Brief Description: Drilled (L) flap hinge to wing and brace
To rig the flaps on the quick build you need to find a way to get the flap brace into position. The flap brace gets riveted to the rear spar but there is a step that causes the brace to move away from the wing skin. In order to rig the flaps properly the brace needs to be held in place. I used a technique I read about, which is to drill a few extra holes between the skin and brace to set keeper rivets. These get set with the flush side on the inside of the flap brace, this way the rivet holds things in place but are flat so it does not effect the spacing of the flap hinge to the flap brace. I choose to use some stainless steel blind rivets I already have on hand, they are -3 size so after the keepers come out I can set normal -3 flush rivets to fill the hole. Here is how I drilled the flap hinge: I first drilled all of the holes to #42 then I removed the keeper rivets and then ran a #40 ream through all of the holes. After this I deburred all the holes and made the counter sink in the skin for the keeper rivet holes. Since the brace is already in place the keeper rivet holes need a machine countersink in the skin instead of a dimple, you can’t counter sink the brace to accept a dimpled skin for these holes due to the skin brace spacing. Hopefully the picture below lets you see what I mean.
Keeper rivet set inside out
inside view of keeper rivet
Keeper hole gets machine countersink once the rivet comes out
