Modifying a Single Screw Rudder
This is a slow speed boat question! Those with 2 engines, 1000hp &
cruise of 20k can skip to the next message!
Has anybody with a full displacement, single screw boat ever modified
the rudder by the addition of end plates and/or wedges on the
trailing edge to improve the the slow speed handling? Dave Gerr had
such an article in the August 2006/September 2006 issue of
Professional BoatBuilder. (http://www.proboat-digital.com/proboat/
200608/) Very interesting comments about articulating rudders, flat
plate rudders etc. and rudder design. The suggested modifications to
a flat plate rudder seem relatively simple and should be easy to do.
Before I take the plunge, the admiral, thinks I should check w/
somebody who has modified their (boat) rudder or knows of someone who
has. Have seen several commercial seine/troller/gill net boats with
wedges and a few with end plates, but I've never talked with any of
those folks so don't really know why they were modified.
A chance for a new thread of vital importance :)
Thanks,
Tom
Aventura
KK-42 #204
krogenguy@comcast.net
Tom,
I helped a person last winter take his one rudder slow boat and,
using Dave's article, make an EXACT duplicate of it and convert to
two rudders, one rudder post. The owner thought that putting a second
rudder would be easier to "tune" than one with a adjustable tailing
edge.
He is now quite surprised how responsive his boat now handles...
From what I remember, the Port (original) rudder is tilted about 3
degrees inboard, Starboard about 2 degrees. I understand he got to
these settings by backing down and trying to go "straight" back with
the rudder "amidships."
He also says his auto pilot works less, and when coming into a
marina, he can really swing tight....
Lee
On Sep 30, 2007, at 5:47 PM, Krogenguy wrote:
....
Has anybody with a full displacement, single screw boat ever modified
the rudder by the addition of end plates and/or wedges on the
trailing edge to improve the the slow speed handling? Dave Gerr had
such an article in the August 2006/September 2006 issue of
Professional BoatBuilder. (http://www.proboat-digital.com/proboat/
200608/) .....
[demime 1.01d removed an attachment of type application/pkcs7-signature which had a name of smime.p7s]
Tom:
We have a new-to-us 60-ft custom steel trawler, single-screw, and are in
the process of making rudder modification (articulation) to address issue
of control at low speed, particularly in following seas. (She has bow &
stern thrusters). Work will get done within next 2 weeks, at the shipyard
where the vessel was built - Yachtsmiths Int'l in Nova Scotia, and using
design ideas described in October PMM. Design work completed, by E.Y.E.
Marine in Halifax, N.S.
Total estimated cost - design, material, fabrication, haul-out,
installation etc around 8 B.U. They are using parts of the existing
rudder.
Hope to report back on initial impressions shortly. Full assessment only
next year. But if resuts are anything like those achieved on the Nordic
Tug, should be great.
Good luck with your decision.
Michel
Has anybody with a full displacement, single screw boat ever modified
the rudder by the addition of end plates and/or wedges on the
trailing edge to improve the the slow speed handling?>Thanks,
Tom
Aventura
KK-42 #204
krogenguy@comcast.net
Good luck, Tom. When I tried to get a thread started on the rudder design
topic awhile back I think only one person had a comment. FYI, the Sept, 2007
issue of Passgemaker has an article on the articulating rudder if you didn't
already know. It just makes sense to me that a fishtail design would work
better than a flat plate but to what degree? I had the fishtail rudder design
on my previous twin engine DeFever 45 and it was good at responding to rudder
position but I don't know how much better than a flat plate design.
I now have a single engine Mariner Seville 37 pilothouse on order and I have
requested that the standard flat plate rudder be changed to a fishtail design
as per Dave Gerr's article that you made reference to. I am also thinking of
having an articulating rudder installed on the new boat at commissioning by
Bayview Edison but I haven't really got serious about this yet. How about you
doing this first and let me know how it works?
Ron Nelson
Port Orchard, WA
----- Original Message -----
From: Krogenguymailto:krogenguy@comcast.net
To: TWL TWLmailto:trawlers-and-trawlering@lists.samurai.com
Sent: Sunday, September 30, 2007 7:47 AM
Subject: T&T: Modifying a Single Screw Rudder
This is a slow speed boat question! Those with 2 engines, 1000hp &
cruise of 20k can skip to the next message!
Has anybody with a full displacement, single screw boat ever modified
the rudder by the addition of end plates and/or wedges on the
trailing edge to improve the the slow speed handling? Dave Gerr had
such an article in the August 2006/September 2006 issue of
Professional BoatBuilder.
(http://www.proboat-digital.com/proboat/<http://www.proboat-digital.com/probo
at/>
200608/) Very interesting comments about articulating rudders, flat
plate rudders etc. and rudder design. The suggested modifications to
a flat plate rudder seem relatively simple and should be easy to do.
Before I take the plunge, the admiral, thinks I should check w/
somebody who has modified their (boat) rudder or knows of someone who
has. Have seen several commercial seine/troller/gill net boats with
wedges and a few with end plates, but I've never talked with any of
those folks so don't really know why they were modified.
A chance for a new thread of vital importance :)
Thanks,
Tom
Aventura
KK-42 #204
krogenguy@comcast.netmailto:krogenguy@comcast.net
You may find this link works easier :-)
http://www.proboat-digital.com/proboat/200608/
Mervyn Carr
905-338-2902 (home)
905-921-2802 (mobile)
-----Original Message-----
From: trawlers-and-trawlering-bounces@lists.samurai.com
[mailto:trawlers-and-trawlering-bounces@lists.samurai.com]On Behalf Of
Ron Nelson
Sent: Sunday, September 30, 2007 12:29 PM
To: Krogenguy; Trawler World
Subject: Re: T&T: Modifying a Single Screw Rudder
Good luck, Tom. When I tried to get a thread started on the rudder design
topic awhile back I think only one person had a comment. FYI, the Sept,
2007
issue of Passgemaker has an article on the articulating rudder if you didn't
already know. It just makes sense to me that a fishtail design would work
better than a flat plate but to what degree? I had the fishtail rudder
design
on my previous twin engine DeFever 45 and it was good at responding to
rudder
position but I don't know how much better than a flat plate design.
I now have a single engine Mariner Seville 37 pilothouse on order and I have
requested that the standard flat plate rudder be changed to a fishtail
design
as per Dave Gerr's article that you made reference to. I am also thinking
of
having an articulating rudder installed on the new boat at commissioning by
Bayview Edison but I haven't really got serious about this yet. How about
you
doing this first and let me know how it works?
Ron Nelson
Port Orchard, WA
----- Original Message -----
From: Krogenguymailto:krogenguy@comcast.net
To: TWL TWLmailto:trawlers-and-trawlering@lists.samurai.com
Sent: Sunday, September 30, 2007 7:47 AM
Subject: T&T: Modifying a Single Screw Rudder
This is a slow speed boat question! Those with 2 engines, 1000hp &
cruise of 20k can skip to the next message!
Has anybody with a full displacement, single screw boat ever modified
the rudder by the addition of end plates and/or wedges on the
trailing edge to improve the the slow speed handling? Dave Gerr had
such an article in the August 2006/September 2006 issue of
Professional BoatBuilder.
(http://www.proboat-digital.com/proboat/<http://www.proboat-digital.com/prob
o
at/>
200608/) Very interesting comments about articulating rudders, flat
plate rudders etc. and rudder design. The suggested modifications to
a flat plate rudder seem relatively simple and should be easy to do.
Before I take the plunge, the admiral, thinks I should check w/
somebody who has modified their (boat) rudder or knows of someone who
has. Have seen several commercial seine/troller/gill net boats with
wedges and a few with end plates, but I've never talked with any of
those folks so don't really know why they were modified.
A chance for a new thread of vital importance :)
Thanks,
Tom
Aventura
KK-42 #204
krogenguy@comcast.netmailto:krogenguy@comcast.net
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