Projection 762 Help please?

last years irc ratings for p762's

Hi Olly

In a way code 0`s are getting slightly hammered under IRC. This is due to Mr W-O believing A spinnaker made from sail cloth (eg carbon/Kevalr etc) is more of a genoa. However sailmaker in bigboat stuff seem to be developing towards flat A-sails made of conventional cloth, (A1, A2, A3 etc). IRC seems not to have caught onto this one too much as being made of Spinnaker cloth it is deemed a spinnaker, but being super flat it can be carried very close to the wind. Hence lots of the IRC zero + super zero fleet moving towards fixed stubby bowsprits.

We have a Corby 29 down this way that is thinking of trying this so will see how it works out on a boat this size if ready for this season.......

Chic

Im sure you dont need advice on sail design etc being a Hyde agent in scotland, But from a point of view from the kite size and it effect on an IRC rating we have found 45m2 to be a minimum size and 50m2 to be a max size for projection kites. Any more than 50m2 the rating goes through the roof and is more often than not completely unmanagable when windy.

With regard to Headsail overlap area yes the smaller the overlap on the headsail the more the rating will drop. Obviously if you go too far the boat will stop in light airs as being a comparatively heavy hull we have found you need full area to keep her driving in the light stuff. We found 140 - 145% overlap to be the optimum between rating benefit + performance trade off. 

I'm looking for advice from you IRC and SBR experts. I've been ordering some new sails.. Main and number 3 so far. Considering a 47m2 kite - we're still using the original spinnaker hoist position so I reckon that this is about the maximum useable kite size for this... What do you think? 

I've also asked for a price for a 135% genoa for our SBR application (that's the plan for the Scottish Series rather than IRC). Is this a sensible move or will it be too small for lighter breeze? We already have a 150% genoa... Let me know before I empty my bank account...

No.  Not at all, old keel with some additional bolts.  I have drilled down through lead and added 3 x 24mm stainless stud, also core drilled right through keel and added 50mm piece of prop shaft which the stainless stud is threaded right the way through, then epoxied.  Bit like a beefed up Ikea kit.  The reason apparantly is common in earlier boats. They had the stainless top plate welded to the keel bolts.  When you tightened the bolts you simply pulled the plate tighter to the hull, you could not increase upward tension on lead.  The nature of soft and malleable lead means the stainless armature  will need more tension with age.  I noticed a sight movement upon "wobbling" in slings

Bright side is apparantly all boats have had mod but mine!  Now its had it with extra beef.  Wouldnt increase mass as lead is denser than stainless.

 All other boats had mods out of first dozen with this type of keel.  It seems all but mine were modified.

  The boat was weighed with cushions and battery ( a very small dry cell thing, also with 25kg 2 stroke outboard, with minimum fuel).  Also been out the water for a while.  

Apparantly its 1 point per 50kg.  That could give us 3 points  0.965.  Still waiting for sail measurements......