Boom shaped like a bow - SailNet Community
 
LinkBack Thread Tools
post #1 of 9 Old 12-26-2010 Thread Starter
Junior Member
 
Join Date: Jan 2010
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Boom shaped like a bow

Could someone shed some light on the type of boom I saw that is shaped something like a bow (like a bow and arrow, not the front of a boat). It has two metal spars that have space between them, each one is bent away from each other, creating this bow shape. Any idea what there called?
kirbyc1 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 9 Old 12-26-2010
Senior Member
 
jackdale's Avatar
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 9,032
Thanks: 27
Thanked 59 Times in 56 Posts
Rep Power: 7
 
Nonsuch (Hinterhoeller) built a lot of these.

Quote:
In the mid-1970s, Gordon Fisher, a respected Canadian sailor, commissioned designer Mark Ellis to create a design for a cruising sailboat which would have decent accommodations, but still be easy for a singlehander to manage. Ellis designed a Ljungstrom-type rig modified with a wishbone boom, on a 30 foot modern hull with a plumb bow, fin keel and balanced rudder. A beam of nearly 12 feet and cambered house-top created a large interior with accommodation equal to a standard yacht several feet longer. George Hinterhoeller, after some initial reservations about the design, agreed to build the boats, and the first 30ft Nonsuch rolled out of his shop in the summer of 1978.

__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)

Last edited by jackdale; 12-26-2010 at 01:43 PM.
jackdale is online now  
Quote Quick Reply Share with Facebook
post #3 of 9 Old 12-26-2010
Senior Member
 
Join Date: Aug 2006
Location: Norway
Posts: 856
Thanks: 8
Thanked 63 Times in 58 Posts
Rep Power: 9
 
knuterikt is offline  
Quote Quick Reply Share with Facebook
post #4 of 9 Old 12-26-2010 Thread Starter
Junior Member
 
Join Date: Jan 2010
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Ah yes that is it. The one I saw was much larger. It was on something around the size of a 28-32 ft boat. Why dont more boats use these if they are more efficient?
kirbyc1 is offline  
Quote Quick Reply Share with Facebook
post #5 of 9 Old 12-26-2010
Senior Member
 
jackdale's Avatar
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 9,032
Thanks: 27
Thanked 59 Times in 56 Posts
Rep Power: 7
 
That is a Nonsuch 30 in the photo. They built them up to 36 feet.

__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is online now  
Quote Quick Reply Share with Facebook
post #6 of 9 Old 12-26-2010
Senior Member
 
JKCatalina310's Avatar
 
Join Date: Nov 2010
Location: Randolph, MA
Posts: 164
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
 
Quote:
Originally Posted by kirbyc1 View Post
Why dont more boats use these if they are more efficient?
Some boats do, there are Freedom cat-ketches that use the wishbone boom on both masts. (see below)

I think the main reason they are not used more is that they don't point as well as a sloop rig. I have always liked the look and thought it would be really easy to sail.
Attached Thumbnails
9841335.jpg  

“Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.” -Mark Twain
JKCatalina310 is offline  
Quote Quick Reply Share with Facebook
post #7 of 9 Old 12-26-2010
Member
 
Join Date: Feb 2006
Posts: 83
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
They rely on unstayed masts and in their early years this was mistrusted. I think it's a good, simple rig if most of your sailing is going to be off the wind.

John
john1066 is offline  
Quote Quick Reply Share with Facebook
post #8 of 9 Old 12-26-2010
Senior Member
 
jackdale's Avatar
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 9,032
Thanks: 27
Thanked 59 Times in 56 Posts
Rep Power: 7
 
Another big advantage to the wishbone is the versatility it gives to the interior layout. No bulkhead is needed in the middle of the boat to support the mast and the associated stresses.

__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is online now  
Quote Quick Reply Share with Facebook
post #9 of 9 Old 12-27-2010
baDumbumbum
 
bobmcgov's Avatar
 
Join Date: Jul 2007
Location: Windy Wyoming
Posts: 1,126
Thanks: 0
Thanked 36 Times in 35 Posts
Rep Power: 9
 
Worth noting the Wiki article was written by an advocate; like everything in sailing, wishbone booms have advantages and disadvantages. Certainly they can be fast on small craft -- windsurfers have mucho speed -- and used with a flexy aluminum or carbon stick, they can supply radical prebend useful on small, fast craft. Bet they'd be killer on DN iceboats or Lasers! They are self-vanging and, with lazy jacks rigged off the boom, act like a stack-pack when you reef or drop your sail.

Downsides: you are limited to boom-end sheeting. Where is your vanging ability when boomed far out? Your ability to control twist? Not totally lost, but your snotter isn't going to work as well as a true vang, and you can't apply it w/out outhauling the clew, taking the draft out of your sail. Most performance sailing involves decoupling sail trim features like mast bend, outhaul, and vang; the wishbone doesn't permit that. Apply one, you apply all. Reefing is harder than pulling a sail down to a horizontal boom, the boom's weight is higher off the deck, and you need either a low tack or a high clew to get the most out of the configuration. You cant ease the boom as far on a stayed mast. And so on.

They are clever and a good solution for small boats, but they are not the preferred solution on all craft. If they were, the Volvo 70s would use them, you can be sure.

Buccaneer18, Grainnia
SJ21, Diarmuid
Albin Ballad 30, Fionn
bobmcgov is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Autopilot: S shaped course ichorniy General Discussion (sailing related) 9 07-10-2010 04:04 PM
Recommendations on delta shaped sander? GBurton Gear & Maintenance 10 04-10-2008 01:02 AM
Arc Shaped Hatch hurricanesailing Gear & Maintenance 4 02-10-2008 07:15 PM
Bed linens for odd-shaped berths onboard Zanshin Gear & Maintenance 4 10-03-2006 02:16 PM
Vee shaped Holding Tanks....To pick up some space. chuck711 Gear & Maintenance 1 03-09-2003 05:27 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome