Subject: [harryproa] Biplane catamaran
From: "mcrawf@nuomo.com [harryproa]"
Date: 6/5/2018, 12:39 PM
To: <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 

StoneTool,

  The Iriquois 30 with a biplane junk rig looks interesting.  It's edging towards as close as you can get with a catamaran to the safety/simplicity of a schooner-rigged harryproa.

  At one point I was smitten by the Radical Bay 800, but eventually gave it up because there was no way to give it true double bunks, or queens for that matter, without making asymmetric hulls.  The same goes for Cat2fold.  Great designs, but too much money to consider sleeping in a tube if you're sharing a bunk.  And since I've been fixated on a trailerable/transportable boat, a bridge deck doesn't cut it.

  Reasons I like the schooner harryproa (feel free to disagree -- I know you're set on a cat):

  - Less sail blanketing on some reaches. 

  - Ability to easily steer/shunt with the sails in any wind strength, even if both kick-up rudders have somehow been taken out of commission.

  - Easier to launch into the surf on a beat of close reach if you've beached the boat for maintenance (hulls meet the waves at the same time, shunting is more reliable and safer than coming about if the wind is light or heavy).

  - The potential, though no guarantee, of being able to pop back up from a knockdown.

  Other than that, the unstayed biplane catamaran has many of the benefits of the harryproas.

  One word of caution:  those hulls were not designed for the sailing loads of unstayed rigs. 

  I understand junk rigs can be more lightly loaded than bermuda rigs, and that the boat has reinforcements, but it's still something to consult an engineer about.  Those hulls are not very tall, and they were not built to support the full loads of an unstayed mast.  They even have small ports directly next to the mast, and an open area just aft.

  You could reinforce everything with enough additional glass or carbon inside, provided you get the directions right, but that would be a lot of work to get it right on that particular hull design.

        - Mike
   

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Posted by: mcrawf@nuomo.com
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