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18. Bend up a sheet of .032 steel so that it just fits the tailpost/fuselage intersection. It is held on
each side by three 3/l6" bolts through the outer plywood and the uprights, and through the
tailpost by the two lower hinge bolts and one other as shown in Figure 1-11. Be sure to varnish
the wood under the anchor before installing it, and paint or cadmium plate the anchor. See
Also Figure 1-2, cross-section B-B.
19. Install the 3/4" square cross piece shown 7" ahead of the rudder post on the top longeron
view of Figure 1-8 and Figures 1-11 and 1-12. Note that this is cut half-way through from the
bottom for control cable clearance. Cover the area from the previously-installed cross piece
21" ahead of the rudder post to the rudder post with 1/8" plywood in TWO PIECES, butted
together on the centerline of the 7" crosspiece. The purpose of the crosspiece is to stiffen the
plywood ahead of the cutout in the piece of small plywood that is cut out per Figure 1-12 to
allow the elevator horn to protrude through. Nail and glue 1/8" plywood below the lower
longerons from Station 9 to the rudder post AFTER the underfin side plywood anchor stripes
have been nailed and glued in place per Figure 1-13. Drill drain holes in the bottom plywood
at the corners of Stations 9 and II and trim plywood flush with sides of longerons.
20. Build up the underfin structure as shown in Figure 1-13. The 1/4" square flanges provide side
surface for the plywood side pieces to be nailed and glued to. Note the cutout at the rear
center of the bottom rib to allow access to the tail spring support bolts that go through the
bottom of the tail post.
FUSELAGE SECONDARY STRUCTURE
The secondary fuselage structure consists of those parts added after the main framework has been
assembled per instructions in the earlier portions of this chapter. Since most of these are not
primary load-carrying parts, the builder has great leeway in the use of sizes and materials other
than those specified. The "Turtledeck" around and aft of the cockpit (see Section 6) was designed
to be removable and interchangeable with an enclosed-type canopy structure, but either type of
structure can be built on permanently if desired. An item like the forward slope of the instrument
panel is entirely arbitrary. Tall pilots would probably prefer a greater slope while short pilots
would want it more nearly vertical.
1. Cut firewall Former No. 1 from 3/8" plywood per Figure 1-14 and the three top fuselage
formers at Stations 6, 7, and 8 from 1/4" plywood. A strip of wood with a nail as a pivot and a
hole for a pencil makes a good compass to swing long arcs of circles (Figure l-15).
NOTE
The lower portion of the No.1 Former on Figure 1-14 is out of scale, so use the
dimensions as written.
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