Todays Boat Construction

**OneBadInjun** · 01-31-2009 01:24 PM

Originally Posted by SHARKEY-IMAGES

Thanks Steve!

The one thing I changed in the future layups was I feathered the chop mat as it ran up the bow so it would not to leave such a solid edge.
A shot of the final inside layer:

Is that a 40 or 45 foot big vee hull? Are you building them now?

SHARKEY-IMAGES · 01-31-2009 02:02 PM

Originally Posted by OneBadInjun

Is that a 40 or 45 foot big vee hull? Are you building them now?

No.

That would be this one that is being built by Hydra whom I used to work for:

More photos: http://sharkeyimages.zenfolio.com/p100583851

**BradH** · 01-31-2009 02:23 PM

Foam in a Whaler is a structural material, just not a core like we are familiar. Comparing the two was not fair, however it does show that foam in general can have its problems. Other builders like Edgewater and Everglades are especially fond of it. But that’s a completely different type of construction.

Balsa does have many shortcomings as you guys pointed out. Absorption of both water and resin is at the top. I think I’ve seen a “skinned” balsa material that may alleviate some of theses issues.

Personal opinion is that the new polymer core materials are the way to go for high end construction. As said earlier they are available in almost any weight and cut. Has any material been developed that outperforms marine grade ply for transoms?

Resin infusion is attractive for large production builders where they are trying to control VOC emissions.

The big issue with any of this is preventing water from penetrating the inner or outer layers in the first place.

**Offshore Ginger** · 01-31-2009 04:21 PM

Hey Steve #1 - Tim - sharky , Just curious guys have we been doing this to long and how many years have you been in the business ? I personally have over thirty years experience in the field and i guess that qualifies me as an old goat roper .

SHARKEY-IMAGES · 01-31-2009 04:57 PM

I started around 1984 and got out around 1995 ??? But non the less I always admire a good clean lay up.

**Steve 1** · 01-31-2009 05:30 PM

Originally Posted by Offshore Ginger

Hey Steve #1 - Tim - sharky , Just curious guys have we been doing this to long and how many years have you been in the business ? I personally have over thirty years experience in the field and i guess that qualifies me as an old goat roper .

Glass work As a life style LOL ? 78 when I knocked the Bottom out of my raceboat in the Magnum Marine Bahamas 100 and figured I could do it better myself! I was always fooling with fiberglass it was cheap and you could make anything out of it.
.

**Steve 1** · 01-31-2009 05:50 PM

Originally Posted by BradH

Foam in a Whaler is a structural material, just not a core like we are familiar. Comparing the two was not fair, however it does show that foam in general can have its problems. Other builders like Edgewater and Everglades are especially fond of it. But that’s a completely different type of construction.

Balsa does have many shortcomings as you guys pointed out. Absorption of both water and resin is at the top. I think I’ve seen a “skinned” balsa material that may alleviate some of theses issues.

Personal opinion is that the new polymer core materials are the way to go for high end construction. As said earlier they are available in almost any weight and cut. Has any material been developed that outperforms marine grade ply for transoms?

Resin infusion is attractive for large production builders where they are trying to control VOC emissions.

The big issue with any of this is preventing water from penetrating the inner or outer layers in the first place.

Dude here is some testing

http://www.youtube.com/watch?v=DRzyw0Jo8Zg

The first one is Airex R63.80 Next is A 400 then A 600 Corecell Then 2 Cross linked foams and the two Balsa samples Structural cores are not Poured !!They are made in very controlled conditions and should never be confused with the Cheap two part systems AS they start life as a Real Engineering Plastic. BTW water will not hurt them for say 300 years Hell Airex is PVC.

**skaterdave** · 01-31-2009 06:12 PM

nice demo. what was that third core? looked like divinacell?? and i assume the last is balsa? heres a few pics of a project we've been just finishing

**Offshore Ginger** · 01-31-2009 06:43 PM

Originally Posted by skaterdave

nice demo. what was that third core? looked like divinacell?? and i assume the last is balsa? heres a few pics of a project we've been just finishing

What is it , a lab strake hull for a Jersey Skiff..............orrrrrrrrrrrrrrrrr please do not tell me it is for a ragger boat

**Steve 1** · 01-31-2009 07:29 PM

Originally Posted by skaterdave

nice demo. what was that third core? looked like divinacell?? and i assume the last is balsa? heres a few pics of a project we've been just finishing

Yes it was Divinycell on the third test set the last two panels were Balsa.

Way Cool Job BTW

**skaterdave** · 01-31-2009 08:08 PM

Originally Posted by Offshore Ginger

What is it , a lab strake hull for a Jersey Skiff..............orrrrrrrrrrrrrrrrr please do not tell me it is for a ragger boat

aaaahhhh yes, wondering if anyone would know what a skiff is.

steve 1, gotta watch i know alot of guys like the airex over the corecell, but from what i've been told its not good for decks or hull sides that would get a lot of heat from the sun.

**THEJOKER** · 01-31-2009 08:44 PM

Secret spy pic.

**Steve 1** · 01-31-2009 09:20 PM

Originally Posted by skaterdave

aaaahhhh yes, wondering if anyone would know what a skiff is.

steve 1, gotta watch i know alot of guys like the airex over the corecell, but from what i've been told its not good for decks or hull sides that would get a lot of heat from the sun.

Got to be careful it is PVC and you can have a problem on a dark boat,But It has the the highest Peel Strength of all the cores and you can deform the cells like 80% before rupture and it spreads loading out well. I have a lot of history with it.

**BradH** · 01-31-2009 10:23 PM

Originally Posted by Steve 1

Dude here is some testing

http://www.youtube.com/watch?v=DRzyw0Jo8Zg

The first one is Airex R63.80 Next is A 400 then A 600 Corecell Then 2 Cross linked foams and the two Balsa samples Structural cores are not Poured !!They are made in very controlled conditions and should never be confused with the Cheap two part systems AS they start life as a Real Engineering Plastic. BTW water will not hurt them for say 300 years Hell Airex is PVC.

Yah the new engineered cores are amazing, and let's get off the older technology two-part foams for a completely different type of boat. I did not know the new Airex had so much elasticity. Is the stiffness still as high as the others? Whats the loading and panel width?

What are you guys' thoughts on transom cores?

**JnT** · 01-31-2009 11:01 PM

Great info. Thanks for the education.
Jim

**Steve 1** · 01-31-2009 11:07 PM

Originally Posted by BradH

Yah the new engineered cores are amazing, and let's get off the older technology two-part foams for a completely different type of boat. I did not know the new Airex had so much elasticity. Is the stiffness still as high as the others? Whats the loading and panel width?

What are you guys' thoughts on transom cores?

Coosa has some material Mantex has been around for a while.

Airex lets put it this way; I built a 1188 pound 36 foot 9 foot beam Cat from it in 91 and I can do much better nowadays. Stiffness S-Glass or S glass Carbon blend would I imagine produce the best numbers depending on the facings filiment content.

**THEJOKER** · 01-31-2009 11:23 PM

We've done Coosa and plywood. 0 failures.

**THEJOKER** · 01-31-2009 11:28 PM

Some of our new work. I have a talented partner!

**Steve 1** · 02-01-2009 01:26 AM

Originally Posted by THEJOKER

Some of our new work. I have a talented partner!

Real nice looking stuff !!

SHARKEY-IMAGES · 02-01-2009 08:23 AM

Demo from DIAB at the IBEX Show:

Thread: Todays Boat Construction

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