At 01:32 pm 24/06/2006 -0400, you wrote: >http://www.alternate-energy.net/R/news.php?detail=n1151100689.news > >http://tinyurl.com/grvcr >
Tension (negative strain energy) in the swing suspension is fine. But one must not forget the compression (positive strain energy) in the columns wot stops the crossbar from coming crashing down and whamming the swingers on their nuts. <g>
