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Sail & Rigging - Bowsprit for Code 0 |
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Join Date: 23 October 2011
Posts: 154 |
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Dear Rob, |
Join Date: 29 January 2007
Posts: 1022 |
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Dear Matteo,
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Join Date: 23 October 2011
Posts: 154 |
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Dear President,
thank you for the picture, it might be good to know with more detail about the fixing of the bowsprit to the stemhead plate. |
Join Date: 29 January 2007
Posts: 1022 |
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Dear Matteo,
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Join Date: 23 October 2011
Posts: 154 |
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Dear Matteo, |
Join Date: 16 February 2007
Posts: 199 |
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Dear Matteo,
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Join Date: 29 January 2007
Posts: 1022 |
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Mon Cher Philippe,
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Join Date: 16 February 2007
Posts: 199 |
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Many thanks cher Matteo
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Join Date: 01 April 2007
Posts: 106 |
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Dear All, I intend to make a (more or less) similar construction as Lolita on my 38. I remember an older thread of a stemfitting that was not strong enough for a similar arrangement. Do you think the stemfitting on a 38 is strong enough for a carbon bowsprit for a code zero ? I think a code zero needs considerable more tension on the luff, so the load will be much more compared to a gennaker. Best regards, Jan (38/110) |
Join Date: 02 January 2008
Posts: 1547 |
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Dear Jan It is suggested the bowsprit is attached to the stemhead plate on the forward side of the bow, and not to the deck plate. The sprit aft end may also require local reinforcement of the deck depending on its length and position.
The halyard load in a Code 0 is about twice that of a gennaker, and your halyard winches and blocks can not take that. If you have the original Lewmar 43 winches their safe working load is about 900 kg.
Suggest you ask the sailmaker what halyard loads he expects for the Code 0.
The recommendation is to set up a 2 to 1 halyard for this, you need a halyard with 50% more length, an attachment point near the masthead for it, and a block with sufficient strength for attachment to the top of the Code 0.
Kind regards
Lars
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Join Date: 01 April 2007
Posts: 106 |
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Dear Professor, Thank you very much for your advice. Do you mean that even with a 2:1 halyard the spinnaker halyard block and the block-outhaul on the masttop is not strong enough ? best regards, jan |
Join Date: 02 January 2008
Posts: 1547 |
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Dear Jan Spinnaker halyard loads are assumed to be smaller, you can see this in the sizing of the halyard winches, Lewmar 40 for spinnaker versus Lewmar 43 for genoa.
Kind regards
Lars
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Join Date: 01 April 2007
Posts: 106 |
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Dear Lars and other owners, Yes I understand (I hope). But I thought that is the reason why you advise a 2:1 halyard. And with a 2:1 halyard, the load that was twice the load of a gennaker, should be half and equal to the load of the gennaker. Or do I misunderstand that part ? And the fixed part of the spinnaker halyard must be connected to the mast. And most easy would be to use the spi-block outhaul for that. But then the outhaul must be strong enough for the total load of the 2:1 halyard. Or do you have an other solution for mounting the fixed part ? If the spi-block and halyard winch cannot be used for the code zero, what would be the other options ? How did the other swan owners solve this issue ? Best regards, Jan |
Join Date: 02 January 2008
Posts: 1547 |
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Dear Jan The early Code 0's required very high halyard loads, but you may also have a light weather reaching version in mind. These have appeared later, and need less halyard tension, about the same as your largest genoa, meaning you could possibly use your genoa halyard as is, but the spinnaker gear would need 2:1. Suggest you find out the actual loads.
There is usually a problem with Code 0's and masthead rigs - the halyard and forestay are too close together, and do not allow the head of the Code 0 to rotate freely. It is advisable to discuss this with the sailmaker.
Kind regards
Lars
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Join Date: 02 January 2008
Posts: 1547 |
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Dear Jan
Some mast builders have solved the halyard-stay-too-close-problem by adding a longer crane for the Code 0 halyard.
Kind regards
Lars
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