| 摘要 |
PROBLEM TO BE SOLVED: To provide a light irradiation device for a locus of a rotary blade capable of easily measuring and easily visually checking the rotational locus of the rotary blade of a helicopter or the like. SOLUTION: A color-different straight concentrated light emitting element 3 and a light emitting element 10 for emitting light at a wide angle are mounted to the fore end of each rotary blade 4. The rotational locus can thereby be measured while ensuring a safe distance from the rotary blade. Further, since a posture position and an angle of the inclination of an air frame can be visually checked, the air frame can be steered by correct determination. COPYRIGHT: (C)2008,JPO&INPIT
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