How To Build Foamie RC Model Airplanes

Are you interested in some cheap, fun RC model airplanes? Foamies have been built by DIY modelers for years, who have created an abundance of free plans and patterns on the internet. Most of the time all that you need to build a great foamie is a sheet of wall insulation, some radio and engine gear and a printer. This article will show you a general procedure that you can follow to construct foamies using common household and hobby supplies.

1. Download and print one of the free patterns available on the internet. The one that you choose largely depends on your personal building experience, the supplies you have, and the amount of time that you are willing to put into the project. Some plans need to be scaled up or down. If you don’t want to do this yourself most print shops will reproduce and scale images for you.
2. Transfer the paper pattern to the foam core you obtained earlier. There are several ways to do this, but if you want to preserve the plan you can lightly score over the outline with a ball point pen. This indents the foam below and creates a pattern for cutting.
3. Cut out the pattern that you made with a sharp hobby knife, being careful to follow the lines accurately. If you make a mistake round it out using medium grit sand paper and a sanding block.
4. Round out the leading edge of the wind a fuselage by first using medium, and then fine grit sandpaper.
5. Give the wind an airfoil by making three bends along it’s length. Some patterns include the desired airfoil section – so if yours does use it as a reference.
6. Sand some dihedral into the wing and glue the wing halves together using either foam safe cyanoacrylate or hot glue (available in most craft stores.)
7. Assemble the model using your adhesive of choice.
8. Unless your model’s pattern was meant to be glued to the foam – you will probably want to add some color. Spray paint is a great way to decorate your finished model, but be sure to use satan paint – not enamel. Most enamel paints react badly with foam.
9. Mount your servos by cutting rectangular holes in the wings and fuselage, and pressing them in.
10. The brushless motor is usually mounted by on a wooden dowel glued to the fuselage, and the radio and batteries can be secured to one side of the fuselage with velcro.
11. As a last step add the control surfaces and hinge them with clear packing tape.

If you want some free patterns and instructions, check out this RCGroups.com thread. Many foamie fans have contributed great models and posted them for everyone to use. Have fun with your foamie RC model airplanes!

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