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la coiffe quel interet ?
j'ai pensé a Stipa Caproni, mais il n'a pas un double huits pales !
lle pas variable est un precurseur sur ces photos de la voile tournante d'helico ...
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ptilou
capfree
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Jun 17, 2022, 5:47:10 PM6/17/22
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Hypothèse: coiffe d'hélice d'un van de moulin, protégeant de la
poussière le mécanisme variant le pas, et qui conserve ainsi son
efficacité selon les variations du vent. Construction, apparemment
premier quart du XXème siècle.