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Estar

Member Since 03 Dec 2005
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Topics I've Started

Anchor 'twist' link - for the 'big anchor' crowd

14 March 2014 - 07:39 PM

Thought I would put this here, rather than in gear, because the racers will not be interested.

 

I have never had any need for a conventional anchor swivel, but our anchors do come up 'backwards' about half the time, and we have to swing them around with the boat hook to get them to come into the bow roller.  This is awkward with a 50kg anchor.  I have never seen anything that prevents/resolves this until recently.  I just got an Osculati twist - which is basically a "bent link" that shackles to the anchor and forces (by gravity) it to turn 180 degrees if it is coming into the roller backwards. And then there is a swivel to prevent that 180 degree turn from twisting the chain.

 

Attached File  twist.JPG   323.56K   190 downloads


Anchor 'twist' link - for the 'big anchor' crowd

14 March 2014 - 07:39 PM

Thought I would put this here, rather than in gear, because the racers will not be interested.

 

I have never had any need for a conventional anchor swivel, but our anchors do come up 'backwards' about half the time, and we have to swing them around with the boat hook to get them to come into the bow roller.  This is awkward.  I have never seen anything that prevents/resolves this until recently.  I just got an Osculati twist - which is basically a "bent link" that shackles to the anchor and forces (by gravity) it to turn 180 degrees if it is coming into the roller backwards. And then there is a swivel to prevent that 180 degree turn from twisting the chain.

 

 


New "experimental" NOAA site

07 March 2014 - 02:39 PM

They just put this up. It is aimed to be "similar to the capability our forecasters have on their workstations. "

 

http://new.nowcoast.noaa.gov/


Mc38 - can it be made cat 1?

21 February 2014 - 03:06 AM

Looking at the spec sheet they have a number of optional extras to make it cat 2 . . . But is there something fundamental which means it can not be cat 1?

fuel cells, lithium batteries

13 February 2014 - 02:46 PM

Question (out of curiosity and learning)

 

On a top mini or IMOCA - what does the full power system look like today.  

 

I am told that some use fuel cells (methane?) - is that purely a charging source that runs thru lithium batteries, or do they power stuff directly off the fuel cells? I see "the EFOY marine fuel cell acts as a battery charger, monitoring the battery voltage. When the voltage drops below 12.3V the EFOY marine fuel cell will start charging. Once the battery is charged to 14.2V it will enter standby mode." - is that how the IMOCA use it? Does it make sense to reduce battery bank size - eg is the energy density higher or lower than lithium?

 

What is the most common/popular type/mfg/model for the fuel cells and lithium batteries? Are they mostly using hydrogen or methanol, or methane? How easy is the fuel to get?

 

What are the downside of the fuel cells (other than cost) - are their safety issues?

 

For a mini, how do the fuel cells compare to a honda1000 (power to weight), which mini's used to use for longer races?