Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-10-2011, 00:10   #1
Registered User

Join Date: Apr 2011
Location: Karachi
Boat: Woods, Romany, 34ft
Posts: 13
Lightbulb Junk Sail

Has any one experience of using chinese junk sail on a 30 foot and larger catamaran?
__________________

__________________
inamk is offline   Reply With Quote
Old 21-10-2011, 00:11   #2
Registered User
 
James S's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: Yemen & Lebanon... the sailboat is in Lebenon, the dhow is in Yemen
Boat: 1978 CT48 & 65ft Cargo Dhow
Posts: 5,816
Images: 139
Re: Junk sail

Have a look here.
junk rig - Google Search

This is all cruisers forum links.
__________________

__________________
James
S/V Arctic Lady
I love my boat, I can't afford not to!
James S is offline   Reply With Quote
Old 21-10-2011, 08:30   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
Re: Junk sail

I would think at least two things may count:

- the junk rig does not point, many catamarans do not point, there seems to be some synergy here,

- the junk rig is often unstayed, it may be a bit difficult to put unstayed rig on a cat, so you will need one mast in each hull or a stayed rig, with a stayed rig you lose some of the benefits of the junk rig, with two masts you have two masts, two sails, etc.. so you will bear the extra cost,

b.
__________________
barnakiel is offline   Reply With Quote
Old 21-10-2011, 10:18   #4
Registered User

Join Date: May 2009
Location: Europe, looking for the next boat
Boat: VW Land Yacht
Posts: 26
Re: Junk Sail

Somewhere out there in webland I came across a blog of a french couple who built a larger (50+ feet) Wharram and had a pair of unstayed junk rigged masts on it - one in each hull. They were happy with it. I've lost the link sorry. They also had hybrid electric drives, which is how I came across them.

I think the problem with putting one unstayed mast in the middle of a cat is there's not enough structure there for a decent bury, unless you beef up the whole area to the point where the weight gains become unacceptable. Maybe look at how those aerorig cats do it; there are a couple around. Windward performance especially in lighter airs is also, as noted above, reportedly an issue with junk rigs.

I stand to be corrected on this; there is elegance in simplicity, not to mention cost savings. Love to hear from anyone who's made it work.
__________________
ocean_groover is offline   Reply With Quote
Old 21-10-2011, 10:37   #5
Registered User
 
Sand crab's Avatar

Join Date: Oct 2010
Location: Gig Harbor, WA
Boat: 34' Crowther tri sold 16' Kayak now
Posts: 3,157
Re: Junk Sail

The aerorigs were generally mounted on top of the salon and penetrated through down to the cabin sole which gave it enough "bury" to support the unstayed mast. There is at least one cat with twin aerorigs with one in each hull. A junk rig could be done the same way but why would you want too. The great thing about cats is they are generally faster than their mono cousins. You wouldn't want to build the slowest multi ever. Cat2Fold and others have done unstayed winsurfer type rigs in each hull. There are 2 multis for sale built out of steel (a cat and a tri) so a junk rig would probably be third slowest. BOB
PS It is good to ask the question.
__________________
Sand crab is offline   Reply With Quote
Old 21-10-2011, 18:51   #6
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,576
Re: Junk Sail

All you might want to know:

All in the Same Boat: Amazon.ca: Fiona McCall, Paul Howard: Books
__________________
S/V Alchemy is offline   Reply With Quote
Old 21-10-2011, 23:02   #7
Registered User

Join Date: May 2010
Location: near San Jose, CA
Boat: Yankee Dolphin 24'
Posts: 113
Re: Junk Sail

I owned a cat with unstayed junk rig in each hull. Fat, shallow hulls with inside leeboards. The masts were too far forward, requiring the hulls to be fat forward to support the weight of the solid, unstayed masts, and the leeboards didn't line up straight. It was a bear to tack, and forget it in light winds. in strong winds she did very well on a close reach, broad reach, or dead down-wind. SF-Bay conditions were good to sail in, It wouldn't have done any where near as well in a lighter wind area. It looked like it was "inspired" by (older) Wharrams, with soft beam mounts and an open cocpit & deck between the hulls. It was built much heavier than it looked -- you hit the dock, the dock yields... And that was probably another reason that it didn't sail very well. But, boy, was the junk rig easy to manage!
__________________
tenchiki is offline   Reply With Quote
Old 21-10-2011, 23:36   #8
Registered User

Join Date: Apr 2011
Location: Karachi
Boat: Woods, Romany, 34ft
Posts: 13
Re: Junk Sail

My idea is to use the Junk Rig only in good winds on my 36ft displacement hull profile power cat which is designed to have a 120 hp diesel. max speed 14 knots, economic cruising at 10 knots.

The unstayed mast would be suitably supported and anchored in the bottom of the saloon. I expect to have the building started next month in a local boat yard which have been building wooden boats of up to 100 ft for the past 100 years.
__________________
inamk is offline   Reply With Quote
Old 24-10-2011, 14:49   #9
Registered User

Join Date: Aug 2011
Posts: 74
Re: Junk Sail

Get a modern unstayed squarehead sail with a wishbone boom.
__________________
HapaPops is offline   Reply With Quote
Old 24-10-2011, 20:37   #10
Registered User

Join Date: Sep 2008
Location: USA
Posts: 151
Re: Junk Sail

Quote:
Originally Posted by tenchiki View Post
I owned a cat with unstayed junk rig in each hull.
More information about Tenchiki's "Dragon Wings"
Dragon Wings
Dragon Wings

Pete Hill's "China Moon"
The Shipping News at TownDock.net (history)
http://groups.yahoo.com/group/junkri...19041/pic/list (have to join group to see photos)
http://www.catamarans.com/images/lis...ChinaMoon2.jpg

Bertrand Fercot's two wing sail Wharram's. Not exactly junk-rigged, but they have some similar characteristics.
Bertrand FERCOT's Blog - Wharram Builders and Friends

You can use Google to find out more about them.
__________________
ImaginaryNumber is offline   Reply With Quote
Old 31-10-2011, 17:11   #11
Registered User

Join Date: May 2009
Location: Europe, looking for the next boat
Boat: VW Land Yacht
Posts: 26
Re: Junk Sail

TIKI 46 - 2009 - 2010 & 2011 - On the water + tuning

46 foot Wharram with twin junk rig. Interesting analysis of issues and their resolution.
__________________

__________________
ocean_groover is offline   Reply With Quote
Reply

Tags
sail

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cruising on $500 per Month . . . goprisko General Sailing Forum 3094 24-03-2012 23:32
Sail vs Power in the PNW Jd1 Our Community 16 20-10-2011 12:39
Stupid Questions - Sail Measurements JimGo General Sailing Forum 4 12-09-2011 14:02
Challenge: Is it Possible to Sail on the Main Only ? coyfish9906 Challenges 52 09-09-2011 07:04
For Sale: Parasailor 2.0 (67sqm) - Brand New isolamia Classifieds Archive 1 12-08-2011 04:51



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:56.


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.