A simple device to standardize throwing instructions.

Windage-launch angle off of the wind.

Elevation-launch angle above the horizon.

Layover-angle of the boomerang at release.

Spin-rotational velocity applied at launch.

Horizontal velocity- forward velocity applied at launch.

There are five variables which the boomerang thrower or precessionist has control over and must consider when launching a boomerang. These variables combined with prevailing winds will determine where the projectile will come to rest. The precessionist has no control over wind speed or direction, but must adjust the throw to accommodate the throwing environment.

This dialog is not to instruct anyone in the art of throwing. The point of this page is to attempt to provide a vehicle to help easily quantify the throwing variables. This will facilitate the discussion of throwing different boomerangs in various conditions with a minimum of misunderstanding. For more information on throwing click on the Throwing button below.

There is no one right way to throw a boomerang. Generally a satisfactory return can be achieved with different combinations. The precessionist will learn to adjust all of the variables to yield the type of return desired.

Standardizing the jargon of throwing makes it easier to take notes when testing new designs. It also makes the thrower specifically aware of all of the variables of the throw. When the precessionist forces himself to quantify each of the variables, he must make a conscious decision on each one. Hopefully this will lead to a better understanding of the interplay between these variables.


Windage- The angle off of the wind will depend on the type of boomerang and wind speed. The direction directly into the wind is designated as 0 degrees. Positive numbers are described to the angle as the thrower rotates to the right (left for left handed boomerangs).

Elevation- Shoulder level is designated as 0 degrees and positive numbers are described to the angle above this level.

Layover- When the boomerang is held vertically, the boomerang is at 0 degrees. The angle is described with positive numbers as the boomerang is tilted to the right (left for LH).

Spin- The rotational velocity imparted to the boomerang is described in three levels, Light, Medium, and Hard.

Horizontal velocity- The amount of power that is imparted so as to give forward motion to the boomerang is described in three levels, Light, Medium, and Hard.


To use the code 30/20/30 you just point your nose at a the wind.  Turn to your body to your favored side 30 degrees and pick out a tree.  Hold the boomerang straight out toward the tree and raise your arm 20 degrees.  Now lay the boom over 30 degrees and you are now holding the stick at the exact point you want to release it when you throw.  Rock the rang back and forth in your wrist as if you were releasing the boomerang to set that in your memory, then wind up and let er rip.

A Fast Catch boomerang launch could easily be described as 80/0/0/H/H

An MTA launch might be 10/20/10/M/L.

The last two variables can be assumed to be medium if omitted so that a boomerang could be said to be a 20/20/20.


Thanks to Gerhard Bertling for the German translation.








You probably noticed the transposition of the last two variables Geschwindigkeit and Spin from the English version Spin and Horizontal velocity. This still works out quite nicely. Thanks again Gerhard.