Boat Building Projects Underway

[Manie B]

Gents the idea of this thread is to have a one stop place where you can look for builds that are underway AT PRESENT. You dont have to be the most active builder but at least share what you got. Maybe this will motivate some folks :D

Who is doing what :D

Big and small - all welcome, as long as you are at it

Here is a start of the sites that i enjoy and have read, and mine, and new stuff

http://www.boatdesign.net/forums/boat-building/my-little-piece-peace-25962.html

http://scrumbleproject.wordpress.com/

http://themanshed.net/tms-20-trimaran.html

http://compaxboats.wordpress.com/

http://blog.lonelybot.com/2009_09_01_archive.html

[Fanie]

Hi Manie,

I am 'at it' as well. Beeeeg fcukin BUT

Couple of problems preventing actual building. This black plague roaming around that can legally kill and thief at their leisure. I can only work evenings outside, so before I can do anything I will have to put up a building to work in safety, That said, I'm not sure I want to stay in this fcuked up place any more. There is no where you can go where there isn't sh1t.

We were recently refused to launch the tri at two beaches - SAS says I'm legal to go, SAMSA's figgin hooligans says they don't know anything about sailboats thus do not allow them. A confrontation with SAMSA had them tell me it's not their jurisdiction, now suddenly it's the department of tourism that is responsible for the fcukup and I must take them on, BUT (and listen to this) if I join a sailing club THEN it would be a different scenario because I can then go out with the club (fcuk again :(). I hear the .AU guys complain about rules and regulations - I doubt it can be this stupid over there.

So Manie, the situation boils down to one that even IF you build the figgin boat you are going to sit on it at home and make lip sounds, but going to water with it you are going to get screwed.

Re the last trip, it would have been cheaper to fly to Mas in .AU and 'holiday' there with him (and pay him) for the week than to waste my money going to the coast here. Since SAMSA started their sh1t, the whole boat thing in SA got fcuked up, and for good reason. They however think they are doing a great job (just like the gov), just make more and more stupid rules and regulations that take any and all liability off'n them and stash it on the poor shit who has to try and do nothing wrong, which btw is impossible.

Bring back the old South Africa. There was less drownings and boating accidents then anyway and no one was deprived of his rights in his own cuntry (F again).

So as you can see I have some things to ponder currently.

[Manie B]

This one has always had a special place in my heart

http://www.boatdesign.net/forums/open-discussion/project-progess-24009-14.html

beautifull pics AND a fantastic story line, enjoy the story from page 1




this one is interesting, sure would like too see what it ends up like

http://www.boatdesign.net/forums/boat-design/my-one-sheet-steel-boat-project-28485.html


so guys start posting links With Photos please i cant remember them all and also those links from SA - Duckworks _ wooden boat etc.
Even the "funny" ones like

http://www.woodenboat.com/forum/showthread.php?t=99253

and the strange ones

http://www.boatdesign.net/forums/open-discussion/build-yourself-boat-do-lap-crazy-not-21058.html

and sad but true the dead ones

http://www.jwboatdesigns.co.nz/plans/sundowner/updates.htm

and the new ones

http://www.microcruising.com/new1a.htm

[Manie B]

Cant find Sven Irvind ???

[ancient kayaker]

another one:

http://www.boatdesign.net/forums/sailboats/small-sailboat-design-advice-requested-26169.html

[Manie B]

Finaly found it - my favorites list is toooooo beeeeeg

Sven Yrvind

http://www.yrvind.com/photos.html

his new build is well underway - wrong way around the horn at 70 years old probably ???

[boat fan]

Hi Manie,

I am 'at it' as well. Beeeeg fcukin BUT

Couple of problems preventing actual building. This black plague roaming around that can legally kill and thief at their leisure. I can only work evenings outside, so before I can do anything I will have to put up a building to work in safety, That said, I'm not sure I want to stay in this fcuked up place any more. There is no where you can go where there isn't sh1t.

We were recently refused to launch the tri at two beaches - SAS says I'm legal to go, SAMSA's figgin hooligans says they don't know anything about sailboats thus do not allow them. A confrontation with SAMSA had them tell me it's not their jurisdiction, now suddenly it's the department of tourism that is responsible for the fcukup and I must take them on, BUT (and listen to this) if I join a sailing club THEN it would be a different scenario because I can then go out with the club (fcuk again :(). I hear the .AU guys complain about rules and regulations - I doubt it can be this stupid over there.

So Manie, the situation boils down to one that even IF you build the figgin boat you are going to sit on it at home and make lip sounds, but going to water with it you are going to get screwed.

Re the last trip, it would have been cheaper to fly to Mas in .AU and 'holiday' there with him (and pay him) for the week than to waste my money going to the coast here. Since SAMSA started their sh1t, the whole boat thing in SA got fcuked up, and for good reason. They however think they are doing a great job (just like the gov), just make more and more stupid rules and regulations that take any and all liability off'n them and stash it on the poor shit who has to try and do nothing wrong, which btw is impossible.

Bring back the old South Africa. There was less drownings and boating accidents then anyway and no one was deprived of his rights in his own cuntry (F again).

So as you can see I have some things to ponder currently.




That sounds a little depressing Fani...


Is it really like that most places ? ..:(


Manie B , have you had this problem ?

Guess we are still the " lucky" country in OZ after all ......

SAMSA ....would that be .......South African Maritime Safety Association ?

[Fanie]

Yes sorry boat fan (and every one else). I could have been half way with my boat and not getting anywhere. SAMSA makes rules and regulations no one can keep up with or comply to. To name only one example, the CE life jackets I have is now not legal any more (no idea why, I guess the SA standards are so high). Ok so I bought a new life jacket for R 1600. Then I got referrred to the meritime notifications regarding life jackets. This states that by law you have to be in posession of a life jacket (for each person of course) that has to have certain prescribed markings on it - none of which appear on the brand new life jacket :( I got told the life jacket I now have is legal, but that's not what is written in the notices which is the law. Now what ?

I like my CE life jackets. I can wear them all day long while fishing, the new life jacket is like a space suit, forget fishing in it.





Manie - I am long overdue on putting some pages up on the cat. We got snowed under completely lately and it didn't occur to me again until you mentioned it. Good idea to bring the thread up as a reminder.

[Fanie]

Is it really like that most places ? ..
I don't know. We were 5 families that went down to the coast, some left early because of the conditions there. I for one would never set my feet there again, closest to rediculous you can find. The previous 6 trips down to various places were also unpleasant due to piracy, theft, and other incidents.

[Manie B]

Ok guys lets get this thread back on track


BOAT BUILDING PROJECTS UNDERWAY

any links? dont you guys read about BOAT BUILDING
any other sites about BOAT BUILDING

surely the above sites are not the only BOAT BUILDING PROJECTS UNDERWAY

i can suggest - SA - Duckworks - Sailworld - TCP - Wooden boat - Das Boot

[lewisboats]

Sorry guy...I have one under way but no blog or current series of pictures. I will try to do better next time I promise :(

[Fanie]

Manie,

The little tri project pages are still there if anyone is interested -
http://www.faze.co.za/Little%20Tri/Little%20Tri.html

I don't have the little tri (called Dugout) any more. Someone came here and said he wants it. It frees some space for the cat.

[jim lee]

Well since you ask..

Here's mine : http://www.leftcoast.biz/iWeb/Left_Coast/Dart_tooling/Dart_tooling.html

Tooling up the Left Coast Dart.

http://leftcoast.biz/justStuff/DartClose.jpg
Here's a picture as a teaser.

And yes I love boat refit & building logs with pix. One of my favorite pastimes is reading them.

P.S. The "No Tomorrows" link on my sig. is a refit log as well.

-jim lee

[jim lee]

Here's one of my favorites : http://www.thebigsailboatproject.com/

I've been following these ladies build this machine from from the time it was a pile of sheet metal out in the woods. Took years but they finally finished it and went cruising this last summer. (Sorry, did I ruin the ending?) :D

-jim lee

[Manie B]

Jeez some nice new stuff - thanks guys - lotsa reading tonight :D

these are older but VERY INFORMATIVE

of the Dudley Dix site - essentially skin over frame - plenty pictures, dig around

http://www.concordia.matav.hu/hajo/test_h.htm

http://www.first-one.nl/

[Manie B]

More here big and small

http://www.dixdesign.com/buildersites.htm

:D

[Manie B]

Well blow me away

inspiring - i'm speechless - two women farkit

I've been following these ladies build this machine from from the time it was a pile of sheet metal out in the woods. Took years but they finally finished it and went cruising

[boat fan]

Ok guys lets get this thread back on track


BOAT BUILDING PROJECTS UNDERWAY





OK WE GET IT:D

http://www.google.com.au/url?sa=t&source=web&ct=res&cd=2&url=http%3A%2F%2Fboatbuild.wordpress.com%2Fabout%2F&ei=7-fDSufmH4HOsgPqu6GrCg&usg=AFQjCNH0iucKf3-1uiqWxRAphdBdzgvqlQ&sig2=pgERJgd1vsARVBMv1oRyyg ( Enough to make you want to build a Stinkboat ! ) :D

http://www.google.com.au/url?sa=t&source=web&ct=res&cd=6&url=http%3A%2F%2Fphw-boatbuilding.blogspot.com%2F&ei=7-fDSufmH4HOsgPqu6GrCg&usg=AFQjCNHpTR4jX8ZDcY5jUBZ2IVfXVi1ZMQ&sig2=edOVXEJ-xWIi02wYOaD07Q

http://northseabuilder.blogspot.com/

http://www.bootbouwer.nl/koppeling.html?ref=/hoogaars.html#/koppeling.html ( Sorry Dutch only , but nice anyway )

[boat fan]

One of the best amateur building blogs ever :


Rikki Tikki Tavi


http://www.svrikki.net/RTT/FrameSet.html

[Fanie]

Manie, I have lots of boat pictures, if you want bring your stick I'll copy them for you. Gimme some of yours then as well.

[Alan M.]

I don't have a blog, but here's some pics:

Day 1:
http://i21.tinypic.com/11m9its.jpg


Day 4
http://i21.tinypic.com/n66kno.jpg


5 days in
http://i21.tinypic.com/op0fmc.jpg


Day 6
http://i20.tinypic.com/8ze4bm.jpg


Day 8
http://i23.tinypic.com/xfx79y.jpg



http://i20.tinypic.com/qo9lxe.jpg



http://i21.tinypic.com/dblik8.png


http://i22.tinypic.com/eraah4.jpg



http://i23.tinypic.com/14tt46g.jpg



http://i20.tinypic.com/zwet10.jpg



http://i22.tinypic.com/no7qc6.jpg



http://i24.tinypic.com/fn74pc.jpg

Galley benches laminated.
http://i22.tinypic.com/10enguq.jpg

Bob's boats are gold! :wink:
http://i21.tinypic.com/2jfzpjo.jpg

Portside forward cabin and head
http://i22.tinypic.com/atrgh2.jpg

Portside forward head
http://i24.tinypic.com/9kz6v9.jpg

Port hull cross double bunk
http://i24.tinypic.com/29vys7o.jpg

http://i18.tinypic.com/82c14jp.jpg

http://i27.tinypic.com/9i9404.jpg

Getting the roof fair was an arsehole of a job

http://i28.tinypic.com/28akcjo.jpg

Came out OK though. The colour is a very pale cream.

http://i29.tinypic.com/vzipn6.jpg

http://i37.tinypic.com/5nup9h.jpg

http://i36.tinypic.com/2zjdslv.jpg

[Alan M.]

http://i38.tinypic.com/2qcfalv.jpg

http://i38.tinypic.com/344s3ll.jpg

Built in composite eyes to attach anchor bridle for normal ancoring or sea anchor deployment. Each eye can take more than double the weight of the boat.

http://i34.tinypic.com/25aj96h.jpg

Some of the fiddly bits:

Composite deck cleats, not quite finished yet:

http://i35.tinypic.com/qqbvcp.jpg

Composite staunchions:

http://i33.tinypic.com/t9jjmu.jpg

Composite lifeline terminal:

http://i37.tinypic.com/3482fiu.jpg

Winch plates:

http://i33.tinypic.com/2nv9ymv.jpg

Starboard helm:

http://i37.tinypic.com/35clrvk.jpg

Motor bracket and cover:

http://i34.tinypic.com/hwgvtw.jpg

Composite chainplate:

http://i37.tinypic.com/2dhbuq8.jpg

Some pics with the shiny paint on.

http://i42.tinypic.com/2v9tate.jpg

http://i41.tinypic.com/1179slh.jpg

http://i39.tinypic.com/31772np.jpg

http://i39.tinypic.com/280r66r.jpg

http://i42.tinypic.com/28h35z4.jpg

http://i40.tinypic.com/29as2fq.jpg

http://i42.tinypic.com/2mywz8w.jpg

http://i44.tinypic.com/28w1poj.jpg

http://i42.tinypic.com/21lu655.jpg

http://i41.tinypic.com/o8a2wl.jpg

http://i43.tinypic.com/2j4re2q.jpg

http://i41.tinypic.com/24qjtjd.jpg

[Alan M.]

http://i26.tinypic.com/2v97mmv.jpg

And some shots of the decks with windows and hatches in.

http://i31.tinypic.com/j9rhub.jpg

http://i26.tinypic.com/205dt3r.jpg

http://i29.tinypic.com/i261s8.jpg

http://i25.tinypic.com/281attk.jpg

http://i25.tinypic.com/2wrq88j.jpg

http://i27.tinypic.com/2yx4srb.jpg

http://i26.tinypic.com/hs48cw.jpg

http://i26.tinypic.com/25pgyzk.jpg

http://i26.tinypic.com/rbh7oi.jpg

http://i30.tinypic.com/2s7tdfm.jpg

http://i26.tinypic.com/316sx35.jpg

http://i27.tinypic.com/2wqafiu.jpg

http://i31.tinypic.com/ranlup.jpg

The "multi function" door
closed:
http://i27.tinypic.com/2mepduv.jpg

Top half bi-folds and lifts off to be stowed away:
http://i29.tinypic.com/2lu751c.jpg

Bottom half opens flat against saloon bulkhead
http://i32.tinypic.com/20udhds.jpg

And can be lifted off too. I plan to fit brakets that will allow the bottom half of the door to be used as a cockpit table.

http://i27.tinypic.com/11vty0k.jpg

http://i27.tinypic.com/168u5ph.jpg

http://i25.tinypic.com/f0ygoy.jpg

http://i32.tinypic.com/r9g7t4.jpg

http://i27.tinypic.com/1znn6mb.jpg

http://i32.tinypic.com/2gtsrgy.jpg

http://i31.tinypic.com/ogxd9g.jpg

Shit there's some money tied up in hatches and portlights!

[jim lee]

Wow! That's cool!!

How long did this project span?

-jim lee

[sabahcat]

Alan, she looks fantastic

You should be very proud.

[Manie B]

Alan your build is fantastic

i have seen these pictures before but cant remember where
was it easy talking or one of the other forums

anyway it sure looks good

what you should please do is start a new tread on DB.net
similar to these

http://www.boatdesign.net/forums/boat-building/my-little-piece-peace-25962-43.html

http://www.boatdesign.net/forums/boat-building/manies-microcruiser-27869-2.html

i am sure MANY of our readers would love to hear more about your beautifull work

[boat fan]

Congratulations Alan .

That really is a job well done . Lovely boat. You must be proud. :cool:

[apex1]

Nice job Congratulations!

[owene]

Here's another one - a 40' Hartley. Started in UK in 1994 and moved the whole affair to NZ in 2002. Now (2009) assembling the hull and hope to turn over by Xmas this year. See www.english-family.net/boatbuild

[Manie B]

Jeez Owen talk about a bugger for punishment.

[Alan M.]

Wow! That's cool!!

How long did this project span?

-jim lee

Thanks everyone. I've been building for 3 1/2 years now, (time flies) and the end is finally in sight!

Pretty much entirely by myself, only had help with obvious bits like hull turnings. Over the entire project I'd estimate I've had maybe 20 hours total of help from other people.

I haven't kept any records but I guess around 4-5000 hours actual hands on work have gone into it. (Thinking about it is almost a 24 hour a day job).

Stuff like running into town to buy screws, hinges, sandpaper etc takes up an incredible amount of time. No doubt if I was better organised I could have cut that down a lot.

[owene]

Nah, it's actually fun - the only worry is that I knew a chap who spent 10 years building a big steel equivalent and when it came time to launch it, he figured he was scared of the sea and refused to set foot on board. I have a very keen son who'll do the relevant certs as well as me so no worries there...! On another subject and rather than start a new thread, has anyone much experience of turning over these wooden hulls?

[owene]

Jeez why can't I find a woman (or two) that will manage what those two did with a pile of steel at http://www.thebigsailboatproject.com/. I could even become a house husband while she/they cut and welded out in the snow!!

[Fanie]

I certainly won't like a woman (or two ;)) wearing a mask all the time.

[owene]

Personally, if any woman can weld, I don't mind what she wears. She can even wear my trousers if she's doing my work!

[wardd]

Jeez why can't I find a woman (or two) that will manage what those two did with a pile of steel at http://www.thebigsailboatproject.com/. I could even become a house husband while she/they cut and welded out in the snow!!


i dont think they'd be interested in you

[Manie B]

I was so blown away by the story that i could even go and cook for those two.

Gents this thread has been amazing, thanks, please keep it up :D

[Manie B]

Alan M. i just had to post this link to your build here

http://www.hostmybb.com/phpbb/viewtopic.php?t=254&mforum=easy

i knew i had it somewhere in my "library" your build has been a great inspiration to me and i think that some of your ideas are fantastic "out of the Box" thinking.

I am sure that the folks here that may not have come across it will most certainly benefit and learn from it.
Enjoy guys, its goooooood :D

[Manie B]

Guys here is a good build with lost of pics of a "basket" built mono, lots of info not sure of the language (Italian?)

http://www.hokahey.eu/site/index.php?option=com_content&task=view&id=86&Itemid=52

http://www.hokahey.eu/fotogallery/index.php?list=1&page=1

just his filleting and corner preparation is a bit wild to my taste :D

maybe its just because i am a nut case for "hospital style" precision :P

strokes for folks ;)

[Fanie]

Boxy Fisher. No boat pictures yet, and I haven't put all the stuff up either.
http://www.faze.co.za/Boxy%20Fisher/Boxy%20Fisher.htm

[owene]

Yeah, still within this thread but a bit more serious - has anyone had the experience of turning a large (35'+) timber hull over? Mulling the options:
1. Two cranes, one pulls and one releases, plenty of internal bracing, totally at the mercy of the crane operator.
2. Mount the hull inside a pair of large octagonal wheels and rotate it by pulling with the tractor. Still require a crane to reloate onto the upright building jig.
3. Mount a hunky eyebolt in the transom as well as the bow and lift with two cranes then turn manually.... ?? hull will weigh around 4 tonnes.
4. Leave it sitting upside down and go off to another 5 year project.

Anyone with any thoughts??

[boat fan]

Hey Fanie the blocks and cleats you made are good .....nothing " cheap skate " about them.


How's that for a decent weld ! The bolts were pushed through the laser cut disk and welded. The bottom disk is loose and fits on the inside of the structure. I made 10 of these cleats. Shop prices would have been many times over what they cost me by making them. Ok I'm a cheap skate, so what. It gives me a lot of satisfaction to make the parts myself.

With quality work like this you deserve to pocket the savings . Well done !

[Commuter Boats]

Yeah, still within this thread but a bit more serious - has anyone had the experience of turning a large (35'+) timber hull over? Mulling the options:
1. Two cranes, one pulls and one releases, plenty of internal bracing, totally at the mercy of the crane operator.
2. Mount the hull inside a pair of large octagonal wheels and rotate it by pulling with the tractor. Still require a crane to reloate onto the upright building jig.
3. Mount a hunky eyebolt in the transom as well as the bow and lift with two cranes then turn manually.... ?? hull will weigh around 4 tonnes.
4. Leave it sitting upside down and go off to another 5 year project.

Anyone with any thoughts??
Though my project was lighter than yours ( composite 36 x 9 ), I turned mine with a small crane and a forklift .

[peter radclyffe]

http://i791.photobucket.com/albums/yy195/helpME7/GOZZO2009012.jpg
heres a boat im building

[owene]

Thanks Commuter, now there's a thought that I can add to the pot - a forklift. By my calculations, I need about 15' of height lift on one side (the beam plus 3' to spare) ... now that's one big shucker of a forklift. But, it's the same principal as two cranes... more food for thought.

[tazmann]

Hello All
Manie B
I just started this one couple weeks ago, 14' microcruiser. Stitch and glue plywood design converted to tack and go aluminum.
Tom

[sailsocal]

I don't have a blog, but here's some pics:



The boat looks great. Can you tell us more about the construction techniques? What is that composite material you are using?

[Alan M.]

The material is Duflex: http://www.duflex.com.au/duflex/

The same as being used in this thread: http://www.boatdesign.net/forums/boat-building/my-little-piece-peace-25962.html

Construction is a variation of stitch and glue using flat panels. It's a fast and simple method.

[sailsocal]

The material is Duflex: [url]
Construction is a variation of stitch and glue using flat panels. It's a fast and simple method.

Did you buy the panels in kit form, with all the hull pieces precut by CNC?
Or did you cut all pieces yourself?

[Alan M.]

A mixture of both. The hull panels and bulkheads were precut. From the sheer up I cut the panels myself.

To add a little difficulty I increased the sheer height by 180mm, for more headroom. (I'm 2 metres tall) So I had to modify nearly every bulkhead.

[sailsocal]

A mixture of both. The hull panels and bulkheads were precut. From the sheer up I cut the panels myself.


It is necessary to bevel-cut the edges of pieces that form curved sections, or do you cut everything at 90 degrees and just fill the gaps with epoxy?

[ecflyer]

I am building a 47' pilothouse ketch out of cold molded wood. I have been working on it for 3 years and expect to launch in spring of 2011. I would enclose a photo but can;t figure out how to get it to this thread.

Have a Great Day!
Earl

[sabahcat]

I am building a 47' pilothouse ketch out of cold molded wood. I have been working on it for 3 years and expect to launch in spring of 2011. I would enclose a photo but can;t figure out how to get it to this thread.

Have a Great Day!
Earl

From FAQ at the top

http://www.boatdesign.net/forums/faq.php?faq=vb_read_and_post#faq_vb_attachment_explain

[ecflyer]

OK, I'll try this. Here hopefully is some photos of my 47' ketch.
Have a Great Day!
Earl

[rugludallur]

Me and my best friend Carl are building a Hout Bay 33 in Iceland, you can check our status on our web page, we also have a live webcam and a gallery section with more pictures than anyone could possibly want to look at.

Site: http://dallur.com/
Webcam: http://dallur.com/index.php?id=129
Gallery: http://dallur.com/index.php?id=44&tx_lzgallery_pi1[showUid]=8

We started by buying the plans from Dudley Dix, then we decided to model the boat in 3D using Rhino 3D, then we decided that since we had the 3D model we should use CNC cutting, so we built a 2x6m plasma cutting CNC table from scratch, and cut everything for the boat. We also built the roller to bend all the flat bars/pipes, a kerosene burner to melt the lead and some other tools and parts.

It's about 7 years since we started the whole process and about a year and a half since we started welding the steel. We are mostly done with the steel work and are currently adding the stainless parts for windows, hatches, railing, etc. Hopefully we will be able to get it afloat next spring.

Jarl Stefansson
jarl@dallur.com

[masalai]

So Manie, lots of inspiration there, get a move on :D:D:D

[judy]

It is necessary to bevel-cut the edges of pieces that form curved sections, or do you cut everything at 90 degrees and just fill the gaps with epoxy?

Looks like Alan has missed your question. We are building the same boat (Bob Oram 44C) so he probably won't mind me answering....

The pre-cut edges (and most of the edges we cut) are angled at 90° and then filled with epoxy. Sometimes (but infrequently) we bevel-cut the edge, especially if access after joining would be difficult.

http://farm1.static.flickr.com/61/188022450_5c31f9c995.jpg (http://www.flickr.com/photos/scrumblecatamaran/188022450/)

[sailsocal]

Looks like Alan has missed your question. We are building the same boat (Bob Oram 44C) so he probably won't mind me answering....


Thanks Judy. In the time since I posted that question, I discovered your web site and read every single page. You and Tom have done a fantastic job building and documenting your project. Thank you for taking time to make this information available to other prospective boat builders.

I don't know if it was on your page, but somewhere I saw a comment that suggested that Duflex boats should not be permanently immersed, and that they need extended haul outs to make sure the core stays dry. Do you know what ATL's official position is on this issue?

[masalai]

sailsocal,
Hi, - - I am building a smaller model to the Scrumble project... ATL advise that DuFLEX laminate is NOT waterproof as manufactured and MUST be carefully sealed (all the minute pinholes must be filled in and closed - several procedures achieve this), and once sorted makes a very light and robust hull.... That stays sealed if done properly...

Check out the ATL website http://www.duflex.com.au/duflex/ (all of it) and if you cannot find the answer, send them an email, and they will respond.... Bob Oram has several designs (power and sail) have a look around there also (Judy maintains his website?)... Judy knows far more than I will ever know on boatbuilding...

Link to my build and Bob Oram Design is in the "signature area" of all my posts

[judy]

(Edit: Sorry Masalai, I didn't see your post before I posted this.)

... somewhere I saw a comment that suggested that Duflex boats should not be permanently immersed, and that they need extended haul outs to make sure the core stays dry. Do you know what ATL's official position is on this issue?

This is the first time I've ever heard this surprising comment! As far as I know, all Bob Oram boats are permanently immersed. "Dog on Cat" is a 48' Bob Oram Duflex boat that has been sailing for over 10 years in tropical waters, with absolutely no core problems.

Hauling out a boat for "off-season" storage is not a common practice in Australia. So when ATL produce and sell Duflex for use in hull shells, it is with the assumption that the boat will remain in the water. This comment about Duflex on their website is worth noting:
Because of the end-grain characteristics, the balsa used in DuFLEX composites panels has good moisture resistance. Water does not migrate across the grain and damage is restricted to areas immediately surrounding the damaged areas.

Note that this is referring to "damaged" Duflex.

Of course, the panels must be sealed, including core replacement around any hardware or intrusions, during the build process.