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Why are there holes in this propeller?

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Joined
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Anacortes,wa
Some of you guys will probably know this right off. I found it amazing. The propeller is airworthy and whistles at an idle. It was in the movie "The Aviator" attached to the H 1. The owner said they put decals over the holes.
will

steve balon sept 2017 007.jpg


steve balon sept 2017 008.jpg
 

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