In total there is going to be 5 hatches all waterproof. 3 in the deck 2 in the bulkheads for the airlocks. On each there will be several steps. Each step takes a day for the NM-epoxy to dry. I will take some time. But these waterproof hatches is an essenti...
This is an stimate.
The hatch rim is thicker so 50% more force is needed because of that.
There is also friction in the system so mere force is needed
The straps do not pull straight down also that reduces the force so more force is needed.
I am 82 years o...
I differ in that I take time to make my boat waterproof even if it is upside down.
The hatches are waterproof. The ventilation system is made in such away that no water can com in the boat even if she is upside down.
Here is a link to a rollover test made ...
Its an old idea. The old Egyptians used to get the four corners of their pyramids the same level to within one millimeter. The digged a canal around the base primeter and filled it with water. Old people can be very smart.
More information on my project an...
Its inded very simple to make. Use a bit of rope saturate with epoxy. To make it stronger wrap sting or more rope around it build up thickness to the desired strenght.
No it is not as stiff as glassfibre. But its not only Youngs modulus that makes a fittin...
Plenty of sandpaper I am set for one hundred more years of sanding flat hatches. But it was the minimum I could get.
For more information and donations se yrvind.com
Nothing like the real thing. It was when I saw how big the hatch in the aft bulkhead bekame I realised that I did not need a deck hatch above the dining room. The hatch in Exlex 2020 was 45 cm wide, this one is 60 cm wide.
For more information on the proje...
Polyoxybenzylmethylenglycolanhydride, better known as Bakelite reenforced with cotton I will use so that the Divinycell do not get compressed.
A trade name is Tufnol. It was much used for nautical hardware in the 50 and 6o-s for blocks and winches. It is ...
The spacers are now glued as is the distances that keep a sharp inner edge for the gsket in the aft bulkhead. All went well.
For more information on my sails and boats see yrvind.cm
There you can also donate.
More work on the foreward bulkhead. The edges of the opening have been rounded and laminated.
For more information on my cruising see yrvind.com
There you can also donate to the project on Paypal and Swish
Today I have making strong points for the ratchet strap in the forward bulkhead. Its two M8 eye bolts with backing plates. The backing plates rests on two layers of 600 gram carbon fibre. To not compress the Divinycell there is four 20 millimeter pipes wit...
Back in the 1970-s I invented a new type of sextant, a mini sextant its not bigger than a finger nail its weight is only 3 grams. Its intended as a back up to the ordinary sextant.
From Wikipedia:
The island is named after Sven Yrvind, a Swedish sailor and...
3 Bends:
Zeppelin bend
Carrick bend
Doubble European death bend.
They each got their advantages. Also the Capstan Equation. If you want to understand rope handling the Capstan Eqation and vectors are very good tools.
Bonus
How to transforme many yellow A4...
This is not to exciting, just routine work. But what is interesting is that this is the secound bulkhead hatch and I am learning all the time so it gets better than the first one.
I am learning all the time.
Still the first hatch is good. I mean even if yo...
The hatch lid have to fit with close tolerances the rim or coaming but the labyrinth makes it difficult to scribe it. I like to have a margin of 4 mm that it does not get stuck. To make it I made a little device that will help me to scribe it.
Also the sho...
None of the bulkheads are done. Before doing more work on #2 hatch I have decided to do a test with water on #1.
I will hand saw the strapes put pressure on the gasket and fill the space with water no water is an exellent result. A few drips will be OK.
St...
Everything went very well. The hatch was 100 % waterproof. Not one drop af water even after several hours. This was the forward bulkhead hatch. Now I hope that the other ones will be as fine.
To have a boat with a compartment that is always completly dry i...
Foreward bulkhead in place. I have started the filliting and reenforced it with carbon fibre. The lead pieces and clamps are still in place preventing me to do it all around. Without the support it may not stay in place.
For more information on my boats an...
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