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Berky 40 Carbon Catamaran

Old 03-06-2017, 05:56 PM
  #21  
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Are the sponsons symmetrical?

Are you going to have steps in the hull.?

Looks great
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Old 03-06-2017, 06:00 PM
  #22  
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I'm in, can't wait to see this take shape.
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Old 03-06-2017, 06:00 PM
  #23  
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Originally Posted by Berky View Post
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
It sounds like you are willing to take a very large financial gamble without having very many answers to your questions beforehand... Like I said you may want to do some more investigation into hull and tunnel shapes before committing to tooling along with getting a good handle on the weights with a comprehensive weight study.
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Old 03-06-2017, 06:24 PM
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After owning a boat with twin 300's I have a very hard time with those numbers. For me most of the boats dang near run what the motors provide. I think your better off with way more hp and huge props. Keeping the motors barely working provides efficient mpg and ability to carry 600 gallons.
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Old 03-06-2017, 06:30 PM
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Berky is spell autocorrect for barker....
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Old 03-06-2017, 07:20 PM
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Ready to see it run. I bet that it will run faster than your passengers want to go.
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Old 03-07-2017, 04:32 AM
  #27  
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Will a 37 freeman hit 70 with twin 300's and cruise 40 with 2.3? If not then what makes this hull that much better for speed and economy? I think Brian gets 72 with quad 300's.

Looks a lot like a Calcutta hull for sure.
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Old 03-07-2017, 06:12 AM
  #28  
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350s
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Old 03-07-2017, 06:17 AM
  #29  
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How much different would a infused carbon fiber freeman weigh compared to regular?
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Old 03-07-2017, 07:05 AM
  #30  
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Hey my Dad designed and built a 45' trimaran in Steamboat Co. I helped a little but that was in the late 70s before pot smoking was legal , people though he was crazy or waiting for the flood .
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Old 03-07-2017, 07:35 AM
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In 1995 I was involved with a project to build a friend a 35' deep vee twin 350hp Yanmar diesel boat , it was way over built and we nick named it the piling killer , old school hull construction balsa core, poly . I did a few composite parts floor, engine box and flush deck cuddy cabin . The goal was to do 60mph and it did it but took 200 yards to get on plane even with big K plane tabs on it . We couldn't keep the Bravo 1s together for very long as the torque would kill them .
Looking back at the weight and wetted surface area of that boat then looking at the cat I'm building that is somewhat spartan I think it will go close to 70 light load .

It is asymmetric .

Not Barker

Not a splash of anything else not even the steps ha ha ( you know who you are )

I would love to have the computer skills to do CFD like the link but my skill set is more impirical
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Old 03-07-2017, 08:28 AM
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Originally Posted by Berky View Post
Hey my Dad designed and built a 45' trimaran in Steamboat Co. I helped a little but that was in the late 70s before pot smoking was legal , people though he was crazy or waiting for the flood .
I knew it !
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Old 03-07-2017, 09:48 AM
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I think it'll work as long as the boat doesn't touch the water.
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Old 03-07-2017, 09:53 AM
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I want to clarify my comment. I love setup and data. My calculations were for my own benefit to understand your project in terms of HP, Weight, and Performance based on data given and anticipated speed. I was in no way trying to tell you anything other than I felt it was doable, and what the specs needed to accomplish your goals based on my experiences in this type of clean sheet build. The fact you are using infusion and carbon enables you to reduce the Weight to Prop ratio and Weight to HP ratio and given the information provided you are ambitious but not wrong!

I was sincere in my wishing you of luck in the process and your goals in the project, it was NOT a sarcastic statement and in no way was men't at all to be negative on your project.
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Old 03-07-2017, 10:30 AM
  #35  
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Love that sheer!
Beautiful lines
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Old 03-07-2017, 11:08 AM
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It's a little early to make a big deal of his projections at this point..the thing is not even built yet..

.besides on this board..unless you have a video that shows the engines in the back and the speed on a GPS...we don't believe any claims anyway.

And if he even comes close to his claim of " 40 knot eco cruise of 2.3 mpg (med. load)" nobody is going to give a shit what the WOT speed is...why we always talk about that is stupid.


good luck with the build..please post pics and information as you progress
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Old 03-07-2017, 11:20 AM
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So how long will the wings be? Like i said, dont touch the water and it will work.
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Old 03-07-2017, 11:40 AM
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Hey Boatsareawesome , I appreciate your words of encouragement !

I have a thick skin and don't mind the good , the bad and the ugly comments , the negitive Nancys help me rally , it would suck live in that world though .

I think it's awesome when people try something outside the shoe box Ha ha,, and I may not quite reach the target but it will still be a home run as I get to interact with all of you fellow boaters .
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Old 03-07-2017, 12:11 PM
  #39  
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Just thinking out loud.......If there is some aspiration for this to be a money maker and not a one off.....all of the same construction techniques /materials scaled back to 27' - 29' with 2 x 150 power giving 65 MPH on top and 3+ MPG at a 40 MPH cruise. You would own the trailerable fishing boat market at any reasonable price point.
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Old 03-07-2017, 12:16 PM
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nice build subscribed
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