23/03/2013 - Wing Incidence, sweep and drilling !

I made sure I read and reread the process of setting sweep and incidence.

However I already know the left wing required removing, some filing of the rear spar and then putting back into place.

The left wing is slightly tighter fit than the right and takes some pushing and heaving to get the wing out and back in again.

Once that was done I measured from the tail to a rivet in the end of the wing to measure the triangulation.  173" on both sides ... I kid you not !

Dangling the plumb bobs from the wing edges also showed that there was zero sweep.

Next up is setting the incidence using a spirit level and a 3" block of wood.  I had to lift the wing slightly in the rear spar (you can see in the photographs below)  but the hole distance is still ok.  In fact I have a just smidge more than required, which is why I left the wings with a 0.1 degree positive incidence.  If I had gone level my drilling would need to be perfect, and even with a drilling jig made out of aluminium to keep the drill straight I decided to air on the side of safety.

It is imperative that both wings are set to the same incidence however.  I think I got mine close enough for government work !

You next check that the flaps will close against the bottom of the skin when in trail with the wing.  I have a slight gap which is not surprising given the wing is slightly low.  I will close this by tweaking (it wont need much) the skin to close it up.

Right wing drilled first #40 and a long reach cleco installed

The same for the left

The instructions say to get a beer, well they do at the bottom of the page so I skipped the rest for today and drove home for a couple of beers !