The GEN H-4 is arguably the smallest working co-axial helicopter ever created. It weighs just 155 pounds.
(GEN H-4 personal copter)
It uses four two-cylinder, air-cooled engines with 125 ccs displacement; each contributes about 10 horsepower. It uses about five gallons per hour. The rotors are about thirteen feet in diameter and rotate at roughly 800 rpm; they are made from a carbon-kevlar composite with a foam core.
This devices is obviously the copter harness from Robert Heinlein's 1954 juvenile The Star Beast:
They were half way home when a single flyer, hopping free in a copter harness, approached the little parade. The flier ignored the red warning light stabbing out from the police chief's car and slanted straight down at the huge star beast. John Thomas thought that he recognized that he recognized Betty's slapdash style...
(Read more about Heinlein's copter harness)
Orb Nomad Zero-Emission Electric Aircraft
'That explains how it was so easy for me to remain motionless in midair or to perch on a flagpole in imitation of a giant bird, even in the windy city of Chicago.' RH Romans, 1929.
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Prairie Madness - And Space Sickness
'Space-sickness is one of the most unpleasant sensations that a human being can experience. Not all are subject to it...'
'Old People Began to Cross The Continent In Their Own Cars'
'It was a relief to enter one of the comfortable autos, whisper a direction down the tube, and just know that you would be taken to your destination in the quickest, safest, and cheapest manner.'
Starfall Manufacturing Drugs In Space
'The vast spinning sphere of Factory in the Sky loomed above and ahead of us, gleaming white against the unfathomable jet depths of surrounding space.'
The Solar Oberth Slingshot
'And if it doesn’t work,' inquired Lazarus, 'what does that make us? Sunspots?'
'If Anyone Is Watching Earth...'
'Our study of your race has convinced us that you are not fitted to leave your planet in the present state of your civilization.'