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Having recently returned to the class, I was wondering if anyone can tell me how the rules regarding sail area have changed. I have sails dating from 2007 that are a little smaller than those measured in 2009
 
measurements are 1134, 1697,2041 and jib are 2.260m2 on the latter.
 
has the measured area of sail increased in rules since these sails were built?
 
thanks
Matt

not having built one for a N12 this is just as suggestion - but h105 is the section used on foiling moths so should give good lift. However you might find it difficult to shape due to the concave curve. Naca sections are altogethor easier to shape and give adequate lift I would  suggest under small angles of attack.
To save yourself some trouble you could use a couple of windsurfer skegs - easily obtained second hand as they get knocked about. They have the advantage of being the right size and section but are a little heavily built. I have a couple in my garage that I intend to use in this manner at some point.
www.uk-cherub.org has a how-to on building t-foil rudders.
Mutt
N3486

oh and to answer your question - yes it is stiff enough to take the loads unlike the previous aluminium boom I had.

I've got a carbon mast section fitted up as a boom on my cherub - it doesn't share the featherweight characteristics of a proper boom but otherwise serves ok. I wouldn't like to have it whacking me round the head during ill judged gybes though.
Matt 
N3486

I guess if you've got a lifting rudder you could build a stock that it drops verically into- actually building a stock that has parrallel sides rather than a naca section is considerably easier. Its as simple as building the right size box out of plywood and wrapping it in carbon or class fiber. That suffices for my cherub and its under a considerable load. reinforce at the pintles and stick on a tube. Easier done than said ...... maybe!
Matt
N3486

not without kneeling in the back of the boat and heaving on it. perhaps I could rig up some devilishly clever lifting mechanism hanging off the boom but as it stands I'll be zig zagging everywhere trying to get the damned thing up.

I've just fitted a daggerboard rudder to apple turnover. Thought that might make a good compromise for grip in high winds and slipperyness in light winds with it 30cm up. Can also sail with it high in shallow water but that would have to be for the whole race which not  might be the best plan.
Matt

probably
N3486 (this time hopefully).

I'll do my best to sail.

Personnally I'd quite like a nationals at swanage. bournemouth bay would make a great sailing area and purbeck peninsula is a lovely place for a weeks holiday. The solent is probably a bit too busy over the summer - I don't really fancy giving water to 1/4 tonners all day.
Matt
N3486

Matt,
I have no problem with this forum being used to discuss the rules, and i apologise if i left that impressoin.  What i was suggesting was that one thread was better than 7 or 8 and some discussion of the merits of any change rather than one liners would make for a more considered debate.  Personally i prefer the old fashioned debate at the bar.....
Antony

 
sorry I wasn't infering that I was annoyed by your response. Its just that I have a different comment to make on each of these rules - so one single posting, listing all the rules I find a littel odd, wouldn't be very easy to respond to. I havn't got a point to make collectively, but I think each rule is worthy of discussion in its own right - and the wiki would do that pretty well.

Well just look at anthony's and Wondering's comments when I made the original postings. This isn't a good forum for discussing the rule set as its best to keep the discussion thread tightly coupled to the rule in question. The Wiki does that very well. 
If you want to bring the wiki into the N12 website then please do but its better than these discussion pages.

All development classes incrementally reduce waterline beam. Look at the moths!!!. Cherubs have too - they are currently around 97cm waterline beam but each new design challenges this.For comparison my 1995 cherub has a waterline beam of about 125 cm. There is an obvious reduction in stability as the waterline beam reduces and I've heard the top cherub sailors talking about 95 cm as unsailable by two person crewed boats.
What I find bizarre is that we have a ruleset that has produced speedbumps. This rule taken alongside the no hollows rule seems to have promoted some rather odd artefacts. If we changed the height of the rise-of-floot measurement to be closer to the actual waterline for modern boats wouldn't we prevent that sort of oddity and maintain a sailable minimum waterline beam?

looks good to me.
well done.
 

I believe that the basis of the rule goes back to 1936, days when the Twelve didn't even have the full length top batten and the rules stated that the sails had to be capable of being folded up and be able to fit in a cake tin.

Do fully battened sails really last longer? I suspect in reality not; seeing how the Salcombe Solo fleet keep buying new sails (or is it new boats to put their old sails on?!!!) I suspect that the competitive life to a fully battened sail is about the same as ours.

 
do any of the sole sailors choose short battened mainsails? or do they all choose fully battened?