Fabricating the Rear Tie Down
There are three tie down points on the aircraft, one on the tail
and one on each wing. Here we will install the large nut plate for
the rear tie down bolt. It is located next to the aft most bulkhead
so the load is distributed to the fuselage structure.
Obtain a ¼-20 eye bolt and a couple of nuts for the rear
tie down. Weld a nut to a 2” X 2” thin steel sheet
as shown below.
Tail Tie Down Location
. Place it just forward of the rear bulkhead and mark the
hole location on the center line as shown below. Drill a 5/16"
hole through the fuselage bottom.
Position Tail Tie Down Nut Plate
De-core the foam in the area of the hole and mix up a batch of thick
micro. Wax the threaded portion of the eye bolt with mold release. Fill
the hole with the thick micro and work it into the de-cored area. Apply
thick micro under the metal plate. Install the eye bolt up
through the hole and into the metal plate. Hang a weight from
the eye bolt, about 10 pounds and let the micro cure. Apply
a 4 layer fiberglass laminate over the metal plate extending at least
1.5 inches onto the fuselage bottom and up the rear bulkhead. Let
cure.
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