How to make an origami airplane (fighter jet plane) (page 10)

 

17. Unfold the previous valley-fold of the step #16.   Prepare to apply the "outside reverse-fold" .   Please study the above link to learn what outside reverse-fold is.

18. Apply the "outside reverse-fold" of the step #17.   Prepare to apply a horizontal valley-fold.

 

 

 

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