Sprightly Sparrow (oz13443)
About this Plan
Sprightly Sparrow. Control line sport trainer model.
Quote: "This little sport-trainer is as saucy and sprightly as its namesake. Powered by a Cub .074 or similar engine, it steps out and goes places. Yet it is so simple that the original was built in three days. Any engine of from .065 to .099 cubic inch displacement may be used. Remember, the plans are drawn 1/2 full size, so make everything double the size shown. The wing rib template is shown full-size.
FUSELAGE: Begin by making the fuselage side panels from 3/32 medium sheet balsa. Then cut out all bulkheads from 1/16 medium sheet balsa. Next, build the fuselage inverted on your work table, cementing the main B and C bulkheads in place. Attach the bottom made from 3/32 medium sheet balsa.
Now, make the 1/16 plywood firewall. Form the landing gear from 1/16 diameter music wire and attach to the firewall backside by lacing button thread through the four pairs of 1/16" holes shown. A Royal Spitfire engine can be bolted to the firewall with the pair of aluminum mounts included in the original box. A Cub .099 or McCoy .09 may be radially mounted, using metal mounts obtainable at your hobby shop.
Mount the Cub .074 engine with 2-56 machine screws and nuts. Cement the nuts to the firewall so the engine can be removed if necessary.
Add the 1/16 balsa floor for the fuel tank and install a No.2 Perfect tank. Connect the fuel line with rubber or plastic tubing. Air vent tubes must have extensions to reach outside. Just slip 3/4 in pieces of rubber tubing over the tank's two vents.
Make the horizontal tail next, from 3/32 medium sheet balsa. Install 3/16 x 3/4 in linen, silk or satin cloth hinges. Cement the tail horn in place. Then mount the tail perfectly flat on the fuselage with lots of cement.
Now, cement all the 1/16 sheet balsa deck bulkheads in place, add the 1/16 x 1/8 stringer, bend 1/16 soft sheet balsa, soaked in hot water, over the stringers and bulkheads and hold in place with 1 in gauze or cloth strips. Dry by passing over a radiator or similar warm air source.
When the wood is dry, cement in place and trim the ends last. Cement a soft balsa filler block on the back of F to fill out the top contour when carved, Add the 3/32 sheet balsa vertical rudder and cement well. Round off all the tail and rudder edges with 2/0 sandpaper. Bend up the tail skid from 1/32 diameter steel wire and press in place. Cement with several coats.
Carve the engine cowl from soft balsa to fit your motor. It is spot-cemented in several places in attaching it to the firewall..."
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