About this Plan
Invader. Simple hi-start glider. Wingspan 28 in, wing area 90 sq in.
Quote: "Combining catapult and towline systems of launching, this big glider soars like a bird. Cord and rubber towline does it.
Those of us who have visited model flying fields have often noticed model builders loaded down with equipment, sweating over balky motors. The modelers having the most enjoyment with the least expense and trouble usually are those flying gliders. Why? No worries about batteries, wires, fuel, pump cans, propellers, etc. For this reason the Invader glider was designed to combine the spectacular climb of the catapult glider with the soaring glide of the graceful model sailplane. This was achieved through the use of Hi-Start, an ingenious launching method combining the best features of catapult and towline launches. With proper adjustment, the Invader should turn in flights of several minutes' duration. Construction is sturdy and simple and may be completed in a single evening.
Wing: Cut wing outline from 1/4 in sheet balsa, 4 x 28 inches in dimension. If 4 in wide balsa is unavailable, two 2 inch wide sheets may be butt-jointed together and cemented to form a 4 in chord. Trim with single-edge razor, then sandpaper to final airfoil shape.
Lightening holes may now be cut and sanded smooth. However, lightening holes in wing and stabilizer are optional and may be omitted for maximum durability, an important factor in sport flying. Wing dihedral joint is now cut and cemented, with tip blocked up for specified amount of dihedral.
Fuselage: Cut three pod sections from 1/4 in sheet balsa. Tail boom is made from 1/4 x 1/2 in pine or basswood strip 21 inch in length. Taper tail boom and cement to center pod section. Notch pod for ballast box. Cement outer pod sections in place on each side of fuselage. Trim and sand fuselage to streamline crosssection.
Tail: Stabilizer and rudder are cut from 1/8 sheet balsa. Trim and sand to airfoil section. Cut lightening holes in stabilizer and sand smooth. Stabilizer dihedral joint is now cut and cemented, with stab tip blocked up for specified dihedral..."
Invader, MAN, December 1955.
Direct submission to Outerzone.
Update 23/05/2019: Added OCR version of article, thanks to rchopper56.
Supplementary file notes
Article pages, thanks to RFJ.
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