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Bow sprit DIY help please!


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Can anyone help with a basic carbon engineering question.

 

I've got an Elliott 10.5.

 

Current set up is A frame alloy sprit which holds the forestay out 55cm with a bobstay to the knuckle (see pics)

 

I then have a carbon selden sprit to run the FR0 and Gennakers off going out another 120cm.

 

I got given a (Thanks BooBoo - bloody legend) a section of 120 OD x 5mm wall carbon tube (probably around 120cm of usable length.)

 

So my questions are:

 

1. will the tube support the forestay/bobstay in compression?

 

2. If how would you reinforce inside the boat, is this a over engineer it and DIY job? I'm comfortable working with glass and composites but not vacuum bagging etc?

 

3. I'm thinking with the reverse sheer the tube will need to be merge into the deck.

 

The selden sprit can then slide up the middle of the bigger tube to run the big sails.

 

What are your thoughts? 

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Is there a reason why you cant change it back to standard like the other 10.5’s?

 

Chain plate on the stem and then a nice tidy prod?

That is an option, but I think the set-up is to balance the rig out and carry more sail area as the chain plates were moved to the gunwales, preventing the use of  overlappers.

 

She can be a handful reaching sometimes so suspect that was to reduce the rounding up that can happen.

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That is an option, but I think the set-up is to balance the rig out and carry more sail area as the chain plates were moved to the gunwales, preventing the use of overlappers.

 

She can be a handful reaching sometimes so suspect that was to reduce the rounding up that can happen.

I believe the other 10.5’s have had keels moved aft which would assist with that?

 

Do you struggle getting forstay tension with that setup?

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Keel job is probably a future task (big$$$) and I sail in shallow harbour so the T-keels are probably a bit to deep.

 

Forestay tension is no biggie the rigging is 7mm Dieform and the bobstay is 8mm, both are strapped done hard. the forestay is fixed quite high on the mast so the backstay off the boomkin really tightens it up.

 

The rig itself is a bit of a beast. with the A-frame the weakest link by far.

 

The thinking is to laminate the carbon tube section super strong so it effectively extends the bow out 550mm then have a retractable sprit section in side it.

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