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 C250 centerboard raising system - Pictures		  New Topic  Topic Locked
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Initially Posted - 04/12/2008 :  20:31:43  Show Profile  Visit Steve Blackburn's Homepage
Removed my centerboard today for repairs and painting. Thought I might as well document the CB raising system by providing pictures for future discussions.


Centerboard trench under hull (centerboard removed). Wire goes through turning ball at the top and block at the bottom then attach to the centerboard.


Turning ball


Wire goes through the hull (black tube) then through a block on the underside of the cockpit floor then to the purchase system.


Wire inside cabin going and purchase system.
Steve Blackburn, Calgary, AB
C250WB - 1999 - Hull 396
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JohnMD
Navigator

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USA
207 Posts
Response Posted - 04/12/2008 :  22:59:44  Show Profile
While you have it out you might as well replace that cable with the free Vectra line retrofit from Catalina. They tell me it's only a matter of time before the cable fails.
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Response Posted - 04/13/2008 :  00:27:43  Show Profile  Visit Steve Blackburn's Homepage
Good idea, I'll get in contact with them this week. Thanks John.
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bear
Admiral

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USA
909 Posts
Response Posted - 04/13/2008 :  07:10:47  Show Profile
On my pre-launch checklist is an item to load that turning ball up with WD 40 and make sure it is turning.
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Response Posted - 04/15/2008 :  01:26:03  Show Profile  Visit Steve Blackburn's Homepage
How do you remove the turning ball?
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 04/16/2008 :  06:43:42  Show Profile  Visit britinusa's Homepage
Steve, thanks for posting those pics. I think they really show the reason it's difficult to raise the keel.

The keel haul passes around 3 blocks before it arrives at a moving block and then that block and tackle finally pass another block that does nothing except route the force 180 degrees.

Often rethinking the design I came up with this one.

Imagine a piece of 4" PVC piping with a reducer at the lower end that connects to a shortened rubber pipe in place of the existing exhaust pipe.
Now the block and tackle could be rearranged so that the moving end was connected to the vectran and the fixed end to the underside of the cabin step.

This would result in the keel haul passing over 2 blocks for direction and then exerting the force directly to the moving block and thus the vectran line.

The PVC pipe could be loose fitted (perhaps some teflon grease) so that it would be possible to access the lower block, but tall enough to not worry about splash flooding (a no issue if you put a sponge in the top of the existing rubber tube)



Concept pic.



Paul
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lewalskim
1st Mate

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USA
70 Posts
Response Posted - 04/16/2008 :  06:50:44  Show Profile
Steve,
You don't remove the turning ball. It's glassed into place. If it comes out (like mine did) you either have to glass it back in or get the replacement fixture from Catalina that drops down the tube from inside.
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Response Posted - 04/16/2008 :  22:10:09  Show Profile  Visit Steve Blackburn's Homepage
No wonder I was scratching my head trying to figure out how to remove it. I thought I saw plenty of people say they were changing their turning ball. Oh well.

Paul I agree. Less twists and turns is a better design. I would also add 1 extra purchase block making it 2X easier. This way we could raise the keel standing.

In terms of brainstorming how about a drastic concept and loose the whole aparatus altogether replacing it with a winch that could only be accessed from behind the stairs. How often do you really need to be outside to raise or lower the keel?
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britinusa
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USA
5404 Posts
Response Posted - 04/17/2008 :  06:07:23  Show Profile  Visit britinusa's Homepage

The C25 uses a winch under the stairs, they need it as thier 'keel' weighs about 1200lbs+

How about the winch accepting a standard(?) 'winch' handle with the receiver embedded in the companionway stoop?
(the winch would be under the stoop)

FYI, I have used rigging twine whipping to mark the 'Full up' and 'Full down' points on the keel haul.

I wonder if Lowes or Home Depot will sell 18" of 4" pvc or if I'll have to buy a full length?


Paul
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 04/17/2008 :  21:21:36  Show Profile  Visit Arlyn Stewart's Homepage
Hey Paul,

The block and tackle on your boat is setup like the Catalina drawing calls for it but I've issue with their design. With the tackle as is, the entry of the control line is at an angle that induces knots into the B&T and over a period of time those knots cause great amounts of drag in the tackle.

The fix is simple. The upper eye strap should have a twist shackle there... remove it and exchange it for the standard shackle at the lower eye strap. The effect is to rotate the B&T 90 degrees making the entry line fair to the first block. Check your B&T and see if the line isn't twisting knots in it... if it is then make the simple change of location of the twist shackle.
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 04/17/2008 :  22:56:48  Show Profile  Visit delliottg's Homepage
Paul,
I don't know if HD / Lowes will sell you a cut piece of PVC, but any ACE or True Value will (or at least the ones around here will).
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britinusa
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USA
5404 Posts
Response Posted - 04/18/2008 :  08:05:47  Show Profile  Visit britinusa's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by delliottg</i>
<br /> but any ACE or True Value will <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Cool! I'm a card carrying member!

Paul
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britinusa
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USA
5404 Posts
Response Posted - 04/27/2008 :  11:41:07  Show Profile  Visit britinusa's Homepage
Moving ahead with the keel haul project, need some measurements.

Can someone with a C250 Keel haul up system please measure the movement of the vectran line from fully up to fully down.

To clarify the measurement.
With the keel fully down, put a mark on the vectran line level with the top of the exhaust pipe tubing.
Then pull the keel fully up and put another mark.
It's the distance between those two marks that I need to make sure my new system has enough travel.

TIA
Paul
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Response Posted - 04/28/2008 :  10:23:45  Show Profile  Visit Steve Blackburn's Homepage
Not sure someone would be able to measure it after its marked once it goes through the blocks.
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britinusa
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USA
5404 Posts
Response Posted - 04/28/2008 :  11:24:43  Show Profile  Visit britinusa's Homepage
Steve, I have addressed this issue a while back but never did get the distance that the vectran line moves.

I was able to purchase the PVC tubing and PVC reducser to replace the exhaust tube from Lowes. $7.00!!! (they sell 2' lengths of the tubing)

I'm going to relocate the exit block (the one under the fwd edge of the companionway) so that it is nearer to the aft end of the companionway.
It'll mean making about a 2" hole in the tunnel. But that will provide enough travel for the new blocks in the PVC tubing to allow the full travel of the keel.

Paul
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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