Calling All Sail-Math Wizards - SailNet Community
Singlehander by Default

Join Date: Sep 2013
Location: Las Vegas
Posts: 159
Thanks: 7
Thanked 6 Times in 6 Posts
Rep Power: 4

Calling All Sail-Math Wizards

Before we get into this, I readily admit that I suck at math-and geometry too! So, I need to make sure I'm doing this right. I just purchased a Laguna 22 and was going through the sails. I have them all figured out but one--freaking traingles! It is brightly colored and appears to be dacron, and I assume it is a spinnaker, but it doesn't fit any formulas I've found. The measurement of the sail in question is as follows.

Luff- 24.00'
Leech- 21.86'
Foot- 15.66'
SA= 166.99

That much I have figured out, but it doesn't fit any of the spinnaker calculations for size. These are the two formulas I have:

Asymmetrical--I x J x 1.44= 24 x 8.75 x 1.44= 302.4
Symmetrical---I x J x 1.62= 24 x 8.75 x 1.62= 340.2

What I'm wondering is, did someone wrangle this off a smaller sized boat and decide to use it on mine, or do I jsut not know what the hell I am doing?

Spencer
Laguna Windrose 22 "Wind Angel"
Catalina 16

Visit my blog--
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

~~When you decide to become a sailor, you start with a full barrel of luck and an empty cup of experience. The trick is to fill your cup before the barrel runs dry.~~
nighthawk is offline

Old 11-18-2013

Join Date: Oct 2012
Posts: 2,309
Thanks: 2
Thanked 141 Times in 134 Posts
Rep Power: 5

Re: Calling All Sail-Math Wizards

There have been many variations on nylon loose luff sails that are used to reach in light winds. I'm guessing that you ended up with some variation of one of them.

Try it out and see how it works for you, but don't get too hung up on giving it a proper name.

I sold a similar sail that came with my boat and bought a more modern asymmetrical spinnaker.

I'm no longer participating on SailNet.
Alex W is offline
Old 11-18-2013
Just another Moderator

Join Date: Sep 2005
Location: New Westminster, BC
Posts: 18,784
Thanks: 141
Thanked 501 Times in 475 Posts
Rep Power: 10

Re: Calling All Sail-Math Wizards

Does it have hanks or a rope luff? In the smaller boats it wasn't all that unusual to have a genoa in coloured dacron.. Which would mean it's not a spinnaker at all.

From the dimensions it is at least asymmetrical, but if not nylon it's unlikely to be a cruising spinnaker. That would make it a genoa by the look of it, but I'd expect to see the normal headstay connections as any of your other jibs.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline

Old 11-18-2013

Join Date: Jul 2008
Posts: 3,820
Thanks: 14
Thanked 51 Times in 50 Posts
Rep Power: 10

Re: Calling All Sail-Math Wizards

It's a nighthawk-aker, a very rare custom sail.

Regards,

.
.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
.
The best minds discuss sailing (and a little bit of politics). I don't know why. It's a mystery!
.
Bene505 is offline
Singlehander by Default

Join Date: Sep 2013
Location: Las Vegas
Posts: 159
Thanks: 7
Thanked 6 Times in 6 Posts
Rep Power: 4

Re: Calling All Sail-Math Wizards

Quote:
Originally Posted by Bene505 View Post
It's a nighthawk-aker, a very rare custom sail.

Regards,
Thank the Lord--I thought I was gonna have to actually purchase one of those! And they are damn expensive! HEHEHE

Spencer
Laguna Windrose 22 "Wind Angel"
Catalina 16

Visit my blog--
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

~~When you decide to become a sailor, you start with a full barrel of luck and an empty cup of experience. The trick is to fill your cup before the barrel runs dry.~~
nighthawk is offline
Singlehander by Default

Join Date: Sep 2013
Location: Las Vegas
Posts: 159
Thanks: 7
Thanked 6 Times in 6 Posts
Rep Power: 4

Re: Calling All Sail-Math Wizards

Quote:
Originally Posted by Faster View Post
Does it have hanks or a rope luff?
Neither--No side readily identified as a luff or leech and no installed rope. No hanks either, jsut a grommet in each of the three corners, that's what made me think it was a spinnaker. Maybe it was from a smaller boat and the PO decided that it worked on mine--I guess we'll try it out and see. I'll take it out this weekend and verify the measurements and try and put some pics up.

Spencer
Laguna Windrose 22 "Wind Angel"
Catalina 16

Visit my blog--
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

~~When you decide to become a sailor, you start with a full barrel of luck and an empty cup of experience. The trick is to fill your cup before the barrel runs dry.~~
nighthawk is offline
Old 11-19-2013
Senior Member

Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,979
Thanks: 10
Thanked 31 Times in 31 Posts
Rep Power: 12

Re: Calling All Sail-Math Wizards

Lots of folks buy used spin's to try out, IMHO especially ones that are a tad undersized.

Lessons learned are opportunities earned.
chucklesR is offline
Old 11-19-2013
Senior Member

Join Date: Oct 2012
Location: Lancaster Co. PA/ North East, MD
Posts: 830
Thanks: 10
Thanked 21 Times in 21 Posts
Rep Power: 5

Re: Calling All Sail-Math Wizards

S/V Chrysalis
'80 Watkins 27
North East, MD
deltaten is offline
Old 11-19-2013
Senior Member

Join Date: May 2006
Posts: 320
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 11

Re: Calling All Sail-Math Wizards

Where 1 leg is longer than the other I would guess an asymmetrical.
mike dryver is offline
Old 11-19-2013
Just another Moderator

Join Date: Sep 2005
Location: New Westminster, BC
Posts: 18,784
Thanks: 141
Thanked 501 Times in 475 Posts
Rep Power: 10

Re: Calling All Sail-Math Wizards

You stated earlier the sail was made of Dacron... did you mean to say nylon?? That would 'clinch' the spinnaker-of-some-sort debate...

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline

Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.

## Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
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:
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)