y some jets leave smoke trail while commercial planes dont?

Answer 1

the Military B-52 produces a lot of black smoke when taking off this is due I believe to the introduction of water injection into the engines to aid in the increase in take off thrust.
commercial jets are subject to civilian noise and power restrictions as well a pollutant restrictions Military aircraft are not bound by these regulations due to the nature of their business

Answer 2

Commercial Jets "do" leave contrails when conditions are right. These depends on altitude and humidity and temperature to form. Many of the "fighter" jets fly at different altitudes from commercial passenger jets and are more readily seen. When I was living in the desert in California about 140 miles from Los Angeles the air traffic used to fly over my area as well as the 29 Palms military base and essentiall all the aircraft left these when they hit the right altitude. With the sky usually totally clear and blue most of the time there you could see the entire sky criss crossed with these during the day. These trails are not actually smoke, like a regular car, but moisture and vapor trails formed by the hot jet exhaust and cold air at altitude. And the particles of combustion etc. coming out of the engines.

Answer 3

Most of the "smoke trails" that you see are from Commercial Planes. Although its not smoke at all it is actually contrails. This happens when the exhaust from the engines (which is at a very high heat) mixes with the cold air at the high altitudes and forms a cloud like substances that resembles smoke.

Answer 4

Assuming you mean the "contrail" (condensation trail), you should hang out around airports more. Civil and military aircraft leave contrails. Actual smoke comes from a smoke generator. These area frequently found on stunt planes, military and civilian, but not anywhere else typically.

Answer 5

I believe you are asking about when you see a plane and there is a darker trail coming out of the engines, this occurs because of the heat being produced from the burning fuel, the darkness of the smoke is cooler burning, less stuff gets burned and more particle pollutants in the atmosphere, less NOx (not nitrious oxide, one Nitrogen Molecule and unknown oxygen {depends on the amount of heat being produced}). The clearer the exhaust gasses the more NOx and fewer particle pollutants.
Basically it depends on the engine that the aircraft is operating and its fuel mixture.

More fuel (rich)= cooler burn, less NOx, more particulate matter.
Less fuel (lean)=hotter burn more NOx, less particulate matter.

Answer 6

This occurs in many planes including commercial airpliners. it usually occurs around 28000ft but that can differ. It is due to the heat of the exhaust meeting the cool air.

Answer 7

chem trails....I just asked if anyone notices them at all...it's not smoke its chemical trails that the government is spraying us with. Google chemtrails2000 and you will come up with probably more info then you bargained for......it's a little scary when you really think about it, what the government is doing to everyone and no ones seems to care to stop them.....