Still working on the motorbox modification.

I dialed in some right thrust and also a bit of down thrust. You can see that I've used 2 layers of 1/8" lite ply as the sides of the motorbox. Glued these together last night with some 30 minute and pressed them overnight under about 20 pounds of weight. The inside piece on the right side of the motorbox is 1/8" shorter than the inside left piece. This gives me the right thrust. The bottom of the firewall is 1/8" back than the top. Thats my up/down thrust.

Did I measure anything to calculate exactly how much down thrust I need? No. I'm using the old "thats about right" engineering philosophy. Been using it on a lot of kits over the years and I'm getting pretty good at it. Worked on the Sig 4*120. Worked on my last Extra before that.

All I did was cut the right side inside piece 1/8" shorter. Both pieces the bottom is move back 1/8" for some down thrust. Thats it.

Had to make a couple formers. I took the F17 former off the bottom of the fuse and incorporated it into the former you see in the pics. I'll call it F2a. I added a former at the back of the motorbox. You can see the center former that runs horizontally through the fuse has been cut out at F3. The top fuse former (1/2 moon and 3 notches for stringers..F20?) that makes up the top of the dash panel has been replace with the lite ply former you see at the back of the motorbox.

Still need to glue it all in. The front of the fuse sides will be measured and squared up perfect. They are within a "frogs hair" right now, but I want it perfect. Then I'll set the rear motorbox former in place and line it all up so my motorbox is level. Clamp these all in and when they are dry, I'll add tri-stock in a few places around the formers.

Then I'll need to glue the motorbox into the formers. Tri-stock it. I'll leave the top of the motorbox open until I'm almost done with everything. It's usually one of the last pieces I put on a plane. Once it's glue on, there's no getting your hands in there anymore.