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Agreed Colin..
Worst years were during the 70's - 80's,- 10 yr old boats built in late 60's / early 70's... ....Also in some boats built with the fire retardant resin called "Heteron" (sp?) during late 70's..... Agreed...much has been learned about building composites since then.... Also agreed, apples /oranges here ... however, a crack in a fiberglass cowl a few yrs ago caused water from melting snow to penetrate the laminate on an aircraft here. (Stored outside) The freeze/thaw cycle caused a delamination about the size of an adult hand. It started around a fastener mount..This was easily spotted through the transparent inner laminations when viewed from the inside..(once the cowl was removed) and easily repaired... Cheers! Dave On Thu, 24 Mar 2005 16:28:04 GMT, "Colin W Kingsbury" wrote: "Paul Tomblin" wrote in message ... In a previous article, Dave said: Ans , yes, I have seen many examples of this "delamination" of composiets... It would be easier to understand or give credence to your points if you knew how to spell or punctuate. ....many cause factors, osmosis being the most common, poor quality control/contamination during layup are others.... Osmosis happens to things immersed in salt water, which hopefully isn't the case with aircraft rudders. And the "poor quality control/contamination during layup" are why I specified that these things would be caught in the initial inspection. Aircraft parts are subject to a lot more quality control and tougher inspections that your boats. Usenet grammar pedants should beware of preposition-object agreement in their glass houses Anyway, I suspect you are seeing cosmetic flaws in the gelcoat, not full on structural failures. In many older boats, osmotic blistering is going beneath the gelcoat, sometimes several layers deep. However, I tend to agree that we are talking apples and oranges here. The worst blistering is found on boats going back into the 60s and 70s, and drops off with each passing year as manufacturers understood layup better. Airbus started using composites in the early 80s, by which time we were starting to get a decent feel for best practices in manufacturing. -cwk. |
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