Subject: Re: [harryproa] Harryproa design page
From: "Rob Denney" <>
Date: 4/12/2008, 3:38 AM


Not silly at all.

Harryproas have 2 rudders in the water all the time, although there is
the ability to lift them if required.  The rudders can be steered
individually or together.  It used together the boats turn quicker
than any catamaran.  They can also be used together to lift the boat
to windward.  This is more a racing thing than a cruising thing, and
even then it is only useful in a few situations where moving to
windward is mor important than boat speed.   It is also handy when you
are being blown onto the dock and only have one engine.  Angle the
rudders at say 30 degrees, put it in gear, and the boat will move away
from the dock.

On race boats, the front rudder can be lifted all the time, except at
very low speeds when steering becomes difficult.  The reduction in
drag with only one rudder is quite noticable.

Hope this answers your question.  If not, let me know.



On Sat, Apr 12, 2008 at 3:14 AM, sa.figueiredo
<> wrote:

 Although I am multihull sailor for many years I never sailed a proa,
 and I know very little about them. As I became interested in the proa
 concept I started to study as much as possible via internet and proa
 groups. Today, I have a reasonable idea how they work, BUT !! there is
 always a "but" you wrote some thing in a article about harryproa
 concept that confused me a lot. You wrote (about the steering/leeway
 reduction) the following
 ".. but eventually simple two balanced rudders were used of a size
 which eliminated the need for centerboards, which can be used
 The concept of two rudder simultaneously in the water is a possibility
 or I misunderstood what you wrote ? Sorry for what, might be a very
 silly question.- Luis



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