Finnish fishing boat overhaul [Splashed 2017]

[Red Herring]

Late christmas presents for the boat all the way from your side of the pond: Got the Specter military jerry cans(diesel reserve) and the C-head in the mail today.

 

[Red Herring]

No Title

 

[Red Herring]

Hello again everybody, hope you enjoyed the holidays and saw a lot of snow!

I've been sick since I last worked on the boat, spent most of the free days in a fever coughing with my nose plugged. Now it's luckily getting better, and I'm back to building. Or at least planning stuff.

Now I'm trying to determine the freeing port sizes for the aft deck. Would like to make them big enough but not excessive, I've found some ways of calculating water drain but it's all just guessing at this point. If you have any advice then I'll be glad to hear it!

The aft deck is roughly a box that has a size of 5m x 2.7m x 0.40m. In a worst case scenario this well could take in approx 5600 litres (1500 gallons)of water. According to some boat building guidelines I found on the web I'd need approx 700cm2 of holes near the deck to properly drain such a big area, but that sounds huge! That's 108 square inches of holes.

That would need twelve 2 in x 4in holes along the deck, and that sounds and seems excessive to say the least, at least compared to all other boats I've seen locally.

Of course it wont be a boat for open seas, but still? Are my calculations badly off?

 

[Red Herring]

That would be at least six holes that would be the same size as my Iphone 6...

 

[kcassells]

I would use a flat roof, rain water sizing chart. Common in determining the size/sizes of pipe/rain leaders required to remove x water from x footage of flat roof. I'm heading off to my night shift job. I'll find the formula when I get back and shoot it over. Of course it's not going to be exact with this application but a good start.
kc

 

[Teamster]

The only thing I know is when you get unwanted water in a boat you need to have a way to get it out,...

I'd probably double what is generally calculated,....

Do yous have any pictures of what your talking about??

 

[Red Herring]

https://www.law.cornell.edu/cfr/text/46/171.150

That's what I used for calculating, went with 100% but could probably go with 50% as well. Hmm.

 

[Red Herring]

After some consultation with boat building professionals the idea of six Iphone sized holes seems to be in the ballpark, so I'll go with that.


Now I'm fooling around with the engine cover.

 

[kcassells]

Good for you! Your progress aways amazes me!

 

[redneck joe]

You doing scupper or just holes?

 

[Red Herring]

Just holes, or freeing ports. They do exist with spring loaded "lids" and coamings but I haven't found any of reasonable size as of yet.

 

[nurseman]

Glad to hear you got it figured out. Looking mighty good.

 

[Red Herring]

Chilly -20c today! But the sea is still fighting the ice somehow, hope it'll freeze proper so we'd get a chance to ski right outside of town.

The mold for the engine cover became a bit of a bunker after all my reinforcing. It'll end up a bit boxy since the sides are straight, but I'm hoping some serious fillets will help with that. Now I'll need to get some help turning it over

 

[gm280]

Chilly -20c today! But the sea is still fighting the ice somehow, hope it'll freeze proper so we'd get a chance to ski right outside of town.

The mold for the engine cover became a bit of a bunker after all my reinforcing. It'll end up a bit boxy since the sides are straight, but I'm hoping some serious fillets will help with that. Now I'll need to get some help turning it over

Knowing your abilities, I am certain it will look amazing like everything else you build. :thumb:

 

[Red Herring]

Now it's time for the first gelcoat layer, and tomorrow morning some marathon glassing.

Had to make some custom fillet tools to make the inverted fillets, but the results seem ok at least. Managed to make two extra pieces of melamine a bit slanted inside the boxy mold, so that the shape gets approx 5 inches thinner in the upper part. Hope it'll look ok!

 

[Red Herring]

Phew. I'll glass the rest tomorrow. I wonder if the side walls should get some divinycell as well?

 

[kcassells]

You are a MACHINE!

 

[gm280]

Red, you make this stuff look so easy. I wish I could see you in actually action to see exactly how you do the entire procedure from step one to the finish. :thumb:

 

[Red Herring]

Blargh. Broke my speed record glassing five of those pieces in less than four hours wet on wet(including cutting and fitting of the pieces). The method gets things done but it's messy and hard on the nerves.

Started using a new biaxial mat that's a bit thinner than the last one, and honestly speaking it sucks big time at least for wet on wet layups. It doesn't maintain shape when wet and it's almost impossible to fit nicely on a sticky surface. Will order some new mat as soon as I can.

 

[Red Herring]

Found out why, the old one I had was triaxial 0, 45, 45, that's what I'll have to get

And gm, it's not much to see. The trickiest part is prefitting the pieces(especially wet on wet). I wouldn't have done it like this if I wouldn't have been in a hurry, glassing five layers in one go could lead to warping. I had five layers underneath which should be stable enough to keep it in shape, and I used a very mild mix (1.5%) to minimize heat build up, and the shop is quite cold even (12-14c).