Model is covered with medium weight silkspan (above left) and sealed with nitrate dope. If you can find Krylon H2O paints they provide a very realistic finish for the model. The assembled landing gear with fairings (above right) that, on
into place. I used birch for the rear spars and birch for the main spar stub. Diagonal brac- ing was added to the prototype because the soft trailing edge tended to bow. If your trailing edge remains straight there may be no need for the diagonals. To form the wing leading edge use soft 1⁄32-
inch sheeting cut to the proper width. Soak this material thoroughly with warm water, then tape both required sheets onto the leading edge of the wing of a completed mod- el with a similarly shaped leading edge and let it dry. Glue and pin the preshaped lead-
the full scale airplane, cover long shock absorbers designed to survive the impact of a parachute recovery. The model, with its lower inertial forces, provides adequate shock absorbing capability.
ing edge material onto the lower spar and let dry.
Now apply glue to the rib tops, bottoms
and the top spar. Pull the sheeting over onto the top spar, glue and pin in place. Use #16 rubber bands around the wing to pull the sheet firmly to the ribs. Building the mock scale motor is much
easier if you have laser-cut parts (available from Jake at Specialized Balsa Wood, LLC,
www.specializedbalsa.com). Build up the crankcase over an appropriate arbor using wax paper to prevent the balsa from stick-
ing to the arbor. Build up the cylinders over a 1⁄4-inch dowel using the laser-cut disks. Leave the dowel long enough to reach across the crankcase on the bottom end and long enough to simulate a spark plug on the top end. Install simulated cooling fins on the head and glue the heads on. Cover your model with medium weight silkspan using full strength nitrate dope. You can also use a heat-shrink type materi- al, which will probably be stronger, but the texture of silkspan and dope seems to be of better scale character for this model. Cover
FLYING MODELS
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