Helios Prototype

Helios Prototype (클릭하면 커져요.)

Aircraft Specifications

Wingspan:	247 ft
Length:	12 ft
Wing Chord:	8 ft
Wing Thickness:	11.5 in. (12 percent of chord)
Wing area:	1,976 sq. ft.
Aspect Ratio:	30.9 to 1
Empty Weight:	1,322 lb
Gross Weight:	Up to 2,048 lb., varies depending on power availability and mission profile.
Payload:	Up to 726 lb., including ballast, instrumentation, experiments and a supplemental electrical energy system, when developed.
Electrical Power:	62,120 bi-facial solar cells covering upper wing surfaces. Cells are silicon-based, and are about 19 percent efficient in converting solar energy into electrical power. Lithium battery pack backup power to allow limited operation after dark.
Propulsion:	14 brushless direct-current electric motors, each rated at 2 hp. (1.5 kW), driving two-blade, wide-chord, 79-in. diameter laminar-flow propellers designed for high altitude.
Airspeed:	From 19 to 27 mph cruise at low altitudes, up to 170 mph ground speed at extreme altitude.
Altitude:	Designed to operate at up to 100,000 ft., typical endurance mission at 50,000 to 70,000 ft.
Endurance:	With solar power, limited to daylight hours plus up to five hours of flight after dark on storage batteries. When equipped with a supplemental electrical energy system for nighttime flight, from several days to several months.
Primary Materials:	Carbon fiber composite structure, Kevlar®, Styrofoam leading edge, transparent plastic film wing covering. Kevlar and Nomex are registered trademards of E.I. Du Pont De Nemours and Co.

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