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Keel Bolts and General Topics on Keel - Swan 47 Aft Keel Bolts
11 January 2018 - 14:21
#22
Join Date: 05 December 2012
Posts: 4

Dear Lars,

Can you please tell me what socket size to use, I checked internet and I conclude it is 36 and 46 for the M24 and M30 bolts/nuts?

Thanks for your help

Regards Robert

12 January 2018 - 15:46
#23
Join Date: 02 January 2008
Posts: 1438

Robert

Your socket sizes are correct.
Kind regards
Lars

08 February 2018 - 19:23
#24
Join Date: 17 November 2016
Posts: 26

Some progress:

See attached pictures of my 2 aft keelbolts (note that there was originally only 1 here, a new one was added previously). As recommended, I've removed the laminate approx 8mm to allow a new large plate 14mm thick.

See also proposed plate template. The plate will be chamfered to match the shape of the hull. 

I plan to imbed the plate into wet laminate and tighten the bolts once hardened. Please confirm this is a good procedure.

I've attached a closeup of the original M30 aft bolt. I am concerned that the bolt is embedded in resin or epoxy because there does not appear to be any space for caulking around the bolt. Should I worry or will the bolt move through the hull once torqued? I had to remove all the resin to extract the original square washer so I think this was an original installation.

I have additional concerns I will post shortly in a separate reply.

Thank you,

Toronto Till

1981 Swan 47/57 - "Till"

08 February 2018 - 19:28
#25
Join Date: 17 November 2016
Posts: 26

This post is concerning the lifting lug. I will not be re-installing it. Instead I am making a stainless steel copy of the base to install. I sandblasted the lifting lug and the welds appear quite corroded - see attached pictures for reference.

Toronto Till

1981 Swan 47/57 - "Till"

09 February 2018 - 15:54
#26
Join Date: 02 January 2008
Posts: 1438

Toronto Till

Thank you for the photos.
ISO-standard 12215-9 for keel attachments recommends 160 mm round washer diameter for M30 bolts, and 127 mm for M24.  Suggest you check if these diameters can be accomodated with your new chamfered backing plate.
 
Bedding down the plate into wet laminate and tightening the bolts after curing is OK.
 
Referring to the lack of caulking around the bolt - if there is a visible crack in this area between keel and hull when the boat is hanging with the keel off the ground, the recommendation is to make a slot around the bolt right down to the lead, and fill it with caulk.
 
The lifting lug bottom plate replacement should preferably be made slightly wider, with chamfered edges, but there is not much space sideways.
 
Kind regards
Lars

17 March 2018 - 20:22
#27
Join Date: 01 March 2007
Posts: 140

If any of you wondered what the Keel Step on a '47 looks like when it is out of the boat, here it is.

It is upside down. It has been modified to include extended wings on the forward face which is bolted to the bulkhead. Just back from being repaired and hot dip galvanised, it is ready to be bolted back into position.

Rob

Sarabande

47/029

Mast step

17 March 2018 - 23:51
#28
Join Date: 17 November 2016
Posts: 26

Rob, thanks for the picture. I would love to see a picture of the bilge before you re-install the mast step. I will try to restore the mast step next winter. I am waiting on my new plates to be ready and I will be sure to follow-up with progress pictures. Only 6 weeks until launch.

Douglas - Toronto Till 1981 Swan 47/57 - Till

18 March 2018 - 15:30
#29
Join Date: 01 March 2007
Posts: 140

Robert, this picture shows the forward bilge taken midway through structural repairs, but you can see 3 forward bolts ( First single leading bolt, then first pair) which the Keel Step gets bolted down to. If you refer to the earlier picture I put up on this post, you can see the corresponding bolts on the forward end of the keel when it was removed, which match the holes on the upside down keel step picture.

Rob

Sarabande  47/029

 

18 March 2018 - 15:31
#30
Join Date: 01 March 2007
Posts: 140

This time with picture!

13 April 2018 - 02:11
#31
Join Date: 17 November 2016
Posts: 26

Time for an update on my progress. The new stainless plate for the bilge sump finally fits after 3 attempts. I welded large nuts (with drainage) on the plate to aid in future removal if necessary. The short bolts are only temporary for installation. The weather is improving for epoxy work and I hope to be complete next week.

Douglas - Toronto Till 1981 Swan 47/57 - "Till"

27 April 2018 - 01:20
#32
Join Date: 17 November 2016
Posts: 26

Work Complete! Thanks for all the advice and encouragement. I will re-paint the bilge next winter.

30 April 2018 - 06:43
#33
Join Date: 01 March 2007
Posts: 140

Nice job Douglas, that will be much easier to keep clean!

Rob

Sarabande 47/029

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