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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

4.3.3 At midlength, measured at 229 mmm above the lowest point on the outer surface of the skin .... [beam] shall not be less than 1168mm
why do we have a rule specifying the beam at that arbitary point?

11.6.1 The jib may be boomed out by a jibstick attached to the mast.
Why do we need that rule - is there a rule that otherwise prevents jibsticks?

9.2 Only one set of cross trees or spreaders is permitted.
why?

11.3.5 Battens: Sails shall have not more than three battens of maximum width 55mm and of maximum length 765mm, except that the top batten may be of any lenght provided that it does not project more than 100mm outside the sail. The centreline of any batten shall fall within 55mm of a leech measurement point as defined in Rule 11.3.6
why?
and if you want a why not - I'd personally prefer a more robust sail and I could acheive that with battens.

9.5 Prohibitions: Jumper struts, permanently bent masts and booms, rotating masts and OTHER SIMILAR CONTRIVANCES
isn't that a bit catch-all? Can it be measured?

7.1 when fully lowered the centreboard shall not protrude more that 1070mm
why?

5.1 Decks
Boats may be open or decked.
what exactly does that infer?

4.2.1 The sheerline shall be a fair continuous concave curve when view form side elevation.
Why?

any advice on how to best seal the centreboard bolt below the waterline would be appreciated.
Matt
N3486

The measurement guide state "The overall length includes the stem band (if fitted) but excludes normal rudder fittings within 60mm of the centreline"
What constitutes "normal" in these circumstances?
I am planning a rocking plate system to change the angle the rudder makes with the waterline between -2 and +7 degrees. I do not expect the plate to extend more than a couple of inches beyond the transom and the whole mechanism will be contained within 60mm of the centreline. However the rudder fittings will not be off-the-shelf pintle or gudgeons.
Please could someone from the technical committee respond as to whether the system is likely to pass measurement?
Cheers
Matt
N3486

does anyone have a feel for what's the right rudder length and chord for sea sailing. my Annies Apple rudder is too small - I know that much!.
Matt
N3486

swinging spreaders:
Is there a full-proof way to set up swinging spreaders? I tried it on 3486 a couple of years ago but found that when the shrouds were on tight the spreader would swing forward an inch or so rather than lock back and push the mast forward.
As I understand it the spreader when locked on is supposed to push the mast forward and outwards (ie. away from the locked shroud) so it seems to me that the pressure held in the mast is released by unlocking the speader and dropping back to its neutral bend. (clear? - probably not). Thats what seems to be happening on 3486.
I've designed a nifty mechanical thing to swing the speader forward against the pull of a bit of elastic (which helps it swing back into lock) but I bet its not needed if the spreaders are set up properly. So any help you can give will save me ages in fiddling.
Cheers
Matt
 
 
 

Hi,
Does anyone have an old boom that I could use to re-equip my cherub. nothing sophisticated required.
call me on 07977006585 if you have anything. I'm located in southampton so I'd prefer something local.
Cheers
Matt
N3486

oh no - marineware has discontinued their small (< 3 ltr) epoxy resin products. Does anyone (dare?) know where to buy epoxy at reasonable prices (i.e not through a chandlery)

Ta
Matt
N3486