Originally Posted by Chotu
I'm a monohull
sort of bloke and very suspicious of the poor engineering which appears to go into the design of some multihulls.
Looking at the images
provided leads one to suspect that insufficient attention was given to the hull to bridge deck join. Whilst I have never owned a multihull
I have been on a few of them and noticed the prevalence of cracking in the hull to bridge deck joins on a number of them.
The two successful naval architecture philosophies in this area appear to be the use of comparatively fairly solid, limited section beams ie Wharam, or the largish, high section modulus box beams which dominate more modern designs.
Modern composites are fantastic materials in the design and construction freedoms they allow. However whilst they do allow the design and construction of very light, low maintenance
structures the lack of framing compared with older construction methods does throw up challenges from the viewpoint of load distribution: other than the occasional bulkhead there is often no framing available to assist with load distribution.
The image of the beam to hull join which has failed suggests that whilst a bulkhead was exploited to transfer loads from null to bridge deck chopping a dirty great hole in the bulkhead, to be able to access the head
, was not a good idea but that filleting hull to bridge deck along the entire length of the hull/bridge deck might fix the stress concentration problem the hole caused.
The opinion was expressed tight heartedly but I think it probable that the subject vessel could be salvaged.