back to article NASA and Boeing try to chase the contrail clouds away

NASA is studying contrails to determine if more environmentally friendly aircraft fuels might reduce their formation. Contrails are lines of clouds left by high-flying aircraft formed when water vapor in engine exhaust condenses and freezes. The clouds themselves are made up of ice particles and some scientists worry that a …

  1. PB90210 Bronze badge

    Won't someone think of the poor foil-hatters!

    What will they have to live for... except the lizard people... oh, and vaccines... and the election... and......

    1. Anonymous Coward
      Anonymous Coward

      HAARP, MK Ultra, cheese pizza, wayfair catalogues, Davos, WEF, fluoride in the water, flat earth... its a LONG list :)

      But this just convinces us that they ARE up to something with the chemtrails. They are just trying to hide it.


      1. Aladdin Sane

        Obligatory xkcd.

      2. Anonymous Coward
        Anonymous Coward

        SMART meters, 5G the list goes on and on and on

      3. AnonEMusk Noel

        Flat, hollow earth*

      4. Nick Ryan Silver badge

        Don't forget creationists and mud flooders too.

        Oh, and some people who are so batshit insane that they think there is a parallel solar system in our solar system. Saw a "review" of one of these and it was 100% nut job material making numerology look rational.

    2. DS999 Silver badge
      Black Helicopters

      Don't take away my chemtrails!

      Since they didn't communicate with Bill Gates in advance it turns out the chemtrails deactivate the 5G chips in our bloodstream. If there are no more chemtrails then those 5G chips go active and ... well I'm not sure what happens but I'm sure it isn't good and will make Bill Gates even richer!

      1. Yet Another Anonymous coward Silver badge

        Re: Don't take away my chemtrails!

        But they're being replaced by invisible stealth chemtrails which activate the secret 6G virus transmitter

        You've not heard of 6G? That proves there's a cover up!

        1. Nick Ryan Silver badge

          Re: Don't take away my chemtrails!

          Seeing as "6" is the number of the beast and the word for "6" has three letters in it, this makes the expansion of it 666G. We all know that that means don't we? It's simple, sheeples, G is the 7th letter of the alphabet meaning that the real plan will be executed with the turn on of global/flerfal 7G technology. 6G is our last chance. All poles having HD 6G wires attached to them must be immediately burnt down. Especially if these poles are attached to each other in any way, forming a network of control and manipulation.

  2. Eclectic Man Silver badge

    Vapour trails

    They may be able to reduce the particulate emissions from powered aircraft, but gliders (sailplanes in the USA) can also produce vapour trails in flight. Just google "Glider creating vapour trail' for some photographic evidence.

    Still, reducing high altitude pollution has got to be a good thing.

    1. Zolko Silver badge

      Re: Vapour trails

      Those chemtrails by gliders are due to them releasing water ballast before landing. They're plain liquid water, neither vapor nor ice.

      1. Eclectic Man Silver badge

        Re: Vapour trails

        I have been in several glider flights where despite there being no ballast wing-tip vortices created short vapour trails ands seen them created by acrobatic glider manoeuvres without the release of ballast.

        1. Michael Wojcik Silver badge

          Re: Vapour trails

          Certainly the area of lower pressure created over the airfoil could cause moisture vapor to condense. That's a plausible mechanism.

          But with jet aircraft you also have additional vapor as a combustion product, and other exhaust components as nucleation sites. IANAC, but it seems to me that there's potential (in theory) for reducing contrails formed by jets, even if you can't eliminate them entirely.

    2. LogicGate Silver badge

      Re: Vapour trails

      Sorry, but no.

      Gliders can create something that looks like a vapour trail when dumping waterballast, but this is very temporary, and the mechanism is quite different.

      If the water content in the atmosphere is very high, then low pressure areas over a wing surface or at the tips of wings and propellers can trigger to vapour (see fighter jets flying transonic inside a lens shaped cloud), but this will dissapate again almost immediately once ambient pressure is restored.

      Gliders have such low wing loadings (currently up to approximately max. 60 kg / m^2), that you must be very lucky to see under-pressure triggered vapour trails example: .

      Vapour trails from airliners are completely different beasts. Jet engines burn hydrocarbons. The carbon part combines with atmospheric oxygen to create CO2. The Hydrogen part combines with atmospheric oxygen to create water steam. This steam is then rolled up into the trailing wingtip vortices and, if the atmospheric conditions are right, condensates into a linear cloud that can last for quite some time.

      Soot particles from un-clean combustion may also help in the process. IIRC, running the combustion hotter may reduce soot, but increase NOX formation.

      Replacing hydrocarbons with hydrogen will remove CO2 and soot, but the other issues remain.

      1. Claptrap314 Silver badge

        Re: Vapour trails

        I grew up in the middle of Western Kansas--the very definition of fly-over country. Contrails behind jets can disappear in several jet-lengths, in several seconds, in several minutes, in a few hours, or... and this is NOT particularly rare, grow until the merge with others and keep growing.

        Once the turbulence dies down, they are EXACTLY the same as any other cloud, and if the local atmosphere is supersaturated, they will grow to the limits of the supersaturation.

      2. druck Silver badge

        Re: Vapour trails

        This steam is then rolled up into the trailing wingtip vortices

        The contrails get nowhere near the wingtip vortices, you can quite clearly seem them start a short distance behind the engines, with 4 engined planes producing 4 of them, although the pairs quickly merge.

  3. Marty McFly Silver badge


    >"Contrails are lines of clouds left by high-flying aircraft formed when water vapor in engine exhaust condenses and freezes. The clouds themselves are made up of ice particles

    >"Contrails are believed to be a major source of pollution,"

    So water, in the sky = pollution.

    Oh, drat! I just started raining. Now the pollution is everywhere!

    {C3PO voice} "We're dooooomed!"

    1. Trigonoceps occipitalis

      Re: Pollution

      Stuff C3PO - Private James Frazer

    2. Anonymous Coward
      Anonymous Coward

      Re: Pollution

      Its worse than that. When ships stopped sailng the ocean blue, becuase demand dried up during 2020-2021, the air cleared and more energy was absorbed by the oceans, raising the surface temperature more than expected, and more than predicted.

      1. Neil Barnes Silver badge

        Re: Pollution

        Wasn't there also a noticeable temperature change when commercial aircraft were severely curtailed after 9/11? IIRC the temperature went up, again because contrails stopped reflecting.

  4. davebarnes

    I remember when 90% of the multi-engine vapor trails were from B-52 bombers. Always exciting.

  5. Captain Boing

    jeez, make your minds up!

    so on the one hand we have Billy-boy wanting to spray stuff in the air or space a huge tin foil umbrella to block out the sun, then we have this lot trying to reduce sun-blocking steam made my jet engines...

    Is the idiocy of this BS starting to sink in yet?

  6. wiltshirejohn

    What's in a name ?

    "Contrail" - such a nice innocent sounding word. Try using the real term "AEROPLANE FART".

  7. adam 40 Silver badge

    There's already been a mass contrail experiment

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