Your boomerang doesn't return perfectly? In most cases, the reason is an incorrect throw . The following troubleshooting guide should help you to fix the problem.
Your boomerang should fly more ore less like depicted above. Some models fly higher with a nice a hover at the end.
Your boomerang climbs high and then crashes down dramatically:
Use less tilt. Never throw your boomerang sidearm! Hold your boomerang vertically with no layover. If your throw is correct, check the boomerang for warpage. Put it on a table. The boomerang should be perfectly flat (exception: MTA boomerangs).
The boomerang flies high, goes down and nearly hits the ground halfway round:
Aim a bit lower. If this won't help, throw with more power and/or spin.
The boomerang lands to the left or behind you:
Throw further to the right (relative to the wind). On calm days: Throw with reduced layover.
The boomerang flies very high and crashes on return:
Aim much lower!
The boomerang lands to the right or in fornt of you:
Throw further to the left (relative to the wind). On calm days: Throw with more layover.
Boomerang returns short:
Throw with more power and/or spin. Try throwing lower or with a little more tilt.
Boomerang goes over your head and slides back to the left:
Throw with less power or less tilt.
Boomerang goes straight:
Be sure you are throwing a right handed boomerang. Make sure your thumb is on the curved top side.