The Helios Prototype aircraft flying above cloud cover at approximately 10,000 feet, northwest of Kauai, Hawaii.
Credit: NASA Photo/Carla Thomas
DARPA's Vulture is yet another of the agency's blue sky programs, this one maybe more than others. Vulture is intended to fly for periods of up to five years unattended at 65,000 feet.
Here's what DARPA requested:
The VULTURE Air Vehicle Program is an exploratory development program with the overall goal to develop and demonstrate the ability to deliver and maintain an airborne payload on station for an uninterrupted period exceeding 5 years using a heavier-than-air platform system ... The government is not interested in approaches that use either radioactive energy sources or employs any form of buoyant flight for this application.
[Contractors will] ... develop technologies and systems which will enable the military to deliver and maintain a 1000 lb, 5 kW airborne payload for an uninterrupted period exceeding 5 years with a 99+% on station probability.
The intent is that DARPA's Vulture would orbit over a small, well-defined area (like a battlefield) and provide continuous coverage of that area. Vulture is intended to operate in a manner similar to a satellite, except that it has the advantage of not being bound by orbital mechanics. The only satellites that can remain stationary over one spot must orbit at 22,240 miles — and this trick works only along the equator. Low-flying spy satellites scoot quickly over their coverage area. If the Vulture can be accomplished, you would see dramatic increases in sensor resolution and communications capability.
I can't understand why none of the articles I read on this program include references to the amazing Helios program. Helios is a single wing, solar-powered aircraft that has performed admirably above Hawaii in tests performed in 2001.
Helios is essentially an ultralight flying wing with 14 electric motors built by AeroVironment Inc. Helios' 247-foot wingspan exceeds that of a Boeing 747. Operating entirely under solar power (including the take-off), Helios reached an altitude just short of 100,000 feet, which broke records for non-rocket powered flight. At that altitude, Helios approached conditions for winged flights in the atmosphere of Mars.
Writer E.B. White got very close to the Vulture idea with his description of the Stratovideo, in his scarily prescient 1950 story The Morning of the Day They Did It.
" ... after much experimentation by the Westinghouse and the Glenn Martin people a satisfactory substitute was found in the high-flying planes. A few of these planes, spotted around the country, handled the whole television load nicely. Known as Stratovideo planes, they were equipped with studios; many programs originated in the air and were transmitted directly, others beamed from the aircraft to ground stations and then relayed. The planes flew continuously, twenty-four hours a day ... " (Read more about White's Stratovideo planes)
Via DARPA pushes limits of unmanned aircraft capability to extremes. See also the DARPA Vulture project description. Here's a nice DARPA science-fictional project list; also, if you're not familiar with Helios, check out this awesome Helios picture gallery.
(This Science Fiction in the News story used with permission of Technovelgy.com — where science meets fiction)
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