Subject: Re: [harryproa] Re: Design your proa
From: Rick Willoughby
Date: 5/16/2011, 9:46 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Rudolf

There is performance merit in resisting leeway with a non-ventillating foil or foils.  Once this is achieved it does not matter much how the boat is steered unless the rig is poorly balanced.  I am now thinking dipping rudders a little more sophisticated than what Tarawa is using would be my starting point. 

The other conclusion is that a slab sided or very deep V (> 45 degrees) hull will be as effective at resisting leeway as ventilating rudders.  So a reasonably elegant solution is exactly what Tarawa has in concept.  It could be engineered with a bit more precision.

Rick
On 16/05/2011, at 11:16 PM, Rudolf vd Brug wrote:

 



 
 
Arto,
 
That's exactly what I was wondering:
to keep thing as simple as possible could a keel with two small retractable rudders work well?
And I mean a keel put onto the same hull you would use having boards, not a deep hull like Tarawa as that would have more wetted area.
 
Can you say anything about that Rick?
 
Rudolf
----- Original Message -----
Sent: Monday, May 16, 2011 2:04 PM
Subject: Re: [harryproa] Re: Design your proa

 

 
 
3) A comment, not a question: what you have said here seems to make sense to the traditional proa lee hull design with almost flat leeside and curved windward side like this Gary Dierking's Tarawa design: http://homepages.paradise.net.nz/garyd/tarawa.html .When working with no foils it must have been the most effective hull form.
 
 
Arto 0419 104 821




Rick Willoughby
03 9796 2415
0419 104 821

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