Subject: Re: [harryproa] survival in heavy seas
From: Rob Denney
Date: 2/6/2014, 12:13 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

On Wed, Feb 5, 2014 at 10:19 PM, Gardner Pomper <gardner@networknow.org> wrote:
 

I have built hulls like that already. I just can't figure out how to build rudders. Mike, if you are in the MD area, you can have the hulls. Or, if somebody can explain to me how to build the rest of it, I would be interested in trying things out.
 
- Gardner

Couple of ideas. 1)  Hang the rudders off the beams, same as on Elementarry, etc.  2) Use beach cat rudders and mount the pintles on the side of the hull,  3) Build them in housings in the hull, same as the big boats are now doing. This is pretty easy with ply sided hulls, but you will need to get inside to beef them up, so may need to remove and replace some deck.   4) I am building a small kite boat at the moment to see what works and what doesn't, having found many things that didn't when I kited in El and an old Laser.  

It has a leeboard and a half round rudder in a case at each end.  The half round rotates around a pin across the bottom of the case, which is set at 15 degrees off fore and aft.  When it is up, there is nothing under the boat.  When one is rotated up to 90 degrees, it protrudes beneath the boat at an angle and turns the boat.  The other end turns it the other way.  I will probably end up with 2 in each end as the bow is often airborne.   Advantages are that nothing sticks below the hull except when you want to turn, it kicks up if you hit something and is pretty easy to build.  Downside it you need 2, probably 5 cases.  

Anything I can do to help with your rudders, let me know.

rob

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