And, as I remember, Tom commented that it took some 900 computer runs using manual iteration to develop the Force 12 basic design... Denny -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm