On each arm of the boomerang, the shape of the airfoil is reversed. In flight, right-handed boomerangs circle to the left (counter clockwise). Left-handed boomerangs circle to the right (clockwise). You have to choose the right one for your arm.
Instructions for throwing a boomerang left-handed:
1. Choose an open space with no trees,
and people within a radius of 150 feet
from the position you are throwing
(baseball field, park, beaches).
2. Stand facing the wind, then turn 45º to the left.
This is where you are going to throw.
3. Never throw a boomerang
sideways like a frisbee!
4. Hold the boomerang almost vertically.
The curved and decorated side facing to your face.
Tilt it away from the vertical position (10º to 15º).
5. Aim at something slightly above the horizon.
The throw is the same as for a dart, the forearm
should follow through. At release, give a quick
flip of the wrist to give it more spin, not too much force.
6. To catch with two hands, wait for the boomerang
to glide at arm height, open both hands flat one above
the other and then close on the boomerang to stop it
(like a horizontal clap of the hands).