I checked my work in the morning!! The real answere is...I=66.7 in4 (2774.3cm4) so Z= 25.7 in3 (421.1cm3) does this sound more resonable?
Pete ---- Original Message ----- From: Pete and Karen Gauthier<mailto:gauthier0421 at msn.com> To: krnet at list.krnet.org<mailto:krnet at list.krnet.org> Sent: Saturday, February 21, 2015 7:10 PM Subject: Subject: KR> center spar analysis Has anyone tried computing the section modulus of the front center spar? I should probably wait until tomorrow to check my work but I get I=36.7 in4 (152.7cm4). Z = I/c so Z= 10.2in3 (41.5cm3). I used dimensions from my CAD drawings and they are before any trimming for the airfoil but I think the difference is insignificant. Are these numbers close to what you got? Do I need to go back and do it over? Pete
