Boomerang was thrown with too little layover. Throw with a little more layover. Boomerang was thrown too high. Throw boomerang lower. Aim at a point just above the horizon.
Boomerang fails to climb into the air, hits the ground and cartwheels.
Boomerang was gripped with the flat side towards you. Turn the flat side away. You threw the wrong-handed boomerang. All rights reserved.