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Bad News For Bertram

January 23, 2009

(Widely circulated photos are incorporated in the text. - See update below.)

glass boats Note on Sinking of Bertram 63 "Absolutely"

Recently someone posted numerous pictures of a massive hull failure occurring on a 2008*, 63′ Bertram SF named CERTIFIABLE out of Palm Beach. These can be seen at in the Boating and Outdoors Photos under the post “Ugly.” The photos are large and so we can do a little trouble-shooting to try to ferret out what went wrong. We did not see the vessel personally and the following is gleaned solely on those photos, but we have seen many similar failures.

This failure involved an area of laminate failure on the port side and bottom along a length of about ten feet where the outer skin came off the core. The incident reportedly occurred in fair weather and the yacht made it back to port without sinking. Much of the core is exposed, unfortunately for Bertram, since we can get a good idea of what happened and why.

2008 Bertram 63 hull failure - Hull delamination Hull side and hull bottom delamination - 2008 Bertram 63

We do not know if this hull is vacuum bagged, but massive failures like this are not uncommon and I’ve seen lots of them. They have become increasingly common with vacuum bagged hulls for reasons that would be obvious to anyone who has watched the process. It is difficult and fraught with potential for error. Even worse, the errors get built-in without a visual chance to correct them as you would with a hand lay up. If this was a hand laid hull, then what we see there is just really shoddy workmanship. The outer skin failure is inexcusable because they applied the second layer far too late to get a decent bond. We suspect they did this to avoid print-through and thus sacrificed strength for appearance sake. Gel coat/skin failures have become very common for this reason.

What is most odd to me is that there are a number of failures. The first is what looks like a secondary bond failure in what should be a primary bond. Secondary bond failures resulting in the outer skin peeling off has become very common, most likely due the fact that in the vacuum lay up process, the gel coat and skinout layer are laid in before the remaining plies, core and bagging. This is where the very weak secondary bond occurs and is purely mechanical, not chemical, like multiple coats of paint.

2008 Bertram 63 - Secondary bond failures resulting in the outer skin peeling off

The photos are good enough that we can see major faults in the core installation, along with major outer skin failure of what looks to be two layers unidirectional fabric running fore n aft. No bias in any of the fabric, just all going the same direction. Is that good engineering? Don’t think so. Running all the fibers in one direction leaves the other axis totally vulnerable to stress loading.

2008 Bertram 63 - Hull outer skin failures showing unidirectional fabric running fore n aft

Then we have ply separation between ALL plies and the core. In other words, the whole laminate just failed at every bond. It would take some considerable forensics to figure that one out.

That this happened on the sides and bottom suggests two things. First, bad engineering and probably a structural problem as initiator. Second, faulty laminate engineering combined with an overall failure in the layup process. Precisely what that was I cannot tell, but the overall failure pattern tells me that the laminate simply fell apart under what was probably low stress due to overall weakness.

Next, the core can be seen to be poorly installed. There are very large gaps, as much as a quarter inch between individual core blocks and sections of core sheet. A bonding putty was used and, as usual, we see numerous areas of “never bond”; that is, the putty is not adhering to the core.

2008 Bertram 63 showing poorly installed core with large gaps between core blocks and core sheets and never-bond

In other photos it can be seen that the skin is disbonded all the way up the hull side to the sheer. This demonstrates both high interlaminar sheer stress and very likely excessive panting of the hull side, a condition usually due to inadequate framing resulting from over-reliance on the core for strength. In other words not enough bulkheads.

2008 Bertram 63 - Disbonded skin all the way up the hull side to the sheer

In summary, this case demonstrates why I don’t like so-called “high tech” materials in boat building. In this case, high tech means complicated in order to achieve light weight and speed. Inevitably, this ends up pushing the envelope of sound engineering too far. Why? Because the faster you go, the stronger it needs to be, not lighter and weaker. And that seems to be what happened: cut a few too many corners.

Does this mean that all Bertrams built like this are bad news? Probably not. There is weakness in design and materials plus shoddy workmanship, so it's a bit of a toss up. We’d have to see more than one failure before we could go any further. We’d also need to see the framing system. Too bad for Bertram. This will definitely hurt their reputation. Such events should help keep builders from cutting too many corners in the future. Too many of these failures have been covered and hushed up. I’m glad to see this one get exposed. Overall, that is good for the industry.

This sort of instance is one where you hope your insurance policy covers latent defects. Many insurers have removed this coverage since it covers the builder’s moral hazard, which property insurance should not do. “We don’t care if it falls apart because the owner’s insurance will pay for it.”

Posted January 23, 2009


*Jan-25-2009 by staff:

Year built "2004" in our original post was corrected to 2008.
(Year built 2008, Model year 2009 according to HIN on USCG record)

USCG vessel search by name result shows there are two documented "Certifiable" Bertram 63 with same owner:
-Documentation of the first boat (year built 2004) was expired in October 31, 2008.
-Documentation for the second boat (year built 2008) was issued on October 06, 2008 for expiration October 31, 2009.

Bertram 63 "Certifiable" year built 2004:
Google search by hull number resulted listings for sale at three web sites as of January 25, 2009.
There are a couple of reference to Bertram 63 "Certifiable" by the same owner from March 12, 2008 through May 28, 2008 in "latest news" at

Bertram 63 "Certifiable":
Google search results several fishing tournament related local newspapers' articles referred to the "Certifiable" during January 2009.

Feb-03-2009 by staff:

"Big Syd", the owner of the boat as he said, posted on Feb-03-09 his comment at a thread titled "Catastrophic delamination on a new Bertram 63' " page 6:

Feb-04-2009 by staff:

The origin of these photos are unknown. With David Pascoe's permission, we have incorporated them for better understanding of the text.  Since around January 20, 2009, these photos have been widely circulated over the Internet forums.

Feb-05-2009 by staff:

On Jan-28-2009, "Bertram09" posted "Bertram Yacht's Response- 630" at:

No further comment or response by Bertram Yacht is found on this Bertram 63.

Jan-02-2010 by staff:

Link to "Note to Sinking of Bertram 63 "Absolutely" (summary by staff on a 2006 Bertram 63 sinking ) was added.

Related Readings: Cores and Structural Issues

David Pascoe Power Boat Books

Buyers' Guide to Outboard Boats Surveying Fiberglass Power Boats (2E)
David Pascoe Power Boat Books Visit for his power boat books

David Pascoe - Biography

David Pascoe is a second generation marine surveyor in his family who began his surveying career at age 16 as an apprentice in 1965 as the era of wooden boats was drawing to a close.

Certified by the National Association of Marine Surveyors in 1972, he has conducted over 5,000 pre purchase surveys in addition to having conducted hundreds of boating accident investigations, including fires, sinkings, hull failures and machinery failure analysis.

Over forty years of knowledge and experience are brought to bear in following books. David Pascoe is the author of:

In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001.

In 2012, David Pascoe has retired from marine surveying business at age 65.

On November 23rd, 2018, David Pascoe has passed away at age 71.

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