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Re: Square Top Sails [Re: Beckit 1824] #275776
10/06/14 09:11 PM
10/06/14 09:11 PM
Joined: May 2006
Posts: 1,382
Kingston SE South Australia
JeffS Offline
veteran
JeffS  Offline
veteran

Joined: May 2006
Posts: 1,382
Kingston SE South Australia
I spoke to the Cobra sailor that's got that Brewin square top and they have come up with a light weight and innovative way to support the mast. He'll know soon enough if it works

Last edited by JeffS; 10/06/14 09:12 PM.

Jeff Southall
Current boats
Nacra 5.8 1703 Animal Scanning Services
Nacra 5.8 1667 Ram Raider
Nacra 18 Square
Arrow 1576
-- Have You Seen This? --
Re: Square Top Sails [Re: Beckit 1824] #275777
10/06/14 09:17 PM
10/06/14 09:17 PM
Joined: Apr 2011
Posts: 101
No Turbulence Offline
member
No Turbulence  Offline
member

Joined: Apr 2011
Posts: 101
it will be interesting to see how the Cobra goes, where will it be sailing, could be worth a drive.


No Turbulence

1774
Re: Square Top Sails [Re: Beckit 1824] #275778
10/06/14 11:29 PM
10/06/14 11:29 PM
Joined: May 2006
Posts: 1,382
Kingston SE South Australia
JeffS Offline
veteran
JeffS  Offline
veteran

Joined: May 2006
Posts: 1,382
Kingston SE South Australia
Rivoli Bay South Aus, you could go to their South Aus v's Vics cat challenge regatta on 1st and 2nd of November and sail against it, normally they get a reasonable number of Mozzys there. All cats off same start none of the split fleet bs


Jeff Southall
Current boats
Nacra 5.8 1703 Animal Scanning Services
Nacra 5.8 1667 Ram Raider
Nacra 18 Square
Arrow 1576
Re: Square Top Sails [Re: Beckit 1824] #275784
10/08/14 11:45 PM
10/08/14 11:45 PM
Joined: May 2011
Posts: 108
Port Hedland
Beckit 1824 Offline OP
member
Beckit 1824  Offline OP
member

Joined: May 2011
Posts: 108
Port Hedland
Don't a lot of the boats who sail sloop already sleeve them? I remember Phil WSs mast was sleeved when it broke at he states.

Luke

Re: Square Top Sails [Re: Beckit 1824] #275796
10/10/14 03:33 PM
10/10/14 03:33 PM
Joined: May 2007
Posts: 416
Matt_Stone Offline
addict
Matt_Stone  Offline
addict

Joined: May 2007
Posts: 416
no, phillip sleeved his and very heavy section, he put a smaller mast section that fitted inside, and the other is neil with a 54mm alloy tube riveted inside up the front of the mast, does work but again very heavy section,

Re: Square Top Sails [Re: Matt_Stone] #275797
10/10/14 04:32 PM
10/10/14 04:32 PM
Joined: Apr 2013
Posts: 858
Victoria Australia
Pirate Offline
old hand
Pirate  Offline
old hand

Joined: Apr 2013
Posts: 858
Victoria Australia
So in reality....

we're using a mast section that even the current legal sail shape/design loads up that section that take it to its uppermost limits of strength and durability.....


if its not the case then why are some people adding internal stiffeners....



50years ago the section probably coped well.... but with far lighter boats and major improvements in sail designs and more modern materials all working off that mast section, perhaps its way past that time we upgraded the section
cool



I guess the next question is how common are mast failures
confused


Yar, & this ere post be done without a sin'le drop o' rum passin' me lips

Kingy
started with Impara Cadet #3 / Mosquito #245
& now Mosquitos #1182 & #1740

Re: Square Top Sails [Re: Beckit 1824] #275798
10/10/14 06:30 PM
10/10/14 06:30 PM
Joined: Apr 2009
Posts: 88
M
Matthew Dawson Offline
journeyman
Matthew Dawson  Offline
journeyman
M

Joined: Apr 2009
Posts: 88
The paper tigers have recently developed an interesting internal sleeve design. You can see it in one of the recent association magazines, which are on the association website. It's neat and inexpensive.


Cobra 570
Cobra 581
Mosquito 126
Arafura Cadet 738
Re: Square Top Sails [Re: Pirate] #275799
10/11/14 04:59 AM
10/11/14 04:59 AM
Joined: Mar 2003
Posts: 943
East Gippsland, Australia
Tim_Mozzie Offline
old hand
Tim_Mozzie  Offline
old hand

Joined: Mar 2003
Posts: 943
East Gippsland, Australia
Quote
we're using a mast section that even the current legal sail shape/design loads up that section that take it to its uppermost limits of strength and durability.....


if its not the case then why are some people adding internal stiffeners....


Because...

About 9 or 10 years ago we had a batch of masts supplied which came out lighter than they had before. Apparently there are tolerances that come in to play when masts are extruded and on that occasion they came out with thin walls and a very thin web. These masts all broke when used with the sloop rig unless they were sleeved. They worked fine for cat rigs (including with spinnaker).

Batches of masts made before and since do not need to be sleeved to make them strong enough.

Other than the lightweight masts, I can't think of an instance of a mast failing. Broken masts are nearly always caused by failure of diamond stays, sidestays, rotation levers, or corrosion.



Tim Shepperd
Mosquito 1775
Karma Cat
Re: Square Top Sails [Re: Beckit 1824] #275823
10/14/14 12:52 AM
10/14/14 12:52 AM
Joined: Apr 2007
Posts: 432
McCrae Y.C. Mornington Peninsu...
S
Simon C Offline
addict
Simon C  Offline
addict
S

Joined: Apr 2007
Posts: 432
McCrae Y.C. Mornington Peninsu...
I'm still using one of the LIGHT sections, I sail virtually every weekend of the season, in all conditions, Cat rigged with kite, and my lanky 100kg hanging off the wire. it's still in one piece smile


Simon
Taipan AUS341
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