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Sail Area Of Class Spinnaker

Printed From: Laser 28 International Class Association
Category: Laser 28 General
Forum Name: General Forum
Forum Description: All the topics that don't fit elsewhere
URL: http://www.laser28.org/forum/forum_posts.asp?TID=840
Printed Date: 10 July 2020 at 3:33pm
Software Version: Web Wiz Forums 11.03 - http://www.webwizforums.com


Topic: Sail Area Of Class Spinnaker
Posted By: Jamie
Subject: Sail Area Of Class Spinnaker
Date Posted: 29 April 2020 at 4:31pm
Hi Everyone,

Does anyone know the sail area of the class spinnaker?  

I read through old forum posts and they indicate that the brochure states 670 sq.ft. , "but that number is incorrect".   Nowhere in the post does anyone indicate the actual number.

I need this for my PHRF certificate.  

Any help is appreciated.

Thanks,
Jamie



Replies:
Posted By: fatjohnz
Date Posted: 29 April 2020 at 7:25pm
For your PHRF you should submit the actual dimensions of your largest spinnaker and your pole length.
In the future you might investigate what could affect your rating +/-
john


Posted By: Jamie
Date Posted: 30 April 2020 at 10:41am
Thanks John.   I am going through the process of figuring out all of that now.

Unfortunately, I do not have access to my class spinnaker right now.  I was hoping that someone could tell me how the OD spinnakers are sized.  I have a Doyle spinnaker sold by the Montreal loft back in 2009 or 2010.  

I know that I have a class OD spinnaker as I have seen pictures of my boat sailing in previous Nationals using this spinnaker.

Thanks.

I see the class rules state: 
Max. Luff 10.06 M (33 ft.). 
Max. Girth 5.97 M (19.59 ft).  

Formula:
SF x SL/ 2 + 2(SMG - SF/ 2) SL/ 3.   I have no idea what the SMG is.... 

where: 
SF = Width of foot; measured round the edge of the sail between the lowest point on the leeches. 
SL = Leech length, measured round the edge of the sail from the highest point on the sail at the head to the lowest point of the sail on the leech. If the two are not equal, SL shall be the mean of the two leech lengths. 
SMG = Width at half height; shall be taken as twice the distance between the mid-point of the leech shall be determined by measuring round the edge of the sail half the length of the leech from the head. 


Posted By: Ron Waterson
Date Posted: 06 May 2020 at 4:34pm
Jamie,

Not sure if this will help.  I just stumbled across a NS spinnaker quote for 2018 for my Laser, and remembered your question.  Here is what the quote says.

Isp: 9.671m Area: 52.68m2
Spl: 3.450m


-------------
Hull 147 - Angel's Share


Posted By: Jamie
Date Posted: 08 May 2020 at 9:03am
That does help Ron.   Thanks so much.



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