Bertram or Hatteras ?

[REBrueckner]

For some interesting insights with photos into Bertram fiberglass work and vaccum bagging versus hand layup check this article:

http://www.yachtsurvey.com/bad_news_for_Bertram.htm

Are newer Hatts hand lay up?? If not when did they change?

 

[bigbill]

some of the newer hatts are being built using the s.c.r.i.m.p. method, not sure when they started, or which hulls use this method. gulf coast hatteras had some cut-away pieces on display at the gulf coast rendezvous in may. bigbill

 

[Pascal]

i dont think the problem is between hand laid or vacuum bagging but the use of core, weak structure and light weight laminates.

there is an interesting article in last month PMY about a 70' Hatt SF with triple Cats, incl. pictures of the hull construction.

dont' forget that Bertram is no longer the real Bertram company but part of the Ferreti group. Not that Brunswick is much better than Ferretti

similar delaminatino happened to a viking SF after it hit a whale in So Cal or Mexico. they made it back but the hull was completly delaminated like this bertram

 

[Trojan]

i dont think the problem is between hand laid or vacuum bagging but the use of core, weak structure and light weight laminates.

there is an interesting article in last month PMY about a 70' Hatt SF with triple Cats, incl. pictures of the hull construction.

dont' forget that Bertram is no longer the real Bertram company but part of the Ferreti group. Not that Brunswick is much better than Ferretti

similar delaminatino happened to a viking SF after it hit a whale in So Cal or Mexico. they made it back but the hull was completly delaminated like this bertram

I agree with the above in most part. What is critical is the bond between the outer inside skin and the outer inner skin. The laminate must be strong enough to prevent crushing and the gaps must be wide enough to let the joining resin to squeeze through the cracks an bond to the outer inner skin. The time frame between when the inner and outer skins are joined is also critical for bonding. All resin and glass boats are hand laid. That is the only way you can get the resin and cloth where you want it. Vacuuming is used to insure that all the air is removed from any voids during the application of cloth and resin.


It would be my guess that the outer hull set to long before the inner was applied. The only way you can have delamination is through lack of bonding between layers. Once the resin is cured the bonding surface must be sanded before any other resin is applied. The trick is to add the resin before the first coat is fully cured. At least that was the way we laid up the boats where I worked. Built many a sail boats this way. I don't know of any that ever delaminated. But then we never built a hull with a core.

BILL