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KCC's Quizzes: AQQ 236 about strange marking on airplane engines

Most of us, when boarding airplanes have seen all the motors marked with a kind of "comma" sign in their centers as shown

in the above picture.

Question: what is its role?



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[edited by: emassa at 8:53 PM (GMT -4) on 1 Jun 2023]
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  • Hi Kuo-Chang,

    My guess is that it is there to show the ground crew whether or not the blades are rotating or not, for safety reasons.  It could be oriented in that particular way (chirality) to also show the direction of rotation of the turbine blade.  I guess it could also be used to measure the speed of rotation with a stroboscope.  My last wild theory is that it is there to mesmerise oncoming birds!

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  • Hi Kuo-Chang,

    My guess is that it is there to show the ground crew whether or not the blades are rotating or not, for safety reasons.  It could be oriented in that particular way (chirality) to also show the direction of rotation of the turbine blade.  I guess it could also be used to measure the speed of rotation with a stroboscope.  My last wild theory is that it is there to mesmerise oncoming birds!

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