ZNLine Factory Enigma Build by Mark Novack

OK, our wing bolt seats are cut to size. The bottom of the bolt seats are cut perpendicular to the hole length, not even with the wing surface. Although this may sound obvious to some, it differs from the normal kit method in which the bolt head fits flush and even with the bottom surface of the wing. In this case, the four bolts holding the wing on are all parallel (or perpendicular to the same plane). Look back to where we drilled the holes into the wing with our router on the flat plate for a clearer picture. On the top surface of the wing, the bolt seats will be cut down 1mm from the wing surface, the angle is not important. Here are the bolt seats. We used a router and an assortment of blocks to level it out and then ran it over the tubes. A very adequate job can be done with a dremel grinder, as this will eventually be capped with a carbon/ply washer with an epoxy/micro balloon mix filling any gap between the washer and the wing.

These seats are on a parallel plane to the front seats.

We use MP Jet blind nuts, 6mm.

Now the blocks go into the fuselage. The side of the block that fits against the wing saddle lip is beveled to fit nicely into the radius under the saddle. The blocks that support the plates are cut to keep the plates in a parallel plane with the centerline of the wing chord.
Here is the rear plate.

I was about to post a picture of the front mounting plate blocked into position. Here is the front.

Here is the big picture.

Again, notice the angle at which it sits. This IS important, especially on the rear plate if you want the bolts to start into the blind nuts.

OK, now we mix our glue and mount the wing. The plate are nicely fit with about 1-2 mm of side play which will allow us to adjust the wing for a perfect alignment. We will start out by tacking the plates in with 30 minute epoxy, and then go back after that is completely dry (about 2 hours) and finish with a nice fillet of 24 hour epoxy and micro balloon mix. The rear plate has been carefully measured into place so that the bolts will go right into their blind nuts. The front plate (this is why the wing goes on before the firewall) is fit approximately because we can reach our hand through the motor opening and adjust it by hand to fit the bolts. We hold it in approximate place, however, as this prevents us from getting glue all over the fuselage interior. Wing is placed on the fuselage, bolts are run into the mounting plate, and we measure, measure, measure, do it several times until all sides are perfectly equalized, then we tighten the bolts and this locks the wing securely into position until the glue is dry. We will not disturb the airplane for at least two hours, although we will return to remeasure everything in about 15 minutes, or before the glue tacks up. Here are the measurements we make. I have only shown us measuring one side, but of course, each side is measured and equalized.

Next measurement.

And the last measurement.

These wings are computer cut and end cut in jigs. They are exactly the same geometry left to right, and if the fuselage to tip measurements are the same, then the triangulation measurements from tip to tail should automatically be correct too (given that the fuselage is perfect out of the mold). The accuracy of these wing is shown at one more location. The center joint of the wings lines up perfectly with the center line of the fuselage when the wings are aligned and everything is perfect. All measurements were closer than 1mm tolerance and I feel good about this airplane. Four more to go to this stage this week. Once satisfied, again, we tighten the bolts and it's coffee time

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