BryanG From United States of America, joined May 1999, 436 posts, RR: 0
Reply 2, posted (15 years 9 months 2 weeks 4 days 11 hours ago) and read 896 times:
Chemically, kerosene and jet fuel are the same. When they distill petorleum at the refinery, jet fuels are collected just before gasolines. The kerosenes are more dense than gasoline (gasolines have 5-11 carbon atoms per molecule, kerosenes have 9-16 carbon atoms per molecule). The kerosenes have a much higher octane, allowing them to burn slower than gasoline. In the jet engine, the fuel burns to accelerate air out the back and produce thrust. Fast-burning fuels like gasoline would waste most of their energy in the jet, beause they would just vaporize when they were ignited and wouldn't create a lot of force.
Force = mass x acceleration, so if a drop of gas takes longer to burn it has more opportunity to accelerate air throught the jet - the force of the thrust increases. I don't know if a jet can run on regular gasoline or not (I doubt it), but if it could it would basically just burn quickly to produce a lot of heat and noise without moving much air out the back of the engine.
spud From United Kingdom, joined Apr 2011, 0 posts, RR: 0
Reply 4, posted (15 years 9 months 2 weeks 4 days 3 hours ago) and read 894 times:
Turbine fuel and Kero are similar. But kero lacks the additives and purity of Jet. It does not have a higher octane, you cant measure it in that value. You CANNOT use av gas in a turbine. after a very short time you would have a very expensive puddle of metal. But you can use diesel fuel in an emergency at an increased maintance cost and less performance.
L-188 From United States of America, joined Jul 1999, 29832 posts, RR: 58
Reply 7, posted (15 years 9 months 2 weeks 3 days 12 hours ago) and read 894 times:
There are some turbine engines that are specificly designed for AV-Gas. Specificly some of the turbine booster engines that where used on the B-36, C-119, KB-50, C-123, KC-97. Usually these were military aircraft that had high operating weights. The booster turbines on the C-123K are actually the same J-85 that are used of the F-5 fighter. Just a different series number. Most aviation turbines can still use av-gas as long as certain operating peramaters and conditions are met. If you exceed them then you do toast the engine.
All Kerosenes have about the same charicteristics. Doesn't matter if it is Home heating oil, Kerosene, JP-8, Diesel #1, Diesel #2, Jet A. The main differences are the amount of filtering, The amount of wax, and the amount of Water that is present in the fuel. Military JP-4 was about the only unique fuel because it was a mix of Kerosene and avgas. It has since been replaced by JP-8 since it was a very sparky mix.
Interestly enough when the US Navy first put jet fighters on Carriers they where really worried about having to stock two types of fuel onboard the ships (Av-gas and Jet-Fuel) then somebody found out you could make a pretty decent jet fuel by thining the Bunker C fuel that powered the ships boilers with the Av-gas that the Corsiar and Skyraider ground attack aircraft needed.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.