What is Jet: Definition and 327 Discussions

Jet fuel or aviation turbine fuel (ATF, also abbreviated avtur) is a type of aviation fuel designed for use in aircraft powered by gas-turbine engines. It is colorless to straw-colored in appearance. The most commonly used fuels for commercial aviation are Jet A and Jet A-1, which are produced to a standardized international specification. The only other jet fuel commonly used in civilian turbine-engine powered aviation is Jet B, which is used for its enhanced cold-weather performance.
Jet fuel is a mixture of a variety of hydrocarbons. Because the exact composition of jet fuel varies widely based on petroleum source, it is impossible to define jet fuel as a ratio of specific hydrocarbons. Jet fuel is therefore defined as a performance specification rather than a chemical compound. Furthermore, the range of molecular mass between hydrocarbons (or different carbon numbers) is defined by the requirements for the product, such as the freezing point or smoke point. Kerosene-type jet fuel (including Jet A and Jet A-1, JP-5, and JP-8) has a carbon number distribution between about 8 and 16 (carbon atoms per molecule); wide-cut or naphtha-type jet fuel (including Jet B and JP-4), between about 5 and 15.

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  1. Pengwuino

    Music Jet li + asian music video = bad american music^2

    http://www.youtube.com/w/Fearless-MV?v=fp2atxNeVDU&search=jet%20li This is a nice video for jet li fans... but its also, for me, says something about American music lately. For most of the music video... if i didn't see the chinese (or whatever) captions at the bottom, i really wouldn't have...
  2. O

    Bullets from a Jet Fighter Mach 3.2

    :confused: A gentlemen on another site, not related to physics stated the following: [moderator removed personal information of third: indeed something that is inappropriate without consent] Bullet speed is relative. A .22 long rifle compared to the .22-250 is a great example. The SR-71...
  3. F

    Medical How Can Living Brain Cells Control a Fighter Jet?

    https://www.physicsforums.com/newthread.php?do=newthread&f=149 my blog post about this: http://maskedslacker.blogspot.com/
  4. K

    Can a Jet Engine Work Without Air?

    OK I have question about the way jet engine works. I am only 16 and haven't got into any of this stuff in hs yet. my buddy and I were having a disscusion about the way a jet and rockets work and got stump by something. I looked up online how they both work and heard of people refferring to a...
  5. Q

    Why does a jet look like this when it breaks the sound barrier?

    This pic is really cool, it looksl ike a cloud. I'm only 17, so don't know much physics, i hope someone can explain this in an easier way. Why does it look like a cloud
  6. edward

    News Jet Blue Maintenance Outsourced to El Salvador

    Jet Blue is outsourcing maintenance to El Salvador 145 People traveling on Jet Blue can thank a skilled pilot for avoiding what could have been a tragedy yesterday. Jet Blue is one of the airlines which out sources the maintenance of its planes to unlicensed mechanics in El Salvador...
  7. K

    What prevents jet fighter pilots from blacking out

    Hi guys! I need your help on the following: 1. what is the formula in getting horizontal and vertical component - force and angle? 2. What remedial emeasures are taken by technicians and scientist to prevent jet fighter pilots from blacking out or experiencing red-outs due to high turns?
  8. S

    Building a Small Jet Engine: Experiences & Parts

    Has anyone here ever built a small Jet engine? Just generally interested in how you did it and from what parts thanks
  9. Integral

    What to do with a used helicopter jet engine?

    For those with a strong death wish only.
  10. T

    Why Jet Planes' Tails Are Not Always Visible

    Hi, Sometimes when a jet plane is flying above you you can see the white tail from the motors, and sometimes not. What is the reason for this? Why isn´t this visible all the time? regards t.
  11. A

    Jet Engine Intakes: Why the Squashed, Flat Design?

    I half remember that jet engine intakes were circular a few years ago. Now they have a squashed appearance with the bottom part quite flat. This isn't new as the first German jet at the end of World War II had the same shape but it seems relatively new on airline jet engines. So, why are...
  12. C

    Twin engine jet airplane lands

    Finally, your friend's twin engine jet airplane lands. As it stands on the runway, you hear the sound of the engines getting louder and softer, rhythmically once every two seconds. The average frequency you hear is 4100 Hz. What is the difference between the individual frequencies of the sounds...
  13. S

    Hot Air in Jet Engines: Fuel Burn and CO2 Formation

    When fuel is burnt in the jet engine, what is the major component of the hot gases thrown out of the back - the CO2 formed (I know CO2 is not the only component but it is the major one) from the fuel or the air entering the jet as a whole? In other words, does the heat of the burning fuel...
  14. S

    How do you design a flame holder for a jet engine?

    I don't quite understand how it is supposed to work. How do you determine what the flame holder is supposed to look like ,where to put the holes, and how big the holes should be? What are the physics and equations for it?
  15. S

    Top Jet Propulsion Books for Gas Turbines and Jet Propulsion

    Does anyone know of some decent books for Gas Turbines/ Jet Propulsion? Thanks
  16. Y

    Can Jet Engines Run on Hydrogen and Oxygen?

    thinking of a project and was wondering can a jet engine be modified to run on just hydrogen and oxygen as the fuel, or is it too explosive? if not can a pulse jet?
  17. H

    Calculating Minimum Turn Radius for 200 m/s Jet

    A review question for the test our teacher is going to give us is: A 21,000 kg jet makes a 40 deg banked turn w/o losing altitude. Assume the life vector is perpendicular to the plane of the wings. What is the minimum radius turn it can execute at a speed of 200. m/s? Any help appreciated.
  18. E

    Fighter aircrafts have the jet engines buried inside the fuselage

    Unlike commercial airplane, many fighter aircrafts have the jet engines buried inside the fuselage instead of in pods hung beneath the wings. Do you know why?
  19. P

    Calculating Jet Engine Output of an Airplane

    The jet engine of an airplane takes in 100 kg of air per second, which is burned with 4.2 kg of fuel per second. The burned gases leave the plane at a speed of 550 m/s (relative to the plane). If the plane is traveling 270 m/s. (a) Determine the thrust due to ejected fuel. This...
  20. Clausius2

    Revolutionizing Jet Engine Design: A New Idea to Increase Efficiency?

    What do you think of this?. I was a brainwave when I sat on the toilet :smile: . A typical jet engine compresses the air when it comes into the compressor, burns it with fuel, and expands it in the turbine. Approximating there is no difference of static pressure between the entrance and the...
  21. C

    Jet Engines: Momentum, Pressure and Thrust

    I am just about to start my Aero. Eng. degree in a few days time and am currently ploughing my way through all the reccommended reading. A lot of it either gives textual explanations (rather than mathematical proofs or both) or gives a brief description, glossing over anything that may be...
  22. wolram

    Pulse Jet Go-Kart Plans: 80-100lbs Thrust Gas Fuel

    Can anyone tell me where i might find plans for a valve less pulse jet engine, with a thrust of about 80 to 100lbs, i want to use it to power a novel gocart. i want to use gas as the fuel if possible.
  23. K

    Air resistance and jet engines

    When a jet aircraft is flying at high speed doesn't the air impacting on the front of the engines compress the air before it gets into the compressor. And how fast does the combusted fuel leave an engine compared to the speed of airflow at the intake?
  24. FZ+

    Can the noise level of jet engines be reduced?

    A number of deceptively simple, but hopefully interesting questions. 1. Why are jet engines so noisy? 2. Is there a way to make them quieter, or otherwise register less on the human ear?
  25. N

    Noise reduction in a jet engine

    I am in the process of writing a report on the Physics of Jet engines and I have come across a problem I cannot comprehend. In the exhaust of many jet engines they allow the atmospheric air to mix with the air from the engine to reduce exhaust noise. From what I understand this allows the...
  26. M

    A jet transport has a weight of 2.97 x 106 N and is at rest on the runway

    I have two problems for homework that I just can't seem to figure out. Can someone please help me?! Thanks. 1) A jet transport has a weight of 2.97 x 106 N and is at rest on the runway. The two rear wheels are 17 m behind the front wheel, and the plane's center of gravity is 13.1 m behind the...
  27. H

    Current theorys in fluid dynamics for jet propulsion

    anyone know any theories being used for fluid dynamics? any formulas? I aint no physicist, I am just curious. Are there any developments today involving jet propulsion by going faster with only half the fuel? if that sounds right. any help would be appreciated
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