allardjd 1,853 Posted October 23, 2007 Report Share Posted October 23, 2007 Link to post Share on other sites
MartinW 0 Posted October 29, 2007 Report Share Posted October 29, 2007 Yes John I do, eardrum burstingly loud. Now explain the interesting ectoplasm effect. :???: I read about the effect some time ago, remind us... if you can. :mrhappy: Link to post Share on other sites
allardjd 1,853 Posted October 30, 2007 Author Report Share Posted October 30, 2007 Just speculating here... I think it's from global warming.... :???: No, just kidding! :mrhappy: Because of the blast shields visible behind the AC, I believe this might have been a full-power run-up. In flight, there is a ram air effect resulting from the airspeed forcing air into the engine inlet, keeping the pressure in that area relatively high, or at least keeping if from becoming very low. At zero airspeed, the engine compressor is sucking the air in, no doubt producing a pronounced low pressure, high velocity area just ahead of the compressor stages. Adiabatic cooling occurs because the air is trying to expand as it passes through that zone of reduced pressure. (You know the drill - if you compress a gas it becomes warmer, if you let it expand it becomes cooler) If the temperature and humidity conditions are right (i.e. temperature and dewpoint are close together), condensation results. That's my story until I hear a better one. Link to post Share on other sites
MartinW 0 Posted October 30, 2007 Report Share Posted October 30, 2007 I think it's from global warming.... :sadblinky: Curse that global warming. I knew all you non-believers should have listened to me. :???: Actually, I read about this a few months ago in New Scientist, can't remember the explanation in detail, but it was similar to your hypothesis. Personally I still think it's an entity from the spirit world, or perhaps one of the passengers was a medium and had just exuded a stream of ectoplasm. If we had hung around a bit longer it would almost certainly have transformed into an ethereal form. Or even an alien. :giggle: P.S. ‘Adiabatic cooling’… I like it. Respect! :mrhappy: Link to post Share on other sites
Kokoro 0 Posted November 30, 2007 Report Share Posted November 30, 2007 The picture looks as if it was taken in the engine run pen at Cardiff http://kokorolibrary.net/photography/showpic_451.php Link to post Share on other sites
mutley 4,498 Posted November 30, 2007 Report Share Posted November 30, 2007 Wow it sure does and you almost got a picture of it too! (Note to self, need to look at kokoro's latest pics :mrhappy: ) Cheers Link to post Share on other sites
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