...His helicopter props spun, and the scout nestled down lightly on thetarmac... 
Various 「Astounding Stories, February, 1931」
...He glanced over atPraed's plane, spun the small helicopter props over and pushed downthe accelerator...
Various 「Astounding Stories, February, 1931」
...The helicopter props spun around...
Various 「Astounding Stories, February, 1931」
...Finally, at a thousand feet, he setthe helicopter props in motion and hung in mid-air—directly above thevery center of the city...
Various 「Astounding Stories, February, 1931」
...I presume that youhave noticed the marks on the roof where an aircraft of some sort,probably a helicopter, landed and took off...
Various 「Astounding Stories, February, 1931」
...It was a small affair with stubbywings above which were two helicopter blades revolving at high speed...
Various 「Astounding Stories, February, 1931」
...The leading planeswerved sharply and the helicopter fired again...
Various 「Astounding Stories, February, 1931」
...The leading planemaneuvered about, trying to get a machine-gun to bear, while thesecond plane climbed swiftly to get above the helicopter and pour adeadly stream of fire down into it...
Various 「Astounding Stories, February, 1931」
...Highabove, the helicopter had ceased climbing and hovered motionless...
Various 「Astounding Stories, February, 1931」
...They would halt at intervals, to allow helicopter tenders tocome up to transfer descending passengers...
Various 「Astounding Stories, June, 1931」
...It opened its helicopter wings and drifted downward...
Various 「Astounding Stories of Super-Science, November, 1930」
...Itssilvery aura deserted it and the vessel was revealed as a sleek,tapered cylinder with no wings, rudders or helicopter screws...
Various 「Astounding Stories of Super-Science, November, 1930」
..."We've got them now, sir!" Dick heardabove the whine of the helicopter engine...
Various 「Astounding Stories of Super-Science, October, 1930」
...He released the helicopter lever and opened throttle wide...
Various 「Astounding Stories of Super-Science, October, 1930」
...I heard the helicopter engines thumping...
Various 「Astounding Stories of Super-Science, October, 1930」
...And one of the biggest of the aircraft camegingerly up to the very inner edge of the lattice-work of fog and hungmotionless, holding itself aloft by powerful helicopter screws...
William Fitzgerald Jenkins 「Invasion」
...The droning hum of the helicopter came across the broken ground...
William Fitzgerald Jenkins 「Invasion」
...The speaker in the helicopter boomed above their heads...
William Fitzgerald Jenkins 「Invasion」
...Silence, save for the droning hum of the helicopter...
William Fitzgerald Jenkins 「Invasion」
...With a purring noise the helicopter shot upward...
Murray Leinster 「Morale」
..."Now shoot the works," said the helicopter man evenly...
Murray Leinster 「Morale」
..."I'm waiting for that metal to cool off," said the helicopter pilot...
Murray Leinster 「Morale」
..."I think, sir," said the helicopter man, "that we affected the morale ofthe Wabbly's and the bombers' crews...
Murray Leinster 「Morale」
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