[Rhodes22-list] bumped : capsize discussion continued, masthead float?

[Goodness]

Nice find.  Auto inflator mast head for racing dinghy.



On Aug 24, 2012, at 9:28 AM, Mike C <hmcheung57 at gmail.com> wrote:

> Sorry if this is an inappropriate bump, but the quotes and reply chain were
> getting kind of long.
> 
> First regarding capsizes.  I really do think the Rhodes 22 qualifies as self
> righting, but in shallow water any sailboat can be "screwed" by having her
> mast stick in the mud.  Even flooded, I would expect the Rhodes to right
> herself.  To stay capsized, the boat has to be stable upside down or held
> (like by a mast stuck in the mud).  Upside down, even a flooded Rhodes would
> have the ballasted keel sticking up and any perturbation would let that keel
> seek a lower position, righting the boat.  
> 
> As for the intriguing idea of using a masthead float, especially an
> inflatable one; see
> 
> http://www.grabner-sports.at/Masthead-float.1675.0.html?&L=2
> 
> Don't know if you could get one shipped to the US, but it's been done.
> 
> Lastly, for those on a mooring or just those worried about a capsize; a poor
> man's float could be easily made using a 5 gallon bucket with a tight
> fitting lid hoisted up the mast with a halyard.  Coincidentally, the volume
> of the inflatable float the link above points to is 20 liters, just about 5
> gallons.  If a little more volume were desired, your local homebrewers store
> will have 7 gallon buckets and lids.  However those lids will be drilled for
> an airlock!  That's a small hole, easily sealed up.  How much volume is
> actually needed?  I don't know, it could be estimated if the forces at work
> in pushing the mast down could be calculated or estimated.  The force that
> the bucket provides is about the density of water times the volume, so like
> 40 lbf for the 5 gallon bucket and 56 lbf for the 7 gallon bucket.
> 
> 
> 
> -----
> Mike Cheung
> s/v Muireann
> --
> View this message in context: http://rhodes-22.1065344.n5.nabble.com/bumped-capsize-discussion-continued-masthead-float-tp43938.html
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