Monday, August 5, 2019

Wing spar match drilling to wing J stiffeners

So for some weird reason Van's has you use the wing spar to match drill the holes for the wing skin J stiffeners.  I imagine they have you do this because it is hard to do it the old fashioned way by aligning a center line in the wing skin holes.  I guess it is too far to expect someone to be able to reach or something.  Anyway some people have made a mistake here and mis-drill these.  Thankfully I read about that elsewhere before and this was not a problem for me.  Thanks to all the people that came before me!

They have you clamp the stiffeners to the wing spar flange.


The stiffener should stick up above the spar flange by 1/16".


Then match drill it to the spar flange holes.  I used a cleco in every other hole.


Yep, that is a bunch of holes!


For the bottom side, they have you skip the area that gets inspection plate nutplates.  Those don't exist on the wing skin where the J stiffeners go so you don't want those holes match drilled here in the wrong place.


Both sides done.  Something like 164 holes per spar!

2 comments:

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