Our 1971 C&C 43 has balsa added to the inside of the hull between bulkheads but is not cored in the same fashion as the deck.
It appears Bruckmann's build team laid up the hull to full thickness then bonded in sections of balsa and covered those with a heavy layer of glass. (For stiffening, insulation?) The added balsa ends about 18" back from the hull center line. It is my opinion that this 43 would be strong enough to sail without the balsa. (More flexible but strong.) There is no balsa under the bulkheads but there is some under the "stick built" interior elements. We are in the middle of a deck repair and restoration project and have looked closely for any water vs. balsa issues throughout the boat. Most of the deteriorated balsa has been directly under deck hardware and fasteners. The best news is Bruckmann's team used good balsa core construction techniques that have mostly limited water migration beyond the immediate leak area. The biggest risk is in vertical areas of the deck/cabin where gravity relentlessly pulls the water down through the core. Last year I repaired an area below/around a plastic portlight that must have been leaking into the core for 30 years. Took some time and was messy but it will never happen again and that part of the boat will outlast me. Martin Calypso 1971 C&C 43 Seattle [cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:[email protected]] On Behalf Of Jimmy Kelly Sent: Tuesday, April 08, 2014 4:11 PM To: [email protected] Subject: Stus-List c&c cored hulls most c&c cored hulls are no problem unless owners or yards dont instal thru hulls correctly or make impact repairs taking out core & fitting solid glass replacement..no water ingress to core...i would not be concern with cored hull otherwise........
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