I made a mistake laying out the drill pattern for the NACA ducts. I measured and marked the fuselage side skins to have an even rivet pattern around the cutouts but I didn't hold the plastic ducts themselves in place to recognize that I didn't need to drill any holes along the vertical aft perimeter line where the inlet is. I ended up drilling 3 extra holes along this line that will now have rivet tails sticking into the inlet stream. I filled these holes with pop rivets, which now that I think about it I could have sqeezed solid rivets in there. I must be tired. I know that the NACA duct shape is important and having these rivets there may cause the air to be turbulent. I may drill these out and just use some type of filler to plug the holes. I didn't really even need to drill the NACA duct to the fuselage, I could have just Prosealed them in place. Oh well, I like the extra security of having the rivets.I used a wood backing block to drill the holes in the side skins. I then clamped the NACA duct to the fuselage and used the holes as a guide to drill the plastic ducts.
Exterior view of left NACA duct drilled to fuselage
Interior view of left NACA duct drilled to fuselage
