...he muffled beating of great helicopters was sounding in his ears;outside, a ship was landing... 
Various 「Astounding Stories, August, 1931」
..."Send four helicopters," he said slowly, "to sweep that space...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...The helicopters were taking off...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...If anytanks crawled there, in the spaces the helicopters swept clear, theywould be visible at once and would be shelled by batteries miles away,batteries invisible under the artificial cloud-bank...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...The enemy sent four helicopters in a widesweep behind the American lines, escorted by fifty fighting planes...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...And it would be logical that he fought off our helicopters to keep themfrom discovering his tanks massing in that area...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...The fighting had stopped, along way off, apparently because the helicopters had been withdrawn...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...When he is sure of it—his helicopters will sweep across anyminute, now, to see—he'll throw his whole force on our front line...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...Flat-decked, all of them; busy places of hangars and machine shops andstrange aircraft, large and small, that rose vertically under the liftof flashing helicopters...
Various 「Astounding Stories, May, 1931」
...No helicopters swung theirblades above; there were only the bulge of a conning tower and theheavy inset glasses of the lookouts...
Various 「Astounding Stories, May, 1931」
...Harkness well knew what was expected of thepilot when that humming sounded; yet, with total disregard for thesafety of his helicopters, he dived at full speed for the denser airbeneath...
Various 「Astounding Stories, May, 1931」
...His speed of descent built up to appallingfigures until his helicopters found air to take their thrust...
Various 「Astounding Stories, May, 1931」
...High over No Man's Land—queer how those old phrases last—a covey ofenemy helicopters hung, waiting for the barrage to lift...
Various 「Astounding Stories, May, 1931」
...The two fighting machines hung for a second side byside; Lance eased off his helicopters and streaked away into the gloomat a breath-taking five hundred...
Various 「Astounding Stories, February, 1931」
... as he stopped the helicopters...
Various 「Astounding Stories, February, 1931」
...Dick pulled the soaring lever, and she hung there, buzzing like a beeas her helicopters, counteracting the pull of gravity, held hercomparatively stable...
Various 「Astounding Stories of Super-Science, October, 1930」
...A thousand feet beneath theflight was taking up positions, hovering with the helicopters, lookingup to Dick for the signal, and waiting...
Various 「Astounding Stories of Super-Science, October, 1930」
...Barrel-winged, like aJantzen: multi-propellored: and with folding helicopters for thevertical lifts and descent...
Various 「Astounding Stories of Super-Science, October, 1930」
...The muffled beating of great helicopters was sounding in his ears;outside, a ship was landing...
Charles Willard Diffin 「Brood of the Dark Moon」
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