Does that guy even know what a contrail is? Any airplane can make them if they are high enough because one of the products of combustion is water. Combust any basic organic compund like methane, ethane, propane, pentane, butane, octane, nonane, or decane(to name several) with oxygen and the products are always carbon dioxide and water: C3H8(propane)+5O2(oxygen)->4H2O(water(vapor))+3CO2(carbon dioxide) It is a little more complicated with aviation fuel but that is the basic principle. The water vapor simply condenses when it hits the cold air at high altitudes. Another thing, that guy should get his camera cleaned. He could be a good artist if he could focus his creative powers on something useful. Let me leave you with this: If the Russians can control the weather, why isn't their weather better and ours worse?

Message edited on: 02/03/2005 01:06