I use tape on every motor held with a hook since I have had too many eject past the hook.Try wrapping a thin strip of masking tape around the hook and motor at the aft end
Can you please post pics of the engine installed in your rocket? This would allow us to better diagnose a possible issue.
Example for engine hooks:Can you please post pics of the engine installed in your rocket? This would allow us to better diagnose a possible issue.
Sometimes the engine hook itself can be improved by simply bending the retaining part slightly more towards the motor.
Some motors have areas meant for the hook and not placing it correctly will not retain the motor in place enough at ejection. Example:
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