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S&S Swan General - Swan 40 - 25mm Diameter screw on bow deck
28 April 2022 - 13:45
#1
Join Date: 09 November 2021
Posts: 30

Swan 40 - 25mm Diameter screw on bow deck

Hi all, Anyone has a photo of the parts to attach on the 25mm thread on the bow deck? I suspect is to fit a pulley fot the spinneker pole. I would like to make this parts.

I have another one but is for a support for the anchor. 

28 April 2022 - 13:50
#2
Join Date: 29 January 2007
Posts: 928

Dear Duarte,

that's an eyebolt, yes, for the spinnaker downhaul.

I will try to get you a photo of this part over the week end.

Fair winds!

matteo (47/069 Vanessa)

30 April 2022 - 23:17
#3
Join Date: 31 July 2007
Posts: 84

There are supposed to be several eyebolts tied together with a string in the compartements under the steps where you keep your spare winch handles. There are also two threaded inserts like that on deck inboard of the stays near the house. I use them with the working jib close hauled sheeted inboard of the stays. The one on the foredeck you show I also use to hoist my stays'l flying (luff 46, leech 41.5, foot 19.2, LP 17.2, 3.2 oz, with reef: luff 32, leech 31.1, foot 12.9 all in inches) and I see on the sailplan that the attachment point on deck is shown just fwd. of the house, but mine is where your's appears to be. I tried the stays'l once in the 31 years I have had the boat, It's nice because it puts the center of effort more aft compared to the working jib. I'll get you some photographs and accurate tread dimensions of the male thead like OD and pitch

Pete Cygnus 040/012  

 

02 May 2022 - 11:05
#4
Join Date: 09 November 2021
Posts: 30

Dear Pete,

 

I really apreciate your message and "teaching"! It is great to dig in this small details od this boats and became, slowly an expert and therefore lover.

Mike St John and Matteo send me a few photos and I am going to do a few eye bolts for differente use.

 

Many thanks a fair winds!

 

Duarte Champalimaud

Star Swan (40/47)

 

 

05 May 2022 - 04:24
#5
Join Date: 03 March 2007
Posts: 237

 Hi Guys,

 

Here is my contruíbution to the fittings question.  Note, I am redoing my non skid..  The under deck fitting is attached to an eye in the bulkhead aft of the anchor locker via a dyneema strop and a turnbuckle.  I wanted extra support for when I waas using the storm jib.

 

Fair Winds

 

Mike

 

Deck fitting

Deck fitting under deck support

deck fitting from above

05 May 2022 - 09:25
#6
Join Date: 09 November 2021
Posts: 30

Thank you Mike and all,

 

I will show here all my eye bolts that I will make.

 

Thank you!

 

Duarte!

 

Star Swan (40/47)

05 May 2022 - 21:35
#7
Join Date: 31 July 2007
Posts: 84

Here are the dimensions of the thread, all in mm:

Outside diameter: 18.7 to 18.9 mm

pitch: 1.68 mm (measured over 5 threads: 8.4 mm)

Length: 18.5 mm (varies a little)

Length of thread relief: about 6 mm

Eye bolts for deck plates

13 May 2022 - 12:46
#8
Join Date: 09 November 2021
Posts: 30

Thank you so much Peter!!!  Apreciate all the careful details you sent!!!  

Duarte

16 May 2022 - 14:07
#9
Join Date: 30 January 2007
Posts: 446

Here are the dimensions of the thread, all in mm:

Outside diameter: 18.7 to 18.9 mm

pitch: 1.68 mm (measured over 5 threads: 8.4 mm)

Length: 18.5 mm (varies a little)

Length of thread relief: about 6 mm

These numbers appear to be very close to an UNF thread, namely: 3/4 16 TPI.

I am sure that Lars would have known.

Daniel, Luna Menguante 411-004

18 May 2022 - 21:44
#10
Join Date: 31 July 2007
Posts: 84

Yes, it maybe 3/4 -16 thread. That would take an american lathe to cut because of the change box. I would buy a bolt with a 3/4 - 16 thread and try it on the boat. If it fits you can go to a machinist and tell him to cut the tread just like it. That way the machinist has more confidence that the thead will fit. I have searched old catalogs from the early '70ties and didn't find these deckplates. Eye bolts are available here but maybe not this size and maybe not in stainless. I tried to measure the thread as accurately as possible using a vernier caliper but it would be better to screw a bolt into the deckplate for fit.

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