Notices
Like Tree522Likes

Berky 40 Carbon Catamaran

Old 03-07-2017, 12:18 PM
  #41  
Member
 
Join Date: Feb 2017
Location: NC
Posts: 76
Default

Following, neat looking build!
Ramblin Sportfishing is offline  
Old 03-07-2017, 02:11 PM
  #42  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2013
Posts: 4,501
Default

Originally Posted by Berky View Post
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
https://www.youtube.com/watch?v=al-f9zODwjI
I have an old school cat - A Chris Cat-1984 George Linder designed it for Chris Craft. They raced very successfully many years- did 101 mph avg in one race.

The steps are proven designs and add speed while reducing drag.

Neat design on the 35V- Bravos cannot take the torque of diesels....
avalonandl is offline  
Old 03-07-2017, 02:36 PM
  #43  
Senior Member
 
Join Date: Mar 2009
Posts: 9,247
Default

not trying to be a negative Nancy....just sayin maybe a hydrofoil will get you there.
Rod27 is offline  
Old 03-07-2017, 03:25 PM
  #44  
THT Sponsor Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Feb 2017
Location: FL.
Posts: 535
Default

Thanks,

HTJ , that's a good call , could keep the beam to length ratio right and have under 10.5 ' trailer width .
In Florida you can tow under 12' with a $330. annual permit hence the upper 30' to 40ish boats , there are restriction and it wouldn't be fun to tow all the time but it's doable .
I think the most buck for the bang is in the large CC outboard boats just before any type of interior goes into it , plus it is a great multi tasking size as you can camp cruise , charter , commercial fish , family day trip , dive , surfing and use as an aqua pickup .
Berky is offline  
Old 03-07-2017, 03:37 PM
  #45  
THT Sponsor Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Feb 2017
Location: FL.
Posts: 535
Default

Foils are cool and the ride is hard to beat but I would like a boat that works well without them first , then play with a smaller version that doesn't bridge the gap of the tunnel , yes I know you have a loss of efficiency with two tips and less lift but seaweed ,lines and other stuff won't be as apt to get caught , man you should see Panama in the rainy season , lots of trees and things in the water .
Berky is offline  
Old 03-07-2017, 04:00 PM
  #46  
Senior Member
 
Join Date: Feb 2011
Posts: 1,142
Default

Originally Posted by Berky View Post
Foils are cool and the ride is hard to beat but I would like a boat that works well without them first , then play with a smaller version that doesn't bridge the gap of the tunnel , yes I know you have a loss of efficiency with two tips and less lift but seaweed ,lines and other stuff won't be as apt to get caught , man you should see Panama in the rainy season , lots of trees and things in the water .
What region of Panama are you planning to take her to?

Looks like a cool build. When you read through the Compmellenia's build thread you see the full extent they went to to save weight throughout the build, every ounce counts
HurricaneBK is offline  
Old 03-07-2017, 04:32 PM
  #47  
Senior Member
 
Join Date: May 2014
Posts: 297
Default

Throw a pair of 400R's on the back.
216rinker is offline  
Old 03-07-2017, 04:39 PM
  #48  
Senior Member
 
trimnyc's Avatar
 
Join Date: Jul 2015
Location: Queens, NY
Posts: 3,242
Default

Originally Posted by 216rinker View Post
Throw a pair of 400R's on the back.
A pair of 7 marine 557 and we're in business.
trimnyc is offline  
Old 03-07-2017, 04:44 PM
  #49  
Senior Member
 
Join Date: Dec 2016
Location: USA
Posts: 448
Default

Originally Posted by pathfinder44 View Post
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.
Freeman 37 needs quad 300 to get 70...1200 hp not 600 hp
offtheline is offline  
Old 03-08-2017, 03:12 AM
  #50  
THT Sponsor Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Feb 2017
Location: FL.
Posts: 535
Default

We have land and half a house on an island in Veraguas providence on the Pacific side.

The Freeman 37 is a awesome boat , it's built with quality materials and has a great ride . Part of what makes it ride so nice is weight , it is hard to beat the ride of a heavy boat ( I ran a 31 Ocean Master for a few years ) but you must push a heavy boat with big HP .

I want to get out of the cycle of : heavy = more planning surface area = more HP = more fuel = less efficiency .

That is a vicious cycle that ends up with a boat that has a short range .

The fun challenge is to go lighter but still get the ride quality , that is the nuts of the whole thing,,, it is easy to get the speed if you keep it light and have the proper angle of attack on your plannig surface area without to much deadrise .

I would love to do a 557 or 627 twin boat but not with a light 40' cat boat it would be as hairy as a Checkmate ( well it could be when it lifted off ) , 46' with a 14' beam and a bit of interior heck ya .
Berky is offline  
Old 03-08-2017, 04:01 AM
  #51  
Senior MemberCaptains Club Member
 
Join Date: Jun 2006
Location: Diamondhead, MS
Posts: 3,895
Default

Originally Posted by Fordy View Post
How much different would a infused carbon fiber freeman weigh compared to regular?
You can infuse any boat to make it lighter and yes it will run faster..but not if the bottom and a few other items were not designed from onset the boat will not perform like expected. Everyone wants speed...but when you figure out the correct balance of design...weight...bottom...blueprint...materials.. .the speed and ride will perform as expected, and then you have something. It's cheaper to have Jim at Compmillennia build you a boat.
Jassman is offline  
Old 03-08-2017, 04:11 AM
  #52  
Senior Member Admiral's Club Member
Marine Advertiser
 
Join Date: Nov 2012
Posts: 2,302
Default

After reading the comp thread it sounds like your exact build. The lengths they went to for weight savings were everything & everywhere.
Sarasota Line X is offline  
Old 03-08-2017, 04:12 AM
  #53  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2011
Posts: 1,955
Default

Subscribed. Need to see how this pans out
duke460 is online now  
Old 03-08-2017, 04:27 AM
  #54  
Senior MemberCaptains Club Member
 
Join Date: Jan 2005
Location: Cape Cod
Posts: 12,669
Default

Originally Posted by Jassman View Post
You can infuse any boat to make it lighter and yes it will run faster..but not if the bottom and a few other items were not designed from onset the boat will not perform like expected. Everyone wants speed...but when you figure out the correct balance of design...weight...bottom...blueprint...materials.. .the speed and ride will perform as expected, and then you have something. It's cheaper to have Jim at Compmillennia build you a boat.
Jim has a boat that meets this man's goal however he would not have the satisfaction of building his dream.
How far along is your Comp? Truly cutting edge
ubettcha13 is offline  
Old 03-08-2017, 04:30 AM
  #55  
Senior Member
 
Join Date: Oct 2009
Posts: 9,201
Default

Originally Posted by Jassman View Post
It's cheaper to have Jim at Compmillennia build you a boat.
But not as fun or satisfying
N2theblue is offline  
Old 03-08-2017, 05:55 AM
  #56  
Admirals Club Admiral's Club Member
THT sponsor
 
Join Date: Sep 2015
Location: Palm Harbor, FL
Posts: 1,073
Default

We put a 33 X 8.5 Hydra Carbon Kevlar infused together that is similar weight and is one of the most efficient cat hulls out. Our real world #s are only slightly better than you are predicting. Pics of our #s can be seen at
http://www.boatandmotorsuperstores.c...ra--33/1560880
I am interested to see your hull bottom. We top out around 75 and get close to 3 MPH at 30. Over 2.5 at 40 MPH.
BOATANDMOTORSUPERSTORES is offline  
Old 03-08-2017, 06:11 AM
  #57  
THT Sponsor Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Feb 2017
Location: FL.
Posts: 535
Default

I think the Compmillennia cat is very cool construction wise and design wise but it's not what I want , I think the Comp cat would be the most stable for the weight as it is very slab sided with max WL beam , the massive chine into a massive step with the vee pannel flattening into the step as well is steptastic , I would guess this platform must very stable on the pitch axis as well with not much change in planning angle regardless of motor trim , on the yaw axis I'm interested to see how it tracks in a big swell with some wind on the beam some step boats do unpredictable things though most of my experience with steps is small boat stuff , more cup in the prop will help it hook up in the wake of that big step . The design looks like anyone could grab the binnicle run it and the boat is going to do what the boat is going to do . I applaud the design and have mad respect for designer .
I grew up surfing , windsurfing , boating and want a responsive boat , I am a sucker for the beautiful lines of the North Carolina sport fish boats and want to put that in the mix as well . I'm an efficiency nut and have built many different composite parts from traditional pangas in old school mat/ roving, poly to highend prepreg nomex stuff to a 60' sailing cat in honey comb core ,epoxy vacuum bagged contruction ( it was one of the fastest term charter boats in the Virgins 2000 to 2005 ) . Yes I have a boating problem , have to be on in or near the water . Everyone has their own punch list of things they want in a boat , the one I'm working on is mine . I could have gotten funded for my project if I would crank the WL beam out further (the guy was worried about roll stability for bottom fish the middle grounds and didn't need a trailer able boat ) but that's not the direction I wanted to go you know the song .
CANARIANFISHER likes this.
Berky is offline  
Old 03-08-2017, 06:28 AM
  #58  
THT Sponsor Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Feb 2017
Location: FL.
Posts: 535
Default

B&MSuperStores , That's a cool boat , a lot of the race inspired hull shapes need speed to fly it rather than drive it , they are in ground effects and a constant balance areo lift and hydro trim/ drive . I think it's great that the hull form works that well at lower speeds , It would be fun to try it with some 557s I would guess at 80ish you could really start getting rid of some wetted surface area and start flying but I'm not versed in the high speed world .
Berky is offline  
Old 03-08-2017, 10:42 AM
  #59  
Admirals Club Admiral's Club Member
THT sponsor
 
Join Date: Sep 2015
Location: Palm Harbor, FL
Posts: 1,073
Default

We built a 33 X 8.6 Hydra Kevlar / Carbon Infused cat. This is one of the most efficient hulls out there. We are near the same weight with fuel and minimal gear. We get close to 3 MPG at 30. 2.5 at 40. The details are available at boatandmotorsuperstores under new boats.
BOATANDMOTORSUPERSTORES is offline  
Old 03-08-2017, 10:48 AM
  #60  
Admirals Club Admiral's Club Member
THT sponsor
 
Join Date: Sep 2015
Location: Palm Harbor, FL
Posts: 1,073
Default

We did 80 with twin 400s t top and fuel. A very similar hull with twin big blocks raced in over 100 mph
Attached Images  
BOATANDMOTORSUPERSTORES is offline  

Thread Tools
Search this Thread