Dirty Birdy
Ron decided to use a music wire tool (above left) he constructed for the wing servo installation in lieu of the string. Dihedral brace (above right) has strength to spare! This is certainly a sturdy Dirty Birdy! A little sanding on the dihedral
brace corrected this slight wing leading edge misalignment (below left). Blue for the carb line, and red for the muffler pressure line (below right) helps insure correct tank to engine connections.
exit into the fuselage. The aileron linkage is simple and effective—a 2–56 rod threaded for a clevis, with a 90-degree bend at the aileron control horn. Be sure to install the keeper on the pushrod at the servo end. If for whatever reason, the pull through string gets lost, it can be replaced by a mu- sic wire tool threaded through the wing. I’ve
found a tool made from wire with a diame- ter of .028 inch has the right amount of stiff- ness and flex to work nicely.
Assembling the two wing halves went eas-
ily using the instruction manual. The dihe- dral brace is aluminum, sandwiched on both sides with light plywood. That is way more strength than needed! I just could not resist
the temptation to reduce weight a bit by drilling holes in the aluminum before gluing the sandwich together, though that only saved about 3⁄4 ounce.
Trial fit the glued dihedral brace sand- wich into the wing sockets. A little sanding may be needed on the front or back of the brace to get a good slip fit into the wing sock-
The recommended OS .65AX and included nose gear (above left) are mounted on the firewall. A template (above right) is constructed to aid in the
56
fitting of the cowl. A set of curved scissors worked great for the first cuts on the cowl. A Dremel tool sanding drum was used for final trimming.
NOVEMBER 2012
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