...A four-bladed fan lifted on a slenderpedestal, sufficiently high above thesurface of the wing for the vanes tobe free of the central propeller... 
Various 「Astounding Stories of Super-Science April 1930」
...Instantly the propellers vanishedinto a blur as the vanes of the helicopterdropped down the slender staffand the vanes themselves fitted snuglyinto their appointed notches atop thewing...
Various 「Astounding Stories of Super-Science April 1930」
...An hour later they landed on theflat roof of the new Capitol Building,sinking lightly to rest as a feather,nursed to a gentle landing by thewhirring vanes of the helicopter...
Various 「Astounding Stories of Super-Science April 1930」
...The driven vanes were powerless to stem the craft's fall...
Arthur Leo Zagat 「The Great Dome on Mercury」
..."Sounds strange, cracking up at ninety thousand feet, doesn't it? Well,hoist your helicopter vanes and drift down as straight as you can—butbe sure and keep your motor idling...
Arthur J. Burks 「Lords of the Stratosphere」
...In addition to other damage done at this time, two of the vanes of the wind-mill were torn off by the violence of the wind...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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