About this Plan
Jumbo. Simple profile scale airliner model, for Jetex power.
Quote: "Designed for quick-building, kids, and school-yard flying, a Jetex-powered model of the 500 - airliner of the 1970's. Jumbo, by Dick Mathis.
THE 'Jumbo' is a model of the Lockheed-500, the civilian counterpart to the C-58 cargo ship now being built for the military. The 500, along with the Boeing 747, will be the first of the giant Jumbo airliners of the 1970's. They will be the largest airplanes in the world, capable of carrying over 500 passengers.
You can build our rocket-powered Jumbo, buy motor and fuel, for less than $2.50. The rocket motor (Jetex 'Hellcat,' available at most hobby shops for $1) uses solid fuel pellets which will cost 10c per flight, and are very safe. No special skills or tools are needed to operate the Jetex, since it has nothing to adjust, and is ignited with a simple fuse. It never wears out, and, most important, it sounds and performs like the real thing! All you do is load it, which takes only a minute or two. It gives about 3/4 oz of thrust for 15 seconds, which is ample enough to carry the Jumbo over 50 feet high, before it starts its glide.
The Jumbo is all sheet balsa, so you just cut the parts out and glue them together. No paper covering, or painting is necessary, and markings like the cockpit, windows, and elevator outlines are made with a ball-point pen. If you make good strong glue joints, the ship will be practically indestructible.
To begin yours, go to the hobby shop and purchase one sheet of 1/16 x 3 x 36 in, and one sheet of 1/8 x 3 x 36 in balsa wood, plus a small tube a cement (not plastic cement). You will also need a few straight pins, a straight ruler, and a sharp modeling knife, and of course, the Jetex motor and fuel. All of the necessary wicks and gaskets are supplied with the fuel.
Study the plans, which are shown fullsize so you can take the outlines of all the parts directly from them. Do this by placing the piece of balsa underneath the plans. and making pin holes through the plans and into the wood along the outline shown. Then the pin holes will give a good guide for cutting the actual part out accurately. It also helps to guide your knife with a straight edged ruler to make clean cuts. After cutting out all the parts, you should make whatever marking you want with the ball-point pen. A straight edged ruler will make it look neater.
Before assembling the plane. sand all parts smooth with fine sandpaper. Then, using the ball-point pen, mark the balsa for the outlines of the control surfaces, name, and other decorative details.
Over a sheet of wax paper, join the wing halves. One half is pinned down to the building board and the other is jacked up at a slight angle so that its tip is one inch above the surface of the board..."
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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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