Originally Posted by Cookee
Not sure why you think the positioning of the valves would be to blame? The boats in question are now built with hard noses as the mass of the boat was too much for a soft nose in a decent sea - simple as that.
From memory, and I may be wrong....
Because the valve for filling the tubes was on the inside this necessitated a hole between the cabin and the tube, i.e. a route for water to enter the cabin. Not sure if the tube parted company or the tube was torn but it exposed a weak point in the design which had already been corrected in later boats.