standing rigging tangs

[Poey50]

I have not studied this on the catalogue yet but a quick look indicates that this fitting is just inserted into a wide slot and held in position by just two machine screws. This cannot be right surely, no internal mast backing plate for instance. I must be missing something so I will spend some time today studying the whole catalogue.

I fitted one of the Selden types when the mast was down over winter. See picture top left on page 24.

http://www.seldenmast.com/files/excerpts/595-808-E-24-31.pdf

 

[zoidberg]

I'm fitting a Wichard inner stay mast-tang, for a roller-furling inner headsail, which will be 6% 'I' from the topmast fitting - as recommended by several riggers and Selden. The mast is 32' , so not a Big Boat.

I'm also looking to fit tangs/arrangements for Dyneema runners. I already have the plates, with 'holes 11mm ID. These arrangements are 'not strictly necessary' but I'll need somewhere to hang my lazyjacks lines and, preferring not to drill/affix additonal items to the mast walls, these will do.

The Selden T-Eye toggles are eye-wateringly expensive, so I'm musing about running a 10mm bar across Port to Starboard, threaded each end just enought to take an M10 eye-nut, suitably peened.

That would be a whole lot cheaper....!

What does the engineering team think? Probably adequate...? Or 'stand well clear'?

 

[BabaYaga]

FWIW, here is a photo of my inner forestay arrangement, with the Seldén fitting mentioned earlier:

 

[BurnitBlue]

I'm fitting a Wichard inner stay mast-tang, for a roller-furling inner headsail, which will be 6% 'I' from the topmast fitting - as recommended by several riggers and Selden. The mast is 32' , so not a Big Boat.

I'm also looking to fit tangs/arrangements for Dyneema runners. I already have the plates, with 'holes 11mm ID. These arrangements are 'not strictly necessary' but I'll need somewhere to hang my lazyjacks lines and, preferring not to drill/affix additonal items to the mast walls, these will do.

The Selden T-Eye toggles are eye-wateringly expensive, so I'm musing about running a 10mm bar across Port to Starboard, threaded each end just enought to take an M10 eye-nut, suitably peened.

That would be a whole lot cheaper....!

What does the engineering team think? Probably adequate...? Or 'stand well clear'?

Thanks for the photos. The wichard system looks very strong.

I also considered a bolt through the mast which is the old system and at first appealed to me. Then I realised the bolt would need to be mast crushing tight or movement would cause the bolt hole to elongate in the soft aluminium mast.

 

[vyv_cox]

Thanks for the photos. The wichard system looks very strong.

I also considered a bolt through the mast which is the old system and at first appealed to me. Then I realised the bolt would need to be mast crushing tight or movement would cause the bolt hole to elongate in the soft aluminium mast.

I seem to recall a clever arrangement whereby a tube was inserted across the mast and a long bolt clamped it in place. This overcomes any tendency for mast crushing and would allow eye nuts at each end of a length of studding. Anyone know the detail?

 

[BurnitBlue]

I'm afraid I gave you the part # for the saddle only, correct number for the entire fitting is 517-905-01 (6mm stay) or 517-911-01 (7 or 8mm stay).
The advantage of this type of forestay fitting is that you don't need access to the inside of the mast (top box remaining on), this in contrast to the "nose" type fittings.




It surely isn't.

OK Found it. Are you sure that only four rivet pins are strong enough?

I am intrigued by the triple combi box # 505-018-01 there are no assembly instructions but it appears from the catalogue that a quite wide slot must be cut into the mast then the whole box threaded through the slot to rest against the inside wall of the mast which then uses two machine screws to hold it against the mast. Seems even more flimsy. The Wichard system does appear to be very strong and can be mounted from the outside of the mast. No need for internal mast access. I thought this was going to be an easy decision.
Thanks for the replies.

 

[Tranona]

OK Found it. Are you sure that only four rivet pins are strong enough?

I am intrigued by the triple combi box # 505-018-01 there are no assembly instructions but it appears from the catalogue that a quite wide slot must be cut into the mast then the whole box threaded through the slot to rest against the inside wall of the mast which then uses two machine screws to hold it against the mast. Seems even more flimsy. The Wichard system does appear to be very strong and can be mounted from the outside of the mast. No need for internal mast access. I thought this was going to be an easy decision.
Thanks for the replies.

Accepting that you seem naturally suspicious of things you have not seen before, these fittings from Selden are widely used by just about every European boat builder and have been around for many years. Doubt their engineers have got their sums wrong in designing them. If you follow their recommendations for size and use then fit according to the instructions they will work as intended.

 

[BabaYaga]

OK Found it. Are you sure that only four rivet pins are strong enough?

The force is not taken by the four rivets, as the saddle ”ends” are resting on the inside of the mast wall.

 

[steveallan]

I seem to recall a clever arrangement whereby a tube was inserted across the mast and a long bolt clamped it in place. This overcomes any tendency for mast crushing and would allow eye nuts at each end of a length of studding. Anyone know the detail?

Drill two holes in the mast. Hole one outside diameter of the bolt . Hole two outside diameter of the tube.
Insert tube and clamp with the bolt.

 

[BurnitBlue]

Drill two holes in the mast. Hole one outside diameter of the bolt . Hole two outside diameter of the tube.
Insert tube and clamp with the bolt.

??? Joke perhaps?