Subject: Re: [harryproa] Wing mast on stub?
From: George Kuck
Date: 11/22/2009, 11:20 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Hello Rob,
 
How are your currently making mast for 12 M Haryproa ?  Is three any way that it could be resin infused, either as one piece or in a mold for a section of mast or stays that would be glued together to form mast ?
 
One thought I had thought of would be to make a mold for 1/3 section and make three sections that would be resin infused and then  bonded together.  It could then get additional uni added as needed and then a final carbon sleeve (or two) added to give additional strength (+ - 30 to 45 degrees) and lock all three sections together as on unit.  I would also like to use vinylester resin with carbon fiber which may be controversial.  What do you think ?
 
Another method would be to use a solid or hollow foam core to mold everything on.  
 
What is your current thinking on building mast for Harryproa ?  Please put pictures up of you next mast project.  Your web sight has little information on how to build mast.  As the free standing mast is a big part of building a Harryproa I expect others would also be interested to know what to expect before committing to building this large of a project.  I assume you plans for Harryproa include building the mast, is this correct and have you updated them recently for easiest construction method ?  
 
Happy sailing,
George Kuck
Chestertown, Md.
 
PS 
 
I came across a reference to you as a "Proa Genius" by Kirt Hughes in his manual on rapid build composite construction. (Also other references I will not repeat from other designers)
 
 
Could this building method be used for your Harryproa's,  combining flat table layup with strip construction ?
 
He also has a proa in his portfolio that has rig that looks the same as your harryproa rig.
 
 
Did you have anything to do with this design ?
 
 

--- On Sat, 11/21/09, Rob Denney <harryproa@gmail.com> wrote:

From: Rob Denney <harryproa@gmail.com>
Subject: Re: [harryproa] Wing mast on stub?
To: harryproa@yahoogroups.com.au
Date: Saturday, November 21, 2009, 9:53 PM

 
I don't like stub masts (heavy, can't get to the top bearing), but where height is limited, they may be worth the effort.   Easy enough to make, as long as the bearing assembly for both bearings is installed in the mast prior to joining it together.  Not a big deal.  Could make the assembly removable pretty easily too, which solves some of  the maintenance issue.

His bearings are spherical, mine are plain. We have had no trouble with these so far.  Suspect you could get a spherical one made for a lot less than 5 grand. 

Half a wishbone is ok if you can stop it twisting, or live with it interfering with the lee side of the sail on one tack.  Not a big deal. 

rob



On Sun, Nov 22, 2009 at 7:32 AM, Gardner Pomper <gardner@networknow. org> wrote:
 
Hi,

I was just http://www.sponberg yachtdesign. com/ looking at his wing
masts. The idea of a stub mast with the wing mast rotating on it
appeals to me for my containerizable boat, so that I can get more sail
area. Will this work with your mast build methods and bearings? I like
the sound of your $350 bearings alot more than his $5000 bearings.

Also, what about his idea of a half-wishboom boom? If I angle the boom
up like that, I could have the clew above the hardtop over the ww
hull, and still have the sail low enough to work on at the lw hull.

Still thinking...

- Gardner
York, PA


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