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Damaged keel

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Wild View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 12:42
Yes you are right 
The lead Hanse used is recup material and not clean from dirt and other sh*t.
We have many spots on the lead part where the dirt is breaking out.Angry
Take attention to this.
Wild and Wet
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545e#268
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H8jer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 13:11
The Picture with the lower part of the keel shows Hempel Epoxy Filler which is the most common filler in Denmark for DIY boat works. It is very expensive and RepairYards would probably use a cheaper bulk product.

Hempels Epoxy filler is a good product, but here I think it indicates that it is a DIY job or from a small Yard/Boat Shop?


Hempel Stock Photo of Epoxy filler - When mixed it has the exact same color as Cook's Friends picture:

Hanse 370#487 30HP 3-cabin
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iemand View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iemand Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 17:02
I would definitely take of the keel and sandblast the top to see where all comes from. When you measure the keel bolts threat you should be able to see if the bolts are damaged or not. 
The lead is a different story to me. That is more a shape or a cosmetic thing which you can repair or not. The issue is that the whole lead part is not really protected. normally we should all cover our keels with GRP completely but who is willing to do all the work. Than you have solved the rust issue as well if you are connection the hull and the keel with laminate. 
In the meantime we all fight against small rust spots and the very small crack rust between the lead and the iron but that is really different from the picture from the beginning. 
So take of the keel - better safe than sorry!
Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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Mschesser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mschesser Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2020 at 04:05
What are the bolt torque values for the four, long, M30 bolts that fasten the lower lead bulb assembly to the upper steel fin portion of the keel?
M Chesser, 370, “Red Sky”
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2020 at 09:34
The max torque values depend on the strenght of the bolts, but you will need industrial tools to work with those large bolts. The normal DIY tools are too tiny.
My own torque wrench can manage up to 210 Nm.
This indicates, that to the 30 and 42 mm bolts you need large industrial tools.
It may also be wise to unfasten the bolts one at a time, and only when the keel is on a hard surface.
The steel grade is normally stamped on the end of the nut (8.8 - 10.9 - 12.9).
A M30 in grade 12.9 has a value of 1977 Nm / 1458 ft-lb.

LATEST UPDATE ON THIS MATTER (28/11-2020):
My danish sailor friend has decided to trust the boatyard in the evaluation, that the keel is repaired to a state, where it is as good as new.
He has a report, which tells, that the insurance company will cover any damage happening in the future, which can be blamed on the old mending of the keel.
He even tells me (joking I hope?), that as a kid he sailed with retractable keel, so he expects to be able to reach a port in case his keel falls off.


:Kjeld


Edited by Captain Cook - 28 November 2020 at 22:15
Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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