| Contrails | Precipitation cloud? No |
|---|
Why do military jets not leave contrails?
Why do some jets not leave contrails? Contrails form when jet exhaust emits water vapor that condenses and freezes.
Contrails don’t form for every airplane
. The atmosphere where the plane is flying needs to have low vapor pressure and low temperature.
Do fighter jets leave contrails?
Jets leave white trails
, or contrails, in their wakes for the same reason you can sometimes see your breath. … The water vapor contained in the jet exhaust condenses and may freeze, and this mixing process forms a cloud very similar to the one your hot breath makes on a cold day.
Do propeller planes leave contrails?
Contrails become visible roughly about a wingspan distance behind the aircraft.
Contrails can be formed by propeller
or jet turbine
Do planes dump fuel before landing?
Usually, airplanes won’t dump fuel in mid-air or when taking off or landing;
they only do so immediately before they land the plane
.
Why do jets fly so high?
Why Do Commerical Aircraft Fly So High? The reason aeroplanes fly so high is
due to improved fuel efficiency
. A jet engine operates more efficiently at higher altitude where the air is much thinner, allowing an aircraft to travel faster whilst at the same time, burning less fuel.
How long does it take for contrails to dissipate?
If the humidity is low and the temperature is not cold enough (above -40 degrees Fahrenheit) contrails will dissipate quickly. However, if the air is moist and the temperature is -40oF or below, then a contrail will “persist” for
as long as 30 minutes to an hour
.
Why do Jets leave a white trail in the sky?
These clouds are contrails, short for condensation trails. Water vapor is one of the byproducts of jet
fuel combustion and will turn into ice crystals in the cold air
at the high elevations where jet airplanes fly. Those ice crystals create a cloud (the contrail), which does not pose any public health risk.
Why do planes dump fuel?
The reason to dump fuel is simple:
to drop weight
. Any given aircraft has a Maximum Landing Weight (MLW) at which it can land, and in most cases that weight is lower than its Maximum Takeoff Weight (MTOW).
Do planes dump poop?
Airlines are not allowed to dump their waste tanks
in mid-flight, and pilots have no mechanism by which to do so; however, leaks sometimes do occur from a planes septic tank.
Can a plane have too much fuel?
A
heavier plane
is more likely to hit the ground hard and get damaged. … So that enough fuel gets burned off over the course of the flight and the plane’s weight comes down and then it’s safe to land. A pilot will choose to dump fuel only on very rare occasions.
How much fuel does a 747 burn on takeoff?
According to the Boeing website, the 747 burns approximately
12 litres per kilometre
. 747 can carry as many as 568 people. It can carry up to 238,840 litres of fuel.
How cold is it at 35000 feet?
How cold is it up there? The higher you get, the colder it gets, up until 40,000 feet. If the temperature at ground level was 20C, at 40,000 feet it would be -57C. At 35,000 feet the air temperature is
about -54C
.
Do pilots sleep while flying?
Do pilots sleep on their job?
Yes, they do
. And however alarming it may seem, they are actually encouraged to do so. It’s good to take a short nap during flights, but there are strict rules that control this practice.
Why do jets fly at 35000 feet?
A balance between operating costs and fuel efficiency
is achieved somewhere around 35,000 feet, which is why commercial airplanes usually fly at that altitude. Most commercial airplanes cruise at an altitude of nearly 35,000 feet—around 6.62 miles (10,600 meters) in the air!
What causes contrails to linger?
If the humidity is high (greater than that needed for ice conden
