I thought this was pretty cool, a small personal helicopter utilizing rocket propulsion.
The Dragonfly uses 2 small hydrogen peroxide engines measuring 8 inches weighing 1.5 pounds each. Each engine is equivalent to 102 hp. It will top
out at 100 knots and the exhaust is water. It can fly for 90 minutes,and it's fuel costs under 4$ per gallon, but uses 11 gallons per hour. The
Dragonfly costs 120,000 dollars, so it ain't cheap.
After watching the vid, I am surprised at it's relative quietness compared to larger machines, and it is fairly agile and smooth. www.wired.com...
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