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470e keel - survey results

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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 Topic: 470e keel - survey results
    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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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: 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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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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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 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 

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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote marabou Quote  Post ReplyReply Direct Link To This Post Posted: 03 February 2021 at 19:37
Hi Colnic,

Yes, we had a survey carried out, in fact it was them who sent us the photos. Their findings were:

Re: keel bolts area painted gray
"No yellow or black epoxy seal but grey paint (see pics), but it looks like original or been in place for a long time, no cracks or leakage."

Re: keel crack
"There is a +/- 5cm crack in the keel, I would suggest grinding this crack to see what caused it to crack (see overall pic and detailed Keel crack pic)."

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

Also the survey was done outside the water so there was no real way to test for leakage...

Thanks again for your replies - we are going to carry out a sea trial to check for leakage. In the meantime, any thoughts are very welcome.


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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 19:07
Have you had a survey done?  If so what do they say?  If not, it is very advisable to do so - if not essential.
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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 13:45
Eric Forner on Mallorca used to be a great specialist. You should ask the original Hanse dealer aobut the water tank on this boat. there where tanks leaking because of poor welding. if this boat had a major tank repair than the bilge would have seen water. 

I wouldn't be concerned about this problem however I would always sail this boat and check any movement on the keel anyhow.

The window crack on the keel must be repaired properly otherwise you have salt water in the keel which will not cause structural problem but you will see rust coming through.

BR Thomas
Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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marabou View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marabou Quote  Post ReplyReply Direct Link To This Post Posted: 03 February 2021 at 10:48
Thank you very much everyone, very much obliged. A little update:

I have been in contact with the owner and asked for their survey (when they bought it, last summer).

Their reply was that they don't have an official survey - they inspected the boat themselves, and that this paint and crack issues should not trouble us. They haven't painted the keel plate and it didn't trouble them. Overall they have been very polite with me and no 'red flags' appeared so far during the sale. Also to state, that other than this, the boat is in near perfect condition.

However, based on your replies here on the forum plus the opinion of an experienced broker / surveyor in Athens who looked at the photos, I am having reservations proceeding with the purchase, fearing an expensive repair bill in case salt water is entering the keel bolt plate area.

The options I am considering now are:
1) Locating the previous owner in Spain and ask them why the keel plate was painted silver
2) Arrange for a new survey with a local Hanse specialist
3) Go for a sea trial there myself (tricky due to covid)

Does anyone know of a Hanse specialist in Cap d'Agde France / South France area please?

Again, many thanks for your support.
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