really stripped down. A long range boat with good top speed? That maybe asking a little much, having a boat that would handle the weight well and yet still get on top when not loaded.
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Old 03-06-2017, 03:44 PM
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2.3MPG @ 40KTS... in a 40' boat with that beam? I'm interested. LOL.
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Old 03-06-2017, 03:59 PM
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To the OP; are you considering surface drives? 70mph is a lot... I'm in as this is going to be interesting.
Not saying it can't be done...
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Old 03-06-2017, 04:07 PM
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Come on guys..... somebody's designing boats in Colorado
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Old 03-06-2017, 04:22 PM
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Originally Posted by Sarasota Line X View Post
Come on guys..... somebody's designing boats in Colorado
And one of the best naval architecture schools is in Michigan. What's your point.
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Old 03-06-2017, 05:27 PM
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Originally Posted by N2theblue View Post
And one of the best naval architecture schools is in Michigan. What's your point.

Well Michigan does have the second longest coastline of any state...and that program was set up by the Navy in the 1800's when shipping was far more prevalent on the lakes.

I will echo others that your speed expectations with twin 300's are rather optimistic. You may want to really look at what others are doing as far as hull design and if they are anywhere near the speed and efficiency that you hoping to hit.
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Old 03-06-2017, 05:32 PM
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Originally Posted by MIskier View Post
Well Michigan does have the second longest coastline of any state...and that program was set up by the Navy in the 1800's when shipping was far more prevalent on the lakes.
My point was that you don't have to be on the ocean to design boats.
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Old 03-06-2017, 05:39 PM
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Yes I think it is an ambitiuos goal , yes I think if it is light enough and the hydro/areo dynamics are right it is possible . Yes to carry the max load from displacement to planning will be tough . The main thing is efficient minimal wetted surface area when on a plane , the areo drag is a factor as the bows are almost 7' off the water on a soild plane to mow down some nasty rough water . Will I run the boat over 80% often no but 70 is the light ship goal , got to shoot high or what's the point . We will see in a few months
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Old 03-06-2017, 05:42 PM
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Best of luck, looking forward to it
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Old 03-06-2017, 05:47 PM
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Originally Posted by N2theblue View Post
My point was that you don't have to be on the ocean to design boats.
The Colorado reference is for recreational pot smoking.

Nothing to do with reality.
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