What's
in the exhaust of alternative jet fuels is a must-know to be sure it
would actually be better than what aircraft use today.
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Puffy
white exhaust contrails stream from the engines of NASA's DC-8 flying
laboratory in this photo taken from an HU-25 Falcon flying in trail
about 300 feet behind.
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| A heavily instrumented HU-25 Falcon measures chemical components from the larger DC-8's exhaust generated by a 50/50 mix of conventional JP8 and a plant-derived biofuel. |
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The "sniffer" plane – the HU-25 Guardian, or "Falcon" – is based at NASA's Langley Research Center.
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The
modified HU-25 Falcon probes the exhaust contrails from NASA's DC-8
flying laboratory as both aircraft enter a turn at about 35,000 feet
altitude during the first data-collection flight in restricted test
airspace over California's high desert.
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During an early test flight, researchers in the HU-25 had this view of the exhaust plume from 15 kilometers behind the DC-8.
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