Comments on: Persisting and Spreading Contrails http://contrailscience.com/persisting-and-spreading-contrails/ The Science and Pseudoscience of Contrails and Chemtrails Thu, 17 May 2012 02:26:36 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Uncinus http://contrailscience.com/persisting-and-spreading-contrails/comment-page-7/#comment-134534 Uncinus Tue, 27 Mar 2012 14:20:57 +0000 http://contrailscience.com/?p=12#comment-134534 Jay, of course the bottom line though is passenger miles per gallon, which has increased significantly. If a new engine is giving the same amount of thrust for half the fuel, then it can hardly be producing more water. I've not seen any firm figures, but it does not seem like the completeness of combustion is a major factor in contrail formation. Engine emissions now have the incomplete combustion components at <1% of the CO2/H2O. I admit though that the various uses of "efficiency" are rather confusing. It would be good to get a definitive write-up. Jay, of course the bottom line though is passenger miles per gallon, which has increased significantly. If a new engine is giving the same amount of thrust for half the fuel, then it can hardly be producing more water.

I’ve not seen any firm figures, but it does not seem like the completeness of combustion is a major factor in contrail formation. Engine emissions now have the incomplete combustion components at <1% of the CO2/H2O.

I admit though that the various uses of “efficiency” are rather confusing. It would be good to get a definitive write-up.

]]> By: Jay Reynolds http://contrailscience.com/persisting-and-spreading-contrails/comment-page-7/#comment-134500 Jay Reynolds Tue, 27 Mar 2012 11:34:38 +0000 http://contrailscience.com/?p=12#comment-134500 Mick, the concepts as related by Chris are considerably more complicated. There are several types of efficiency, Thermal efficiency, specific fuel efficiency, and several more. Full combustion of kerosene is not accomplished in a barrel as Chris stated, full combustion as described by the ideal stoichiometric chemical equation yielding the maximum water, has come closer to being achievd over the years by higher compression ratios and higher burner temps and other means. Further improvements will be harder to reach as we approach material limits, unless we come up with better materials! I don't have enough time or space to fully discuss this at the moment, but will try later. This discusses some of the issues: http://www.ipcc.ch/ipccreports/sres/aviation/index.php?idp=95 Mick, the concepts as related by Chris are considerably more complicated. There are several types of efficiency, Thermal efficiency, specific fuel efficiency, and several more. Full combustion of kerosene is not accomplished in a barrel as Chris stated, full combustion as described by the ideal stoichiometric chemical equation yielding the maximum water, has come closer to being achievd over the years by higher compression ratios and higher burner temps and other means. Further improvements will be harder to reach as we approach material limits, unless we come up with better materials!

I don’t have enough time or space to fully discuss this at the moment, but will try later.

This discusses some of the issues:
http://www.ipcc.ch/ipccreports/sres/aviation/index.php?idp=95

]]> By: Uncinus http://contrailscience.com/persisting-and-spreading-contrails/comment-page-7/#comment-133900 Uncinus Sat, 24 Mar 2012 23:28:14 +0000 http://contrailscience.com/?p=12#comment-133900 Thank you EquinoxMoon, I appreciate that. Thank you EquinoxMoon, I appreciate that.

]]> By: EquinoxMoon http://contrailscience.com/persisting-and-spreading-contrails/comment-page-7/#comment-133898 EquinoxMoon Sat, 24 Mar 2012 23:23:36 +0000 http://contrailscience.com/?p=12#comment-133898 Uncinus, I have found your site helpful and informative. I remember as a child in Minnesota looking up at the contrails in the clear blue sky and marveling that they stayed so very long. I remember asking my parents what they were and being told that it was water vapor from the commercial airplanes that I could see flying at the head of the white line in the sky. Uncinus, I'm 50 years old and I'm talking about things I remember from when I was less then 10. That's 40 years of seeing CONtrails in the sky. These conspiracy folks have short memories, don't they? Kudos to you for quietly and consistently answering raving "sky is falling" conspiracists with cold hard scientific fact and logic. You have more patience than I, since I was only able to get through a couple of pages of their diatribe in your comments. Uncinus,
I have found your site helpful and informative. I remember as a child in Minnesota looking up at the contrails in the clear blue sky and marveling that they stayed so very long. I remember asking my parents what they were and being told that it was water vapor from the commercial airplanes that I could see flying at the head of the white line in the sky. Uncinus, I’m 50 years old and I’m talking about things I remember from when I was less then 10. That’s 40 years of seeing CONtrails in the sky. These conspiracy folks have short memories, don’t they?

Kudos to you for quietly and consistently answering raving “sky is falling” conspiracists with cold hard scientific fact and logic. You have more patience than I, since I was only able to get through a couple of pages of their diatribe in your comments.

]]> By: Uncinus http://contrailscience.com/persisting-and-spreading-contrails/comment-page-7/#comment-124671 Uncinus Sat, 25 Feb 2012 20:24:32 +0000 http://contrailscience.com/?p=12#comment-124671 Thanks Chris, I'll update the post. I wrote this particular post quite a long time ago, and was not that familiar with the material. I thought at the time that it was simply burning more completely. If anything, a more efficient engine will produce LESS water, as it burns less fuel. Thanks Chris, I’ll update the post.

I wrote this particular post quite a long time ago, and was not that familiar with the material. I thought at the time that it was simply burning more completely.

If anything, a more efficient engine will produce LESS water, as it burns less fuel.

]]>