[Rhodes22-list] centerboard attachment

[Graham Stewart]

I have changed the title of this exchange as it appear the topic has morphed
from the matter of the mast post base to the question of how the centreboard
is attached and how this might result in damage to the cap if the
centreboard is not held in the up position when launching.

My centreboard pivot pin rides in two vertical channels in the housing that
are about 5" long. Those grooves are very clear in the second photo that Rob
Lowe just posted. As I saw it, the channels would allow the pin to be
dropped down to the proper position without the need to insert the pin from
the outside of the housing.  It now occurs to me  that this design might
also have been intended to allow the pivot pin to rise up inside the housing
should the centreboard hit something. Makes sense although perhaps not if
this would allow the centreboard to damage the cap.  

In my case two length of .5 inch rigid PVC  pipe were placed in each channel
above the pin. It appears that these pipes were intended to prevent the pin
from rising up. As I mentioned earlier, I was pretty sure that the cap had
never been removed and assumed, therefore, that the pieces of pipe were part
of the original design. Now I am beginning to wonder if this was some kind
of retrofit by a previous owner who, perhaps, was responding to damage
caused when the centreboard was pushed into the cap. 

I am inclined to leave the pieces of pipe out when I reinstall the
centreboard or perhaps search for something that might act as a shock
absorber but still allow the board to raise up if it hits a solid object.
Perhaps shorter lengths of flexible plastic tubing would work. 

Has anyone else found a similar arrangement in the pivot pin channel? 
Any thoughts?

Graham 


-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Lowe, Rob
Sent: March-06-14 3:13 PM
To: The Rhodes 22 Email List
Subject: Re: [Rhodes22-list] Searching the archives and settled step >now
mast step cb leak

It seems like there are various versions of CB and the lift systems.  Here
are some photos that someone (I forgot who, sorry!) posted of their CB taken
apart. - rob

http://www.rhodes22.org/pipermail/rhodes22-list/attch/200507/14/Getaway1.jpg
http://www.rhodes22.org/pipermail/rhodes22-list/attch/200507/14/Getaway2.jpg



-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Ric Stott
Sent: Thursday, March 06, 2014 2:00 PM
To: The Rhodes 22 Email List
Subject: Re: [Rhodes22-list] Searching the archives and settled step >now
mast step cb leak

Thanks Graham
It might have been cracked when they loaded it onto a trailer to launch last
spring and delivered it to me.
It was a transport trailer.
Sam replied that the pendant had to be cleated when trailered, or it would
cause a crack.
I'd like to understand the mechanics of that reply.
Is the top or aft edge of the CB that close to the cap, and what component
would allow it to move vertically, a hinge pin?
Is there a CB diagram anywhere?
I think it was leaking, but very little until later in the season then
- after a storm, it got much worse.
The boat may have been on the bottom or bounced on the bottom at a very low
tide.
I'll take it apart when it warms up.
Pendant - Braided nylon is very stretchy - is that what we want?
Ric

On Mar 6, 2014, at 1:24 PM, Graham Stewart wrote:

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