Hi Folks,

I've uploaded another few pages of calculations (Page-20 to Page-23 in the 'Phil Lardner' files directory) covering the rib layout and stress analysis. I've used the root rib as a worked example and will upload the numbers for the other ribs when I get them finished.

I discovered a few more numerical typos in Jim Marske's text - confirmed by him. The text could also be a little clearer when describing how the rib panel centroids are arrived at. I mistakenly used the formula on pg D-1 of Marske's manual to calculate both centroids and got answers different to the examples in the text. It took me a while to discover my error - the centroids are being measured left and right from the spar location and not just from the left as on pg. D-1 - hence my drawing on Page-21 showing the graphical method of finding the centroids!

Comments welcome...

Phil.