[Rhodes22-list] centerboard attachment

[Ric Stott]

AH HA!
A Picture's worth 1000 words.
The pivot pin lives at the bottom of the vertical channels.
On Graham's boat, someone, Stan or a retrofit job, installed pvc stops  
to prevent the CB from rising and hitting the cap if (when) aground.
Although it is less likely, the stops could damage the cap as well.
A straight on grounding would not cause damage because the CB simply  
swings back. But if the CB was in the down position and the boat came  
down on the ground, as it could in big waves, or if the tide went out.  
the CB will sooner or late ride up the channels and hit the cap - CRACK!
Unless the CB  needs to have some play to function smoothly, which  
doesn't seem necessary based on Grahams pvc stops, its a good idea to  
install something to prevent it from rising. What doe Stan use these  
days?
I'm thinking hard rubber, glued in, but might interfere with a smooth  
operation if it was challenged and came loose.

On another related note, I've seen emails pertaining to caulk on the  
gasket.  As a cyclist, I glue rubber racing tires on rims with special  
glue.
I think tis basically rubber cement.
These tires are called 'tubulars'. They are kind of a tire and tube in  
one, and glued onto the rim as opposed 'clincher' type tires.
It comes off to change the tire, but not easy, and the glue can be  
cleaned off.  Seems like the prefect solution for this application.  
Has anyone tried that?

Ric
Dadventure
Hampton Bays

On Mar 6, 2014, at 5:41 PM, Graham Stewart wrote:

> 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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