Can anyone explain this to me with the modified wing ribs? Are some modified while some stay per plan? For example, as for the modified ones, I got 1,2,3,4,5,7,8,17,18,19,and 20. I know that some of the missing numbers are tip ribs, like W10, I guess my only concern is W6. That's the only one I don't have on the modified temps.
Steve look at W5 rib and you will see where to cut the tail end off to get your W6