Subject: Re: [harryproa] Crazy rudder idea
From: "Rudolf vd Brug" <rpvdb@freeler.nl>
Date: 11/7/2008, 2:32 PM
To:
Reply-to:
harryproa@yahoogroups.com.au

Hi,
 
The main reason for replacing the original rudder system is that it is not strong enough. We concluded the reason for this is that to obtain a balanced rudder it requires the rudder blade to be angled forward. Problem is there is a lot of torsion in the set up which is hard to calculate and caused things to break. Also when the rudder was pulled up the balance was gone resulting in very high steering loads.
The new rudders are completely new. The old ones can be kept initially for backup but will be surplus when the new system is working.
Plusses for the new set up are the rudder shaft  is vertical so nothing changes when the rudder is pulled up and the beam mounting means the rudders arenītbeing dragged through the water when at speed.
 
I am not the owner of Blind Date, I built her ,profesionally, and I have been asked to do the maintenance and everything. The owner is Jan Schippers who was a gymnastic teacher working with visual impaired children in his working life.
He likes to take pupils and former pupils for a sail and also accompanies classes from his old school when they go skiing and things like that.
 
Rudolf
 
----- Original Message -----
From: George Kuck
To: harryproa@yahoogroups.com.au
Sent: Friday, November 07, 2008 1:03 AM
Subject: Re: [harryproa] Crazy rudder idea

Hello Rudolf,
 
Why are you replacing original rudder system ?
What did you like and dislike abought the original rudders and what will you gain with new rudders mounted on beam ?  Are you going to reuse the old rudder blade and case or build new ones for beam mounted system and leave old system in place as a backup till you have tested new system ?
 
You have a fantastic boat and your work with the blind I can relate to as my father was blind (visually handicapped and gradually went blind).  He had a small sailing kayak,a folbot or similar back in the 50's which he sailed on the Chesapeake bay and taught me how to sail.
 
Happy sailing,
George Kuck,
Chestertown, MD
 
PS;  Do you ever plan on sailing to the Chesapeake bay or any long distance cruising ?.   
 
 
 
 
 
 
--- On Thu, 11/6/08, Rudolf vd Berg <rpvdb@freeler.nl> wrote:
From: Rudolf vd Berg <rpvdb@freeler.nl>
Subject: Re: [harryproa] Crazy rudder idea
To: harryproa@yahoogroups.com.au
Date: Thursday, November 6, 2008, 3:18 PM

I wouldn't have a hinged rudder as you describe, or someone has to prove it can be done first.
Too many parts and things to go wrong in my opinion. Full Size HP rudders have to be very strong, one piece seems to be best.
The huge loads on the rudders calculated for BD have made me think of other solutions, but if two full size rudders work well that may be the simplest solution when shunting and number of parts needing attention for best performance.
Reducing rudder area would make them less vulnerable but has to be compensated.
 
BD will have full size beam mounted rudders. Plan is to  get it sailing next spring.
Rudolf
 
 
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