Welcome Guest: Login | It is currently Tue Dec 19, 2017 7:10 am

Board index Development & Design Rigs & Sails Mast sections

Moderator: Sabre


Mast sections

Postby Aten on Sun Mar 30, 2014 11:15 pm

Can any one tell me the difference between the mast sections available and how I can identify what section mine is?
Thanks in advance.
Craig
Aten
 
Posts: 87
Joined: Sun Nov 03, 2013 11:39 pm

Re: Mast sections

Postby Daen on Mon Mar 31, 2014 4:28 pm

Hi Craig
From Chris Dance's rigging guide (which can be found here: http://sabre.org.au/australia_documents ... _Guide.pdf )

"Keeley section: Most flexible and lightest
Binks SA: Medium bend and medium weight
John Dixon: Stiffest and heaviest"

From here it all gets a bit murky. Binks apparently has a stock of Keeley sections as well as their own, so you can get a "Binks" or a "Binks Keeley". And since we are working with aluminium, the anodising process affects the weight of the spar and its stiffness, so they probably vary from batch to batch. John Dixon's web site (IECON boats) advertises the ability to tailor the spar to sailor weight, so it may be that he has a range of masts available or is a master of timing the etching process.

I think you'll find that the Keeley section is the current popular choice, but is probably not a universal one. My personal view is that even the softest Sabre mast does not bend enough to get a full range of sail shape, and the Sabre boom and vang are too weak to bend it anyway, so there's no need to have a stiff (i.e. heavy) one. Again that's probably not a commonly shared view. I'm surprised there isn't more analysis of masts and sails (as opposed to hulls) as they seem pretty important.

As for how to tell what yours is - I have no idea! Others may know. If you know who built or set up your boat then someone may know.

Daen (Sabre 1979)
Daen
 
Posts: 12
Joined: Tue Nov 14, 2006 11:58 am
Location: Melbourne, Victoria

Re: Mast sections

Postby Snodge on Wed Apr 02, 2014 10:38 pm

I think you will find that these sections are all off the shelf from manufacturers and these companies are simply adding their names to them. Originally Alcan and Comalco produced them with varied serial numbers. There is also a James Glass section that has a thicker wall and sail track bead which makes it quite a bit stiffer (and heavier).
As to your original question Craig I would think the builder of your particular boat would be easy to track down in WA and ask him what it is/where it came from?
Snodge
 
Posts: 8
Joined: Wed Nov 27, 2013 2:21 pm

Re: Mast sections

Postby harold on Wed Oct 08, 2014 2:18 pm

Hi Craig
Its not correct to say they are all the same section with different supplier names. There are subtle differences in the section particularly in the location and thickness of the web. Its only a millimeter or so but a plug from one mast will not necessarily fit another. The only way i can suggest is to check any ofcuts from a known supplier you can find against yours. The big problem with the mast is making sure your sail is cut for your mast. I saw a big difference when I corrected that problem.
Harold
harold
 
Posts: 22
Joined: Wed Aug 05, 2009 1:05 pm
Location: Australia

Re: Mast sections

Postby Snodge on Thu Oct 09, 2014 8:35 pm

The J Glass Section is DBROO I (this is the stiffest/heaviest with the webbing on the side wall and thicker track bead)

Capral K4621 (I suspect this is the medium stiffness/Binks variety?)

Alcan/Comalco (This may be what Keelys is using as its definately the most flexible and lightest...especially when annodised. Bob Keeley may have/own the Dye for this one)


Boating Hardware would have a Keeley Section and I think a J Glass section for you to compare in Perth.
Snodge
 
Posts: 8
Joined: Wed Nov 27, 2013 2:21 pm

Re: Mast sections

Postby John on Wed Jan 14, 2015 8:03 pm

Most masts used currently and in the past are extruded by Capral including the mast supplied by Bob Keeley
and Binks.
Older Capral masts are heavier and stiffer due to thicker wall probably a result of die wear as this mast has been around a long time and is used in many classes. They can really only be identified by weight.

The IECON mast is extruded in New Zealand and is an intermediate weight between old Capral and New "Keeley" masts It can be identified by an extruded ridge on the outside of the web.

The new "Keeley" mast is the lightest with thinnest wall thickness. Strength is maintained by use of a newly developed alloy.

IECON Boats also produces masts to the weight requirements of the user and these masts are anodised black

All these masts are available from IECON Boats in any configuration from raw section to fully rigged and anything between at very competitive prices. Matching high tensile booms and all fittings are also available

BTW A fully rigged IECON mast came second in the S.A Nationals
John Dixon
IECON Boats
03 9729 1188
0402 008 808
john@iecon.com.au
John
 
Posts: 21
Joined: Thu May 11, 2006 10:25 pm
Location: Melbourne

Re: Mast sections

Postby Brett221 on Tue Feb 10, 2015 10:45 pm

Is anybody using 2mm stays or is 2.5mm 1x19 the best option using hand swaging and thimbles?
Guess next question is: is a single yoke and Jesus shackle attachment the norm or are the go fast guys and gals using tangs and hydraulically swaged eyes?
Brett221
 
Posts: 3
Joined: Sat Dec 06, 2014 11:54 am


Return to Rigs & Sails

Who is online

Users browsing this forum: No registered users and 1 guest

cron