What is being sprayed by planes in the sky?The stuff looks different to contrails and spread over a large area

Question

you can often see the difference from ordinary contrails. some days i see a clear blue sky slowly get obscured by these planes spraying out clouds of WHAT?. sometimes every cloud in the sky is this plane spew no natural cloud just obscuring the whole blue sky to a hazy sky. What is it and why is noone telling us what it is? or even that it is being done. I see this quite regularly as i work outside most of the time, others must have noticed this going on in the sky.

Answer 1

Pesticides?

Answer 2

Planes high up in the sky do not spray out anything at all. It is the heat from the engines mixing with the cold air that causes contrails and it will change in form and shape depending on the wind speed in the sky.
The only time that planes do spay something, is when they are close to landing and when they cross Hounslow and get rid of fuel. If you live under a flight path and in Hounslow, you can clearly see the fuel spillage.

Answer 3

Hi Mark

As far as I know the trails are either there or not according to the concentration of moisture in the air at the time, eg: dry sunny days, no trail, Autumn or days preceding; and after rain,you have trails. Its the heat of the exhaust from the engines reacting with the moisture in the air. So it stands to reason that on hazy days, you will have hazy trails. Sometimes planes have to dump fuel if they are coming in too heavy, but they normally do this over the sea. Hope this helps.

Answer 4

I like to see the Contrails from the Planes,but never think about being on them.

Answer 5

it's either fuel, or the condensation of water vapor from the jets at that high altitude. like a car has an exhaust everyone can see that on a cold day. if the plane is high up it's going to be cold
hence the vapor trails

Answer 6

Most likely, if not condensation from the contrails, then it is excess fuel being dumped, or waste water from the toilet systems. Both actions are illegal over UK land, and should be done over the sea.

If this is happening alot, then report it.

Answer 7

Contrails are condensation trails (sometimes vapour trails): artificial cirrus clouds made by the exhaust of aircraft engines or wingtip vortices which precipitate a stream of tiny ice crystals in moist, frigid upper air. Contrary to appearances, they are not air pollution as such, though might be considered visual pollution.

Condensation from engine exhaust:
An aircraft engine's exhaust increases the amount of moisture in the air, which can push the water content of the air past saturation point. This causes condensation to occur, and the contrail to form.
Aviation fuel such as petrol/gasoline (piston engines) or paraffin/kerosene (jet engines) consists primarily of hydrocarbons. When the fuel is burned, the carbon combines with oxygen to form carbon dioxide; the hydrogen also combines with oxygen to form water, which emerges as steam in the exhaust. For every gallon of fuel burned, approximately one gallon of water is produced, in addition to the water already present as humidity in the air used to burn the fuel. At high altitudes this water vapour emerges into a cold environment, (as altitude increases, the atmospheric temperature drops) and the local increase in water vapour density condenses into tiny water droplets and/or desublimates into ice. These millions of tiny water droplets and/or ice crystals form the contrails. The energy drop (and therefore, time and distance) the vapour needs to condense accounts for the contrail forming some way behind the aircraft's engines. The majority of the cloud content comes from water trapped in the surrounding air. At high altitudes, supercooled water vapour requires a trigger to encourage desublimation. The exhaust particles in the aircraft's exhaust act as this trigger, causing the trapped vapor to rapidly turn to ice crystals. Contrails will only occur when the outside air temperature around the aircraft is at or below -57 degrees Celsius.

Condensation from wing-tip pressure:
The wings of an airplane cause a drop in air pressure in the vicinity of the wing (this is partly what enables a plane to fly). This drop in air pressure brings with it a drop in temperature, which can cause water to condense out of the air and form a contrail but only at higher altitudes. At lower altitudes, this phenomenon is also known as "ectoplasm." Ectoplasm is more commonly seen during high energy manouvers like those of a fighter jet, or on jet liners during takeoff and landing, at areas of very low pressure, including over the wings, and often around turbo-fan intakes on takeoff.

Answer 8

If you look up Geoenginerering you'll find out what is happening in our skies. These fake clouds aren't natural vapor or fuel. What you find may shock you.

Answer 9

spf 5000

Answer 10

aviation fuel i live near flight path and always get sticky residue on windows and car.