Foam Squirrel build

I got some nice foam for experimenting with my new designs.

I decided to make a Squirrel out of it.

It came out quite nice and it flew well (see video below). If you want to try one, get in touch with me at or find details at my Web site.

You can use tacky glue (craft glue) everywhere for this method of making a Squirrel.

Step 1,2,3

Step 1

Glue wing seat to motor stick. There is a pinky width gap from the front of the stick to allow for the propeller mount. Also, be sure that it’s aligned flush to the thin side of the stick. Apply glue using a toothpick as with the balsa Squirrel. You’ll need enough glue that the toothpick will look like a small q-tip with the blob of glue at the end.

Step 2

Glue toothpick to fin leading edge. This should stick out the bottom by about 1/4 inch.

This is the rear motor hangar. Notice this is the whole toothpick unlike in the balsa Squirrel where it’s 1/2 the toothpick.

Step 3

Glue 4″ leading edge to tail plane. This should be centered by eye.

Notice there is a little hole in the tail plane. Later the motor hanger (toothpick) will come through this hole.

Step 4

Step 4

Glue leading edge to bottom of wing.

If the leading edge is too long, just snip off with scissors.

Also add shim to the center of the leading edge. Just guess where the middle of the wing is.

If the wing foam is curved, the leading edge will be glued to the concave side.

With this method, the angle of attack of the wing will be higher than the balsa and tissue Squirrel.

I was predicting that the wing would need to be mounted further back because of this.

The wing may also need to be further back because this material is heavier than balsa and tissue. So the tail pieces will move the center of gravity back.

Step 5, 6

Step 5

Glue 2″ trailing edge to top of wing.

You can estimate where the center is.

It’s only necessary in the center to help with the elastic band that holds the wing on.

That’s it for wing longerons.

Step 6

Glue winglets on. If curved, let them curve towards the outside.

That’s it for the wing.

Just 6 parts (wing plate, two wiglet plates, leading edge, shim, trailing edge).

Three foam and three balsa parts.

Step 7,8

Step 7

Glue the fin to the side of the motor stick.

Make sure the tooth pick points down and the wing seat points up. The wing is on the top, and the toothpick (motor hangar) is on the bottom.

This may need a weight on it but I managed to use a couple of clothes pins to clamp it.

Don’t forget to make the bottom of the fin flush with the bottom of the motor stick and have the toothpick sticking out the bottom of the motor stick by about 1/4″.

Step 8

Glue the tail plane in place. Make sure the toothpick comes through the hole in the tail plane.

This allows the leading edge of the tail plane to brace the toothpick against the force of the elastic motor.

If the foam has a curve, this may prove to be tricky. You may need to clamp it or use masking tape to hold the parts together.

That’s it for gluing. Once your satisfied that the glue is dry, you can mount the wing and go flying.

Step 9

Mount the wing using a small elastic band. It’s a basic strap on deal. You can see a video of how to do it at the official Squirrel web site.

Step 10

Mount the propeller and motor. Don’t forget to use the toothpick as the rear motor hangar.

You can see a video of how to do this at the bottom of this Squirrel Instruction page.

Step 11

Go flying!

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