BananaShark 34 build thread - Page 16

Cyco · 20-09-2010, 11:10 AM

Hi Cookee
Have you new bits turned up yet?
Let me know what you think of the 4 ways heads-up!

Cheers

Cookee · 20-09-2010, 01:05 PM

Quote:

Originally Posted by Cyco

Hi Cookee
Have you new bits turned up yet?
Let me know what you think of the 4 ways heads-up!

Cheers

All looks great! I think we'll have to get the next lot on a diet though!

Cyco · 20-09-2010, 01:30 PM

Quote:

Originally Posted by Cookee

All looks great! I think we'll have to get the next lot on a diet though!

Maybe ali for the next ones with an anodised finish.

Send me a pic once fitted please.

Hydrostream · 20-09-2010, 09:35 PM

Nice work Cookie and Kitten,

What are the two screen like mouldings you did when u were working on the deck plug, didnt see them used anywhere or did I miss something.

Cookee · 21-09-2010, 08:00 AM

Quote:

Originally Posted by Hydrostream

Nice work Cookie and Kitten,

What are the two screen like mouldings you did when u were working on the deck plug, didnt see them used anywhere or did I miss something.

They are plants in the deck mould and can be see in the photos in post 296. They will provide the rebates for the windscreen so that everything is flush with the cockpit.

Cookee · 24-09-2010, 02:54 PM

Getting closer day by day to joining it all up and having a one piece boat!

More photos today - The large vents in the steps make a weak point in the hull, this is strengthened using over 6 kilometres or Kevlar thread laid into the side of the hull with epoxy to put the strength back in, the Kevlar is also used between the two halves of the windscreen. The space between the layers of balsa is then filled to provide a level surface the put the next layer of combi mat on.

DAREDEVIL · 25-09-2010, 08:53 AM

I love the lay up, but why do u not use plasticore ??? just a guestion,,dont get mad.

plasticore can never rot and is stronger and lighter then balsa .

or is there an other reason ?

Captain Chaos · 25-09-2010, 12:16 PM

As in correx, fluted plastic stuff that estate agents boards are made from?

Hydrostream · 25-09-2010, 12:41 PM

Quote:

Originally Posted by DAREDEVIL

I love the lay up, but why do u not use plasticore ??? just a guestion,,dont get mad.

plasticore can never rot and is stronger and lighter then balsa .

or is there an other reason ?

Not answering for Cookie, but if you look at the properties for all cores you will see why balsa is used, mainly in shear but impact resistance also.
Airex or corecell foam would be similar but they arent without their own problems either.
Balsa will never give problems if its layed up correctly. Balsa got a bad name from shoddy workmanship.

Jon Fuller · 25-09-2010, 12:51 PM

Quote:

Originally Posted by Hydrostream

Balsa got a bad name from shoddy workmanship.

What he said.

Bad workmanship, or people stupid enough to cut/drill into it without ensuring watertightness.

Balsa core is the dogs bollox!

I'm sure 'Cookie' will agree.

DAREDEVIL · 29-09-2010, 04:41 AM

got ya !!

Cookee · 29-09-2010, 08:11 AM

Daredevil - Not familiar with Plasticore - is it a trade name for a product? As Hydrostream has said it has qualities that only Balsa can provide, certainly the resistance to impact of end grain Balsa is hard to beat and although our waters are nothing by US standards I think you will agree that Swipewipes has stood up to everything very well including a Round Britain race and a nasty Cowes Torquay race with a Balsa core (laminated properly!).

It is our product of choice even in the much smaller Phantom 19's that we build although it is limited to "Impact areas".

DAREDEVIL · 30-09-2010, 07:07 AM

Quote:

Originally Posted by Cookee

Daredevil - Not familiar with Plasticore - is it a trade name for a product? As Hydrostream has said it has qualities that only Balsa can provide, certainly the resistance to impact of end grain Balsa is hard to beat and although our waters are nothing by US standards I think you will agree that Swipewipes has stood up to everything very well including a Round Britain race and a nasty Cowes Torquay race with a Balsa core (laminated properly!).

It is our product of choice even in the much smaller Phantom 19's that we build although it is limited to "Impact areas".

I dont know how u realy call the plasticore...lol, but i know its just as or even stronger the balsa !!

here is a link for the product. if sandwiched and glassed right, its awsome strong. and very light.

look up plascore !!
http://www.fiberglassservices.com/products.htm

Scand · 30-09-2010, 07:45 AM

I have used the diab divinycell a lot in the past with very good results.
The only down side is that it is really expensive.
It’s used a lot in Norway for commercial vessels.
Diab is also the makers of ProBalsa, but I not tired this yet.

Cookee · 30-09-2010, 08:26 AM

Quote:

Originally Posted by DAREDEVIL

I dont know how u realy call the plasticore...lol, but i know its just as or even stronger the balsa !!

here is a link for the product. if sandwiched and glassed right, its awsome strong. and very light.

look up plascore !!
http://www.fiberglassservices.com/products.htm

OK I've found Plascore - we have similar honeycomb products over here and I see it comes in different materials as well. The trouble with these products and foams is that they don't have the impact resistance of Balsa as far as I know. In the Phantom 19's imagine the pounding the hull gets when landing off a big wave and an aluminium fuel tank landing on the hull from the inside trying to crush the laminate.

A very large catamaran called Phillips something or other failed and sank after using a similar material because it didn't stick very well and or because of design issues, and that was all Carbon as well - We'll stick with Balsa for the high load areas for now although these sorts of materials could be used for low impact areas like decks.

Scand · 30-09-2010, 09:31 AM

End grain balsa is the dog’s nuts for compressive strength per density. The shear strength is similar properties to Divinycell per density.

Jon Holmes · 30-09-2010, 02:01 PM

ATC Core-Cell is supposed to be good.

Tom Stone · 30-09-2010, 03:52 PM

majority of batboats are DIAB DIviniycell foam cored and next class of rnli lifeboat will be.

Cookee · 30-09-2010, 05:38 PM

Quote:

Originally Posted by Scand

End grain balsa is the dog’s nuts

DAREDEVIL · 01-10-2010, 06:13 AM

How can the tank hit the hull if its foamed in and bolted to the stringers ??mmhhhhhh... HIGH IMPACT ???? on my boat we used kevlar on the outside layer and we " REALY " tested a high impact with a 38 cal. hand gun...only the gelcoat was showing where the bullet hit ( shot from close range ( ~ 5 meter )..and the Kevlar plasticore had nothing ..not even a small ding in it .

So i dont understand your point of HIGH impact ..maybe design ?? i ma not a fiberglasser and when he got his gun out to show me i told him..HEY...if anything happens u gonna fix this and thats when i heard a loud POP !!!!

crazy..lol

But true !

Oh, and my deck is only 1cm coremat..with 1808 on each side plus the fluffy stuff to make it smoth..
boat is 31+ feet and weighs ~ 5650 pounds = 2562.80 KG.....including everything , race ready with 65-70 gallond of fuel !!!
Impact...not a chance of damaging the bottom of this boat , the sides are balsa , still.