Coyote E (oz16143)

About this Plan

Coyote E. Radio control sport model for electric power. Wingspan 38-3/4 in, wing ares 237 sq in. Uses foam construction.

Note this plan is a free download available from the Model Aviation site at https://www.modelaviation.com/article/mike-hausners-coyote-e where it appears along with the full build text and some good build pics. Also a free download of the plan in tiled format.

Quote: "Simplistic construction and gentle flight characteristics await you. Coyote E, by Mike Hausner.

My goal was to design a foam model that went beyond the usual flat-sheet wing. I was also interested in enticing members of our club, The Village E-Flyers in central Florida, to build an airplane from plans. Newcomers can be intimidated by the covering process and all of the tools required, so this model is made of 3 mm and 6 mm Depron foam sheet.

It had to be easy to build, but I wanted a model that few well, too. I made the decision to use a three-dimensional flat-bottomed wing and a simple, self-jigging, built-up fuselage. I used the basic shape of the full-scale RANS Coyote ultralight airplane and, since I only had pictures to go by, I applied model-design parameters to proportion the model.

As designed, the model has sufficient strength for normal flight loads and mild aerobatics. Don’t be tempted to overpower it. The prototype shown here flies fine on 87 watts of power.

The tools required to construct the model are limited to the basics: a hobby knife, a straightedge and ruler/yardstick, drafting triangles, a hobby saw (for the plywood parts), a 6-inch square, blue painter’s tape, sandpaper and a sanding block, pliers, wire cutters, a felt marking pen, and a flat building surface. Most gluing on this model is with contact cement. Use epoxy or CA adhesives where noted.

Before starting, read the instructions all the way through to get a better idea of the building process.

Building the Fuselage: The fuselage is designed to be self-jigging. Start by laying out the templates on the foam board. Spray contact cement, such as 3M Super 77, can be used to temporally attach the template to the foam. Because all of the parts are defined by straight lines, you can mark the corners by cutting through the pattern with your hobby knife and then cut between the corners using a straightedge. Try to keep the knife at 90° to the foam board.

On the fuselage sides, lay out the locations for the formers and servo rails with a fine felt-tip pen. Scribe vertical lines on the fuselage sides at the locations indicated on the plans using a dull pencil. This will aid in bending the sides later. Test to see that each crease allows the side to bend approximately 5° without cracking. Experiment with this procedure on a piece of scrap foam board so you don’t make the crease so deep that it weakens the fuselage sides. Don’t forget to cut the holes for the wing hold-down dowels. Glue the following pieces to the right fuselage side..."

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