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Anti-Rolling Chalks for 45' Defever

DD
David Davis
Tue, Feb 10, 2009 1:55 AM

We have a 45' Defever pilot house that we enjoy very much. The one down
side is the rolling of the displacement hull when we are off shore in
the Pacific North West. I recently visited with a commercial fisherman
friend who operates a 60' steel trawler. He installed "anti rolling
chalks" of approximately 20' in length that stick out and 18" to 24"
inches from the hull. He has had good luck with these especially when
traveling off shore from Oregon to Alaska.

Dose anyone on the list have experience or knowledge of this type of
stabilization?

I would appreciate the input.

Dave Davis

Florence, Or

45' Defever

We have a 45' Defever pilot house that we enjoy very much. The one down side is the rolling of the displacement hull when we are off shore in the Pacific North West. I recently visited with a commercial fisherman friend who operates a 60' steel trawler. He installed "anti rolling chalks" of approximately 20' in length that stick out and 18" to 24" inches from the hull. He has had good luck with these especially when traveling off shore from Oregon to Alaska. Dose anyone on the list have experience or knowledge of this type of stabilization? I would appreciate the input. Dave Davis Florence, Or 45' Defever
RB
Roger Bingham
Tue, Feb 10, 2009 9:35 AM

Hi All

I am not familiar with the term "chalk" in this context.

Are we talking bilge keels?

Regards

Roger Bingham
France

Hi All I am not familiar with the term "chalk" in this context. Are we talking bilge keels? Regards Roger Bingham France
JA
Jim Ague
Tue, Feb 10, 2009 1:19 PM

I am not familiar with the term "chalk" in this context.

Proper spelling for this term is its homonym "chock".

-- Jim

> I am not familiar with the term "chalk" in this context. > Proper spelling for this term is its homonym "chock". -- Jim
W&
Wesley & Patty Eldred
Tue, Feb 10, 2009 3:03 PM

I am afraid we are continuing to abuse this term.  A chock is used to
control the location and lead of a line, an anchor stowed on deck or a boat,
often a small boat, that is out of water.  As other listees have noted, this
thread refers to bilge keels.

Regards

Wesley
wpeldred@comcast.net

----- Original Message -----
From: "Jim Ague" ague@usa.net
To: "Roger Bingham" rjbingham@orange.fr;
trawlers-and-trawlering@lists.samurai.com
Sent: Tuesday, February 10, 2009 8:19 AM
Subject: Re: T&T: Anti-Rolling CHOCKS for 45' Defever

I am not familiar with the term "chalk" in this context.

Proper spelling for this term is its homonym "chock".

I am afraid we are continuing to abuse this term. A chock is used to control the location and lead of a line, an anchor stowed on deck or a boat, often a small boat, that is out of water. As other listees have noted, this thread refers to bilge keels. Regards Wesley wpeldred@comcast.net ----- Original Message ----- From: "Jim Ague" <ague@usa.net> To: "Roger Bingham" <rjbingham@orange.fr>; <trawlers-and-trawlering@lists.samurai.com> Sent: Tuesday, February 10, 2009 8:19 AM Subject: Re: T&T: Anti-Rolling CHOCKS for 45' Defever >> I am not familiar with the term "chalk" in this context. >> > Proper spelling for this term is its homonym "chock".
JB
John Blackburn
Tue, Feb 10, 2009 11:38 PM

I've got a 44 DeFever and she's rolly.  My concern with bilge keels (and
I got a degree in Naval Architecture back when we used slide ruls.  No
Computers!) all cargo ships and most Naval vessels had bilge keels, even
tankers, though I always wondered why you would even worry when your
hull looked like a  2 x 4 floating on its side.... but if you're getting
hauled out by a carry all, wouldn't a great proporation of the weight of
the boat (in my case 22 tons!) be carried in the sling on those 2 x 4's
glassed onto the turn of the bilge, right where you would want a bilge
keel.  That's why I never followed up, because putting them on was the
first thing I thought about when I took a stiff wake on the beam.  I'm
looking at a picture of my boat up on the hard and I've always wondered
where I would put them?  She's realllllllly round!

I just thought of all the internal structure I would want to beef up the
bilge and dropped the thought.  The only other option would be to make
the bilge keel discontinous and establish a " put slings here" area.
That's two breaks in the keel.  Not too sure what it would do to crusing
speed or fuel consumption but it couldn't be good.

A steel hull would be no problem, I would think.

I sure want to see Bob's setup.

John Blackburn
44 DeFever "Yak Rack"
Deale, MD

I've got a 44 DeFever and she's rolly. My concern with bilge keels (and I got a degree in Naval Architecture back when we used slide ruls. No Computers!) all cargo ships and most Naval vessels had bilge keels, even tankers, though I always wondered why you would even worry when your hull looked like a 2 x 4 floating on its side.... but if you're getting hauled out by a carry all, wouldn't a great proporation of the weight of the boat (in my case 22 tons!) be carried in the sling on those 2 x 4's glassed onto the turn of the bilge, right where you would want a bilge keel. That's why I never followed up, because putting them on was the first thing I thought about when I took a stiff wake on the beam. I'm looking at a picture of my boat up on the hard and I've always wondered where I would put them? She's realllllllly round! I just thought of all the internal structure I would want to beef up the bilge and dropped the thought. The only other option would be to make the bilge keel discontinous and establish a " put slings here" area. That's two breaks in the keel. Not too sure what it would do to crusing speed or fuel consumption but it couldn't be good. A steel hull would be no problem, I would think. I sure want to see Bob's setup. John Blackburn 44 DeFever "Yak Rack" Deale, MD
SH
Scott H.E. Welch
Wed, Feb 11, 2009 2:12 AM

"Wesley & Patty Eldred" wpeldred@comcast.net writes:

I am afraid we are continuing to abuse this term.  A chock is used to
control the location and lead of a line, an anchor stowed on deck or a boat,
often a small boat, that is out of water.  As other listees have noted, this
thread refers to bilge keels.

For what it's worth, this may be a regional thing. I live on the east coast
and have always known bilge keels as "bilge keels". However my boat (a 60
foot DeFever) is on the west coast, and everybody there, from the surveyor to
the guys in the shipyards, refer to the bilge keels a "rolling chocks". In
fact, they were even referred to as "skookum rolling chocks", which is how I
discovered that "skookum" is not a fancy type of bilge keel but is in fact
something that is extra-special heavy duty.

Scott Welch
Product Manager, Open Text Collaboration Solutions Group
www.firstclass.com

"Things turn out best for people who make the best of the way things turn
out." - John Wooden

"Wesley & Patty Eldred" <wpeldred@comcast.net> writes: >I am afraid we are continuing to abuse this term. A chock is used to >control the location and lead of a line, an anchor stowed on deck or a boat, >often a small boat, that is out of water. As other listees have noted, this >thread refers to bilge keels. For what it's worth, this may be a regional thing. I live on the east coast and have always known bilge keels as "bilge keels". However my boat (a 60 foot DeFever) is on the west coast, and everybody there, from the surveyor to the guys in the shipyards, refer to the bilge keels a "rolling chocks". In fact, they were even referred to as "skookum rolling chocks", which is how I discovered that "skookum" is not a fancy type of bilge keel but is in fact something that is extra-special heavy duty. Scott Welch Product Manager, Open Text Collaboration Solutions Group www.firstclass.com "Things turn out best for people who make the best of the way things turn out." - John Wooden
RT
Richard Tomkinson
Wed, Feb 18, 2009 4:04 AM

Some interested in this topic will find this site usefull as there are
examples of stability solutions and discussion regarding relative
effectiveness.

http://www.brayyachtdesign.bc.ca/

Note especially the Amnesia article and the article on stability.
Richard

Some interested in this topic will find this site usefull as there are examples of stability solutions and discussion regarding relative effectiveness. http://www.brayyachtdesign.bc.ca/ Note especially the Amnesia article and the article on stability. Richard