Tri-Pacer. Control line scale model for Cub .074 engine.
Quote: "Tri-Pacer by Paul J Palanek. A smart model of a smart airplane, the popular Piper Tri-Pacer. Power is an .074 Cub.
Designed for AA work, our model spans 22 in and sports an area of approximately 85 square inches, with a Cub .074 up front. This installation proved to be plenty hot. Construction is simple with the full size plans. The fuselage is first. The sides are cut from 1/16 medium hard sheet balsa. Cut to outline shown, then slice along the length of the fuselage. Formers D, E, and F are formed from 1/16 sheet (note grain); firewall B is formed from 1/8 plywood. Cement D and E in position, then F. Cement the fuselage halves together at the tail end. Firewall B is now added and cemented securely in place.
While the fuselage is left to dry, the landing gear is formed. The strut is one piece of .032 aluminum sheet and trimmed to proper outline. A 1/16 diameter hole is drilled to receive the axle and a 1/8 hole at the top for the one-piece brace. Two 5-40 holes are also drilled for fastening of the gear. The brace and axle are formed from one piece of 1/16 wire. Assemble the two units by pressing the wire ends into the proper holes. Cement the 1/8 plywood bellcrank platform and bolt the 2 in Veco bellcrank in place.
A hard balsa block is cemented to the firewall to carry the engine. For a different engine choice, a different engine mounting arrangement must be worked out. Install the fuel tank as shown after which the lower portion of the fuselage can be covered with 1/16 sheet balsa. Note that grain runs across fuselage. Cement a strip of balsa to the floor of the cabin and forward of former D. The main gear is then bolted to this cross piece using 5-40 nuts and bolts; cement nuts securely.
The tail surfaces are made from 1/32 plywood. Cut to shapes shown and note that elevator control is on right half only. The rudder and fin are made in one piece, then cut along'the hinge line. Break and cement as shown. With the cloth hinges and horn added, the elevator and stab assembly can be cemented in place. When properly dried, the rudder is added next.
With the tail assembly in place, cut holes in the three aft formers, and slip in place the pushrod, which comes through the fuselage on the right side. Solder all loose ends. The lead-ins are .032 wire; form a hook on one end and solder to the crank. Cabin former C is added along with the forward top sheeting..."
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This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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