On 7/14/2011 10:15 AM, David Love wrote: > You haven't > adequately answered the question, at least not to me and I am open to it. Then the failure is mine. Since I'm obviously not able to get across to you one extremely simple mechanical concept on the fundamental difference between the function of ribs in CC and RC&S boards, I'll quit wasting your precious time trying and you can find for yourself a more capable teacher who can. My apologies for your wasted efforts so far. Ron N
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