..."Here our gang getswiped out by a helicopter... 
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...I snapped over the starting switchand the whir of the helicopter vanes overhead told me all was well...
Various 「Astounding Stories, May, 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」
...Satisfied,he cut the Rahl-Diesels, gunned the helicopter props and droppedlightly down on the stubbly field of Sola Ranch...
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」
...Highabove, the helicopter had ceased climbing and hovered motionless...
Various 「Astounding Stories, February, 1931」
...Asthe plane fired, the helicopter shot forward like an arrow from a bow,and thereby spelled its doom...
Various 「Astounding Stories, February, 1931」
...Dirk then stopped the plane and heldit poised in the air with the helicopter...
Various 「Astounding Stories of Super-Science, March 1930」
...He twirled the helicopter starter, and she roared and zoomed, takingan angle of a hundred and twenty-five degrees upward off a runway oftwenty yards...
Various 「Astounding Stories of Super-Science, October, 1930」
..."We've got them now, sir!" Dick heardabove the whine of the helicopter engine...
Various 「Astounding Stories of Super-Science, October, 1930」
...He pushed home the soaring lever, to neutralize the helicopter and theplane still soared...
Various 「Astounding Stories of Super-Science, October, 1930」
...Dick leaped into thecentral cockpit, swung the helicopter lever...
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」
...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」
... American flyer, startled intoa frenzy by the fate of his fellows,put his helicopter into action,and leaped madly out of the midst ofthe battle...
Various 「Astounding Stories of Super-Science April 1930」
...The speaker in the helicopter boomed above their heads...
William Fitzgerald Jenkins 「Invasion」
...he droning, monotonous hum of the helicopter over their headscontinued...
William Fitzgerald Jenkins 「Invasion」
...Silence, save for the droning hum of the helicopter...
William Fitzgerald Jenkins 「Invasion」
...He dodged it, and the helicopter wasjust overhead and more smoke spouted, and more, and more...
William Fitzgerald Jenkins 「Invasion」
...With a purring noise the helicopter shot upward...
Murray Leinster 「Morale」
..."Hullo," said the helicopter man in a dreary levity, "there's a portablevision set in this car...
Murray Leinster 「Morale」
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