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This optimizes fuel efficiency, mostly due to the low temperatures encountered near the tropopause and low air density, reducing parasitic drag on the airframe. Stated another way, it allows the airliner to fly faster while maintaining lift equal to the weight of the plane.
It took off from Edwards Air Force Base with a 50/50 blend of Fischer–Tropsch process (FT) synthetic fuel and conventional JP-8 jet fuel, which burned in two of the eight engines. On 15 December 2006, a B-52 took off from Edwards with the synthetic fuel powering all eight engines, the first time a USAF aircraft was entirely powered by the blend.
All practical airbreathing jet engines heat the air by burning fuel. [1] Alternatively a heat exchanger may be used, as in a nuclear-powered jet engine. [6] Most modern jet engines are turbofans, which are more fuel efficient than turbojets because the thrust supplied by the gas turbine is augmented by bypass air passing through a ducted fan. [4]
Following this, the program team installed and ground tested the aircraft's hydrogen-fueled generator and liquid hydrogen fuel tanks which will power it for up to a week in the stratosphere. [6] The first flight of the Global Observer using hydrogen fuel occurred on 11 January 2011, reaching an altitude of 5,000 ft (1,500 m) for four hours. [7]
SolarStratos is an aeronautical project aimed at flying a piloted solar-powered airplane for the first time to the stratosphere.The SolarStratos airplane is equipped with solar cells but is not able to fly directly on solar power, thus is accurately described as a battery powered electric airplane that is equipped with solar cells; it is planned to be the first crewed solar-equipped aircraft ...
Black carbon in the atmosphere is like dressing Earth in a black shirt on a sunny day.
According to White, technologies fuel efficiency has been improved in the area of high technology diesel engines, blended vehicles, rechargeable electric vehicles, plug-in hybrid electric vehicles ...
For jet aircraft operating in the stratosphere (altitude approximately between 11 and 20 km), the speed of sound is approximately constant, hence flying at a fixed angle of attack and constant Mach number requires the aircraft to climb (as weight decreases due to fuel burn), without changing the value of the local speed of sound.