Guardian (oz7247)


Guardian (oz7247) by George Moir from Model Airplane News 1957 - plan thumbnail

About this Plan

Grumman Guardian. Control line Navy Carrier model, for Fox .59 power. Carved from styrofoam.

Quote: "It would be a crime to let pass this revolutionary new way to build an airplane stronger, lighter, faster. Check supply sources at the end of the article. Guardian in Styrofoam, by George Moir.

Navy Carrier Event planes have come into their own. In the 1956 Mirror Meet, there were 64 such entries. With the wonderful help of the Navy, this event has become popular for both contestants and spectators. It taxes the skill of the pilot and is a challenge to the builder.

With the builder's problems in mind, our Guardian was designed to use Sty-rofoam as the main structural material. Styrofoam construction is much easier, lighter, and stronger than the conven-tional method of making up formers, wing ribs, plus heavy planking, etc.

This model has automatic flaps that fold up in place when the arrester hook makes contact with the arrester rope. This eliminates nicked flaps; also the rudder goes into hard-right position when the hook is lowered. This helps to keep plane taut on lines during slow-speed flight. The motor control is on a third line and can be worked independently, which means the plane can be slowed down before dropping the hook and flaps.

There are no wing ribs in the main wing, only the main spar, leading and trailing edges, with a 1/32 balsa sheeting covering the Styrofoam. The fuselage has only three formers: the tail piece, firewall, and Number 2 former that holds the landing gear wire. From the Number 2 former back to the tail piece is solid Styrofoam, covered with 1/32 balsa sheeting. This 1/32 balsa is very easy to work with. When wet, it can pretty nearly be tied into a knot without fear of splitting and, when cemented to Styrofoam with Silkspan covering, makes a very good foundation for smooth painting. For flying scale fans wishing a superb finish, I suggest using the 1/16 soft balsa covering in place of the 1/32; this will give you a good sanding surface that, when covered with Silkspan and painted, will have a very hard surface that will take a perfect compounding job.

Most modelers I meet ask, what is Styrofoam? Styrofoam is made by the Dow Chemical Co. It is a polystyrene rigid plastic expanded 40 times. It is 30 times lighter than water, five times lighter than balsa wood, will stand temperatures from subzero to 175°F without losing its original shape. Since there is no capillary action, this material will not absorb water. A piece 2 x 12 x 36 inches weighs only 12 ounces. Dopes or any acetate cements cannot be used directly on Styrofoam. This is where the 1/32 balsa sheeting protects it from the strong paints and cements. There are over 20 brands of cements and glues that can be used directly on Styrofoam without fear of disforming or melting. (List at end of article.) Tensile strength is as high as 65 pounds per square inch. Styrofoam can be planed, sawed, or cut into fine strips, using a sharp knife. A breadknife will do as good a job as any. There is no grain, so no worry about splitting.

Where can you get it? Well, the hest place I know is your local florist. If he doesn't have any handy, he can tell you where the florist supply house is; they will have plenty on hand and the price works out at about 1/6th the price of balsa wood. I used the green-colored Styrofoam because of the need to take photographs. The white Styrofoam seems to have a finer texture, resulting in a harder finish surface. Get three pieces of the White Styrofoam, 2 x 12 x 36. This will leave you enough to experiment with on a smaller sport plane. Let's start building.

As always, study the plan carefully. Get to know the layout thoroughly before starting. Obtain a Berkeley Guardian canopy and cowling. Cut to full wing size, two pieces of Styrofoam, 7 x 9-1/2 x 21-1/4 long. Trim down to the airfoil with long blade knife, then finish with coarse sand-paper for the first stage (leave 1/4 in over size). Make the airfoil similar to the one shown on profile plan. At the thin ends, always sand (strokes) in toward heavier section (middle) with medium grade first, then fine grade sandpaper..."

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Guardian (oz7247) by George Moir from Model Airplane News 1957 - model pic

  • (oz7247)
    by George Moir
    from Model Airplane News
    February 1957 
    44in span
    Scale IC C/L Military Fighter
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 24/11/2015
    Filesize: 622KB
    Format: • PDFbitmap
    Credit*: anon

  • Grumman_AF_Guardian | help
    see Wikipedia | search Outerzone

    ScaleType: This (oz7247) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

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User comments

Hey, this is actually a foamie plan, from 1957. And there was me thinking building with foam was a new thing.
SteveWMD - 04/12/2015
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