Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 01-02-2008, 12:28   #1
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Catharsis 26

Starting to build Catharsis 26, a small catamaran for Baltic sea coastal cruising. There are some pictures in gallery. The most boats here at the forum are big and for blue waters. Are there any small boat cruisers here? How do small boats get over on cruising?

Catharsis 26's LOA is 8.0 m, BOA 5.0 m and empty weight under 1000 kg. The structure is infused glass and polyester over nidacore honeycomb. Any question or comment are wellcome.

Terho
__________________

__________________
terhohalme is offline   Reply With Quote
Old 01-02-2008, 13:20   #2
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,579
Images: 240
Terho's gallery is at:
http://www.cruisersforum.com/gallery...mageuser=10473
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 04-02-2008, 08:53   #3
Registered User
 
Tnflakbait's Avatar

Join Date: Apr 2006
Location: Southern California
Boat: CSK, 33' Aita Pe'ape'a
Posts: 338
Images: 7
Looks like a cool boat. Do those hulls plane?
__________________
Tnflakbait is offline   Reply With Quote
Old 04-02-2008, 10:00   #4
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Thanks. She is designed for (fast?) cruising and good load capacity. The hulls are not ultimate slim, L/B ratio is 8.2.

Eternal question, does a sailing multihull plane? Sure she can easily reach twice the hullspeed, but is it planing? Is the boat mainly supported by hydrodynamic or hydrostatic force? Nevertheless I am expecting speeds above 14 knots. Someone would say yes, do that...
__________________
terhohalme is offline   Reply With Quote
Old 22-04-2008, 08:53   #5
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Hello,

Resin infused (at last) first nidaplast (nidacore) sheets for Catharsis. Nidaplast is 10 mm thick with one layer of 850 g/m2 multiaxial 0/90 glass on both side. The laminate is quite dry and nice, panel weight is 4.3 kg/m2.

Infusion was quite easy, though building the sack is some time consuming. A simple ejector made desent vacuum (75-80%) and we made resin trap from the 5 liter tank of pressure paint gun. Resin is Reichhold Polylite 506-677 for resin infusion, 1% MEKP gives more than two hour infusion time. Wetting time over the sheet (1.2 m) is about one hour. We use flowing net and peel ply.

Just over a hundred sheet more to infuse for two catamarans...

Terho
__________________
terhohalme is offline   Reply With Quote
Old 22-04-2008, 12:56   #6
Registered User
 
Nordic cat's Avatar

Join Date: Jan 2008
Location: Denmark
Boat: FP Tobago 35
Posts: 721
Nice looking boat you have there Terho. I especially like the cockpit and the bimini, but the layout is also very practical,

I'm sure that there is a market for this kind of boat up here in the Baltic area.

There is a Finnish guy who built a 26 ft. Shuttleworth a few years ago, with a similar layout, but this looks more up to date.

Regards

Alan
__________________
Nordic cat is offline   Reply With Quote
Old 22-04-2008, 16:01   #7
cruiser

Join Date: Aug 2005
Location: No longer post here
Boat: Catalac Catamaran
Posts: 2,462
Quote:
Originally Posted by terhohalme View Post
Starting to build Catharsis 26, a small catamaran for Baltic sea coastal cruising. There are some pictures in gallery. The most boats here at the forum are big and for blue waters. Are there any small boat cruisers here? How do small boats get over on cruising?Terho
I sail a small cruising cat. At 8 meters she is the smallest catamaran I've seen with twin Yanmar diesels. On the other hand, performance wise, my boat is old and slow compared to what you're building.

Photos are on my web site.
__________________
Tropic Cat is offline   Reply With Quote
Old 23-04-2008, 08:44   #8
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Thanks, Alan

Yes, I know the guy. A long a go he was one of my students at wooden boat school... very determined and capable.

Don't know about the markets, there just isn't any new small cruising cat on production.

Rick,
What a good site you have! Catalac 8 is a classic and about two times heavier than Catharsis 26...
__________________
terhohalme is offline   Reply With Quote
Old 23-04-2008, 09:50   #9
Registered User

Join Date: Jan 2007
Posts: 135
Quote:
Originally Posted by terhohalme View Post
Hello,

Resin infused (at last) first nidaplast (nidacore) sheets for Catharsis. Nidaplast is 10 mm thick with one layer of 850 g/m2 multiaxial 0/90 glass on both side. The laminate is quite dry and nice, panel weight is 4.3 kg/m2.

Infusion was quite easy, though building the sack is some time consuming. A simple ejector made desent vacuum (75-80%) and we made resin trap from the 5 liter tank of pressure paint gun. Resin is Reichhold Polylite 506-677 for resin infusion, 1% MEKP gives more than two hour infusion time. Wetting time over the sheet (1.2 m) is about one hour. We use flowing net and peel ply.

Just over a hundred sheet more to infuse for two catamarans...

Terho
G'day,

Boat looks good. Well done.

Are you infusing each 2.4m sheet individually? How will you join them to get the full length? Are you rebating the edges using the hot iron approach on the Nidaplast site, or will you be doing a lot of bogging? How are you sealing the edges at the chines?

regards,

Rob
__________________
rob denney is offline   Reply With Quote
Old 23-04-2008, 12:24   #10
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Hi Rob,

All the hull sheets will be infused to full length on the long table. The long nida sheets are NC machined before infusion. Normal sheets (bulkheads and so) are NC machined after infusion, so far the quality is superb.

Then the long sheets are taped together in jig with -/+45 biaxial and polyester. Then we will glue all the bulkheads. The places of bulkheads are marked by small NC holes inside the hull sheets. The outside seams will be filled with vinylester bulkhead glue (similar to microspheres+resin) and then taped.

Yep, lot of filling, sanding and painting, but I used the same method with my ping-pong proa. The original idea was to glue only the nidasheets and then infuse the entire hull, but nida is too bendy for that.

Using thermoplastic characters of nida would be nice and perhaps we'll use that somewhere inside the hulls. This design was originally for plywood and we just replaced ply with nida (cheaper and lighter).

Terho
__________________
terhohalme is offline   Reply With Quote
Old 23-04-2008, 13:26   #11
Registered User
 
Nordic cat's Avatar

Join Date: Jan 2008
Location: Denmark
Boat: FP Tobago 35
Posts: 721
Some pictures and descriptions as you go along would be great. How do you handle the edges of the Nidacore? Don't they absorb alot of resin? Some close-ups of how you connect the panels will be good.
What are you going to make the mast out of?

Regards

Alan
__________________
Nordic cat is offline   Reply With Quote
Old 24-04-2008, 09:04   #12
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Resin is the cheapest material here. Absorbtion is 8 mm on average in one joint. On the edge slightly more and mixed by microballoons. No big deal.

The mast is a commom aluminium profile. Fast fittings, easy to get and reliable. A carbon rotating wing mast maybe later...
__________________
terhohalme is offline   Reply With Quote
Old 05-07-2008, 11:12   #13
Registered User
 
dcstrng's Avatar

Join Date: Oct 2007
Location: Virginia
Boat: Oday30-B24
Posts: 579
Images: 51
Quote:
Originally Posted by terhohalme View Post
Starting to build Catharsis 26, a small catamaran for Baltic sea coastal cruising...

Just ran across your images in the photo gallery… That is one impressive looking little Cat… I shall enjoy following your progress, because if I ever turn to multihulls, it will be a smaller one… Am currently halfway through Thomas Firth Jones’ book on multihull voyaging – one of the few multihull writers/designers (Woods, I think, being another…) who seems to be saying that with a little design caution and common sense, modest-sized multihulls can get the job done…

Anyway… good looking design… good luck!
__________________
Larry
dcstrng is offline   Reply With Quote
Old 05-07-2008, 11:37   #14
Senior Cruiser
 
sandy daugherty's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: near Annapolis
Boat: PDQ 36 & Atlantic 42
Posts: 1,178
Very pleasing design. If you are going to use an aft mounted outboard, I hope you can leave room to rig a steering system for the motor.

I sailed the Aquilon 26 several years ago, loved it, and I still believe there is a market for a boat this size if it could be delivered for about the price of a Telstar Tri.
__________________
sandy daugherty is offline   Reply With Quote
Old 03-08-2008, 08:59   #15
Registered User
 
terhohalme's Avatar

Join Date: Jan 2008
Location: Finland
Boat: Catharsis 27 under construction
Posts: 33
Images: 1
Catharsis 26 progress

Hi all,

Most of the sheets (approx. 150) for two catamarans are infused and nc-cutted. They are piled and numbered and waiting for the students to construct them up to the hulls when the school year starts.

Terho

ps. we changed her name to Catharsis 27 after redesigning the bows.
Attached Thumbnails
Click image for larger version

Name:	Infusion in process.JPG
Views:	387
Size:	314.5 KB
ID:	4535   Click image for larger version

Name:	Deck test.JPG
Views:	413
Size:	379.0 KB
ID:	4536  

Click image for larger version

Name:	Mast bulkhead.JPG
Views:	501
Size:	381.4 KB
ID:	4537   Click image for larger version

Name:	Bulkheads.JPG
Views:	289
Size:	181.0 KB
ID:	4538  

Click image for larger version

Name:	Hull sheets.JPG
Views:	266
Size:	164.3 KB
ID:	4539   Click image for larger version

Name:	catharsis 27 accommodation 3.png
Views:	340
Size:	159.8 KB
ID:	4540  

__________________

__________________
Only shared knowledge can grow.
terhohalme is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:04.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.