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I do not want to build a surf/resort beach cat. I want to build a sexy looking (contemporty design), reasonably well performing 12 foot cat. ... it is really more about what the boat represents. Do kids want to jump on a boat that has skegs, or do they want to jump on a boat ... that is similar in concept and style to their parents A, F18, F16, etc.



Indeed, the is the exact same worry I have as well. Skegs can be made to work well technically, no real issues there, but aestetically or from a marketing point of view they have the close association to "training wheels".

Thanks for your answer.



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I have one other question for you. On this forum there has been a bit of talk about possibly fitting a jib to some of the designs to promote two up kids sailing. I assume the inherent flex in an unstayed mast would mean that it would be difficult to maintain jib luff tension, making a jib pointless in this situation. Is this how you see it?



Well, as long as there is leech tension, there will also be forestay tension. An unstayed mast will be less "stable" with respect to this but it probably can be made to work well enough on a boat of this size (sails of this size).

However, despite the fact that I'm a believer in the sloop rig for boats like the Nacra 500, F16's and F18's I'm not a supporter of sloop rigs on the F12's. I think these have unacceptable disadvantages for the F12's such as :

-1- They load up the bows requiring heavier construction
-2- Require bridles that need local reinforcements in the bow
-3- Require at least a forestay and a hound fitting on the mast.
-4- Dumping the mainsheet on the unstayed rig will see the forestay go slack and have the jib pump (possibly violantly)
-5- Add significantly more cost to the boat then sail area.
-6- Jibs flap about in strong winds making them harder to rig and scaring novice sailors.
-7- A spinnaker will do more for overall performance and similar costs

So I think rigging a jib on an unstayed mast can be made to work reasonably (although not really well) I think this so-so characteristic combined with the above points make F12 jibs unattractive. It is also just not the natural thing to do with an unstayed rig either. Additionally, adding a jib typically increases heeling and pitching force by some 15% while adding 25% is overal area and drive (roughly speaking). For the F12's I think adding 15% area to the mainsail is a better choice especially when the craft is also fitted with an asymmetric spi. It will feel as the same craft in the way of pitching and heeling and only lack 10% drive upwind while more then just compensating for that loss by increased downwind performance.

I also think the the spi to be more in line with the F16's and F18, and I think it will be more enjoyed by the owners c.q. their kids. More in line with the hot dinghies like the 29er as well. I do believe that far more 2-up 12 year old crews will sail the F12 then 1-up 12 year olds. I envision the crew working the mainsail upwind and the spinnaker on the downwind with the skipper steering and trimming. I see no particular advantage in adding a jib to that mix. And IF a trapeze is added for these 2-up crews then adding more heeling moment (as required then) is best done by adding mainsail area / mast length.

I trust this answers your question.

Wouter

Last edited by Wouter; 05/29/09 05:29 AM.

Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands