F-82 Twin Mustang. Control line profile scale model for twin .35 engines.
Quote: "A control-line show-stopper, this profile F-82 is as startling in appearance as the real one. It's easy to build, too! Twin Mustang, by Terry D Aldrich.
BUILT by North American Aviation Inc, and designed as a long-range, high-performance fighter-bomber, this twin-engine, twin-fuselage aircraft was test flown July 6, 1945. Our model is a profile, scaled one inch to the foot, giving a wing span of 52.5 in. Two 35 McCoy powerplants provide more than enough get up and go to give all the thrills one could want in an aircraft.
Used as a show plane, it is a crowd pleaser of the first order. Painted all black with white trim and rubbed out to a high polish, this plane becomes something one enjoys having.
The airfoil shown was used because of the anticipated weight of this type of model. For those who want more than level flight and loops, a symmetrical airfoil may be substituted.
Fuselage: Use hard-grade balsa 6 x 36 x 1/2 in stock for the fuselage. Cockpit and airscoop are butt glued from scrap. The fuselage is tapered from rear of cockpit to rudder, per the drawing. The 1/8 hard-grade plywood doublers extend from the nose to halfway past the wing leading edge.
Motor mount material is 1/2 x 3/4 x 6 in hardwood. Distance between the mount bearers depends on the motor used and crankcase size. The 2-1/4 spinner is a Veco product.
The 35 powerplants are mounted with the cylinders to the outside of circle. Drill 1/8 holes and use 4-40 lock nuts and bolts. (Blind nuts may be substituted.) On some engines the needle valves will need to be in the top position, for ease of making adjustments. Side mount 4-oz tanks, using strap-type hold-downs. Fuel filters are an extra safeguard for reliable and smooth running.
Make left and right 1/8 landing gear struts for 2 inch wheels (Perfect or Veco). Also, bend left and right tailwheel struts, using 1/16 wire set in hardwood. The hardwood is recessed into the fuselage. Make two metal main-gear skirts. Attach them with nylon clamps.
The vertical tails are 7-1/2 in high. Use 3/16 thick balsa, rounded as shown. The rudder is tapered and offset to outside of circle to maintain line tension.
The horizontal stabilizer is 3 x 14-11/16 x 1/4 balsa. Elevator is 1-1/2 x 14-1/2 x 1/4, tapered. Note that the horizontal stabilizer is countersunk into the vertical stabilizer for extra strength. Distance between one vertical stabilizer and the other verti-cal stabilizer is 14-1/2 in. Make figure-eight elevator hinges from waxed string.
Wing: The center section rib length is 10 in. A standard lifting airfoil is used. A symmetrical, stunt airfoil may be substituted for the full pattern. Cap strip the ribs with 1/4 x 1/16 balsa..."
F-82, American Aircraft Modeler, June 1968.
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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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