Engine Mount Fitted!

During the process of marking the hole, it helped considerably to block up the engine mount with a small piece of wood that was on hand. Here, the trimming down to the black firewall material is much more complete than shown below.

One of the engine mounting bolt holes on the left-lower side of the cockpit, near the nutserts where the rudder and brake pedals will mount. Here, a spare screw marks the hole, which was soon enlarged to 6 mm. The other hole visible is from manufacturing the fuselage and will be filled with epoxy at some point. The hole turned out to be rather near the gray material that makes up the floor, so I'll probably have to trim the edge of that away so that the washer will have a flat surface to rest on. The engine mount will, of course, have quite a bit of weight on it, in addition to pulling the aircraft.

Preparation of the mounting points on the firewall included removal of shiny metallic foil, and the removal of the underlying layer of fiberglass cloth, down to the black fiberglass firewall material. For that, it helped that I found a very small set of snips in my dad's toolbox. A pilot who started me in flying, he would surely have approved the use of his tools in building a motorglider.

And here's the result--my engine mount fitted to the firewall of the Sinus. It's hung there loosely for now. It will be mounted to the engine, and then the whole assembly will be hoisted and mounted back onto the firewall. The bolts will be installed and tightened, using (blue) Loctite to make sure they don't loosen. The two lower-outside bolts are 6 mm while the other three are 8 mm.