Subject: Re: [harryproa] Re: capsize recovery
From: Rob Denney
Date: 6/8/2009, 1:46 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au



The mast should have enough buoyancy to hold the boat at 90 degrees for flat water capsize. 

Add in some waves and some wind pushing it over and it could immerse the mast.  Once immersed, it gets pushed under pretty quickly as the weight of the ww hull pushes it down.  On the bright side, the rig acts as a sea anchor and turns the boat so the mast head is to windward and the wind and waves are trying to right the boat, not capsize it.  This happens very quickly on the little boats, usually before i have managed to get out of the water. 

At some combination of canted mast and weight low in the windward hull, a wind induced capsize will be impossible, the same as it is for a ballasted mono.  Add in waves and it all gets more complicated. 

Sorry there is not an exact answer.  The Chinese production boats have canted to leeward rigs, my 50'ter an offset bearing so it is canted away from the leech (forward when sailing upwind, outboard when running), so we will get a bit more information from these.

regards,

Rob

On Mon, Jun 8, 2009 at 2:00 AM, George Kuck <chesapeake410@yahoo.com> wrote:


Hello,
For self righting I would think the mast should be leaning to leeward around 7 degrees, not to windward.  If mast is to leeward then it will hit water sooner and the windward hull will not have rotated as much, it would then be 14 degrees less rotation to get back to level than if mast is tilted to windward 7 degrees.
 
For the 12 M Harryproa would the mast have enough flotation boyancy if sealed to prevent boat turning turtle ?  How much if any would the mast have to be tilted to leeward for the boat to be self righting. Would it be nesasary to add a floatation ball to the top of mast and if so how big a diameter would be needed.
 
If the Haryproa could be made self righting at least when knoced down with LW hull and mast in water it would be a big advantage for Harryproa. 
 
Happy sailing,
George Kuck
 
PS; I will post some pictures when I get a chance of the float hulls in the next day of two.  Rignt now my broadband connectiion has been acting up and making uploads not work.       

--- On Sun, 6/7/09, Doug Haines <doha720@yahoo.co.uk> wrote:

From: Doug Haines <doha720@yahoo.co.uk>
Subject: Re: [harryproa] Re: capsize recovery
To: harryproa@yahoogroups.com.au
Date: Sunday, June 7, 2009, 7:37 AM

this guy tom goss sounds pretty impressive, OSTAR 1976, 1980..
fire bird in 1998

--- On Sun, 7/6/09, Robert <cateran1949@ yahoo.co. uk> wrote:

From: Robert <cateran1949@ yahoo.co. uk>
Subject: [harryproa] Re: capsize recovery
To: harryproa@yahoogrou ps.com.au
Date: Sunday, 7 June, 2009, 8:48 PM

-Yep ,
# Having the mast on the lw edge of the sole, and leaning the mast about 7 degrees to ww, the boat should be fairly easily self righting. It should be even easier with a bouyant square top on the main or a bouyant panel built into the top section of the sail. Keep the heavy stuff like the anchors and chain, water, batteries nice and low and even better,
regards,
RObert -- In harryproa@yahoogrou ps.com.au, Doug Haines <doha720@... > wrote:
>
> this:
>  
> http://www.youtube. com/watch? v=655COFngiQA& feature=related
>  
> looks like how solitarry might hopefully right itself. good safety insurance.
>  
> doug
>
>



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