What is the proper layup schedule and geometry for NG30?
In newsletter number 86, Nat Puffer suggests a modification to the geometry and layup schedule for NG30 in order to help prevent breaking these pieces during a hard landing. This design change may be easy to miss since it is located on the last page of the newsletter. The modifications consist of both increasing the height of the low spot on NG30 by 2 inches and augmenting the original layup schedule with two additional plies of UNI (the verbiage says BID, but the drawing clearly shows UNI, and the words in the image say “two ply UNI”) two inches wide on each side of each NG30. Radii of 1 inch should be applied as indicated in the newsletter to reduce stress concentrations.
