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470e keel - survey results

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colinc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote colinc Quote  Post ReplyReply Direct Link To This Post Posted: 03 February 2021 at 19:45
If they say no leakage then that isn't a problem.   It is impossible really to tell that just looking at the photos.   Ditto whether paint is old or new.   The surveyor is the one to rely on.   They have hands on and experience.

So show surveyor the photo of keel construction, and if they still say so, follow investigation advice - assuming current own allows.

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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: 03 February 2021 at 19:57
Originally posted by marabou marabou wrote:

Hi Colnic,


I assume the surveyor did not know that the stock hanse keel bolt plates are made of aluminium, hence no paint necessary in principle?




I do not believe the keel counter plate is aluminium 
On our 545 they are galvanized steel fixed in epoxy 

Wild and Wet
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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: 03 February 2021 at 20:22
if you have a GRP innerliner (l think all Hanses except the 470) the plates should be stainless steel
On the Hanse 470 you have a steel innerframe galvanized. I assume that the keel is bolted directly to that fram but not 100% sure. 
Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marabou Quote  Post ReplyReply Direct Link To This Post Posted: 28 February 2021 at 11:27
I would like to thank everyone for their contributions.

We did a sea trial in ideal testing conditions and the bilge stayed dry.

Indeed the steelwork had been painted silver but no evident signs of corrosion. The keel bolts & engine mounts looked undisturbed with no signs of a grounding.

The 470e has been bought, see you all in the water!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2021 at 01:48
Good luck with the new member of your family. Thumbs Up
If the thru-hulls are older than 8-10 years, you should plan an exchange. The vertical crack should be rinsed of the corrosion, and closed again.
It was mentioned, that the keel bolts are of stainless steel. That does not sound realistic. SS has more carbon in the mix, and is weaker than normal steel. In my H400 the ten M40 bolts and the plates are made of zinc-plated steel. Have a look at my 15 year old bolts: (The blue stuff is Loctite). Update: If you believe that your bolts are SS, prove it with a picture. The difference is plainly visible.




Edited by Captain Cook - 01 March 2021 at 09:05
Freya H400 #27 (2006), 40HP 3JH4E, Teak deck, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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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: 01 March 2021 at 08:15
I am pretty shure that the keel bolts are Stainless steel and not galvanized. Although your are right in saying that galvanized steel is stronger.

BR Thomas
Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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