Chopper

A distant ancestor of the V-22 Osprey tilt-rotor aircraft, this looks unlike most pictures of the de Bothezat Flying Octopus of the same period (Popular Mechanics, March 1921). It is described as being tested “in an isolated hangar upon the western outskirts of Chicago.”

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Goose Gun

This Belgian-made six-barreled .22 rifle (Popular Mechanics, March 1921), one of Henry Pieper’s “goose guns,” is more elegant than the Nock Gun made famous by Daragh O’Malley in Sharpe’s Rifles, but scarcely more practical.

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Biplane-bladed Helicopter

n 1921, Argentinian inventor Raúl Pateras Pescara created this advanced helicopter with counter-rotating props–each made of SIX small biplane wings! The 1931 version looked considerably more modern (Popular Mechanics, April 1921).

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By Bundesarchiv, Bild 102-12592 / CC-BY-SA 3.0, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index.php?curid=5480596