chris weston - Thanks, and I agree this thread was food for thought. No acknowledgments are necessary, nor will they be likely forthcoming. That is as it should be. Honestly, I think some of the boffins at AAIB might resent some of the comment here, I probably would. I did not mean to imply any suggestion of conspiracy or anything sinister, just trying to foment a comment; thanks again. Also, I would definitely include your comments on thread on my list of very constructive contributions.