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Potez-Bloch propellor 1915 - what was so special about it ?

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  • Potez-Bloch propellor 1915 - what was so special about it ?

    I have come across mention of the Potez-Bloch propellor (invented by Henri Potez and Marcel Bloch - later of Dassault - in 1915).
    As Wikipedia says most Allied aircraft were equipped with it thereafter, I wondered what was so special about it.

    I am sure one of you experts will be able to tell me!

    Angela
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