Subject: Re: [harryproa] Re: farrier folding system (FFS) for a HP?
From: "Michael Gehl mike@vail.net [harryproa]" <harryproa@yahoogroups.com.au>
Date: 6/11/2015, 8:43 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Perhaps a 4-bar linkage (i.e. Farrier type) anchored to a central “toy chest” might do the trick. It would keep the hulls upright when folding.


I suspect the scissor beams would carry a significant weight penalty, whereas the 4-bar has strut triangulation on its side. 

On Jun 11, 2015, at 5:01 PM, Mike Crawford mcrawf@nuomo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:




  The Farrier system would probably end up dumping parts of one or both hulls into the water as it folds -- it's more suited to a trimaran than a boat with two hulls.  Plus, I'm not sure about it handling the sailing loads from the mast.  And if you want to collapse the boat for a marina slip, there's a lot to be said about not having to apply antifouling paint to the hull sides.

  It would be easier to go with either telescoping beams or a scissors-beam like the cat2fold catamaran. 

  The telescoping beams would be simpler and lighter, and would costs less -- not just because of their simplicity, but also because the scissors beams are patented and would require a $1,200 license.

  However, I'd go with the scissors style to make collapsing the boat on the water as easy as possible while singlehanded.

        - Mike



lucjdekeyser@telenet.be [harryproa] wrote on 6/11/2015 4:57 PM:

I suspect it is not that easy to engineer a FFS for a HP as it needs to be about twice as long and hold a heavier hull. Of course, it can be done, but it would not surprise me it is an order of magnitude more difficult and lose its handiness.





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Posted by: Michael Gehl <mike@vail.net>
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