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originally posted by: F4guy
The Air Combat Command West A-10 Demonstration Team operates out of Davis Monthan AFB in Tucson, AZ. These demo teams are set up with smoke systems where a paraffin based oil is injected into the engines which produces a lot of smoke in the exhaust. They are not "spraying" anything out of nozzles but when the smoke system is toggled on, it might look like it. And the tanks on an a-10 are pretty small compared to an airliner. The hog carries 11,000 pounds compared to the 747's 400,000.
originally posted by: vethumanbeing
a reply to: Rob48
JP5? diesel? JP4 was too flammable; could be diesel fuel, except only turbo props fly with that mixture. So, where is the die put, in F16,18 fuel tanks? that's just crazy talk.
How are the coloured vapour trails made?
The vapour trails begin life as diesel fuel, contained in an extra fuel tank bolted on the underside of the Hawk fuselage. At the rear of the aircraft, immediately above the jet exhaust pipe, there are three small tubes through which the pilot can pump small quantities of this diesel. When the diesel meets the extremely high temperatures found in the jet exhaust (over 500 degrees Celsius), the diesel immediately vaporises creating an intense white cloud. With separate switches on his control column, the pilot can add red or blue dye to the diesel and produce the other two colours. During a 30-minute sortie each aircraft can produce vapour for a maximum duration of seven minutes.
originally posted by: Zaphod58
a reply to: vethumanbeing
The US teams use white smoke only. They remove the gun and put a small tank there. It provides ballast, to balance the weight of the gun, as well as creating the smoke trail.
originally posted by: vethumanbeing
a reply to: DenyObfuscation
I have many relatives that live in Tucson that I visit regularly (I lived in Tucson for many years as well). So, I notice odd contrail patterns that shouldn't be there;
originally posted by: Aloysius the Gaul
originally posted by: vethumanbeing
a reply to: DenyObfuscation
I have many relatives that live in Tucson that I visit regularly (I lived in Tucson for many years as well). So, I notice odd contrail patterns that shouldn't be there;
What contrail patterns should not be there??
originally posted by: vethumanbeing
a reply to: Box of Rain
There is the small problem of tight grids being made in my area, (perfect square/rectangles) these are no where near any type of logical air traffic patterning (contrails). I know where those are, the direction of those jets at speed at 35,000 foot altitude 500 mph.
originally posted by: vethumanbeing
originally posted by: Aloysius the Gaul
What contrail patterns should not be there??
The ones that resemble Mickey Mouse Heads, Big yellow Smiley Faces "Have a Nice Day"; or Perfectly formed SNOWFLAKES.
originally posted by: Aloysius the Gaul
originally posted by: vethumanbeing
a reply to: Box of Rain
There is the small problem of tight grids being made in my area, (perfect square/rectangles) these are no where near any type of logical air traffic patterning (contrails). I know where those are, the direction of those jets at speed at 35,000 foot altitude 500 mph.
"logical air traffic patterning"??
Why don't you mention us the ACTUAL air traffic patterns in your area?
Here's what a traffic chart looks like for a relatively isolated city in the south Pacific -
You can download the hi-level FAA charts from here - perhaps you could find the one overhead where you are, and post it here so people who actually read these things for a living can tell you what it means.
originally posted by: Aloysius the Gaul
originally posted by: vethumanbeing
originally posted by: Aloysius the Gaul
What contrail patterns should not be there??
The ones that resemble Mickey Mouse Heads, Big yellow Smiley Faces "Have a Nice Day"; or Perfectly formed SNOWFLAKES.
why shouldn't they be there??
originally posted by: vethumanbeing
tight grids being made in my area, (perfect square/rectangles) these are no where near any type of logical air traffic patterning....These are tight checkerboard patterns; and when the turn loops are made, no expellant; only when placing the straight grid lines does the plume appear.
originally posted by: NoRulesAllowed
Since (as some said) contrails are only occurring at cruise altitude, "the weather" of course becomes entirely irrelevant since there is no "weather" at 32,000 - 35,000 ft. You are far high above any clouds & weather at those heights.
Night clouds or noctilucent clouds are tenuous cloud-like phenomena that are the "ragged edge" of a much brighter and pervasive polar cloud layer called polar mesospheric clouds in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice.
They are the highest clouds in Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres
originally posted by: NoRulesAllowed
Since (as some said) contrails are only occurring at cruise altitude, "the weather" of course becomes entirely irrelevant since there is no "weather" at 32,000 - 35,000 ft. You are far high above any clouds & weather at those heights.