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Author Topic: Aviation  (Read 4118 times)

Hefaistos

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Re: Aviation
« Reply #50 on: March 17, 2017, 07:56:49 PM »

A new study from NASA has shown that the jet engines using biofuels have fewer particle emissions in their exhaust trails.
"As a result, the observed particle reductions we've measured during ACCESS should directly translate into reduced ice crystal concentrations in contrails, which in turn should help minimize their impact on Earth's environment,"
http://www.cnbc.com/2017/03/17/biofuels-cut-jet-engine-pollution-nasa-study-shows.html

I believe that aviation over the Arctic ocean contributes to the creation of polar stratospheric clouds. These contribute to the warming over the Arctic, according to a research paper previously reported on the forum.
Scientists recently discovered that polar stratospheric clouds, long known to play an important role in Antarctic ozone destruction, are occurring with increasing frequency in the Arctic. The PSCs have been frequently seen in northern parts of Scandinavia during this winter, according to various reports.
http://earthsky.org/earth/wow-polar-stratospheric-clouds


Hefaistos

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Re: Aviation
« Reply #51 on: March 17, 2017, 08:07:51 PM »
More reports on PSCs

http://spaceweather.com/archive.php?view=1&day=14&month=02&year=2017

What else could cause the growth in PSCs than intercontinental aviation?
Modern planes like the Dreamliner cruise at very high altitudes, like 36 000 feet, well into the stratosphere.
Intercontinental aviation across the Arctic  has increased  quite a bit in recent years, with budget airlines like Virgin or Norwegian. Most flights from Europe to the US pass Greenland and Newfoundland, e.g. And dominating wind patterns will blow the contrail clouds further NE.


Sigmetnow

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Re: Aviation
« Reply #52 on: March 22, 2017, 04:48:09 PM »
Battery energy density is not yet where we need it to be, but given the curve of battery improvement, this is a noteworthy goal.

A new startup is trying the more ambitious goal of building a battery-powered 150-seat plane to compete with 737-size aircrafts in the market for short-haul trips (under 300 miles).
https://electrek.co/2017/03/22/electric-plane-startup-150-seat-battery-powered-plane/
People who say it cannot be done should not interrupt those who are doing it.

mati

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Re: Aviation
« Reply #53 on: March 22, 2017, 10:44:38 PM »
better yet to build an electric catapault and fire a glider to land in france :)
and so it goes