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Keel support when boat in cradle

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robh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote robh Quote  Post ReplyReply Direct Link To This Post Topic: Keel support when boat in cradle
    Posted: 14 November 2018 at 04:18
Blue Horizon is being lifted out soon and stored ashore in a cradle. I want to clean and recoat the underside of the keel bulb with coppercoat but to do that I would have to support only part of the keel on a block. Once this section has cured I would then need to move the block support to do the remaining section.

In the past I have always supported the boat on a block the whole length of the keel bulb but has anyone ever done this with only a small percentage of the keel on a block, or can you tell me if it is safe to support the keel on just a percentage of the bulb?


Cheers,

Rob
"Blue Horizon" Hanse 341#113 Portsmouth Harbour UK
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Carlosailfan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Carlosailfan Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2018 at 06:49
Hello Rob,

ours is always on a nice cradle with the keel only on 2 wooden blocks so i can (not so easy ) reach the 70 % of the underside. Later when the boat is on the lift to put it back in the water i just have to paint the last 2 sections. From the technical perspective if the keel should brake when he is put on only 2 wooden blocks I rather prefer this happens on shore and not during sailing. Means there was already an issue. I discussed this point with my dealer seen i had the same thoughts as you but they confirmed me, no problem. 
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/C
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robh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote robh Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2018 at 13:25
Hello Carlo, thank you for the positive feedback you have confirmed my thoughts exactly. As you have done this for real and had dealer approval this gives me the confidence that all should be well. I thought I will place the blocks equally spaced towards the back and front of the bulb and try to get another one around 20mm thinner than the two supporting the boat in the middle, so should the main ones fail the boat is not likely to fall over.
 
Cheers,

Rob
"Blue Horizon" Hanse 341#113 Portsmouth Harbour UK
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Carlosailfan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Carlosailfan Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2018 at 14:19
Hi Rob,

this is the way my dealer puts the keel on the cradle.




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/C
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2018 at 16:55
Just a point but f your boat settles in mud in a marina or if you sometimes rub the bottom when entering the marina then there is no point putting coppercoat on the bottom.
My keel sits in about 450mm of silt at some states of tide when I am in the marina & the mud just kills the coppercot dead.
I found (& the manufacturer agrees) that it is better to put a couple of coats of erodable antifoul paint on this part as it sheds the mud better when sailing.
Also as I tend to push through the mud sometimes because I am often a bit late or arrive into the creek leading to our marina in the dark it just scrapes the coppercoat off & it is a relatively easy job to touch up the antifoul paint when the boat comes out to clean the weed off coppercoat every 10 weeks
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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robh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote robh Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2018 at 17:48
Hello guys,

Carlo, thanks for the photo that is roughly how I was considering supporting mine, so good to see this placement works. I am also considering that once the coppercoat has hardened over a period of a couple of weeks lifting the keel just enough with wedges so I can remove or reposition the initial blocks and apply antifoul to the other bits. 

Samuel, that is a good point but Blue Horizon is moored in a 3 metre deep marina pontoon for most of the time when not out sailing. I do put her on our scrubbing grid at least once a year to check anodes and blast off any slime, so the coppercoat on the bottom could get damaged in this process. However as it is an epoxy coating I would think there would be little removed most likely cracked, so should still work. Anyway, it would be better than what I have on the bottom of the keel currently which is nothing. so the only antifoul is contact with the surface of the grid crushing any squirts and barnacles.

Cheers,

Rob
"Blue Horizon" Hanse 341#113 Portsmouth Harbour UK
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2018 at 17:59
Rob
Do not make the mistake of trying to do it now. It is far too cold & condensation at night will kill it dead unless you are applying inside a heated building. I made that mistake & had to do it all again even though the temperature did not fall below 11 degrees & i did not think it was damp at night.
I am about to re do my keel for the third time & will wait until after easter 2019
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote echoofwight Quote  Post ReplyReply Direct Link To This Post Posted: 17 November 2018 at 09:36
Rob, Echo is always supported by two blocks under he keel, very similar to the earlier photo. In fact all boats in Port Solent are laid up this way. I can always antifoul most of underneath the keel.

Steve Jacobs Echo of Wight
Steve. Hanse 341 Echo of Wight, . Deep draft and rudder, white hull, Single aft cabin. Raymarine instruments. Furuno radar. Garmin AIS. Wheel Steering,   Portsmouth.
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robh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote robh Quote  Post ReplyReply Direct Link To This Post Posted: 21 November 2018 at 20:58
Thanks Guys.

Samuel, that is good advice. I was not intending to do the copper coat now but early next year when it's warmer. When I do I will be taping a waterproof and insulating cover in place around the base of the keel to keep any damp out and maintain a reasonable temperature.

Steve, your feedback on the support I intend to use being similar to that used in Port Solent increases my confidence that my plan is workable.

Thanks again for the feedback.



Cheers,

Rob
"Blue Horizon" Hanse 341#113 Portsmouth Harbour UK
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