Quote:
Originally Posted by Captain Ahab Jr
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Very informative, thank you.
He says at 45 deg the ship would start flooding from HVAC ducts, not from doors and hatches which would not flood until a much greater angle.
It seems to me that HVAC ducts are small relative to the conditioned volume, so the ship would have to stay heeled for some period of time before the flooding would overcome the righting force. Downbursts usually last a few minutes, I think. I wonder how close the ship was to surviving.
It also seems to me that the HVAC ducts could have been positioned at the centerline . . .
See below for excerpts:
"The downflooding angle for Bayesian was around 40-45 degrees… much less than the AVS. So, unless the vent dampers are closed (which with HVAC systems and generator running they would NOT be as they need to be open for that), the vessel will start to flood rapidly if heeled more than the downflooding angle."
"Bayesian had only one shell door in the hull, on the port side aft. As this was very close to the waterline, it was rarely used (remembering the extra 30T of ballast mentioned earlier… this caused the water line to be 100mm higher than other 56m Perinis, hence much closer to the bottom of the shell opening meaning it could only be opened in flat calm conditions… 100% it was NOT open at night)
There are no opening windows or portholes, which are all made from laminated marine glass bonded to the hull & superstructure.
Other deck hatch / superstructure openings that breach the watertight integrity on Bayesian are on or close to the centerline of the vessel. For these to be taking water if open, the vessel would have to be heeled way beyond the Downflooding Angle mentioned earlier, and hence already flooding via ducting/vents."