> Someone on the list can probably determine the date when C&C started using > balsa core, but I'd guess it was on new designs that went into production > around 74 or 75.
IIRC C&C designed balsa cored boats as early as 1968. Calypso was designed in 1969/70 and built in 1970. The deck is typical of a 70's era balsa cored structure with a thicker skin on top and thinner skin inside and solid glass under winches and some other high stress deck hardware. There was a ring of plywood around the mast collar. The hull has a very thick outer skin with a layer of balsa added inside with a thinner cover. The hull is solid (no core) in the areas where bulkheads are attached, within 4" of the hull to deck joint, and approx. 2 feet either side of the bottom center line. The glass lay-up near the center line is in excess of 1" thick. I have found no water ingress in the balsa added to the inside of the hull. All of the balsa core failure (mostly rot, very little delam) occurred around hardware or ports/hatches that had been installed without sealing the exposed balsa. Steve mentioned a 43 owner that spent $10K on core repair. I expect it had similar issues of water leaks near mounting holes. As we (the co-owners of Calypso) are in the middle of a DIY deck restoration that started last December I would have gladly written a $10K check for someone else to do this job. My SWAG is, at Seattle boat yard prices, Calypso's deck repairs and upgrades would cost $50K, maybe more. As someone already posted, keep up on the deck hardware maintenance, seal the balsa when doing that maintenance and enjoy the benefit of a lighter, stiffer deck/hull. Martin Calypso 1971 C&C 43 Seattle -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rick Brass via CnC-List Sent: Wednesday, August 20, 2014 7:42 AM To: Paul Baker; cnc-list@cnc-list.com Subject: Re: Stus-List Upsizing boats I'm not sure how many of our "classic" C&C hulls did not have cored hulls. Someone on the list can probably determine the date when C&C started using balsa core, but I'd guess it was on new designs that went into production around 74 or 75. My 38 is balsa core. The 33 is cored. The 37 if I'm not mistaken. And all the boats from the 80's. My 25 - a design from 71 or 72 - has a balsa cored deck and a solid hull. But it is a small boat and any given thickness of glass is going to result in more stiffness than the same layup schedule would give to a 35 foot boat. The 35-1&2 and 30-1 are also older designs and probably not cored. Data from US SAILING PHRF BOOK and sailboatdata.com show the following: 30-1 8000 lbs. 43% ballast. Range of PHRF ratings 168-186. Lake Ontario PHRF 174 30-2. 8275 lbs. 38% ballast? range of PHRF ratings 144-165. Lake Ontario PHRF 147 35-2. 13850 lbs. (35-1 had 5500 lbs ballast, which would be about 40%) range of PHRF 120-142. Lake Ontario PHRF 132 35-3. 10800 lbs. 42% ballast range of PHRF 114-129. Lake Ontario PHRF 123 It is not impossible to build a non-cored hull that sails well. George & George certainly did it. But even newer cored designs from C&C do seem to tend to be faster. Recall the discussion about the non-cored Shannon 38 from last week. IIRC the conclusion was heavy and slow. Rick Brass Sent from my iPad > On Aug 20, 2014, at 1:12, Paul Baker via CnC-List <cnc-list@cnc-list.com> > wrote: > > So which one do all the "classic" C&Cs fall into with their solid hulls? ;-) > > Paul. > Orange Crush > 27MkII, Sidney, BC > _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
