Helicopters need powerful engines to drive their rotors, and that means they use a lot of fuel.
Most U.S. experts think they are intended to serve as rotors in centrifuges used to enrich uranium.
The helicopter landed on the Miller platform, was refuelled, with the rotors running, and 14 passengers boarded.
It operates on two rotors in a fashion similar to most helicopters, but is apparently easier to fly.
Its VTOL capability comes courtesy of dual tilt-rotors that provide helicopter-style takeoffs with fixed wing speeds once airborne.
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Some are rotary, with as many as four small geared elliptical rotors creating and then foreclosing combustion chamber volume.
Whipps said he heard the sound of the helicopter rotors suddenly cut out.
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But as it re-enters the atmosphere, base first, the rotors will be deployed.
For now, aeroplanes and rotors are not slathered routinely with temperature-and pressure-sensitive paints because their sensitivity needs to be improved.
Driven by M3D technology, the Phosphor Reveal watch utilizes miniature-sized rotors adorned with Swarovski crystals that revolve to reveal numerical or chronological information.
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The X2 uses a pusher propeller mounted at the rear and has a pair of contra-rotating main rotors, one positioned above the other.
The rotors turn in opposite directions to cancel out torque, the twisting action which requires conventional helicopters to use a tail rotor a hazardous appendage.
Ordinary rotors do not work on such a small scale, so Friend's micro-robot project has a special flagellated propeller, mimicking the swimming behaviour of E.coli bacteria.
We'll still be heading to the exhibition to try and catch it in independent flight (and hoping we don't get an eye taken out by its rotors).
Ultra High Contrast Display: Depending on material or paints affixed to the revolving rotors, the M3D display technology can achieve the highest contrast of any digital display available today.
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Its main use is for troop deployment and its large engine and twin rotors mean it copes better than other models in the heat and high altitudes of Afghanistan.
The first, called Ease, is a mere foot in diameter by 16-inches tall and can fly safely in tight spaces or through open windows or doors, thanks to its petite size and ducted rotors.
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He said that in 1999 and 2000 Iraqi front companies had tried to buy a factory that produces magnets used in the process, and that Iraq had later sought machines that balance the gas-centrifuge rotors.
This time, he has an addition to his stable: a flying craft, with two enclosed rotors underneath, which allow it to dink around tall buildings and, presumably, to chop vegetables in the event that Alfred wants to make a pot-au-feu.
But the helicopter carrying the foreign photographer flew so low over the bathing area that police boats in the water began shaking due to the turbulence caused by the helicopter's rotors, Allahabad's most senior official Devesh Chaturvedi told the BBC.
First, the ducted fan design allows the car to achieve the speed and maneuverability of a helicopter -- 155 mph, 12, 000-foot altitude, two hours of flight time, vertical take off and landing -- but removes the dangers of exposed rotors, allowing the "car" to sidle up to buildings for rescue missions, or coexist in close quarters with other vehicles.
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Our tester W8 wagon had a mere 9, 181 miles on the odometer when it arrived, but it clearly had warped front brake rotors, a rattle in the automatic transmission lever from overzealous shifting in the manual mode, and bushings that had already been flogged at a level equivalent to what 100, 000 miles of driving by any ordinary owner might do.
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