22-09: Riveting Aileron Trailing Edges

The riveting of the aileron trailing edges was done in the same manner as the flaps.

First, the trailing edges were cleaned and etched. They were dried in the sun then given a clean with some acetone. I then applied the VHB tape to both sides and let it sit for a day. 

I started on the right hand aileron - the trailing edge was clecod into position using the square tube (from the flaps) on the top side of the skin. I then checked to see if the aileron was true, by placing it on the known flat table, and checking for any twist. You can see from the winding sticks there is a very very slight twist in the aileron. Approx. 3/32nd of a twist.  

So before removing the tape and bonding the trailing edge in place, i decided to weight the aileron to the known flat table, and try and get some of the twist out. I used whatever i could find that was heavy. 

I then removed the tape on the trailing edge, and let it setup overnight. I then checked the twist once again and it seemed a bit better. With the aileron still weighted down, i set the rivets for the counterbalance to the skin. 

I was then able to remove the weights and gently stand the aileron up. I used the same method for riveting the trailing edges as the flap - I used the pneumatic squeezer, and first partially set the rivets with a modified parallel set, then with modified set which matched the angle of the trailing edge. 

Nice and straight

This shows a partially set and finally set rivet. Along with how the sets align with the top and bottom surfaces for each step. 

A partially set rivet is on each side - the one in the middle is fully set.

On the top is a normal flat die. On the bottom a normal flat die, but one which has been ground down on one side to clear the skin a bit more, and allow more of a set of the rivet. 

On the top is the same flat die. On the bottom, a modified die which has been ground to the same angle of the skins. This final sets the rivet into the dimple. 

After riveting, i placed the finished aileron on the bench and checked for twist again. The weighting really helped - the twist was 1/16th  - i think that is acceptable. Of note, the left flap was perfect - no twist at all before or after riveting. 

Of course, i had to skip ahead and install the ailerons on the wings. 

Nice and straight and aligned with the flaps in reflex (full up) position.

The left aileron - also very straight.

It really aligns with the flaps well. So impressed with this kit.

This means - Chapter 22 is done! But not without a bit of waggling...