CSC 30 Catamaran- the coastal passage

[Boston]

Thanks for the heads up Cat. epoxy first, then ply, got it.

[Freq1Flyer]

Originally Posted by Boston

Plywoods quick and easy, once you get all your scarfs done, sand and a layer of glass later, your ready to go as near as I can see. Its even easier if you forget the sail rig. Inside passage is all headwind and narrow channels, rocks and current going up and smooth sailing back down. I'd use a two man parasail myself. Rigged kinda like a kite surfer, but attached to the boat..

Oh and forget anything else expensive, I think this things intended as a poor mans get away. Which it seems like it would be perfect at. I'm trying to dream up one just a tad bigger but R Woods has a scooter model you might look at.

Boston,
Here is a very interesting video of a 30' tri Sailing a kite rig!
You aren't far off on your comment!

http://youtu.be/4mFXxroPmqg

Aloha

[david@boatsmith]

Originally Posted by K J Thomas

Getting a finely finished fair hull is a lot easier with ply and 8 oz glass than with any other form of construction.

I gotta laugh at this.....Surely you jest

[david@boatsmith]

Originally Posted by CatBuilder

Question:

Where can one obtain full length, cored GRP panels in the USA? The only manufacturer I am familiar with is ATL Composites in Australia, makers of DuFlex.

Is there a similar product available here?

We can build flat panels. I have had several discussions with Richard about supplying his clients with panels for a kit.

[david@boatsmith]

Originally Posted by Boston

$50 bucks for BS 1088 is a pretty good price for a pretty good material.

I can't buy 1088 at $50 a sheet for even 1/4" I would think that this must be Chinese. I pay $71 a sheet for 5/8" H60 Divinycell, about$10 a sheet more for H80

[Boston]

I'm pretty sure I included a link, its a bulk price, wholesale, I've got a contractors license, and no its not Chinese, I'm really leery of any Chinese products.

[david@boatsmith]

Originally Posted by Boston

$50 bucks for BS 1088 is a pretty good price for a pretty good material. I'm not saying go with CDX. Or am I just misunderstanding you. From what I can gather a cat build under say 50' is structurally 6 one way a half dozen the other using foam core or ply in terms of efficiency so if the ply is cheaper, why not, specially if its your own labor and half the fun is in the building. That and there's a lot less noxious chemicals involved \\

I suppose I just prefer a more natural building material.

No link. I would be very interested in this scource. I like plywood a lot. I ha.ve built many boats of plywood. I like to build boats. I can't build themif I can't sell them It is a whole lot harder to sell a new boat made of wood as compared to a comparable boat built of glass. That's just the way it is. Course these days it's damned hard to make a living building boats of any material.

[Boston]

Hi Dave, not sure were I left that link but I'll find it, I know I wrote it down somewhere but I'd think any of the bulk distributors would have it in that range if your buying the three pallets worth I had spec'd out for that cat design I'm working on.

I'll stumble across it again I'm sure and I'll be sure to send it along.

Cheers
B

[brian eiland]

This is a bit bigger vessel than brought up under the original posting, BUT it is one that would lend itselt to 'flat panel' construction. She is built with saturated wood epoxy method.

I took these original photos back in 2007-8 down near Pattaya, Thailand. Just a week ago March 2012, I had occassion to revist that marina, and WOW I found the same vessel still docked there. She is doing a steady day charter business. I also made contact the crew and got the owners info. He is just having a 2'nd and 3rd one built.

Weekender/Picnic PowerCat

I'll post some more photos I just recently took, as soon as I have time to get them off my camera.

I'll also have some thinks to say about 'flat panel / composite panel' construction materials and technics that I've been looking at for another client, and looked at there in Thailand. Meanwhile have a look at this discussion

http://www.cruisersforum.com/forums/f48/are-cats-made-from-duflex-panel-kits-strong-22948.html" Are Cats Made from Duflex Panel Kits Strong ?

[brian eiland]

Originally Posted by david@boatsmith

We can build flat panels. I have had several discussions with Richard about supplying his clients with panels for a kit.

David, tell me more about yourself and your facilities
...by private email at:

runningtideyachts@gmail.com
Brian

[rob denney]

Originally Posted by peterchech

So since this is a bare bones, quick build kind of boat, what is a faster and/or cheaper to build method than S&G plywood? Are posters here suggesting prefabbed GRP panels?

I went for a sail on an 18m harryproa last week. The owner is a power
boater who decided to try sailing, wanted something a bit different and
decided a harry would fit the bill. He bought the plans for a strip
planked 15m, stretched it to 18, built a table, taught himself infusion and
built it from flat Polycore/glass panels. Not the prettiest boat in the
world, and not completed yet (90% done, 90% to go. ;-)) but he is having a great time, and reckons it has cost less than a pretty boat half it's size.

Polycore is (was, I have not checked for a while) much cheaper than foam. Used with vinylester resin, the panels are low cost and quicker than scarphing ply.

Rather than make a mould quality table, it is easier to make it from formica faced mdf with flash tape over the joins and spray sandable gel coat on as the first coat. This is easily sanded to prepare it for top coat.

To really save time fairing, ensure that all joins are rebated in the infusion. It is much easier to fill and fair a hollow than a hill.

There is a video of the boat sailing at http://youtu.be/LE7jw-yjTmQ and some photos at http://au.groups.yahoo.com/group/har...10865/pic/list



rob

[ImaginaryNumber]

Originally Posted by rob denney

There is a video of the boat [harryproa] sailing at http://youtu.be/LE7jw-yjTmQ and some photos at http://au.groups.yahoo.com/group/har...10865/pic/list

rob

I looked at the video and noticed that in spite of your sailing on relatively flat water quite a bit of water was being thrown up at the bow. What is it like to sail a Harry Proa in strong winds and steep waves?

[rob denney]

Originally Posted by ImaginaryNumber

I looked at the video and noticed that in spite of your sailing on relatively flat water quite a bit of water was being thrown up at the bow. What is it like to sail a Harry Proa in strong winds and steep waves?

The bows were one of the areas the owner decided to experiment with. They are very blunt and are top of the list to be fixed. This is pretty easy as they are a shaped polystyrene block glued onto the watertight bulkhead and glassed over. The job will probably be done on the beach.

The original harrys http://www.youtube.com/watch?v=8chR6DAFjGA had fairly blunt bows, as it was thought that they would sail nose down. They also throw up a bit of water, although none of the owners feel it is enough of a problem to do anything about it. In fact, most of them like it. As nose down has not been a problem, on the latest boats the bows are sharper.

In strong winds, big waves, the boats are dry. As the speed gets up, regardless of waves and wind, the lee bow throws up increasing amounts of water, but little or none of it gets to the bridge deck, and none gets to the steering wheel. The windward bows are also quite blunt and at speed water tends to climb the sides of the boat, run across the deck and over the cockpit cover. http://www.youtube.com/watch?v=5pOsgqrO59A This is very irritating, but is easily fixed with a low ridge around the edge.

The second video also shows a lot of water coming off the external rudders. This reduces significantly when the rudder housings are faired, and is almost non existent on the new boats where the rudders are on the beams, rather than alongside the hulls.

rob