Subject: Re: [harryproa] Crazy rudder idea
From: "Gardner Pomper" <gardner@networknow.org>
Date: 11/6/2008, 11:08 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

Hi,


Yes, I was planning on a 17-20% area in front of the shaft to balance the rudder in either position. Can you refer me to pictures of the kind of swing rudder you have, so that I can compare?

- Gardner

On Thu, Nov 6, 2008 at 11:03 AM, George Kuck <chesapeake410@yahoo.com> wrote:

Hello Gardner,
 
When the rudder swings back the force on the steering control will increase considerably but if you have rudder blade that can be raised verticaly then you will not have this problem.  I have a swing type rudder blade on my TT 720 and when I swing it back for shallow water it becomes vary difficult to control and puts considerable strain on rudder case.  
 
If you can find a way to maintain a balanced rudder then it may work but this may complicate it.
 
Happy sailing,
George Kuck
 
 
 On Thu, 11/6/08, Gardner Pomper <gardner@networknow.org> wrote:
From: Gardner Pomper <gardner@networknow.org>
Subject: [harryproa] Crazy rudder idea
To: harryproa@yahoogroups.com.au
Date: Thursday, November 6, 2008, 10:00 AM

I once owned a one-tonne IOR racing boat from the 1970s, from a designer named Carter. He was known for his swing keels. We had 7000 lbs of lead that gave us a 7' draft when it was down, and a 4.5' draft when it was up. The really neat thing about it was that it was a hydrofoil in both positions.

The reason I bring this up, is that it seems like the same could be done with a rudder. If we took the Blind Date rudder, which is about 5' by 1.5' and hinged it where the rudder post attaches inside the rudder, about 17-20% back from the top and leading edge, it could be used as a deep draft rudder normally, then flipped up (manually or by a grounding) to a 1.5' draft with the same square footage steering surface.

By having the hinge below the water line, we could support the rudder post in 2 places.. the beam and a strut out from the hull.

If we are worried about surface level impacts, the hull strut could decouple and the shaft could be hinged again up higher, near the beam.

It seems that this could be simple to construct, would not have to be as strong (since it has support below the beam) and provides a lot of rudder surface at low speed in shallow water for shunting.

Anyone think this idea might be practical?

- Gardner



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