How to build a boomerang

First you need suitable material. The best is multilayered plywood which has one or better two layers per mm srength at least, like Finnish birch model aircraft plywood. The following crafting instruction refers to this material.

The tools and materials you need: a jig saw or a fret saw, a rasp, a file, sand paper of 80 and 180 grain, two vices, the edge of a table, a pencil, a brush, undercoat and varnish.

When using electric machines like band grinder or power file, it is urgently recommended to use protection glasses. When working with Fibreglass reinforced materials or Paxoline we warn you to wear a protection masc against fine dust.

A construction plan containing the shape and the profile of a boomerang serves as a pattern.

If you intend to make a model for left-handers from the pattern of a model for right-handers or vice versa, just copy the mirror image of the construction plan to the wooden board.

Based on a standard shape I am now going to describe the single steps of work.

Choose the side of the wooden board as the upper side of the boomerang which is bent up at the edge. Thus you make sure that the boomerang first of all does not get a negative bend (later I will say more about this).
Draw the shape of the boomerang onto the wooden board so that the grain runs horizontally from one wing end to the other. This will make the boomerang more resistant against breaking.
Saw out the boomerang blank drawn onto the board with the jig saw or the fret saw.
Draw the airfoil onto the blank.
Fix the blank with the clamp to the edge of the table.
Work out the desired profile with rasp and file. Here the front edge should be made round and the bevelled edge should be made straight.
Use 80er sand paper first and then 180er sand paper to give the boomerang a fine grind.
Put a coat of grounding for wood (quick grind grounding is best) on the finished boomerang. When the grounding is dry, sand it another time with fine-grain sand paper. Varnish with transparent or coulored varnish just as you like.
Now the first throws can be made. You may have to do some reworking on the profile.