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Square tops - how big?


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#1 hounddog

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Posted 13 November 2017 - 01:16 PM

I'm just in the design stage for a main to replace the aging Dacron main on my R930.

 

Definitely going to a square top as the rig is free of a backstay and was designed with one in mind.

 

Question is how big to go? Anyone switched to a square-top with any advice. I've picked up that you can go a bit bigger because of the way they twist off, but not sure how big to goon an already reasonably tender boat.

 

Sailing will be mostly harbour courses and coastal stuff. 


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#2 Willow

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Posted 13 November 2017 - 01:43 PM

Is it the Standard Keel or modded? 

 

Find the fastest one with a similar keel and Rig and copy them, no point experimenting unless you have loads of cash to blow.

 

http://racetrack.org....php?classid=15


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#3 Black Panther

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Posted 13 November 2017 - 01:47 PM

Pretty much no limit, just need a stiff top batten

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#4 philstar

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Posted 13 November 2017 - 02:01 PM

The keel isn't the major thing as there are lots of standard keel r930's running square top mains.

Too big a square top creates drag which negates the extra speed produced. 

 

The good thing is that R930's have been doing square top mains for a while now and the sail makers arn't experimenting too much any more. 

Get quotes from the major lofts and compare pricing and laminates. talk to the owners and see what they say. 

 

airship and testarossa have pretty nice evolution square tops. 

norths make a really nice square top too currently on no worries ( i think), pepe and a few others. 

I have a pretty nice doyles square top on rafferty rules

 

I'd be more worried about the laminates they're using. The biggest difference in the last few years is that the laminates have gotten better ( apparently) with the new stratis and norths 3di laminates getting much longer life.

If you're pinging several grand on a laminate mainsail you want it to last several years of hard racing and the old laminates are not that durable. 

I've seen fairly new ish laminate sails from various lofts fall apart sooner than I would have liked. 


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#5 waikiore

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Posted 13 November 2017 - 04:02 PM

Only one of the 930s had an uncontrolled square top but that seems to have disappeared, ETNZ are doing a bit of work in this area at the moment-and as others have commented all the cloth and sailmakers are getting better at them, of course BP has the answer gaff or for the ultimate a large lugsail.  


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#6 hounddog

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Posted 13 November 2017 - 04:37 PM

Thanks heaps,

The boat has the old keel.

Will look at what testarossa is running.
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#7 Changed

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Posted 13 November 2017 - 06:51 PM

Had 12% first and then stepped up to 20% ( foot length). Thing you will notice most is the ease with which you can control ragging when the breeze gets up. Wouldn't go back to a pin head.(Ross 8.5m)


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#8 hounddog

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Posted 13 November 2017 - 07:24 PM

Had 12% first and then stepped up to 20% ( foot length). Thing you will notice most is the ease with which you can control ragging when the breeze gets up. Wouldn't go back to a pin head.(Ross 8.5m)


Magic! Looks like most of the 930’s are in 20% range too.
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#9 Knot Me... maybe

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Posted 14 November 2017 - 06:31 AM

My new one is 350mm, that's all the Ross boat ex owner/sailor sail maker would put on his own boat.

 

930's don't like leaning over.

930's will heel 5 degrees if you have a big sneeze.

Be careful not to over cook the sail area.


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#10 Ptown

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Posted 14 November 2017 - 07:22 AM

Good choice. I was going to say that the North one on Hotdogger is the nicest I've seen and it'd be about 350mm. Agree on the sneeze. I still don't have a square top and cat3 have to run the class main and still have not seen any obvious disadvantage, but we've got a few options to stay powered up. Geeze you must be close to getting her back in the water if you're buying sails! 


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