Junior 9 (oz963)

About this Plan

Testors Junior 9. Control line stunt for .09 engines, Wingspan 27 in.

Planfile includes full build instructions.

Quote: "INTRODUCTION: TESTOR'S Junior 9 is the third in a series of four progressive achievement level kits designed to train the amateur modeler in the art of building and flying control-line stunt planes. If you haven't already done so, you should first build a Freshman '9' and then a Sophomore '9' before, building this model.

This kit has been carefully engineered to match the McCOY '9' Engine, the TESTOR'S-McCOY '9' propeller, and TESTOR'S '39' Fuel. This tailored combination will provide the Modeler with a matched power unit and a perfect third step in the bobby of control-line flying.

After you have successfully built and flown your junior '9', you should plan to build the fourth model in the series, the Senior '9' which offers you the ulti-mate of stunt performance in control line dying. If you intend to use your present McCOY '9' (or similar she engine) for the entire series, always buy the kit with the green label.

STEP No.1 If you do not have a sanding block, make one from a block of wood approximately 6 x 2 x 1 in as shown. It is best to wrap the sandpaper around the block and fasten it with thumb tacks. This makes it easy to replace the sandpaper when it becomes worn. Use number 1/2 sandpaper for rough shaping operations, and number 3/0 for smooth shaping. The sanding block is used to shape the tips of the wing, and round the edges of the rudder and elevator parts. Remember to sand with the grain of the wood during every sanding operation.

STEP No.2 Start assembly of the model by building the wing. Remove the seven wing ribs from the die-cut sheet and sand off any fuzzy edges. With a pencil, mark off the hollow leading edge into six equal divisions and, using TESTOR'S Formula 'B' Cement (see Fig. 2) set the seven wing ribs into place, one at each end and one at each pencil mark. The rib marked R-1 goes in the center, R-2 next, then R-3, and BA. Make certain the ribs all line up perfectly by sighting across the pointed ends.

After the ribs are dry, cement one of the 1/16 x 4 x 24 in Tapered Balsa sheets into place to form the bottom side of the wing. TESTOR'S Planking and Sheet Covering Cement should be used for this application and common pins serve to hold the sheet wood in place while the cement dries.

Locate the correct position from the top view drawing, and cement the 5/8 a 5/8 x 1-3/4 in pivot screw block into place, (see Fig. 2). Allow the cement to dry and carve the block to the same contour as the wing rib. Marking the pivot screw location on the bottom of the wing at this point will identify the position of the block after the wing is completed.

Bevel the rear edge of the bottom wing sheet covering (see main drawing wing cross-section, also Fig. 2) and cement the top wing sheet covering into place with Sheet Covering Cement. Sand the ends of the wing square with the sanding block and cement on the wing tips with TESTOR'S Formula 'B' Cement. The correct position can be determined from the top view drawing. After the tips are dry, they should be rounded with the sanding block to the same cross-section as the leading edge... "

Note the Junior 9 was also featured as model of the month in Air Trails, Sept 1950.

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