Originally Posted by tomfl
Wondering how you came up with the "hundreds of pounds". In part my answer was based on a story my Dad told me about his experience. He was a Chief Petty Officer on a destroyer in WWII that was hit by a torpedo. I have little doubt that made a whole much larger than an escape hatch on any cat. He and several other men
too two mattresses from bunks and put them over the hole; from the inside. While it did not completely stop the water coming in the boat it did slow it down enough that a more complete repair was able to reduce the amount coming in to a very manageable amount. Even using gaffers tape around the edges would reduce the amount of water coming in the boat; and several iterations would greatly reduce the amount of water. No question it would be better to use four lines on a tarp/what ever on the outside of the boat; problem with that is that in a really bad seaway that might not be an option. I should also note that once the boat's aft quarter was below the water surface it should be easy to go inside the hull and affix a patch and then pump
the water out.
I do thing it is better to apply the fix before hand. But I also am convinced a lot of things happen that need to be dealt with on the spot. It is fairly common to hear of a hole in the hull of a boat; and the standard jury rig is to first slow water entering through the hole and then apply a better patch.
I “came up” with hundreds pounds from basic hydrostatics. I generalized to the case of an escape hatch being 20x20 inches (400 sq in in area) and it being underwater where the top edge is at the surface and the bottom being 20 inches below, so just covered. In the center of the hatch there would be about 1 psi of pressure. Over the entire hatch it would therefore be 400lbs.
You can say, well the hatch wouldn’t be completely covered, well look at photos of escape hatches
underway or with a significant sea, yes it is completely covered.
I had an exchange with the skipper
of the boat that was lost
. He tried to stop the water pouring into his boat with just about everything, cushions
, pillows, boards, anything he could lay his hands on. No luck. It is a 2 ft x 2ft hole in the side of the boat.
I had a exchange with a skipper
that accidentally left his hatch open in the San Blas and then went sailing. He managed to run the boat aground to keep it above water, but it took a dozen people two days to get the hatch resealed and the boat pumped out while it sat in 4 feet of water.
The bottom line is if the hatch fails completely you probably not going to be able to fix it. Certainly not with plastic sheeting and duct tape or a tarp or just about anything else. If you had a previously constructed plywood
covering, with a rubber seal and a way to secure it and apply pressure to engage the seal with the cover applied from the outside. This could work
and it what I pointed you to in the other thread.
If you did all that in advance, great. But why not just fix the root problem and go sailing instead?
As for four lines and a tarp, perhaps you should look at where an escape hatch is on most cats, typically under the bridge deck
with the mini keels below. Just how do you propose to secure this huge hole with a tarp???
I know about this problem because it happened to me 500 miles offshore
. Fortunately the lens had not left the boat. But it was very very hard to secure a pane of acrylic
because there is nothing to grab onto. The only solution we found was to go outside the boat to pound the lens back into the frame, then devise a solution to secure it. Since then I have secured the hatch so the lens can not come out, I no longer worry about my escape hatches
My guess is the boat off Puerto Rico
lost the lens completely and they had no chance. There are very few other things except perhaps ripping the saildrive
off the boat that can cause catastrophic flooding you can’t stop. Look at the photo
, there is no bow damage. Their boat is the same model as mine.
Again these hatches are a subject of a recall and owners should be aware of that and take appropriate action to correct the defect.